可能重复:
Iphone Coreplot
我想在我的iPhone应用程序中添加曲线图以供用户输入。有人可以帮我解决这个问题吗?
if(ABS(startPt.x - endPt.x) > ABS(startPt.y - endPt.y)) {
cPt1 = (CGPoint){(startPt.x + endPt.x) / 2, startPt.y};
cPt2 = (CGPoint){cPt1.x, endPt.y};
} else {
cPt1 = (CGPoint){startPt.x, (startPt.y + endPt.y) / 2};
cPt2 = (CGPoint){endPt.x, cPt1.y};