以一定角度绘制矩形

Question

在Java中，给定以下条件的矩形是什么方法：

• 正方形中心的坐标
• 矩形与垂直线的夹角，以度为单位

Answer 1

按照建议的方式绘制矩形，您需要使用类AffineTransform。该类可用于以各种方式变换形状。要执行轮换，请使用：

int x = 200;
int y = 100;
int width = 50;
int height = 30;
double theta = Math.toRadians(45);

// create rect centred on the point we want to rotate it about
Rectangle2D rect = new Rectangle2D.Double(-width/2., -height/2., width, height);

AffineTransform transform = new AffineTransform();
transform.rotate(theta);
transform.translate(x, y); 
// it's been while, you might have to perform the rotation and translate in the
// opposite order

Shape rotatedRect = transform.createTransformedShape(rect);

Graphics2D graphics = ...; // get it from whatever you're drawing to

graphics.draw(rotatedRect);