最終更新:2013-03-11 (月) 02:33:46 (4056d)  

CanvasRenderingContext2D
Top / CanvasRenderingContext2D

http://www.w3.org/TR/2dcontext/

  • 現在、利用可能なコンテクストは 2D コンテクストの1つしかない。 
    context = canvas.getContext('2d');

インターフェイス 

interface CanvasRenderingContext2D {

  // back-reference to the canvas
  readonly attribute HTMLCanvasElement canvas;

  // state
  void save(); // push state on state stack
  void restore(); // pop state stack and restore state

  // transformations (default transform is the identity matrix)
  void scale(unrestricted double x, unrestricted double y);
  void rotate(unrestricted double angle);
  void translate(unrestricted double x, unrestricted double y);
  void transform(unrestricted double a, unrestricted double b, unrestricted double c, unrestricted double d, unrestricted double e, unrestricted double f);
  void setTransform(unrestricted double a, unrestricted double b, unrestricted double c, unrestricted double d, unrestricted double e, unrestricted double f);

  // compositing
           attribute unrestricted double globalAlpha; // (default 1.0)
           attribute DOMString globalCompositeOperation; // (default source-over)

  // colors and styles (see also the CanvasDrawingStyles interface)
           attribute (DOMString or CanvasGradient or CanvasPattern) strokeStyle; // (default black)
           attribute (DOMString or CanvasGradient or CanvasPattern) fillStyle; // (default black)
  CanvasGradient createLinearGradient(double x0, double y0, double x1, double y1);
  CanvasGradient createRadialGradient(double x0, double y0, double r0, double x1, double y1, double r1);
  CanvasPattern createPattern((HTMLImageElement or HTMLCanvasElement or HTMLVideoElement) image, [TreatNullAs=Emptytring]DOMString repetition);

  // shadows
           attribute unrestricted double shadowOffsetX; // (default 0)
           attribute unrestricted double shadowOffsetY; // (default 0)
           attribute unrestricted double shadowBlur; // (default 0)
           attribute DOMString shadowColor; // (default transparent black)

  // rects
  void clearRect(unrestricted double x, unrestricted double y, unrestricted double w, unrestricted double h);
  void fillRect(unrestricted double x, unrestricted double y, unrestricted double w, unrestricted double h);
  void strokeRect(unrestricted double x, unrestricted double y, unrestricted double w, unrestricted double h);

  // path API (see also CanvasPathMethods)
  void beginPath();
  void fill();
  void fill(Path path);
  void stroke();
  void stroke(Path path);
  void drawSystemFocusRing(Element element);
  void drawSystemFocusRing(Path path, Element element);
  boolean drawCustomFocusRing(Element element);
  boolean drawCustomFocusRing(Path path, Element element);
  void scrollPathIntoView();
  void scrollPathIntoView(Path path);
  void clip();
  void clip(Path path);
  boolean isPointInPath(unrestricted double x, unrestricted double y);
  boolean isPointInPath(Path path, unrestricted double x, unrestricted double y);

  // text (see also the CanvasDrawingStyles interface)
  void fillText(DOMString text, unrestricted double x, unrestricted double y, optional unrestricted double maxWidth);
  void strokeText(DOMString text, unrestricted double x, unrestricted double y, optional unrestricted double maxWidth);
  TextMetrics measureText(DOMString text);

  // drawing images
  void drawImage((HTMLImageElement or HTMLCanvasElement or HTMLVideoElement) image, unrestricted double dx, unrestricted double dy);
  void drawImage((HTMLImageElement or HTMLCanvasElement or HTMLVideoElement) image, unrestricted double dx, unrestricted double dy, unrestricted double dw, unrestricted double dh);
  void drawImage((HTMLImageElement or HTMLCanvasElement or HTMLVideoElement) image, unrestricted double sx, unrestricted double sy, unrestricted double sw, unrestricted double sh, unrestricted double dx, unrestricted double dy, unrestricted double dw, unrestricted double dh);

  // hit regions
  void addHitRegion(HitRegionOptions options);
  void removeHitRegion(HitRegionOptions options);

  // pixel manipulation
  ImageData createImageData(unrestricted double sw, unrestricted double sh);
  ImageData createImageData(ImageData imagedata);
  ImageData getImageData(double sx, double sy, double sw, double sh);
  void putImageData(ImageData imagedata, double dx, double dy, double dirtyX, double dirtyY, double dirtyWidth, double dirtyHeight);
  void putImageData(ImageData imagedata, double dx, double dy);
};
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