Graphics2D将坐标改成右手系 

 1 JFrame jf = new JFrame() {
 2     public void paint(Graphics g) {
 3         super.paint(g);
 4         Graphics2D g2 = (Graphics2D) g;
 5 
 6         g2.translate(getWidth() / 2, getHeight() / 2);// 将原点平移到窗口中间
 7         g2.scale(1, -1);
 8 
 9         // AffineTransform at = new AffineTransform(1, 0, 0, -1, 0,getHeight());// 垂直翻转，这个方法也行
10         // g2.setTransform(at);
11 
12         g2.drawString("0", 0, 0);
13         g2.drawString("1", 100, 100);
14         g2.drawString("2", -100, 100);
15         g2.drawString("3", -100, -100);
16         g2.drawString("4", 100, -100);
17 
18     }
19 };
20 
21 jf.setSize(300, 300);
22 jf.setVisible(true);

 

posted @ 2017-04-06 14:26  poluner  阅读(641)  评论(0)    收藏  举报