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4ee4c7b948
wxWidgets/samples/drawing/drawing.cpp
Vadim Zeitlin 4ee4c7b948 Add support for gradient stops to wxGraphicsContext. 
Allow specifying a set of gradient stops instead of just the beginning and
ending colours. Add the new wxGraphicsGradientStop(s) classes and new
wxGraphicsContext::Create{Linear,Radial}GradientBrush() overloads. Also change
the same methods of wxGraphicsRenderer to take wxGraphicsGradientStops instead
of a pair of colours.

Implement the new API for MSW and Cairo. OS X still uses just the two colours
for now.

Closes #11897.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63857 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2010-04-05 12:15:11 +00:00

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/////////////////////////////////////////////////////////////////////////////
// Name: samples/drawing/drawing.cpp
// Purpose: shows and tests wxDC features
// Author: Robert Roebling
// Modified by:
// Created: 04/01/98
// RCS-ID: $Id$
// Copyright: (c) Robert Roebling
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
// ============================================================================
// declarations
// ============================================================================
// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
// for all others, include the necessary headers (this file is usually all you
// need because it includes almost all "standard" wxWidgets headers
#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif
#include "wx/colordlg.h"
#include "wx/image.h"
#include "wx/artprov.h"
#include "wx/dcgraph.h"
#include "wx/overlay.h"
#include "wx/graphics.h"
#include "wx/filename.h"
#define TEST_CAIRO_EVERYWHERE 0
// ----------------------------------------------------------------------------
// resources
// ----------------------------------------------------------------------------
// the application icon
#if defined(__WXGTK__) || defined(__WXMOTIF__) || defined(__WXMAC__) || defined(__WXMGL__) || defined(__WXX11__)
#include "mondrian.xpm"
#endif
// ----------------------------------------------------------------------------
// global variables
// ----------------------------------------------------------------------------
static wxBitmap *gs_bmpNoMask = NULL,
*gs_bmpWithColMask = NULL,
*gs_bmpMask = NULL,
*gs_bmpWithMask = NULL,
*gs_bmp4 = NULL,
*gs_bmp4_mono = NULL,
*gs_bmp36 = NULL;
// ----------------------------------------------------------------------------
// private classes
// ----------------------------------------------------------------------------
// Define a new application type, each program should derive a class from wxApp
class MyApp : public wxApp
{
public:
// override base class virtuals
// ----------------------------
// this one is called on application startup and is a good place for the app
// initialization (doing it here and not in the ctor allows to have an error
// return: if OnInit() returns false, the application terminates)
virtual bool OnInit();
virtual int OnExit() { DeleteBitmaps(); return 0; }
protected:
void DeleteBitmaps();
bool LoadImages();
};
class MyCanvas;
// Define a new frame type: this is going to be our main frame
class MyFrame : public wxFrame
{
public:
// ctor(s)
MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
// event handlers (these functions should _not_ be virtual)
void OnQuit(wxCommandEvent& event);
void OnAbout(wxCommandEvent& event);
void OnClip(wxCommandEvent& event);
#if wxUSE_GRAPHICS_CONTEXT
void OnGraphicContext(wxCommandEvent& event);
#endif
void OnShow(wxCommandEvent &event);
void OnOption(wxCommandEvent &event);
#if wxUSE_COLOURDLG
wxColour SelectColour();
#endif // wxUSE_COLOURDLG
void PrepareDC(wxDC& dc);
int m_backgroundMode;
int m_textureBackground;
wxMappingMode m_mapMode;
double m_xUserScale;
double m_yUserScale;
int m_xLogicalOrigin;
int m_yLogicalOrigin;
bool m_xAxisReversed,
m_yAxisReversed;
wxColour m_colourForeground, // these are _text_ colours
m_colourBackground;
wxBrush m_backgroundBrush;
MyCanvas *m_canvas;
private:
// any class wishing to process wxWidgets events must use this macro
DECLARE_EVENT_TABLE()
};
// define a scrollable canvas for drawing onto
class MyCanvas: public wxScrolledWindow
{
public:
MyCanvas( MyFrame *parent );
void OnPaint(wxPaintEvent &event);
void OnMouseMove(wxMouseEvent &event);
void OnMouseDown(wxMouseEvent &event);
void OnMouseUp(wxMouseEvent &event);
void ToShow(int show) { m_show = show; Refresh(); }
// set or remove the clipping region
void Clip(bool clip) { m_clip = clip; Refresh(); }
#if wxUSE_GRAPHICS_CONTEXT
void UseGraphicContext(bool use) { m_useContext = use; Refresh(); }
#endif
protected:
enum DrawMode
{
Draw_Normal,
Draw_Stretch
};
void DrawTestLines( int x, int y, int width, wxDC &dc );
void DrawTestPoly(wxDC& dc);
void DrawTestBrushes(wxDC& dc);
void DrawText(wxDC& dc);
void DrawImages(wxDC& dc, DrawMode mode);
void DrawWithLogicalOps(wxDC& dc);
#if wxUSE_GRAPHICS_CONTEXT
void DrawAlpha(wxDC& dc);
void DrawGraphics(wxGraphicsContext* gc);
#endif
void DrawRegions(wxDC& dc);
void DrawCircles(wxDC& dc);
void DrawSplines(wxDC& dc);
void DrawDefault(wxDC& dc);
void DrawGradients(wxDC& dc);
void DrawRegionsHelper(wxDC& dc, wxCoord x, bool firstTime);
private:
MyFrame *m_owner;
int m_show;
wxBitmap m_smile_bmp;
wxIcon m_std_icon;
bool m_clip;
wxOverlay m_overlay;
bool m_rubberBand;
wxPoint m_anchorpoint;
wxPoint m_currentpoint;
#if wxUSE_GRAPHICS_CONTEXT
bool m_useContext ;
#endif
DECLARE_EVENT_TABLE()
};
// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------
// IDs for the controls and the menu commands
enum
{
// menu items
File_Quit = wxID_EXIT,
File_About = wxID_ABOUT,
MenuShow_First = wxID_HIGHEST,
File_ShowDefault = MenuShow_First,
File_ShowText,
File_ShowLines,
File_ShowBrushes,
File_ShowPolygons,
File_ShowMask,
File_ShowMaskStretch,
File_ShowOps,
File_ShowRegions,
File_ShowCircles,
File_ShowSplines,
#if wxUSE_GRAPHICS_CONTEXT
File_ShowAlpha,
File_ShowGraphics,
#endif
File_ShowGradients,
MenuShow_Last = File_ShowGradients,
File_Clip,
#if wxUSE_GRAPHICS_CONTEXT
File_GraphicContext,
#endif
MenuOption_First,
MapMode_Text = MenuOption_First,
MapMode_Lometric,
MapMode_Twips,
MapMode_Points,
MapMode_Metric,
UserScale_StretchHoriz,
UserScale_ShrinkHoriz,
UserScale_StretchVertic,
UserScale_ShrinkVertic,
UserScale_Restore,
AxisMirror_Horiz,
AxisMirror_Vertic,
LogicalOrigin_MoveDown,
LogicalOrigin_MoveUp,
LogicalOrigin_MoveLeft,
LogicalOrigin_MoveRight,
LogicalOrigin_Set,
LogicalOrigin_Restore,
#if wxUSE_COLOURDLG
Colour_TextForeground,
Colour_TextBackground,
Colour_Background,
#endif // wxUSE_COLOURDLG
Colour_BackgroundMode,
Colour_TextureBackgound,
MenuOption_Last = Colour_TextureBackgound
};
// ----------------------------------------------------------------------------
// event tables and other macros for wxWidgets
// ----------------------------------------------------------------------------
// Create a new application object: this macro will allow wxWidgets to create
// the application object during program execution (it's better than using a
// static object for many reasons) and also declares the accessor function
// wxGetApp() which will return the reference of the right type (i.e. MyApp and
// not wxApp)
IMPLEMENT_APP(MyApp)
// ============================================================================
// implementation
// ============================================================================
// ----------------------------------------------------------------------------
// the application class
// ----------------------------------------------------------------------------
bool MyApp::LoadImages()
{
gs_bmpNoMask = new wxBitmap;
gs_bmpWithColMask = new wxBitmap;
gs_bmpMask = new wxBitmap;
gs_bmpWithMask = new wxBitmap;
gs_bmp4 = new wxBitmap;
gs_bmp4_mono = new wxBitmap;
gs_bmp36 = new wxBitmap;
wxPathList pathList;
// special hack for Unix in-tree sample build, don't do this in real
// programs, use wxStandardPaths instead
pathList.Add(wxFileName(argv[0]).GetPath());
pathList.Add(wxT("."));
pathList.Add(wxT(".."));
pathList.Add(wxT("../.."));
wxString path = pathList.FindValidPath(wxT("pat4.bmp"));
if ( !path )
return false;
/* 4 colour bitmap */
gs_bmp4->LoadFile(path, wxBITMAP_TYPE_BMP);
/* turn into mono-bitmap */
gs_bmp4_mono->LoadFile(path, wxBITMAP_TYPE_BMP);
wxMask* mask4 = new wxMask(*gs_bmp4_mono, *wxBLACK);
gs_bmp4_mono->SetMask(mask4);
path = pathList.FindValidPath(wxT("pat36.bmp"));
if ( !path )
return false;
gs_bmp36->LoadFile(path, wxBITMAP_TYPE_BMP);
wxMask* mask36 = new wxMask(*gs_bmp36, *wxBLACK);
gs_bmp36->SetMask(mask36);
path = pathList.FindValidPath(wxT("image.bmp"));
if ( !path )
return false;
gs_bmpNoMask->LoadFile(path, wxBITMAP_TYPE_BMP);
gs_bmpWithMask->LoadFile(path, wxBITMAP_TYPE_BMP);
gs_bmpWithColMask->LoadFile(path, wxBITMAP_TYPE_BMP);
path = pathList.FindValidPath(wxT("mask.bmp"));
if ( !path )
return false;
gs_bmpMask->LoadFile(path, wxBITMAP_TYPE_BMP);
wxMask *mask = new wxMask(*gs_bmpMask, *wxBLACK);
gs_bmpWithMask->SetMask(mask);
mask = new wxMask(*gs_bmpWithColMask, *wxWHITE);
gs_bmpWithColMask->SetMask(mask);
return true;
}
// `Main program' equivalent: the program execution "starts" here
bool MyApp::OnInit()
{
if ( !wxApp::OnInit() )
return false;
// Create the main application window
MyFrame *frame = new MyFrame(wxT("Drawing sample"),
wxPoint(50, 50), wxSize(550, 340));
// Show it and tell the application that it's our main window
frame->Show(true);
SetTopWindow(frame);
if ( !LoadImages() )
{
wxLogError(wxT("Can't load one of the bitmap files needed ")
wxT("for this sample from the current or parent ")
wxT("directory, please copy them there."));
// still continue, the sample can be used without images too if they're
// missing for whatever reason
}
return true;
}
void MyApp::DeleteBitmaps()
{
delete gs_bmpNoMask;
delete gs_bmpWithColMask;
delete gs_bmpMask;
delete gs_bmpWithMask;
delete gs_bmp4;
delete gs_bmp4_mono;
delete gs_bmp36;
gs_bmpNoMask = NULL;
gs_bmpWithColMask = NULL;
gs_bmpMask = NULL;
gs_bmpWithMask = NULL;
gs_bmp4 = NULL;
gs_bmp4_mono = NULL;
gs_bmp36 = NULL;
}
// ----------------------------------------------------------------------------
// MyCanvas
// ----------------------------------------------------------------------------
// the event tables connect the wxWidgets events with the functions (event
// handlers) which process them.
BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
EVT_PAINT (MyCanvas::OnPaint)
EVT_MOTION (MyCanvas::OnMouseMove)
EVT_LEFT_DOWN (MyCanvas::OnMouseDown)
EVT_LEFT_UP (MyCanvas::OnMouseUp)
END_EVENT_TABLE()
#include "smile.xpm"
MyCanvas::MyCanvas(MyFrame *parent)
: wxScrolledWindow(parent, wxID_ANY, wxDefaultPosition, wxDefaultSize,
wxHSCROLL | wxVSCROLL | wxNO_FULL_REPAINT_ON_RESIZE)
{
m_owner = parent;
m_show = File_ShowDefault;
m_smile_bmp = wxBitmap(smile_xpm);
m_std_icon = wxArtProvider::GetIcon(wxART_INFORMATION);
m_clip = false;
m_rubberBand = false;
#if wxUSE_GRAPHICS_CONTEXT
m_useContext = false;
#endif
}
void MyCanvas::DrawTestBrushes(wxDC& dc)
{
static const wxCoord WIDTH = 200;
static const wxCoord HEIGHT = 80;
wxCoord x = 10,
y = 10;
dc.SetBrush(wxBrush(*wxGREEN, wxSOLID));
dc.DrawRectangle(x, y, WIDTH, HEIGHT);
dc.DrawText(wxT("Solid green"), x + 10, y + 10);
y += HEIGHT;
dc.SetBrush(wxBrush(*wxRED, wxCROSSDIAG_HATCH));
dc.DrawRectangle(x, y, WIDTH, HEIGHT);
dc.DrawText(wxT("Hatched red"), x + 10, y + 10);
y += HEIGHT;
dc.SetBrush(wxBrush(*gs_bmpMask));
dc.DrawRectangle(x, y, WIDTH, HEIGHT);
dc.DrawText(wxT("Stipple mono"), x + 10, y + 10);
y += HEIGHT;
dc.SetBrush(wxBrush(*gs_bmpNoMask));
dc.DrawRectangle(x, y, WIDTH, HEIGHT);
dc.DrawText(wxT("Stipple colour"), x + 10, y + 10);
}
void MyCanvas::DrawTestPoly(wxDC& dc)
{
wxBrush brushHatch(*wxRED, wxFDIAGONAL_HATCH);
dc.SetBrush(brushHatch);
wxPoint star[5];
star[0] = wxPoint(100, 60);
star[1] = wxPoint(60, 150);
star[2] = wxPoint(160, 100);
star[3] = wxPoint(40, 100);
star[4] = wxPoint(140, 150);
dc.DrawText(wxT("You should see two (irregular) stars below, the left one ")
wxT("hatched"), 10, 10);
dc.DrawText(wxT("except for the central region and the right ")
wxT("one entirely hatched"), 10, 30);
dc.DrawText(wxT("The third star only has a hatched outline"), 10, 50);
dc.DrawPolygon(WXSIZEOF(star), star, 0, 30);
dc.DrawPolygon(WXSIZEOF(star), star, 160, 30, wxWINDING_RULE);
wxPoint star2[10];
star2[0] = wxPoint(0, 100);
star2[1] = wxPoint(-59, -81);
star2[2] = wxPoint(95, 31);
star2[3] = wxPoint(-95, 31);
star2[4] = wxPoint(59, -81);
star2[5] = wxPoint(0, 80);
star2[6] = wxPoint(-47, -64);
star2[7] = wxPoint(76, 24);
star2[8] = wxPoint(-76, 24);
star2[9] = wxPoint(47, -64);
int count[2] = {5, 5};
dc.DrawPolyPolygon(WXSIZEOF(count), count, star2, 450, 150);
}
void MyCanvas::DrawTestLines( int x, int y, int width, wxDC &dc )
{
dc.SetPen( wxPen( wxT("black"), width, wxSOLID) );
dc.SetBrush( *wxRED_BRUSH );
dc.DrawText(wxString::Format(wxT("Testing lines of width %d"), width), x + 10, y - 10);
dc.DrawRectangle( x+10, y+10, 100, 190 );
dc.DrawText(wxT("Solid/dot/short dash/long dash/dot dash"), x + 150, y + 10);
dc.SetPen( wxPen( wxT("black"), width, wxSOLID) );
dc.DrawLine( x+20, y+20, 100, y+20 );
dc.SetPen( wxPen( wxT("black"), width, wxDOT) );
dc.DrawLine( x+20, y+30, 100, y+30 );
dc.SetPen( wxPen( wxT("black"), width, wxSHORT_DASH) );
dc.DrawLine( x+20, y+40, 100, y+40 );
dc.SetPen( wxPen( wxT("black"), width, wxLONG_DASH) );
dc.DrawLine( x+20, y+50, 100, y+50 );
dc.SetPen( wxPen( wxT("black"), width, wxDOT_DASH) );
dc.DrawLine( x+20, y+60, 100, y+60 );
dc.DrawText(wxT("Misc hatches"), x + 150, y + 70);
dc.SetPen( wxPen( wxT("black"), width, wxBDIAGONAL_HATCH) );
dc.DrawLine( x+20, y+70, 100, y+70 );
dc.SetPen( wxPen( wxT("black"), width, wxCROSSDIAG_HATCH) );
dc.DrawLine( x+20, y+80, 100, y+80 );
dc.SetPen( wxPen( wxT("black"), width, wxFDIAGONAL_HATCH) );
dc.DrawLine( x+20, y+90, 100, y+90 );
dc.SetPen( wxPen( wxT("black"), width, wxCROSS_HATCH) );
dc.DrawLine( x+20, y+100, 100, y+100 );
dc.SetPen( wxPen( wxT("black"), width, wxHORIZONTAL_HATCH) );
dc.DrawLine( x+20, y+110, 100, y+110 );
dc.SetPen( wxPen( wxT("black"), width, wxVERTICAL_HATCH) );
dc.DrawLine( x+20, y+120, 100, y+120 );
dc.DrawText(wxT("User dash"), x + 150, y + 140);
wxPen ud( wxT("black"), width, wxUSER_DASH );
wxDash dash1[6];
dash1[0] = 8; // Long dash <---------+
dash1[1] = 2; // Short gap |
dash1[2] = 3; // Short dash |
dash1[3] = 2; // Short gap |
dash1[4] = 3; // Short dash |
dash1[5] = 2; // Short gap and repeat +
ud.SetDashes( 6, dash1 );
dc.SetPen( ud );
dc.DrawLine( x+20, y+140, 100, y+140 );
dash1[0] = 5; // Make first dash shorter
ud.SetDashes( 6, dash1 );
dc.SetPen( ud );
dc.DrawLine( x+20, y+150, 100, y+150 );
dash1[2] = 5; // Make second dash longer
ud.SetDashes( 6, dash1 );
dc.SetPen( ud );
dc.DrawLine( x+20, y+160, 100, y+160 );
dash1[4] = 5; // Make third dash longer
ud.SetDashes( 6, dash1 );
dc.SetPen( ud );
dc.DrawLine( x+20, y+170, 100, y+170 );
}
void MyCanvas::DrawDefault(wxDC& dc)
{
// mark the origin
dc.DrawCircle(0, 0, 10);
#if !defined(wxMAC_USE_CORE_GRAPHICS) || !wxMAC_USE_CORE_GRAPHICS
// GetPixel and FloodFill not supported by Mac OS X CoreGraphics
// (FloodFill uses Blit from a non-wxMemoryDC)
//flood fill using brush, starting at 1,1 and replacing whatever colour we find there
dc.SetBrush(wxBrush(wxColour(128,128,0), wxSOLID));
wxColour tmpColour ;
dc.GetPixel(1,1, &tmpColour);
dc.FloodFill(1,1, tmpColour, wxFLOOD_SURFACE);
#endif
dc.DrawCheckMark(5, 80, 15, 15);
dc.DrawCheckMark(25, 80, 30, 30);
dc.DrawCheckMark(60, 80, 60, 60);
// this is the test for "blitting bitmap into DC damages selected brush" bug
wxCoord rectSize = m_std_icon.GetWidth() + 10;
wxCoord x = 100;
dc.SetPen(*wxTRANSPARENT_PEN);
dc.SetBrush( *wxGREEN_BRUSH );
dc.DrawRectangle(x, 10, rectSize, rectSize);
dc.DrawBitmap(m_std_icon, x + 5, 15, true);
x += rectSize + 10;
dc.DrawRectangle(x, 10, rectSize, rectSize);
dc.DrawIcon(m_std_icon, x + 5, 15);
x += rectSize + 10;
dc.DrawRectangle(x, 10, rectSize, rectSize);
// test for "transparent" bitmap drawing (it intersects with the last
// rectangle above)
//dc.SetBrush( *wxTRANSPARENT_BRUSH );
if (m_smile_bmp.Ok())
dc.DrawBitmap(m_smile_bmp, x + rectSize - 20, rectSize - 10, true);
dc.SetBrush( *wxBLACK_BRUSH );
dc.DrawRectangle( 0, 160, 1000, 300 );
// draw lines
wxBitmap bitmap(20,70);
wxMemoryDC memdc;
memdc.SelectObject( bitmap );
memdc.SetBrush( *wxBLACK_BRUSH );
memdc.SetPen( *wxWHITE_PEN );
memdc.DrawRectangle(0,0,20,70);
memdc.DrawLine( 10,0,10,70 );
// to the right
wxPen pen = *wxRED_PEN;
memdc.SetPen(pen);
memdc.DrawLine( 10, 5,10, 5 );
memdc.DrawLine( 10,10,11,10 );
memdc.DrawLine( 10,15,12,15 );
memdc.DrawLine( 10,20,13,20 );
/*
memdc.SetPen(*wxRED_PEN);
memdc.DrawLine( 12, 5,12, 5 );
memdc.DrawLine( 12,10,13,10 );
memdc.DrawLine( 12,15,14,15 );
memdc.DrawLine( 12,20,15,20 );
*/
// same to the left
memdc.DrawLine( 10,25,10,25 );
memdc.DrawLine( 10,30, 9,30 );
memdc.DrawLine( 10,35, 8,35 );
memdc.DrawLine( 10,40, 7,40 );
// XOR draw lines
dc.SetPen(*wxWHITE_PEN);
memdc.SetLogicalFunction( wxINVERT );
memdc.SetPen( *wxWHITE_PEN );
memdc.DrawLine( 10,50,10,50 );
memdc.DrawLine( 10,55,11,55 );
memdc.DrawLine( 10,60,12,60 );
memdc.DrawLine( 10,65,13,65 );
memdc.DrawLine( 12,50,12,50 );
memdc.DrawLine( 12,55,13,55 );
memdc.DrawLine( 12,60,14,60 );
memdc.DrawLine( 12,65,15,65 );
memdc.SelectObject( wxNullBitmap );
dc.DrawBitmap( bitmap, 10, 170 );
wxImage image = bitmap.ConvertToImage();
image.Rescale( 60,210 );
bitmap = wxBitmap(image);
dc.DrawBitmap( bitmap, 50, 170 );
// test the rectangle outline drawing - there should be one pixel between
// the rect and the lines
dc.SetPen(*wxWHITE_PEN);
dc.SetBrush( *wxTRANSPARENT_BRUSH );
dc.DrawRectangle(150, 170, 49, 29);
dc.DrawRectangle(200, 170, 49, 29);
dc.SetPen(*wxWHITE_PEN);
dc.DrawLine(250, 210, 250, 170);
dc.DrawLine(260, 200, 150, 200);
// test the rectangle filled drawing - there should be one pixel between
// the rect and the lines
dc.SetPen(*wxTRANSPARENT_PEN);
dc.SetBrush( *wxWHITE_BRUSH );
dc.DrawRectangle(300, 170, 49, 29);
dc.DrawRectangle(350, 170, 49, 29);
dc.SetPen(*wxWHITE_PEN);
dc.DrawLine(400, 170, 400, 210);
dc.DrawLine(300, 200, 410, 200);
// a few more tests of this kind
dc.SetPen(*wxRED_PEN);
dc.SetBrush( *wxWHITE_BRUSH );
dc.DrawRectangle(300, 220, 1, 1);
dc.DrawRectangle(310, 220, 2, 2);
dc.DrawRectangle(320, 220, 3, 3);
dc.DrawRectangle(330, 220, 4, 4);
dc.SetPen(*wxTRANSPARENT_PEN);
dc.SetBrush( *wxWHITE_BRUSH );
dc.DrawRectangle(300, 230, 1, 1);
dc.DrawRectangle(310, 230, 2, 2);
dc.DrawRectangle(320, 230, 3, 3);
dc.DrawRectangle(330, 230, 4, 4);
// and now for filled rect with outline
dc.SetPen(*wxRED_PEN);
dc.SetBrush( *wxWHITE_BRUSH );
dc.DrawRectangle(500, 170, 49, 29);
dc.DrawRectangle(550, 170, 49, 29);
dc.SetPen(*wxWHITE_PEN);
dc.DrawLine(600, 170, 600, 210);
dc.DrawLine(500, 200, 610, 200);
// test the rectangle outline drawing - there should be one pixel between
// the rect and the lines
dc.SetPen(*wxWHITE_PEN);
dc.SetBrush( *wxTRANSPARENT_BRUSH );
dc.DrawRoundedRectangle(150, 270, 49, 29, 6);
dc.DrawRoundedRectangle(200, 270, 49, 29, 6);
dc.SetPen(*wxWHITE_PEN);
dc.DrawLine(250, 270, 250, 310);
dc.DrawLine(150, 300, 260, 300);
// test the rectangle filled drawing - there should be one pixel between
// the rect and the lines
dc.SetPen(*wxTRANSPARENT_PEN);
dc.SetBrush( *wxWHITE_BRUSH );
dc.DrawRoundedRectangle(300, 270, 49, 29, 6);
dc.DrawRoundedRectangle(350, 270, 49, 29, 6);
dc.SetPen(*wxWHITE_PEN);
dc.DrawLine(400, 270, 400, 310);
dc.DrawLine(300, 300, 410, 300);
// Added by JACS to demonstrate bizarre behaviour.
// With a size of 70, we get a missing red RHS,
// and the height is too small, so we get yellow
// showing. With a size of 40, it draws as expected:
// it just shows a white rectangle with red outline.
int totalWidth = 70;
int totalHeight = 70;
wxBitmap bitmap2(totalWidth, totalHeight);
wxMemoryDC memdc2;
memdc2.SelectObject(bitmap2);
wxColour clr(255, 255, 0);
wxBrush yellowBrush(clr, wxSOLID);
memdc2.SetBackground(yellowBrush);
memdc2.Clear();
wxPen yellowPen(clr, 1, wxSOLID);
// Now draw a white rectangle with red outline. It should
// entirely eclipse the yellow background.
memdc2.SetPen(*wxRED_PEN);
memdc2.SetBrush(*wxWHITE_BRUSH);
memdc2.DrawRectangle(0, 0, totalWidth, totalHeight);
memdc2.SetPen(wxNullPen);
memdc2.SetBrush(wxNullBrush);
memdc2.SelectObject(wxNullBitmap);
dc.DrawBitmap(bitmap2, 500, 270);
// Repeat, but draw directly on dc
// Draw a yellow rectangle filling the bitmap
x = 600; int y = 270;
dc.SetPen(yellowPen);
dc.SetBrush(yellowBrush);
dc.DrawRectangle(x, y, totalWidth, totalHeight);
// Now draw a white rectangle with red outline. It should
// entirely eclipse the yellow background.
dc.SetPen(*wxRED_PEN);
dc.SetBrush(*wxWHITE_BRUSH);
dc.DrawRectangle(x, y, totalWidth, totalHeight);
}
void MyCanvas::DrawText(wxDC& dc)
{
// set underlined font for testing
dc.SetFont( wxFont(12, wxMODERN, wxNORMAL, wxNORMAL, true) );
dc.DrawText( wxT("This is text"), 110, 10 );
dc.DrawRotatedText( wxT("That is text"), 20, 10, -45 );
// use wxSWISS_FONT and not wxNORMAL_FONT as the latter can't be rotated
// under Win9x (it is not TrueType)
dc.SetFont( *wxSWISS_FONT );
wxString text;
dc.SetBackgroundMode(wxTRANSPARENT);
for ( int n = -180; n < 180; n += 30 )
{
text.Printf(wxT(" %d rotated text"), n);
dc.DrawRotatedText(text , 400, 400, n);
}
dc.SetFont( wxFont( 18, wxSWISS, wxNORMAL, wxNORMAL ) );
dc.DrawText( wxT("This is Swiss 18pt text."), 110, 40 );
wxCoord length;
wxCoord height;
wxCoord descent;
dc.GetTextExtent( wxT("This is Swiss 18pt text."), &length, &height, &descent );
text.Printf( wxT("Dimensions are length %ld, height %ld, descent %ld"), length, height, descent );
dc.DrawText( text, 110, 80 );
text.Printf( wxT("CharHeight() returns: %d"), dc.GetCharHeight() );
dc.DrawText( text, 110, 120 );
dc.DrawRectangle( 100, 40, 4, height );
// test the logical function effect
wxCoord y = 150;
dc.SetLogicalFunction(wxINVERT);
// text drawing should ignore logical function
dc.DrawText( wxT("There should be a text below"), 110, 150 );
dc.DrawRectangle( 110, y, 100, height );
y += height;
dc.DrawText( wxT("Visible text"), 110, y );
dc.DrawRectangle( 110, y, 100, height );
dc.DrawText( wxT("Visible text"), 110, y );
dc.DrawRectangle( 110, y, 100, height );
dc.SetLogicalFunction(wxCOPY);
y += height;
dc.DrawRectangle( 110, y, 100, height );
dc.DrawText( wxT("Another visible text"), 110, y );
}
static const struct
{
const wxChar *name;
wxRasterOperationMode rop;
} rasterOperations[] =
{
{ wxT("wxAND"), wxAND },
{ wxT("wxAND_INVERT"), wxAND_INVERT },
{ wxT("wxAND_REVERSE"), wxAND_REVERSE },
{ wxT("wxCLEAR"), wxCLEAR },
{ wxT("wxCOPY"), wxCOPY },
{ wxT("wxEQUIV"), wxEQUIV },
{ wxT("wxINVERT"), wxINVERT },
{ wxT("wxNAND"), wxNAND },
{ wxT("wxNO_OP"), wxNO_OP },
{ wxT("wxOR"), wxOR },
{ wxT("wxOR_INVERT"), wxOR_INVERT },
{ wxT("wxOR_REVERSE"), wxOR_REVERSE },
{ wxT("wxSET"), wxSET },
{ wxT("wxSRC_INVERT"), wxSRC_INVERT },
{ wxT("wxXOR"), wxXOR },
};
void MyCanvas::DrawImages(wxDC& dc, DrawMode mode)
{
dc.DrawText(wxT("original image"), 0, 0);
dc.DrawBitmap(*gs_bmpNoMask, 0, 20, 0);
dc.DrawText(wxT("with colour mask"), 0, 100);
dc.DrawBitmap(*gs_bmpWithColMask, 0, 120, true);
dc.DrawText(wxT("the mask image"), 0, 200);
dc.DrawBitmap(*gs_bmpMask, 0, 220, 0);
dc.DrawText(wxT("masked image"), 0, 300);
dc.DrawBitmap(*gs_bmpWithMask, 0, 320, true);
int cx = gs_bmpWithColMask->GetWidth(),
cy = gs_bmpWithColMask->GetHeight();
wxMemoryDC memDC;
for ( size_t n = 0; n < WXSIZEOF(rasterOperations); n++ )
{
wxCoord x = 120 + 150*(n%4),
y = 20 + 100*(n/4);
dc.DrawText(rasterOperations[n].name, x, y - 20);
memDC.SelectObject(*gs_bmpWithColMask);
if ( mode == Draw_Stretch )
{
dc.StretchBlit(x, y, cx, cy, &memDC, 0, 0, cx/2, cy/2,
rasterOperations[n].rop, true);
}
else
{
dc.Blit(x, y, cx, cy, &memDC, 0, 0, rasterOperations[n].rop, true);
}
}
}
void MyCanvas::DrawWithLogicalOps(wxDC& dc)
{
static const wxCoord w = 60;
static const wxCoord h = 60;
// reuse the text colour here
dc.SetPen(wxPen(m_owner->m_colourForeground, 1, wxSOLID));
dc.SetBrush(*wxTRANSPARENT_BRUSH);
size_t n;
for ( n = 0; n < WXSIZEOF(rasterOperations); n++ )
{
wxCoord x = 20 + 150*(n%4),
y = 20 + 100*(n/4);
dc.DrawText(rasterOperations[n].name, x, y - 20);
dc.SetLogicalFunction(rasterOperations[n].rop);
dc.DrawRectangle(x, y, w, h);
dc.DrawLine(x, y, x + w, y + h);
dc.DrawLine(x + w, y, x, y + h);
}
// now some filled rectangles
dc.SetBrush(wxBrush(m_owner->m_colourForeground, wxSOLID));
for ( n = 0; n < WXSIZEOF(rasterOperations); n++ )
{
wxCoord x = 20 + 150*(n%4),
y = 500 + 100*(n/4);
dc.DrawText(rasterOperations[n].name, x, y - 20);
dc.SetLogicalFunction(rasterOperations[n].rop);
dc.DrawRectangle(x, y, w, h);
}
}
#if wxUSE_GRAPHICS_CONTEXT
#ifdef __WXGTK20__
void MyCanvas::DrawAlpha(wxDC& WXUNUSED(dummyDC))
#else
void MyCanvas::DrawAlpha(wxDC& dc)
#endif
{
#ifdef __WXGTK__
wxGCDC dc( this );
PrepareDC( dc );
#endif
wxDouble margin = 20 ;
wxDouble width = 180 ;
wxDouble radius = 30 ;
dc.SetPen( wxPen( wxColour( 128, 0, 0, 255 ),12, wxSOLID));
dc.SetBrush( wxBrush( wxColour( 255, 0, 0, 255),wxSOLID));
wxRect r(margin,margin+width*0.66,width,width) ;
dc.DrawRoundedRectangle( r.x, r.y, r.width, r.width, radius ) ;
dc.SetPen( wxPen( wxColour( 0, 0, 128, 255 ),12, wxSOLID));
dc.SetBrush( wxBrush( wxColour( 0, 0, 255, 255),wxSOLID));
r.Offset( width * 0.8 , - width * 0.66 ) ;
dc.DrawRoundedRectangle( r.x, r.y, r.width, r.width, radius ) ;
dc.SetPen( wxPen( wxColour( 128, 128, 0, 255 ),12, wxSOLID));
dc.SetBrush( wxBrush( wxColour( 192, 192, 0, 255),wxSOLID));
r.Offset( width * 0.8 , width *0.5 ) ;
dc.DrawRoundedRectangle( r.x, r.y, r.width, r.width, radius ) ;
dc.SetPen( *wxTRANSPARENT_PEN ) ;
dc.SetBrush( wxBrush( wxColour(255,255,128,128) ) );
dc.DrawRoundedRectangle( 0 , margin + width / 2 , width * 3 , 100 , radius) ;
dc.SetTextForeground( wxColour(255,255,0,128) );
dc.SetFont( wxFont( 40, wxFONTFAMILY_SWISS, wxFONTSTYLE_ITALIC, wxFONTWEIGHT_NORMAL ) );
dc.DrawText( wxT("Hello!"), 120, 80 );
}
#endif
#if wxUSE_GRAPHICS_CONTEXT
const int BASE = 80.0;
const int BASE2 = BASE/2;
const int BASE4 = BASE/4;
static inline double DegToRad(double deg) { return (deg * M_PI) / 180.0; }
// modeled along Robin Dunn's GraphicsContext.py sample
void MyCanvas::DrawGraphics(wxGraphicsContext* gc)
{
wxFont font = wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT);
gc->SetFont(font,*wxBLACK);
// make a path that contains a circle and some lines, centered at 0,0
wxGraphicsPath path = gc->CreatePath() ;
path.AddCircle( 0, 0, BASE2 );
path.MoveToPoint(0, -BASE2);
path.AddLineToPoint(0, BASE2);
path.MoveToPoint(-BASE2, 0);
path.AddLineToPoint(BASE2, 0);
path.CloseSubpath();
path.AddRectangle(-BASE4, -BASE4/2, BASE2, BASE4);
// Now use that path to demonstrate various capbilites of the grpahics context
gc->PushState(); // save current translation/scale/other state
gc->Translate(60, 75); // reposition the context origin
gc->SetPen(wxPen("navy", 1));
gc->SetBrush(wxBrush("pink"));
for( int i = 0 ; i < 3 ; ++i )
{
wxString label;
switch( i )
{
case 0 :
label = "StrokePath";
break;
case 1 :
label = "FillPath";
break;
case 2 :
label = "DrawPath";
break;
}
wxDouble w, h;
gc->GetTextExtent(label, &w, &h, NULL, NULL);
gc->DrawText(label, -w/2, -BASE2-h-4);
switch( i )
{
case 0 :
gc->StrokePath(path);
break;
case 1 :
gc->FillPath(path);
break;
case 2 :
gc->DrawPath(path);
break;
}
gc->Translate(2*BASE, 0);
}
gc->PopState(); // restore saved state
gc->PushState(); // save it again
gc->Translate(60, 200); // offset to the lower part of the window
gc->DrawText("Scale", 0, -BASE2);
gc->Translate(0, 20);
gc->SetBrush(wxBrush(wxColour(178, 34, 34, 128)));// 128 == half transparent
for( int i = 0 ; i < 8 ; ++i )
{
gc->Scale(1.08, 1.08); // increase scale by 8%
gc->Translate(5,5);
gc->DrawPath(path);
}
gc->PopState(); // restore saved state
gc->PushState(); // save it again
gc->Translate(400, 200);
gc->DrawText("Rotate", 0, -BASE2);
// Move the origin over to the next location
gc->Translate(0, 75);
// draw our path again, rotating it about the central point,
// and changing colors as we go
for ( int angle = 0 ; angle < 360 ; angle += 30 )
{
gc->PushState(); // save this new current state so we can
// pop back to it at the end of the loop
wxImage::RGBValue val = wxImage::HSVtoRGB(wxImage::HSVValue(float(angle)/360, 1, 1));
gc->SetBrush(wxBrush(wxColour(val.red, val.green, val.blue, 64)));
gc->SetPen(wxPen(wxColour(val.red, val.green, val.blue, 128)));
// use translate to artfully reposition each drawn path
gc->Translate(1.5 * BASE2 * cos(DegToRad(angle)),
1.5 * BASE2 * sin(DegToRad(angle)));
// use Rotate to rotate the path
gc->Rotate(DegToRad(angle));
// now draw it
gc->DrawPath(path);
gc->PopState();
}
gc->PopState();
}
#endif
void MyCanvas::DrawCircles(wxDC& dc)
{
int x = 100,
y = 100,
r = 20;
dc.SetPen( *wxRED_PEN );
dc.SetBrush( *wxGREEN_BRUSH );
dc.DrawText(wxT("Some circles"), 0, y);
dc.DrawCircle(x, y, r);
dc.DrawCircle(x + 2*r, y, r);
dc.DrawCircle(x + 4*r, y, r);
y += 2*r;
dc.DrawText(wxT("And ellipses"), 0, y);
dc.DrawEllipse(x - r, y, 2*r, r);
dc.DrawEllipse(x + r, y, 2*r, r);
dc.DrawEllipse(x + 3*r, y, 2*r, r);
y += 2*r;
dc.DrawText(wxT("And arcs"), 0, y);
dc.DrawArc(x - r, y, x + r, y, x, y);
dc.DrawArc(x + 4*r, y, x + 2*r, y, x + 3*r, y);
dc.DrawArc(x + 5*r, y, x + 5*r, y, x + 6*r, y);
y += 2*r;
dc.DrawEllipticArc(x - r, y, 2*r, r, 0, 90);
dc.DrawEllipticArc(x + r, y, 2*r, r, 90, 180);
dc.DrawEllipticArc(x + 3*r, y, 2*r, r, 180, 270);
dc.DrawEllipticArc(x + 5*r, y, 2*r, r, 270, 360);
// same as above, just transparent brush
dc.SetPen( *wxRED_PEN );
dc.SetBrush( *wxTRANSPARENT_BRUSH );
y += 2*r;
dc.DrawText(wxT("Some circles"), 0, y);
dc.DrawCircle(x, y, r);
dc.DrawCircle(x + 2*r, y, r);
dc.DrawCircle(x + 4*r, y, r);
y += 2*r;
dc.DrawText(wxT("And ellipses"), 0, y);
dc.DrawEllipse(x - r, y, 2*r, r);
dc.DrawEllipse(x + r, y, 2*r, r);
dc.DrawEllipse(x + 3*r, y, 2*r, r);
y += 2*r;
dc.DrawText(wxT("And arcs"), 0, y);
dc.DrawArc(x - r, y, x + r, y, x, y);
dc.DrawArc(x + 4*r, y, x + 2*r, y, x + 3*r, y);
dc.DrawArc(x + 5*r, y, x + 5*r, y, x + 6*r, y);
y += 2*r;
dc.DrawEllipticArc(x - r, y, 2*r, r, 0, 90);
dc.DrawEllipticArc(x + r, y, 2*r, r, 90, 180);
dc.DrawEllipticArc(x + 3*r, y, 2*r, r, 180, 270);
dc.DrawEllipticArc(x + 5*r, y, 2*r, r, 270, 360);
}
void MyCanvas::DrawSplines(wxDC& dc)
{
#if wxUSE_SPLINES
dc.DrawText(wxT("Some splines"), 10, 5);
// values are hardcoded rather than randomly generated
// so the output can be compared between native
// implementations on platforms with different random
// generators
const int R = 300;
const wxPoint center( R + 20, R + 20 );
const int angles[7] = { 0, 10, 33, 77, 13, 145, 90 };
const int radii[5] = { 100 , 59, 85, 33, 90 };
const int n = 200;
wxPoint pts[n];
// background spline calculation
unsigned int radius_pos = 0;
unsigned int angle_pos = 0;
int angle = 0;
for ( int i = 0; i < n; i++ )
{
angle += angles[ angle_pos ];
int r = R * radii[ radius_pos ] / 100;
pts[ i ].x = center.x + (wxCoord)( r * cos( M_PI * angle / 180.0) );
pts[ i ].y = center.y + (wxCoord)( r * sin( M_PI * angle / 180.0) );
angle_pos++;
if ( angle_pos >= WXSIZEOF(angles) ) angle_pos = 0;
radius_pos++;
if ( radius_pos >= WXSIZEOF(radii) ) radius_pos = 0;
}
// background spline drawing
dc.SetPen(*wxRED_PEN);
dc.DrawSpline(WXSIZEOF(pts), pts);
// less detailed spline calculation
wxPoint letters[4][5];
// w
letters[0][0] = wxPoint( 0,1); // O O
letters[0][1] = wxPoint( 1,3); // * *
letters[0][2] = wxPoint( 2,2); // * O *
letters[0][3] = wxPoint( 3,3); // * * * *
letters[0][4] = wxPoint( 4,1); // O O
// x1
letters[1][0] = wxPoint( 5,1); // O*O
letters[1][1] = wxPoint( 6,1); // *
letters[1][2] = wxPoint( 7,2); // O
letters[1][3] = wxPoint( 8,3); // *
letters[1][4] = wxPoint( 9,3); // O*O
// x2
letters[2][0] = wxPoint( 5,3); // O*O
letters[2][1] = wxPoint( 6,3); // *
letters[2][2] = wxPoint( 7,2); // O
letters[2][3] = wxPoint( 8,1); // *
letters[2][4] = wxPoint( 9,1); // O*O
// W
letters[3][0] = wxPoint(10,0); // O O
letters[3][1] = wxPoint(11,3); // * *
letters[3][2] = wxPoint(12,1); // * O *
letters[3][3] = wxPoint(13,3); // * * * *
letters[3][4] = wxPoint(14,0); // O O
const int dx = 2 * R / letters[3][4].x;
const int h[4] = { -R/2, 0, R/4, R/2 };
for ( int m = 0; m < 4; m++ )
{
for ( int n = 0; n < 5; n++ )
{
letters[m][n].x = center.x - R + letters[m][n].x * dx;
letters[m][n].y = center.y + h[ letters[m][n].y ];
}
dc.SetPen( wxPen( wxT("blue"), 1, wxDOT) );
dc.DrawLines(5, letters[m]);
dc.SetPen( wxPen( wxT("black"), 4, wxSOLID) );
dc.DrawSpline(5, letters[m]);
}
#else
dc.DrawText(wxT("Splines not supported."), 10, 5);
#endif
}
void MyCanvas::DrawGradients(wxDC& dc)
{
static const int TEXT_HEIGHT = 15;
// LHS: linear
wxRect r(10, 10, 50, 50);
dc.DrawText(wxT("wxRIGHT"), r.x, r.y);
r.Offset(0, TEXT_HEIGHT);
dc.GradientFillLinear(r, *wxWHITE, *wxBLUE, wxRIGHT);
r.Offset(0, r.height + 10);
dc.DrawText(wxT("wxLEFT"), r.x, r.y);
r.Offset(0, TEXT_HEIGHT);
dc.GradientFillLinear(r, *wxWHITE, *wxBLUE, wxLEFT);
r.Offset(0, r.height + 10);
dc.DrawText(wxT("wxDOWN"), r.x, r.y);
r.Offset(0, TEXT_HEIGHT);
dc.GradientFillLinear(r, *wxWHITE, *wxBLUE, wxDOWN);
r.Offset(0, r.height + 10);
dc.DrawText(wxT("wxUP"), r.x, r.y);
r.Offset(0, TEXT_HEIGHT);
dc.GradientFillLinear(r, *wxWHITE, *wxBLUE, wxUP);
wxRect gfr = wxRect(r);
// RHS: concentric
r = wxRect(200, 10, 50, 50);
dc.DrawText(wxT("Blue inside"), r.x, r.y);
r.Offset(0, TEXT_HEIGHT);
dc.GradientFillConcentric(r, *wxBLUE, *wxWHITE);
r.Offset(0, r.height + 10);
dc.DrawText(wxT("White inside"), r.x, r.y);
r.Offset(0, TEXT_HEIGHT);
dc.GradientFillConcentric(r, *wxWHITE, *wxBLUE);
r.Offset(0, r.height + 10);
dc.DrawText(wxT("Blue in top left corner"), r.x, r.y);
r.Offset(0, TEXT_HEIGHT);
dc.GradientFillConcentric(r, *wxBLUE, *wxWHITE, wxPoint(0, 0));
r.Offset(0, r.height + 10);
dc.DrawText(wxT("Blue in bottom right corner"), r.x, r.y);
r.Offset(0, TEXT_HEIGHT);
dc.GradientFillConcentric(r, *wxBLUE, *wxWHITE, wxPoint(r.width, r.height));
// check that the area filled by the gradient is exactly the interior of
// the rectangle
r.x = 350;
r.y = 30;
dc.DrawText("The interior should be filled but", r.x, r.y);
r.y += 15;
dc.DrawText(" the red border should remain visible:", r.x, r.y);
r.y += 15;
r.width =
r.height = 50;
wxRect r2 = r;
r2.x += 60;
wxRect r3 = r;
r3.y += 60;
wxRect r4 = r2;
r4.y += 60;
dc.SetPen(wxPen(wxColour(255, 0, 0)));
dc.DrawRectangle(r);
r.Deflate(1);
dc.GradientFillLinear(r, wxColour(0,255,0), wxColour(0,0,0), wxNORTH);
dc.DrawRectangle(r2);
r2.Deflate(1);
dc.GradientFillLinear(r2, wxColour(0,0,0), wxColour(0,255,0), wxSOUTH);
dc.DrawRectangle(r3);
r3.Deflate(1);
dc.GradientFillLinear(r3, wxColour(0,255,0), wxColour(0,0,0), wxEAST);
dc.DrawRectangle(r4);
r4.Deflate(1);
dc.GradientFillLinear(r4, wxColour(0,0,0), wxColour(0,255,0), wxWEST);
#if wxUSE_GRAPHICS_CONTEXT
if (m_useContext)
{
wxGCDC &gdc = (wxGCDC&)dc;
wxGraphicsContext *gc = gdc.GetGraphicsContext();
wxGraphicsPath pth;
wxGraphicsGradientStops stops;
gfr.Offset(0, gfr.height + 10);
dc.DrawText(wxT("Linear Gradient with Stops"), gfr.x, gfr.y);
gfr.Offset(0, TEXT_HEIGHT);
stops = wxGraphicsGradientStops(wxColour(255,0,0), wxColour(0,0,255));
stops.Add(wxColour(255,255,0), 0.33f);
stops.Add(wxColour(0,255,0), 0.67f);
gc->SetBrush(gc->CreateLinearGradientBrush(gfr.x, gfr.y,
gfr.x + gfr.width, gfr.y + gfr.height,
stops));
pth = gc->CreatePath();
pth.MoveToPoint(gfr.x,gfr.y);
pth.AddLineToPoint(gfr.x + gfr.width,gfr.y);
pth.AddLineToPoint(gfr.x + gfr.width,gfr.y+gfr.height);
pth.AddLineToPoint(gfr.x,gfr.y+gfr.height);
pth.CloseSubpath();
gc->FillPath(pth);
gfr.Offset(0, gfr.height + 10);
dc.DrawText(wxT("Radial Gradient with Stops"), gfr.x, gfr.y);
gfr.Offset(0, TEXT_HEIGHT);
gc->SetBrush(gc->CreateRadialGradientBrush(gfr.x + gfr.width / 2,
gfr.y + gfr.height / 2,
gfr.x + gfr.width / 2,
gfr.y + gfr.height / 2,
gfr.width / 2,
stops));
pth = gc->CreatePath();
pth.MoveToPoint(gfr.x,gfr.y);
pth.AddLineToPoint(gfr.x + gfr.width,gfr.y);
pth.AddLineToPoint(gfr.x + gfr.width,gfr.y+gfr.height);
pth.AddLineToPoint(gfr.x,gfr.y+gfr.height);
pth.CloseSubpath();
gc->FillPath(pth);
gfr.Offset(0, gfr.height + 10);
dc.DrawText(wxT("Linear Gradient with Stops and Gaps"), gfr.x, gfr.y);
gfr.Offset(0, TEXT_HEIGHT);
stops = wxGraphicsGradientStops(wxColour(255,0,0), wxColour(0,0,255));
stops.Add(wxColour(255,255,0), 0.33f);
stops.Add(wxTransparentColour, 0.33f);
stops.Add(wxTransparentColour, 0.67f);
stops.Add(wxColour(0,255,0), 0.67f);
gc->SetBrush(gc->CreateLinearGradientBrush(gfr.x, gfr.y + gfr.height,
gfr.x + gfr.width, gfr.y,
stops));
pth = gc->CreatePath();
pth.MoveToPoint(gfr.x,gfr.y);
pth.AddLineToPoint(gfr.x + gfr.width,gfr.y);
pth.AddLineToPoint(gfr.x + gfr.width,gfr.y+gfr.height);
pth.AddLineToPoint(gfr.x,gfr.y+gfr.height);
pth.CloseSubpath();
gc->FillPath(pth);
gfr.Offset(0, gfr.height + 10);
dc.DrawText(wxT("Radial Gradient with Stops and Gaps"), gfr.x, gfr.y);
gfr.Offset(0, TEXT_HEIGHT);
gc->SetBrush(gc->CreateRadialGradientBrush(gfr.x + gfr.width / 2,
gfr.y + gfr.height / 2,
gfr.x + gfr.width / 2,
gfr.y + gfr.height / 2,
gfr.width / 2,
stops));
pth = gc->CreatePath();
pth.MoveToPoint(gfr.x,gfr.y);
pth.AddLineToPoint(gfr.x + gfr.width,gfr.y);
pth.AddLineToPoint(gfr.x + gfr.width,gfr.y+gfr.height);
pth.AddLineToPoint(gfr.x,gfr.y+gfr.height);
pth.CloseSubpath();
gc->FillPath(pth);
gfr.Offset(0, gfr.height + 10);
dc.DrawText(wxT("Gradients with Stops and Transparency"), gfr.x, gfr.y);
gfr.Offset(0, TEXT_HEIGHT);
stops = wxGraphicsGradientStops(wxColour(255,0,0), wxTransparentColour);
stops.Add(wxColour(255,0,0), 0.33f);
stops.Add(wxTransparentColour, 0.33f);
stops.Add(wxTransparentColour, 0.67f);
stops.Add(wxColour(0,0,255), 0.67f);
stops.Add(wxColour(0,0,255), 1.0f);
pth = gc->CreatePath();
pth.MoveToPoint(gfr.x,gfr.y);
pth.AddLineToPoint(gfr.x + gfr.width,gfr.y);
pth.AddLineToPoint(gfr.x + gfr.width,gfr.y+gfr.height);
pth.AddLineToPoint(gfr.x,gfr.y+gfr.height);
pth.CloseSubpath();
gc->SetBrush(gc->CreateRadialGradientBrush(gfr.x + gfr.width / 2,
gfr.y + gfr.height / 2,
gfr.x + gfr.width / 2,
gfr.y + gfr.height / 2,
gfr.width / 2,
stops));
gc->FillPath(pth);
stops = wxGraphicsGradientStops(wxColour(255,0,0, 128), wxColour(0,0,255, 128));
stops.Add(wxColour(255,255,0,128), 0.33f);
stops.Add(wxColour(0,255,0,128), 0.67f);
gc->SetBrush(gc->CreateLinearGradientBrush(gfr.x, gfr.y,
gfr.x + gfr.width, gfr.y,
stops));
gc->FillPath(pth);
}
#endif // wxUSE_GRAPHICS_CONTEXT
}
void MyCanvas::DrawRegions(wxDC& dc)
{
dc.DrawText(wxT("You should see a red rect partly covered by a cyan one ")
wxT("on the left"), 10, 5);
dc.DrawText(wxT("and 5 smileys from which 4 are partially clipped on the right"),
10, 5 + dc.GetCharHeight());
dc.DrawText(wxT("The second copy should be identical but right part of it ")
wxT("should be offset by 10 pixels."),
10, 5 + 2*dc.GetCharHeight());
DrawRegionsHelper(dc, 10, true);
DrawRegionsHelper(dc, 350, false);
}
void MyCanvas::DrawRegionsHelper(wxDC& dc, wxCoord x, bool firstTime)
{
wxCoord y = 100;
dc.DestroyClippingRegion();
dc.SetBrush( *wxWHITE_BRUSH );
dc.SetPen( *wxTRANSPARENT_PEN );
dc.DrawRectangle( x, y, 310, 310 );
dc.SetClippingRegion( x + 10, y + 10, 100, 270 );
dc.SetBrush( *wxRED_BRUSH );
dc.DrawRectangle( x, y, 310, 310 );
dc.SetClippingRegion( x + 10, y + 10, 100, 100 );
dc.SetBrush( *wxCYAN_BRUSH );
dc.DrawRectangle( x, y, 310, 310 );
dc.DestroyClippingRegion();
wxRegion region(x + 110, y + 20, 100, 270);
#if !defined(__WXMOTIF__)
if ( !firstTime )
region.Offset(10, 10);
#endif
dc.SetDeviceClippingRegion(region);
dc.SetBrush( *wxGREY_BRUSH );
dc.DrawRectangle( x, y, 310, 310 );
if (m_smile_bmp.Ok())
{
dc.DrawBitmap( m_smile_bmp, x + 150, y + 150, true );
dc.DrawBitmap( m_smile_bmp, x + 130, y + 10, true );
dc.DrawBitmap( m_smile_bmp, x + 130, y + 280, true );
dc.DrawBitmap( m_smile_bmp, x + 100, y + 70, true );
dc.DrawBitmap( m_smile_bmp, x + 200, y + 70, true );
}
}
#if TEST_CAIRO_EVERYWHERE
extern wxGraphicsRenderer* gCairoRenderer;
#endif
void MyCanvas::OnPaint(wxPaintEvent &WXUNUSED(event))
{
wxPaintDC pdc(this);
#if wxUSE_GRAPHICS_CONTEXT
#if TEST_CAIRO_EVERYWHERE
wxGCDC gdc;
gdc.SetGraphicsContext( gCairoRenderer->CreateContext( pdc ) );
#else
wxGCDC gdc( pdc ) ;
#endif
wxDC &dc = m_useContext ? (wxDC&) gdc : (wxDC&) pdc ;
#else
wxDC &dc = pdc ;
#endif
PrepareDC(dc);
m_owner->PrepareDC(dc);
dc.SetBackgroundMode( m_owner->m_backgroundMode );
if ( m_owner->m_backgroundBrush.Ok() )
dc.SetBackground( m_owner->m_backgroundBrush );
if ( m_owner->m_colourForeground.Ok() )
dc.SetTextForeground( m_owner->m_colourForeground );
if ( m_owner->m_colourBackground.Ok() )
dc.SetTextBackground( m_owner->m_colourBackground );
if ( m_owner->m_textureBackground) {
if ( ! m_owner->m_backgroundBrush.Ok() ) {
wxColour clr(0,128,0);
wxBrush b(clr, wxSOLID);
dc.SetBackground(b);
}
}
if ( m_clip )
dc.SetClippingRegion(100, 100, 100, 100);
dc.Clear();
if ( m_owner->m_textureBackground )
{
dc.SetPen(*wxMEDIUM_GREY_PEN);
for ( int i = 0; i < 200; i++ )
dc.DrawLine(0, i*10, i*10, 0);
}
switch ( m_show )
{
case File_ShowDefault:
DrawDefault(dc);
break;
case File_ShowCircles:
DrawCircles(dc);
break;
case File_ShowSplines:
DrawSplines(dc);
break;
case File_ShowRegions:
DrawRegions(dc);
break;
case File_ShowText:
DrawText(dc);
break;
case File_ShowLines:
DrawTestLines( 0, 100, 0, dc );
DrawTestLines( 0, 320, 1, dc );
DrawTestLines( 0, 540, 2, dc );
DrawTestLines( 0, 760, 6, dc );
break;
case File_ShowBrushes:
DrawTestBrushes(dc);
break;
case File_ShowPolygons:
DrawTestPoly(dc);
break;
case File_ShowMask:
DrawImages(dc, Draw_Normal);
break;
case File_ShowMaskStretch:
DrawImages(dc, Draw_Stretch);
break;
case File_ShowOps:
DrawWithLogicalOps(dc);
break;
#if wxUSE_GRAPHICS_CONTEXT
case File_ShowAlpha:
DrawAlpha(dc);
break;
case File_ShowGraphics:
DrawGraphics(gdc.GetGraphicsContext());
break;
#endif
case File_ShowGradients:
DrawGradients(dc);
break;
default:
break;
}
}
void MyCanvas::OnMouseMove(wxMouseEvent &event)
{
#if wxUSE_STATUSBAR
{
wxClientDC dc(this);
PrepareDC(dc);
m_owner->PrepareDC(dc);
wxPoint pos = event.GetPosition();
long x = dc.DeviceToLogicalX( pos.x );
long y = dc.DeviceToLogicalY( pos.y );
wxString str;
str.Printf( wxT("Current mouse position: %d,%d"), (int)x, (int)y );
m_owner->SetStatusText( str );
}
if ( m_rubberBand )
{
int x,y, xx, yy ;
event.GetPosition(&x,&y);
CalcUnscrolledPosition( x, y, &xx, &yy );
m_currentpoint = wxPoint( xx , yy ) ;
wxRect newrect ( m_anchorpoint , m_currentpoint ) ;
wxClientDC dc( this ) ;
PrepareDC( dc ) ;
wxDCOverlay overlaydc( m_overlay, &dc );
overlaydc.Clear();
#ifdef __WXMAC__
dc.SetPen( *wxGREY_PEN );
dc.SetBrush( wxColour( 192,192,192,64 ) );
#else
dc.SetPen( wxPen( *wxLIGHT_GREY, 2, wxSOLID ) );
dc.SetBrush( *wxTRANSPARENT_BRUSH );
#endif
dc.DrawRectangle( newrect );
}
#else
wxUnusedVar(event);
#endif // wxUSE_STATUSBAR
}
void MyCanvas::OnMouseDown(wxMouseEvent &event)
{
int x,y,xx,yy ;
event.GetPosition(&x,&y);
CalcUnscrolledPosition( x, y, &xx, &yy );
m_anchorpoint = wxPoint( xx , yy ) ;
m_currentpoint = m_anchorpoint ;
m_rubberBand = true ;
CaptureMouse() ;
}
void MyCanvas::OnMouseUp(wxMouseEvent &event)
{
if ( m_rubberBand )
{
ReleaseMouse();
{
wxClientDC dc( this );
PrepareDC( dc );
wxDCOverlay overlaydc( m_overlay, &dc );
overlaydc.Clear();
}
m_overlay.Reset();
m_rubberBand = false;
int x,y,xx,yy ;
event.GetPosition(&x,&y);
CalcUnscrolledPosition( x, y, &xx, &yy );
wxString str;
str.Printf( wxT("Rectangle selection from %d,%d to %d,%d"),
m_anchorpoint.x, m_anchorpoint.y , (int)xx, (int)yy );
wxMessageBox( str , wxT("Rubber-Banding") );
}
}
// ----------------------------------------------------------------------------
// MyFrame
// ----------------------------------------------------------------------------
// the event tables connect the wxWidgets events with the functions (event
// handlers) which process them. It can be also done at run-time, but for the
// simple menu events like this the static method is much simpler.
BEGIN_EVENT_TABLE(MyFrame, wxFrame)
EVT_MENU (File_Quit, MyFrame::OnQuit)
EVT_MENU (File_About, MyFrame::OnAbout)
EVT_MENU (File_Clip, MyFrame::OnClip)
#if wxUSE_GRAPHICS_CONTEXT
EVT_MENU (File_GraphicContext, MyFrame::OnGraphicContext)
#endif
EVT_MENU_RANGE(MenuShow_First, MenuShow_Last, MyFrame::OnShow)
EVT_MENU_RANGE(MenuOption_First, MenuOption_Last, MyFrame::OnOption)
END_EVENT_TABLE()
// frame constructor
MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
: wxFrame((wxFrame *)NULL, wxID_ANY, title, pos, size,
wxDEFAULT_FRAME_STYLE | wxNO_FULL_REPAINT_ON_RESIZE)
{
// set the frame icon
SetIcon(wxICON(mondrian));
wxMenu *menuFile = new wxMenu;
menuFile->Append(File_ShowDefault, wxT("&Default screen\tF1"));
menuFile->Append(File_ShowText, wxT("&Text screen\tF2"));
menuFile->Append(File_ShowLines, wxT("&Lines screen\tF3"));
menuFile->Append(File_ShowBrushes, wxT("&Brushes screen\tF4"));
menuFile->Append(File_ShowPolygons, wxT("&Polygons screen\tF5"));
menuFile->Append(File_ShowMask, wxT("&Mask screen\tF6"));
menuFile->Append(File_ShowMaskStretch, wxT("1/&2 scaled mask\tShift-F6"));
menuFile->Append(File_ShowOps, wxT("&Raster operations screen\tF7"));
menuFile->Append(File_ShowRegions, wxT("Re&gions screen\tF8"));
menuFile->Append(File_ShowCircles, wxT("&Circles screen\tF9"));
#if wxUSE_GRAPHICS_CONTEXT
menuFile->Append(File_ShowAlpha, wxT("&Alpha screen\tF10"));
#endif
menuFile->Append(File_ShowSplines, wxT("&Splines screen\tF11"));
menuFile->Append(File_ShowGradients, wxT("&Gradients screen\tF12"));
#if wxUSE_GRAPHICS_CONTEXT
menuFile->Append(File_ShowGraphics, wxT("&Graphics screen"));
#endif
menuFile->AppendSeparator();
menuFile->AppendCheckItem(File_Clip, wxT("&Clip\tCtrl-C"), wxT("Clip/unclip drawing"));
#if wxUSE_GRAPHICS_CONTEXT
menuFile->AppendCheckItem(File_GraphicContext, wxT("&Use GraphicContext\tCtrl-Y"), wxT("Use GraphicContext"));
#endif
menuFile->AppendSeparator();
menuFile->Append(File_About, wxT("&About...\tCtrl-A"), wxT("Show about dialog"));
menuFile->AppendSeparator();
menuFile->Append(File_Quit, wxT("E&xit\tAlt-X"), wxT("Quit this program"));
wxMenu *menuMapMode = new wxMenu;
menuMapMode->Append( MapMode_Text, wxT("&TEXT map mode") );
menuMapMode->Append( MapMode_Lometric, wxT("&LOMETRIC map mode") );
menuMapMode->Append( MapMode_Twips, wxT("T&WIPS map mode") );
menuMapMode->Append( MapMode_Points, wxT("&POINTS map mode") );
menuMapMode->Append( MapMode_Metric, wxT("&METRIC map mode") );
wxMenu *menuUserScale = new wxMenu;
menuUserScale->Append( UserScale_StretchHoriz, wxT("Stretch &horizontally\tCtrl-H") );
menuUserScale->Append( UserScale_ShrinkHoriz, wxT("Shrin&k horizontally\tCtrl-G") );
menuUserScale->Append( UserScale_StretchVertic, wxT("Stretch &vertically\tCtrl-V") );
menuUserScale->Append( UserScale_ShrinkVertic, wxT("&Shrink vertically\tCtrl-W") );
menuUserScale->AppendSeparator();
menuUserScale->Append( UserScale_Restore, wxT("&Restore to normal\tCtrl-0") );
wxMenu *menuAxis = new wxMenu;
menuAxis->AppendCheckItem( AxisMirror_Horiz, wxT("Mirror horizontally\tCtrl-M") );
menuAxis->AppendCheckItem( AxisMirror_Vertic, wxT("Mirror vertically\tCtrl-N") );
wxMenu *menuLogical = new wxMenu;
menuLogical->Append( LogicalOrigin_MoveDown, wxT("Move &down\tCtrl-D") );
menuLogical->Append( LogicalOrigin_MoveUp, wxT("Move &up\tCtrl-U") );
menuLogical->Append( LogicalOrigin_MoveLeft, wxT("Move &right\tCtrl-L") );
menuLogical->Append( LogicalOrigin_MoveRight, wxT("Move &left\tCtrl-R") );
menuLogical->AppendSeparator();
menuLogical->Append( LogicalOrigin_Set, wxT("Set to (&100, 100)\tShift-Ctrl-1") );
menuLogical->Append( LogicalOrigin_Restore, wxT("&Restore to normal\tShift-Ctrl-0") );
wxMenu *menuColour = new wxMenu;
#if wxUSE_COLOURDLG
menuColour->Append( Colour_TextForeground, wxT("Text &foreground...") );
menuColour->Append( Colour_TextBackground, wxT("Text &background...") );
menuColour->Append( Colour_Background, wxT("Background &colour...") );
#endif // wxUSE_COLOURDLG
menuColour->AppendCheckItem( Colour_BackgroundMode, wxT("&Opaque/transparent\tCtrl-B") );
menuColour->AppendCheckItem( Colour_TextureBackgound, wxT("Draw textured back&ground\tCtrl-T") );
// now append the freshly created menu to the menu bar...
wxMenuBar *menuBar = new wxMenuBar;
menuBar->Append(menuFile, wxT("&File"));
menuBar->Append(menuMapMode, wxT("&Mode"));
menuBar->Append(menuUserScale, wxT("&Scale"));
menuBar->Append(menuAxis, wxT("&Axis"));
menuBar->Append(menuLogical, wxT("&Origin"));
menuBar->Append(menuColour, wxT("&Colours"));
// ... and attach this menu bar to the frame
SetMenuBar(menuBar);
#if wxUSE_STATUSBAR
CreateStatusBar(2);
SetStatusText(wxT("Welcome to wxWidgets!"));
#endif // wxUSE_STATUSBAR
m_mapMode = wxMM_TEXT;
m_xUserScale = 1.0;
m_yUserScale = 1.0;
m_xLogicalOrigin = 0;
m_yLogicalOrigin = 0;
m_xAxisReversed =
m_yAxisReversed = false;
m_backgroundMode = wxSOLID;
m_colourForeground = *wxBLACK;
m_colourBackground = *wxLIGHT_GREY;
m_textureBackground = false;
m_canvas = new MyCanvas( this );
m_canvas->SetScrollbars( 10, 10, 100, 240 );
}
// event handlers
void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
{
// true is to force the frame to close
Close(true);
}
void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
{
wxString msg;
msg.Printf( wxT("This is the about dialog of the drawing sample.\n")
wxT("This sample tests various primitive drawing functions\n")
wxT("(without any attempts to prevent flicker).\n")
wxT("Copyright (c) Robert Roebling 1999")
);
wxMessageBox(msg, wxT("About Drawing"), wxOK | wxICON_INFORMATION, this);
}
void MyFrame::OnClip(wxCommandEvent& event)
{
m_canvas->Clip(event.IsChecked());
}
#if wxUSE_GRAPHICS_CONTEXT
void MyFrame::OnGraphicContext(wxCommandEvent& event)
{
m_canvas->UseGraphicContext(event.IsChecked());
}
#endif
void MyFrame::OnShow(wxCommandEvent& event)
{
m_canvas->ToShow(event.GetId());
}
void MyFrame::OnOption(wxCommandEvent& event)
{
switch (event.GetId())
{
case MapMode_Text:
m_mapMode = wxMM_TEXT;
break;
case MapMode_Lometric:
m_mapMode = wxMM_LOMETRIC;
break;
case MapMode_Twips:
m_mapMode = wxMM_TWIPS;
break;
case MapMode_Points:
m_mapMode = wxMM_POINTS;
break;
case MapMode_Metric:
m_mapMode = wxMM_METRIC;
break;
case LogicalOrigin_MoveDown:
m_yLogicalOrigin += 10;
break;
case LogicalOrigin_MoveUp:
m_yLogicalOrigin -= 10;
break;
case LogicalOrigin_MoveLeft:
m_xLogicalOrigin += 10;
break;
case LogicalOrigin_MoveRight:
m_xLogicalOrigin -= 10;
break;
case LogicalOrigin_Set:
m_xLogicalOrigin =
m_yLogicalOrigin = -100;
break;
case LogicalOrigin_Restore:
m_xLogicalOrigin =
m_yLogicalOrigin = 0;
break;
case UserScale_StretchHoriz:
m_xUserScale *= 1.10;
break;
case UserScale_ShrinkHoriz:
m_xUserScale /= 1.10;
break;
case UserScale_StretchVertic:
m_yUserScale *= 1.10;
break;
case UserScale_ShrinkVertic:
m_yUserScale /= 1.10;
break;
case UserScale_Restore:
m_xUserScale =
m_yUserScale = 1.0;
break;
case AxisMirror_Vertic:
m_yAxisReversed = !m_yAxisReversed;
break;
case AxisMirror_Horiz:
m_xAxisReversed = !m_xAxisReversed;
break;
#if wxUSE_COLOURDLG
case Colour_TextForeground:
m_colourForeground = SelectColour();
break;
case Colour_TextBackground:
m_colourBackground = SelectColour();
break;
case Colour_Background:
{
wxColour col = SelectColour();
if ( col.Ok() )
{
m_backgroundBrush.SetColour(col);
}
}
break;
#endif // wxUSE_COLOURDLG
case Colour_BackgroundMode:
m_backgroundMode = m_backgroundMode == wxSOLID ? wxTRANSPARENT
: wxSOLID;
break;
case Colour_TextureBackgound:
m_textureBackground = ! m_textureBackground;
break;
default:
// skip Refresh()
return;
}
m_canvas->Refresh();
}
void MyFrame::PrepareDC(wxDC& dc)
{
dc.SetLogicalOrigin( m_xLogicalOrigin, m_yLogicalOrigin );
dc.SetAxisOrientation( !m_xAxisReversed, m_yAxisReversed );
dc.SetUserScale( m_xUserScale, m_yUserScale );
dc.SetMapMode( m_mapMode );
}
#if wxUSE_COLOURDLG
wxColour MyFrame::SelectColour()
{
wxColour col;
wxColourData data;
wxColourDialog dialog(this, &data);
if ( dialog.ShowModal() == wxID_OK )
{
col = dialog.GetColourData().GetColour();
}
return col;
}
#endif // wxUSE_COLOURDLG
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