对象旋转不正确 - iPhone 应用程序

发布于 2024-12-07 19:46:55 字数 1797 浏览 0 评论 0原文

我在旋转物体时遇到了一个典型的问题。说明如下
我已经采取了两个 CGPoint 比如说 point1 和 point2
点1 = (50,50)
点2 = (150, 50)
该点将画一条水平线。

现在我正在画一个矩形，上面有那个点。宽度为 100，高度为 10。角度为 0。
参见屏幕截图
在此处输入图像描述

工作正常
现在我改变一下观点
点1 = (50,50)
点2 = (50,150)
该点将绘制一条垂直线。

对于矩形角度为 90。
此时矩形无法正确绘制
请参阅屏幕截图
在此处输入图像描述

我绘制矩形的代码是：

    CGPoint mid = CGPointMake((point1.x+point2.x)/2, (point1.y+point2.y)/2)
    CGPoint UL = CGPointMake(mid.x + ( Width / 2 ) * cos (A) - ( Height / 2 ) * sin (A) ,  mid.y + ( Height / 2 ) * cos (A)  + ( Width / 2 ) * sin (A));
    CGContextMoveToPoint(context, UL.x,routeView.frame.size.height - UL.y);
    CGPoint UR = CGPointMake(mid.x - ( Width / 2 ) * cos (A) - ( Height / 2 ) * sin (A) ,  mid.y + ( Height / 2 ) * cos (A)  - ( Width / 2 ) * sin (A));
    CGContextAddLineToPoint(context, UR.x,routeView.frame.size.height - UR.y);
    CGPoint BR = CGPointMake(mid.x - ( Width / 2 ) * cos (A) + ( Height / 2 ) * sin (A) ,  mid.y - ( Height / 2 ) * cos (A)  - ( Width / 2 ) * sin (A));
    CGContextAddLineToPoint(context, BR.x,routeView.frame.size.height - BR.y);
    CGPoint BL = CGPointMake(mid.x + ( Width / 2 ) * cos (A) + ( Height / 2 ) * sin (A) ,  mid.y - ( Height / 2 ) * cos (A)  + ( Width / 2 ) * sin (A));
    CGContextAddLineToPoint(context, BL.x,routeView.frame.size.height - BL.y);
    CGContextAddLineToPoint(context, UL.x,routeView.frame.size.height - UL.y);

    CGContextStrokePath(context);

这里 A 是角度，它不是静态的，中间是point1 和 point2 的中间点

以获取更多参考查看此

我错过了什么吗？如果您有任何想法，请帮助我......

谢谢，

原文

I am facing a typical problem in rotating an object. Description is as given below
I have taken two CGPoint let say point1 and point2
point1 = (50,50)
point2 = (150, 50)
this point will draw a horizontal line.

Now i am drawing a rectangle with that point on it. Width is 100 and height is 10. Angle is 0.
see screen shot
enter image description here

works fine
now i change the point let say
point1 = (50,50)
point2 = (50,150)
this point will draw a vertical line.

For rectangle Angle is 90.
With this point rectangle is not drawing properly
see screen shot
enter image description here

My code for drawing rectangle is :

    CGPoint mid = CGPointMake((point1.x+point2.x)/2, (point1.y+point2.y)/2)
    CGPoint UL = CGPointMake(mid.x + ( Width / 2 ) * cos (A) - ( Height / 2 ) * sin (A) ,  mid.y + ( Height / 2 ) * cos (A)  + ( Width / 2 ) * sin (A));
    CGContextMoveToPoint(context, UL.x,routeView.frame.size.height - UL.y);
    CGPoint UR = CGPointMake(mid.x - ( Width / 2 ) * cos (A) - ( Height / 2 ) * sin (A) ,  mid.y + ( Height / 2 ) * cos (A)  - ( Width / 2 ) * sin (A));
    CGContextAddLineToPoint(context, UR.x,routeView.frame.size.height - UR.y);
    CGPoint BR = CGPointMake(mid.x - ( Width / 2 ) * cos (A) + ( Height / 2 ) * sin (A) ,  mid.y - ( Height / 2 ) * cos (A)  - ( Width / 2 ) * sin (A));
    CGContextAddLineToPoint(context, BR.x,routeView.frame.size.height - BR.y);
    CGPoint BL = CGPointMake(mid.x + ( Width / 2 ) * cos (A) + ( Height / 2 ) * sin (A) ,  mid.y - ( Height / 2 ) * cos (A)  + ( Width / 2 ) * sin (A));
    CGContextAddLineToPoint(context, BL.x,routeView.frame.size.height - BL.y);
    CGContextAddLineToPoint(context, UL.x,routeView.frame.size.height - UL.y);

    CGContextStrokePath(context);

Here A is Angle and it is not static, mid is middle point of point1 and point2

for more ref see this

Am I missing something?
Please help me if you have any idea.......

Thanks,

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