_beginPaint _impl beginPaint beginPaintBuffered beginPath bezierTo clearCachedBitmap clearRect clearWindow clipPath clipRect closePath drawBitmap drawCachedBitmap drawCachedBitmap2 drawEllipse drawHandle drawLine drawPath drawRect drawTextAt endPaint getEncoder GiGdipCanvas hasCachedBitmap isBufferedDrawing lineTo moveTo quadTo restoreClip save saveCachedBitmap saveClip setBrush setPen thumbnailImage ~GiGdipCanvas

drawTextAt() float GiGdipCanvas::drawTextAt ( const char *  text, float  x, float  y, float  h, int  align, float  angle  ) virtual Draw text in one line. Uses the current font and fill color to draw the text aligned on top. 参数 text The text to draw. x X of horizontal alignment position. y Y of horizontal alignment position. h Text height in point(or pixel) unit. align alignment type, kAlignLeft|kAlignTop. angle Rotate angle in radians, it's positive direction is CCW in the world coordinate system. 返回 Actual display width. 实现了 GiCanvas.