wxWidgets/interface/wx/dcsvg.h

/////////////////////////////////////////////////////////////////////////////
// Name:        dcsvg.h
// Purpose:     interface of wxSVGFileDC
// Author:      wxWidgets team
// RCS-ID:      $Id$
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

/**
    @class wxSVGFileDC

    A wxSVGFileDC is a device context onto which graphics and text can be
    drawn, and the output produced as a vector file, in SVG format (see the W3C
    SVG Specifications <http://www.w3.org/TR/2001/REC-SVG-20010904/>). This
    format can be read by a range of programs, including a Netscape plugin
    (Adobe), full details are given in the SVG Implementation and Resource
    Directory <http://www.svgi.org/>. Vector formats may often be smaller than
    raster formats.

    The intention behind wxSVGFileDC is that it can be used to produce a file
    corresponding to the screen display context, wxSVGFileDC, by passing the
    wxSVGFileDC as a parameter instead of a wxSVGFileDC. Thus the wxSVGFileDC
    is a write-only class.

    As the wxSVGFileDC is a vector format, raster operations like GetPixel()
    are unlikely to be supported. However, the SVG specification allows for PNG
    format raster files to be embedded in the SVG, and so bitmaps, icons and
    blit operations in wxSVGFileDC are supported.

    A more substantial SVG library (for reading and writing) is available at
    the wxArt2D website <http://wxart2d.sourceforge.net/>.

    @library{wxcore}
    @category{dc}
*/
class wxSVGFileDC : public wxDC
{
public:
    /**
        Initializes a wxSVGFileDC with the given @a f filename with the given
        @a Width and @a Height at @a dpi resolution.
    */
    wxSVGFileDC(const wxString& filename, int width = 320, int height = 240, double dpi = 72);

    /**
        Destructor.
    */
    virtual ~wxSVGFileDC();

    /**
        Copies from a source DC to this DC, specifying the destination
        coordinates, size of area to copy, source DC, source coordinates,
        logical function, whether to use a bitmap mask, and mask source
        position.

        @see wxDC::Blit()
    */
    bool Blit(wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
              wxDC* source, wxCoord xsrc, wxCoord ysrc, int rop = wxCOPY,
              bool useMask = false, wxCoord xsrcMask = wxDefaultCoord,
              wxCoord ysrcMask = wxDefaultCoord);

    /**
        Adds the specified point to the bounding box which can be retrieved
        with wxDC::MinX(), wxDC::MaxX() and wxDC::MinY(), wxDC::MaxY()
        functions.
    */
    void CalcBoundingBox(wxCoord x, wxCoord y);

    /**
        This makes no sense in wxSVGFileDC and does nothing.
    */
    void Clear();

    /**
        Not Implemented.
    */
    void CrossHair(wxCoord x, wxCoord y);

    /**
        Not Implemented.
    */
    void DestroyClippingRegion();

    /**
        Convert device X coordinate to logical coordinate, using the current
        mapping mode.
    */
    wxCoord DeviceToLogicalX(wxCoord x) const;

    /**
        Convert device X coordinate to relative logical coordinate, using the
        current mapping mode but ignoring the x axis orientation. Use this
        function for converting a width, for example.
    */
    wxCoord DeviceToLogicalXRel(wxCoord x) const;

    /**
        Converts device Y coordinate to logical coordinate, using the current
        mapping mode.
    */
    wxCoord DeviceToLogicalY(wxCoord y) const;

    /**
        Convert device Y coordinate to relative logical coordinate, using the
        current mapping mode but ignoring the y axis orientation. Use this
        function for converting a height, for example.
    */
    wxCoord DeviceToLogicalYRel(wxCoord y) const;

    /**
        Draws an arc of a circle, centred on (@a xc, @a yc), with starting
        point (@a x1, @a y1) and ending at (@a x2, @a y2). The current pen is
        used for the outline and the current brush for filling the shape.

        The arc is drawn in a counter-clockwise direction from the start point
        to the end point.
    */
    void DrawArc(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2,
                 wxCoord xc, wxCoord yc);

    /**
        Draw a bitmap on the device context at the specified point. If
        @a useMask is @true and the bitmap has a transparency mask, the
        bitmap will be drawn transparently.

        When drawing a mono-bitmap, the current text foreground colour will be
        used to draw the foreground of the bitmap (all bits set to 1), and the
        current text background colour to draw the background (all bits set to
        0).

        @see wxDC::SetTextForeground(), wxDC::SetTextBackground(), wxMemoryDC
    */
    void DrawBitmap(const wxBitmap& bitmap, wxCoord x, wxCoord y,
                    bool useMask = false);

    //@{
    /**
        Draws a check mark inside the given rectangle.
    */
    void DrawCheckMark(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
    void DrawCheckMark(const wxRect& rect);
    //@}

    //@{
    /**
        Draws a circle with the given centre and radius.

        @see wxDC::DrawEllipse()
    */
    void DrawCircle(wxCoord x, wxCoord y, wxCoord radius);
    void DrawCircle(const wxPoint& pt, wxCoord radius);
    //@}

    //@{
    /**
        Draws an ellipse contained in the rectangle specified either with the
        given top left corner and the given size or directly. The current pen
        is used for the outline and the current brush for filling the shape.

        @see wxDC::DrawCircle()
    */
    void DrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
    void DrawEllipse(const wxPoint& pt, const wxSize& size);
    void DrawEllipse(const wxRect& rect);
    //@}

    /**
        Draws an arc of an ellipse. The current pen is used for drawing the arc
        and the current brush is used for drawing the pie.

        @a x and @a y specify the x and y coordinates of the upper-left corner
        of the rectangle that contains the ellipse.

        @a width and @a height specify the width and height of the rectangle
        that contains the ellipse.

        @a start and @a end specify the start and end of the arc relative to
        the three-o'clock position from the center of the rectangle. Angles are
        specified in degrees (360 is a complete circle). Positive values mean
        counter-clockwise motion. If @a start is equal to @a end, a complete
        ellipse will be drawn.
    */
    void DrawEllipticArc(wxCoord x, wxCoord y, wxCoord width, wxCoord height,
                         double start, double end);

    /**
        Draw an icon on the display (does nothing if the device context is
        PostScript). This can be the simplest way of drawing bitmaps on a
        window.
    */
    void DrawIcon(const wxIcon& icon, wxCoord x, wxCoord y);

    /**
        Draws a line from the first point to the second. The current pen is
        used for drawing the line.
    */
    void DrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2);

    //@{
    /**
        Draws lines using an array of @a points of size @a n, or list of
        pointers to points, adding the optional offset coordinate. The current
        pen is used for drawing the lines. The programmer is responsible for
        deleting the list of points.
    */
    void DrawLines(int n, wxPoint points[], wxCoord xoffset = 0,
                   wxCoord yoffset = 0);
    void DrawLines(wxList* points, wxCoord xoffset = 0,
                   wxCoord yoffset = 0);
    //@}

    /**
        Draws a point using the current pen.
    */
    void DrawPoint(wxCoord x, wxCoord y);

    //@{
    /**
        Draws a filled polygon using an array of @a points of size @a n,
        or list of pointers to points, adding the optional offset coordinate.
        wxWidgets automatically closes the first and last points.

        The last argument specifies the fill rule: @c wxODDEVEN_RULE (the
        default) or @c wxWINDING_RULE.

        The current pen is used for drawing the outline, and the current brush
        for filling the shape. Using a transparent brush suppresses filling.

        The programmer is responsible for deleting the list of points.
    */
    void DrawPolygon(int n, wxPoint points[], wxCoord xoffset = 0,
                     wxCoord yoffset = 0, int fill_style = wxODDEVEN_RULE);
    void DrawPolygon(wxList* points, wxCoord xoffset = 0,
                     wxCoord yoffset = 0, int fill_style = wxODDEVEN_RULE);
    //@}

    /**
        Draws a rectangle with the given top left corner, and with the given
        size.  The current pen is used for the outline and the current brush
        for filling the shape.
    */
    void DrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height);

    /**
        Draws the text rotated by @a angle degrees.

        The wxMSW wxDC and wxSVGFileDC rotate the text around slightly
        different points, depending on the size of the font.
    */
    void DrawRotatedText(const wxString& text, wxCoord x, wxCoord y,
                         double angle);

    /**
        Draws a rectangle with the given top left corner, and with the given
        size.  The corners are quarter-circles using the given radius. The
        current pen is used for the outline and the current brush for filling
        the shape.

        If @a radius is positive, the value is assumed to be the radius of the
        rounded corner. If @a radius is negative, the absolute value is assumed
        to be the @e proportion of the smallest dimension of the rectangle.
        This means that the corner can be a sensible size relative to the size
        of the rectangle, and also avoids the strange effects X produces when
        the corners are too big for the rectangle.
    */
    void DrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width,
                              wxCoord height, double radius = 20);

    /**
        Draws a spline between all given control points, using the current pen.
        The programmer is responsible for deleting the list of points.
        The spline is drawn using a series of lines, using an algorithm taken from
        the X drawing program "XFIG".
    */
    void DrawSpline(const wxPointList* points);

    /**
        Draws a three-point spline using the current pen.
    */
    void DrawSpline(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2,
                    wxCoord x3, wxCoord y3);

    /**
        Draws a text string at the specified point, using the current text
        font, and the current text foreground and background colours.

        The coordinates refer to the top-left corner of the rectangle bounding
        the string. See wxDC::GetTextExtent() for how to get the dimensions of
        a text string, which can be used to position the text more precisely.
    */
    void DrawText(const wxString& text, wxCoord x, wxCoord y);

    /**
        Does nothing.
    */
    void EndDoc();

    /**
        Does nothing.
    */
    void EndDrawing();

    /**
        Does nothing.
    */
    void EndPage();

    /**
        Not implemented.
    */
    bool FloodFill(wxCoord x, wxCoord y, const wxColour& colour,
                   int style = wxFLOOD_SURFACE);

    //@{
    /**
        Gets the brush used for painting the background.

        @see SetBackground()
    */
    wxBrush GetBackground() const;
    const wxBrush GetBackground() const;
    //@}

    /**
        Returns the current background mode: @c wxSOLID or @c wxTRANSPARENT.

        @see SetBackgroundMode()
    */
    int GetBackgroundMode() const;

    //@{
    /**
        Gets the current brush.

        @see SetBrush()
    */
    wxBrush GetBrush() const;
    const wxBrush GetBrush() const;
    //@}

    /**
        Gets the character height of the currently set font.
    */
    wxCoord GetCharHeight() const;

    /**
        Gets the average character width of the currently set font.
    */
    wxCoord GetCharWidth() const;

    /**
        Not implemented.
    */
    void GetClippingBox(wxCoord *x, wxCoord *y, wxCoord *width, wxCoord *height) const;

    //@{
    /**
        Gets the current font.

        @see SetFont()
    */
    wxFont GetFont() const;
    const wxFont GetFont() const;
    //@}

    /**
        Gets the current logical function.

        @see SetLogicalFunction()
    */
    int GetLogicalFunction() const;

    /**
        Gets the mapping mode for the device context.

        @see SetMapMode()
    */
    int GetMapMode() const;

    //@{
    /**
        Gets the current pen.

        @see SetPen()
    */
    wxPen GetPen() const;
    const wxPen GetPen() const;
    //@}

    /**
        Not implemented.
    */
    bool GetPixel(wxCoord x, wxCoord y, wxColour* colour) const;

    /**
        For a Windows printer device context, this gets the horizontal and
        vertical resolution.
    */
    void GetSize(wxCoord* width, wxCoord* height);

    //@{
    /**
        Gets the current text background colour.

        @see SetTextBackground()
    */
    wxColour GetTextBackground() const;
    const wxColour& GetTextBackground() const;
    //@}

    /**
        Gets the dimensions of the string using the currently selected font.

        @param string
            The text string to measure.
        @param w
            This value will be set to the width after this call.
        @param h
            This value will be set to the height after this call.
        @param descent
            The dimension from the baseline of the font to the bottom of the
            descender.
        @param externalLeading
            Any extra vertical space added to the font by the font designer
            (usually is zero).
        @param font
            Specifies an alternative to the currently selected font: but note
            that this does not yet work under Windows, so you need to set a
            font for the device context first.

        @see wxFont, SetFont()
    */
    void GetTextExtent(const wxString& string, wxCoord* w, wxCoord* h,
                       wxCoord* descent = NULL,
                       wxCoord* externalLeading = NULL,
                       const wxFont* font = NULL) const;

    //@{
    /**
        Gets the current text foreground colour.

        @see SetTextForeground()
    */
    wxColour GetTextForeground() const;
    const wxColour GetTextForeground() const;
    //@}

    /**
        Gets the current user scale factor.

        @see SetUserScale()
    */
    void GetUserScale(double* x, double* y) const;

    /**
        Converts logical X coordinate to device coordinate, using the current
        mapping mode.
    */
    wxCoord LogicalToDeviceX(wxCoord x) const;

    /**
        Converts logical X coordinate to relative device coordinate, using the
        current mapping mode but ignoring the x axis orientation. Use this for
        converting a width, for example.
    */
    wxCoord LogicalToDeviceXRel(wxCoord x) const;

    /**
        Converts logical Y coordinate to device coordinate, using the current
        mapping mode.
    */
    wxCoord LogicalToDeviceY(wxCoord y) const;

    /**
        Converts logical Y coordinate to relative device coordinate, using the
        current mapping mode but ignoring the y axis orientation. Use this for
        converting a height, for example.
    */
    wxCoord LogicalToDeviceYRel(wxCoord y) const;

    /**
        Gets the maximum horizontal extent used in drawing commands so far.
    */
    wxCoord MaxX() const;

    /**
        Gets the maximum vertical extent used in drawing commands so far.
    */
    wxCoord MaxY() const;

    /**
        Gets the minimum horizontal extent used in drawing commands so far.
    */
    wxCoord MinX() const;

    /**
        Gets the minimum vertical extent used in drawing commands so far.
    */
    wxCoord MinY() const;

    /**
        Returns @true if the DC is ok to use. @false values arise from being
        unable to write the file.
    */
    bool Ok();

    /**
        Resets the bounding box. After a call to this function, the bounding
        box doesn't contain anything.

        @see CalcBoundingBox()
    */
    void ResetBoundingBox();

    /**
        Sets the x and y axis orientation (i.e., the direction from lowest to
        highest values on the axis). The default orientation is the natural
        orientation, e.g. x axis from left to right and y axis from bottom up.

        @param xLeftRight
            @true to set the x axis orientation to the natural left to right
            orientation, @false to invert it.
        @param yBottomUp
            @true to set the y axis orientation to the natural bottom up
            orientation, @false to invert it.
    */
    void SetAxisOrientation(bool xLeftRight, bool yBottomUp);

    /**
        Sets the current background brush for the DC.
    */
    void SetBackground(const wxBrush& brush);

    /**
        @a mode may be one of wxSOLID and wxTRANSPARENT. This setting determines
        whether text will be drawn with a background colour or not.
    */
    void SetBackgroundMode(int mode);

    /**
        Sets the current brush for the DC. If the argument is wxNullBrush, the
        current brush is selected out of the device context, and the original
        brush restored, allowing the current brush to be destroyed safely.

        @see wxBrush, wxMemoryDC (for the interpretation of colours
             when drawing into a monochrome bitmap).
    */
    void SetBrush(const wxBrush& brush);

    //@{
    /**
        Not implemented.
    */
    void SetClippingRegion(wxCoord x, wxCoord y, wxCoord width,
                           wxCoord height);
    void SetClippingRegion(const wxPoint& pt, const wxSize& sz);
    void SetClippingRegion(const wxRect& rect);
    void SetClippingRegion(const wxRegion& region);
    //@}

    /**
        Sets the device origin (i.e., the origin in pixels after scaling has
        been applied). This function may be useful in Windows printing
        operations for placing a graphic on a page.
    */
    void SetDeviceOrigin(wxCoord x, wxCoord y);

    /**
        Sets the current font for the DC. It must be a valid font, in
        particular you should not pass @c wxNullFont to this method.

        @see wxFont
    */
    void SetFont(const wxFont& font);

    /**
        Does the same as wxDC::SetLogicalFunction(), except that only wxCOPY is
        avalaible. Trying to set one of the othe values will fail.
    */
    void SetLogicalFunction(int function);

    /**
        The mapping mode of the device context defines the unit of measurement
        used to convert logical units to device units. Note that in X, text
        drawing isn't handled consistently with the mapping mode; a font is
        always specified in point size. However, setting the user scale scales
        the text appropriately. In Windows, scalable TrueType fonts are always
        used; in X, results depend on availability of fonts, but usually a
        reasonable match is found.

        Note that the coordinate origin should ideally be selectable, but for
        now is always at the top left of the screen/printer.

        Drawing to a Windows printer device context under UNIX uses the current
        mapping mode, but mapping mode is currently ignored for PostScript
        output.

        The mapping mode can be one of the following:
        - wxMM_TWIPS    - Each logical unit is 1/20 of a point, or 1/1440 of an
                          inch.
        - wxMM_POINTS   - Each logical unit is a point, or 1/72 of an inch.
        - wxMM_METRIC   - Each logical unit is 1 mm.
        - wxMM_LOMETRIC - Each logical unit is 1/10 of a mm.
        - wxMM_TEXT     - Each logical unit is 1 pixel.
    */
    void SetMapMode(int mode);

    /**
        Not implemented.
    */
    void SetPalette(const wxPalette& palette);

    /**
        Sets the current pen for the DC. If the argument is wxNullPen, the
        current pen is selected out of the device context, and the original pen
        restored.

        @see wxMemoryDC (for the interpretation of colours when drawing into a
             monochrome bitmap)
    */
    void SetPen(const wxPen& pen);

    /**
        Sets the current text background colour for the DC.
    */
    void SetTextBackground(const wxColour& colour);

    /**
        Sets the current text foreground colour for the DC.

        @see wxMemoryDC (for the interpretation of colours when drawing into a
             monochrome bitmap)
    */
    void SetTextForeground(const wxColour& colour);

    /**
        Sets the user scaling factor, useful for applications which require
        "zooming".
    */
    void SetUserScale(double xScale, double yScale);

    /**
        Does nothing.
    */
    bool StartDoc(const wxString& message);
};