Quartz2D简单绘制之饼状图

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// 画扇形
// 红色部分
    CGContextRef contextRef = UIGraphicsGetCurrentContext();
    CGFloat    components[] = { 1.0f, 0.0f, 0.0f, 1.0f};
    CGContextSetFillColor(contextRef, components);
    CGContextMoveToPoint(contextRef, 150.0f, 150.0f);
    CGContextAddArc(contextRef, 150.0f, 150.0f, 100.0f, 0 * (M_PI / 180.0f), 120 * (M_PI / 180.0f), 0);
    CGContextFillPath(contextRef);
// 绿色部分
    CGFloat    blueComponents[] = { 0.0f, 1.0f, 0.0f, 1.0f};
    CGContextSetFillColor(contextRef, blueComponents);
    CGContextMoveToPoint(contextRef, 150.0f, 150.0f);
    CGContextAddArc(contextRef, 150.0f, 150.0f, 100.0f, 120 * (M_PI / 180.0f), 200 * (M_PI / 180.0f), 0);
    CGContextFillPath(contextRef);