[英]Resizing images and JPanel on JFrame when JFrame get resized
[英]canvas not resizing when jframe is resized
当我调整窗口大小时,它会正确调整大小,但我用来保存图像的画布不会随之调整大小。
继承人的代码:
image = new BufferedImage(gc.width,gc.height,BufferedImage.TYPE_INT_RGB);
canvas = new Canvas();
Dimension s = new Dimension((int)(gc.width*gc.scale),(int)(gc.height*gc.scale));
canvas.setPreferredSize(s);
canvas.setMaximumSize(s);
canvas.setMinimumSize(s);
frame = new JFrame(gc.title);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(canvas,BorderLayout.CENTER);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setResizable(true);
frame.setVisible(true);
canvas.createBufferStrategy(2);
bs = canvas.getBufferStrategy();
g = bs.getDrawGraphics();
}
public void update() {
Dimension s = frame.getSize();
canvas.setPreferredSize(s);
canvas.setMaximumSize(s);
canvas.setMinimumSize(s);
g.drawImage(image,0, 0, canvas.getWidth(), canvas.getHeight(),null);
bs.show();
}
帮助表示赞赏。
你如何调用更新?
您应该实现一个 ComponentListener(或 ComponentAdapter)并将其添加到 JFrame,在 componentResized 方法中,您调用更新。 就像是:
this.addComponentListener(new ComponentAdapter(){
componentResized(ComponentEvent e){
//UPDATE YOUR CANVAS HERE
}
});
另一种方法是在您的 JFrame 中覆盖 update(Graphic):
public class MyWindow extends JFrame{
@Override
public void update(Graphics g){
super.update(g);
//UPDATE YOUR CANVAS HERE
}
}
我建议切换到 JavaFX。
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