/usr/include/Wt/WCanvasPaintDevice is in libwt-dev 3.3.3+dfsg-4.1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 | // This may look like C code, but it's really -*- C++ -*-
/*
* Copyright (C) 2008 Emweb bvba, Kessel-Lo, Belgium.
*
* See the LICENSE file for terms of use.
*/
#ifndef WCANVAS_PAINT_DEVICE_H_
#define WCANVAS_PAINT_DEVICE_H_
#include <Wt/WBrush>
#include <Wt/WFont>
#include <Wt/WObject>
#include <Wt/WPaintDevice>
#include <Wt/WPen>
#include <Wt/WPointF>
#include <Wt/WShadow>
#include <Wt/WTransform>
#include <sstream>
namespace Wt {
class DomElement;
class WTransform;
/*! \class WCanvasPaintDevice Wt/WCanvasPaintDevice Wt/WCanvasPaintDevice
* \brief A paint device for rendering using the HTML 5 <canvas> element.
*
* The %WCanvasPaintDevice is used by WPaintedWidget to render to the
* browser using the HTML 5 <canvas> element. You usually will
* not use the device directly, but rather rely on WPaintedWidget to
* use this device when appropriate.
*
* \note Older browsers do not have text support in <canvas>.
* Text is then rendered in an overlayed DIV and a consequence text is
* not subject to rotation and scaling components of the current
* transformation (but does take into account translation). On most
* browser you can use the WSvgImage or WVmlImage paint devices which
* do support text natively.
*
* \ingroup painting
*/
class WT_API WCanvasPaintDevice : public WObject, public WPaintDevice
{
public:
/*! \brief Create a canvas paint device.
*/
WCanvasPaintDevice(const WLength& width, const WLength& height,
WObject *parent = 0,
bool paintUpdate = false);
virtual WFlags<FeatureFlag> features() const;
virtual void setChanged(WFlags<ChangeFlag> flags);
virtual void drawArc(const WRectF& rect, double startAngle, double spanAngle);
virtual void drawImage(const WRectF& rect, const std::string& imgUri,
int imgWidth, int imgHeight, const WRectF& sourceRect);
virtual void drawLine(double x1, double y1, double x2, double y2);
virtual void drawPath(const WPainterPath& path);
virtual void drawText(const WRectF& rect,
WFlags<AlignmentFlag> alignmentFlags,
TextFlag textFlag,
const WString& text);
virtual WTextItem measureText(const WString& text, double maxWidth = -1,
bool wordWrap = false);
virtual WFontMetrics fontMetrics();
virtual void init();
virtual void done();
virtual bool paintActive() const { return painter_ != 0; }
void render(const std::string& canvasId, DomElement* text);
void renderPaintCommands(std::stringstream& js, const std::string& element);
virtual WLength width() const { return width_; }
virtual WLength height() const { return height_; }
protected:
virtual WPainter *painter() const { return painter_; }
virtual void setPainter(WPainter *painter) { painter_ = painter; }
private:
enum TextMethod { MozText, Html5Text, DomText };
WLength width_, height_;
WPainter *painter_;
WFlags<ChangeFlag> changeFlags_;
bool paintUpdate_;
TextMethod textMethod_;
bool busyWithPath_;
WTransform currentTransform_;
WBrush currentBrush_;
WPen currentPen_;
WShadow currentShadow_;
WFont currentFont_;
WPointF pathTranslation_;
AlignmentFlag currentTextHAlign_, currentTextVAlign_;
std::stringstream js_;
std::vector<DomElement *> textElements_;
std::vector<std::string> images_;
void finishPath();
void renderTransform(std::stringstream& s, const WTransform& t,
bool invert = false);
void renderStateChanges(bool resetPathTranslation);
void resetPathTranslation();
void drawPlainPath(std::stringstream& s, const WPainterPath& path);
int createImage(const std::string& imgUri);
TextMethod textMethod() const { return textMethod_; }
friend class WWidgetCanvasPainter;
};
}
#endif // WCANVAS_PAINT_DEVICE_H_
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