java翻译矩形2D

Question

I want to translate a rectangle 2D using a double x and double y. It seems that rectangle2D does not support the translate method. What is the appropriate method to use?

Answer 1

If you need it to remain a Rectangle2D, you might have to write your own custom method that just adds to the x and y.

You can also perform arbitrary transformations with an AffineTransform, but this will turn it into a generic Shape (since that transformation might make it no longer rectangular).

AffineTransform at = AffineTransform.getTranslateInstance(tx, ty);
Shape transformed = at.createTransformedShape(rectangle);

Answer 2

You have to cast the old Graphics variable to Graphics2D which has double methods. Mostly double parameters are used.

@Override
public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    g.translate(3.0, 4.0);

Double rectangles are not available in Graphics2D (like in drawRect ). They are available however for own programming as java.awt.geom.Rectangle2D.Double .