java围绕中心旋转矩形 [英] java rotate rectangle around the center

问题描述

我想围绕其中心点旋转一个矩形，它应该保留在它应该绘制的位置并在该空间中旋转

I would like to rotate a rectangle around its center point and it should remain in the place that it is supposed be drawn and rotate in that space

这是我的代码：

AffineTransform transform = new AffineTransform();

    transform.rotate(Math.toRadians(45),rectangle.width/2, rectangle.height/2);
    Shape transformed = transform.createTransformedShape(rectangle);
    g2.fill(transformed)

该矩形被旋转，但它被绘制在一个不同的屏幕的一部分，我该如何解决这个问题？

the rectangle is rotated but it is drawn at a different part of the screen, how can I correct this?

推荐答案

我还没有试过这个，但看起来你不是获得矩形的正确中间。尝试：

I haven't tried this, but it seems you aren't getting the correct middle of the rectangle. Try:

AffineTransform transform = new AffineTransform();
transform.rotate(Math.toRadians(45), rectangle.getX() + rectangle.width/2, rectangle.getY() + rectangle.height/2);
g2.fill(transformed);

现在，您将宽度添加到起始X点并将高度添加到开始Y点，因此矩形的中间。

The difference is now you're adding the width to the starting X point and adding the height to the starting Y point, hence the middle of the rectangle.

希望这有助于。

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