使用GDI+来实现抗锯齿，如果单单使用GDI是不能实现抗锯齿的。
使用qt的话，也可以实现抗锯齿，并且不只是一些线条的抗拒，比如说是画直线或者圆的时候，text也可以抗拒。
参看qt的帮助文档：
| QPainter::Antialiasing | 0x01 | Indicates that the engine should antialias edges of primitives if possible. |
| QPainter::TextAntialiasing | 0x02 |
Indicates that the engine should antialias text if possible. To forcibly disable antialiasing for text, do not use this hint. Instead, set QFont::NoAntialias on your font’s style strategy. |
| QPainter::SmoothPixmapTransform | 0x04 | Indicates that the engine should use a smooth pixmap transformation algorithm (such as bilinear) rather than nearest neighbor. |
| QPainter::HighQualityAntialiasing | 0x08 | An OpenGL-specific rendering hint indicating that the engine should use fragment programs and offscreen rendering for antialiasing. |
| QPainter::NonCosmeticDefaultPen | 0x10 | The engine should interpret pens with a width of 0 (which otherwise enablesQPen::isCosmetic()) as being a non-cosmetic pen with a width of 1. |
它有几个级别和不同类型的抗锯齿。
如果我们想在我们画直线或者圆的时候，有抗锯齿的效果，可以如下设置:
画直线或者圆的时候
painter.setRenderHint( QPainter::Antialiasing, true );
painter.drawLine( m_StartPoint, m_EndPoint );
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