_cache _ctx _fill _fillARGB _gradient _gradient0 beginPaint beginPath bezierTo clearRect clipPath clipRect closePath colorPart context drawBitmap drawEllipse drawHandle drawLine drawPath drawRect drawTextAt endPaint GiCanvasAdapter LINEDASH lineTo moveTo quadTo restoreClip saveClip setBrush setPen ~GiCanvasAdapter

drawLine() void GiCanvasAdapter::drawLine ( float  x1, float  y1, float  x2, float  y2  ) virtual Stroke a line with the current color. 实现了 GiCanvas.