CGContextAddArcToPoint和CGContextAddArc
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CGContextRef context=UIGraphicsGetCurrentContext(); //设置线颜色(1.0.0)CGContextSetRGBStrokeColor(context,1,0,0,1); //从(150,50)到(100,80)画一条线,然后再从(100,80)到(130,150)画一条线,从这两条线(无限延伸的) 和半径50可以确定一条弧CGContextMoveToPoint(context,150,50); CGContextAddLineToPoint(context,100,80); CGContextAddLineToPoint(context,130,150); CGContextMoveToPoint(context,150,50);//圆弧的起始点 CGContextAddArcToPoint(context,100,80,130,150,50); CGContextStrokePath(context);
CGContextAddArc(context, 100, 100, 30, 0, M_PI, 1);以(100,100)为圆心的坐标,30为半径,(0,M_PI)为起始角度和结束角度,1为顺时针,0 为逆时针
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CGContextAddArcToPoint和CGContextAddArc
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