为什么 g2d.rotate 到 90 度不完全是 90 度？爪哇

发布于 2024-11-09 03:49:20 字数 500 浏览 0 评论 0原文

您好，我正在尝试创建一个圆形文本。我设法通过循环每个旋转的字符来做到这一点。但我还是不明白。我不明白这些角度。有人可以给我一个好的解释吗？就像下面的代码一样，为什么 a 不完全是 90 度？但在 100 到 120 之间？

Graphics2D g2d = (Graphics2D)g;
    AffineTransform xform1, cxform;
    xform1 = AffineTransform.getTranslateInstance(200,200);
    g2d.setTransform(xform1);
    g2d.drawLine(0, -20, 0, 20);
    g2d.drawLine(-20, 0, 20, 0);
    xform1.rotate(Math.toDegrees(90));
    g2d.setTransform(xform1);
    g2d.drawString("a", 0, 20);

我的第一篇文章。希望我没有犯任何错误。谢谢

原文

Hi I am trying to create a circular text. I managed to do it somehow by for-looping each rotated character. But I still don't get it. I don't understand the angles. Could someone please give me a good explanation? Like in the following code why is a not exactly 90 degrees? But somewhere between 100 and 120?

Graphics2D g2d = (Graphics2D)g;
    AffineTransform xform1, cxform;
    xform1 = AffineTransform.getTranslateInstance(200,200);
    g2d.setTransform(xform1);
    g2d.drawLine(0, -20, 0, 20);
    g2d.drawLine(-20, 0, 20, 0);
    xform1.rotate(Math.toDegrees(90));
    g2d.setTransform(xform1);
    g2d.drawString("a", 0, 20);

My first post. Hope I have not made any mistakes.
Thanks

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荒人说梦 2024-11-16 03:49:20

您想要旋转 90 度，但是 rotate 采用弧度 - 因此您的转换方式是错误的。您将 90 弧度转换为度数，然后将其传递给需要弧度的值:) 试试这个：

xform1.rotate(Math.toRadians(90));

You want to rotate by 90 degrees, but rotate takes radians - so your conversion is the wrong way round. You're converting 90 radians to degrees, and then passing that to something which expects radians :) Try this: