beginPath beginShape bezierTo clearRect clipPath clipRect close closePath drawBitmap drawEllipse drawHandle drawLine drawPath drawRect drawTextAt endShape GiSvgCanvas im lineTo moveTo open quadTo restoreClip saveClip setBrush setPen ~GiSvgCanvas

clearRect() void GiSvgCanvas::clearRect ( float  x, float  y, float  w, float  h  ) privatevirtual Clear `rect' (that is, set the region within the rect to transparent). 实现了 GiCanvas.