QPainter的绘图函数

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drawArc()                                 弧
drawChord()                               弦
drawConvexPolygon()                       凸多边形
drawEllipse()                             椭圆
drawImage()                               QImage表示的图像
drawLine()                                线
drawLines()                               多条线
drawPath()                                路径
drawPicture()                             按QPainter指令绘制
drawPie()                                 扇形
drawPixmap()                              QPixmap表示的图像
drawPoint()                               点
drawPoints()                              多个点
drawPolygon()                             多边形
drawPolyline()                            多折线
drawRect()                                矩形
drawRects()                               多个矩形
drawRoundRect()                           圆角矩形
drawText()                                文字
drawTiledPixmap()                         平铺图像
drawLineSegments()                        绘制折线
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drawPicture()函数负责绘制QPicture中存储的QPainter指令，QPicture是可以记录QPainter绘图指令的类.它将QPainter的绘图指令串行化为平台无关的存储格式。下面的代码将记录的绘图指令重绘。
QPicture picture;
picture.load("mypicture.pic");
QPainter painter(this);
painter.drawPicture(0,0,picture);//在(0,0)处重放绘图指令，也可以使用QPicture::play()完成相同的功能

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