我有一个小程序,我通过重写paint()方法来绘制东西,并向该小程序添加了一个Canvas,它将占据整个屏幕。这个 Canvas 似乎是在我的paint()之后绘制的,所以我的小程序的paint()的东西是不可见的。关于如何在小程序上的绘制方法之前强制绘制 Canvas 有什么想法吗?
编辑:
public void paint(Graphics g) {
super.paint(g);
if (DEBUG) {
g.setColor(Color.red);
g.drawString("Memory free: " + ((Runtime.getRuntime().freeMemory()
/ 1024) / 1024) + "MB", 5, 20);
g.drawString("Memory total: " + ((Runtime.getRuntime().totalMemory()
/ 1024) / 1024) + "MB", 5, 35);
g.drawString("Memory used: " + (((Runtime.getRuntime().totalMemory()
- Runtime.getRuntime().freeMemory()) / 1024) / 1024) + "MB", 5, 50);
}
}
最佳答案
即使您必须使用 AWT,您也应该能够使用单独的 Panel
来显示 GL 内容和内存状态:
import java.awt.*;
import java.awt.event.*;
public class AWTPaintTest {
public static void main(String[] args) {
Frame frame = new Frame();
// frame.add(new AWTGLCanvas(), BorderLayout.CENTER);
frame.add(new MemoryPanel(), BorderLayout.SOUTH);
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
frame.pack();
frame.setVisible(true);
}
private static class MemoryPanel extends Panel {
private final Runtime r = Runtime.getRuntime();
public MemoryPanel() {
this.setPreferredSize(new Dimension(240, 120));
this.setForeground(Color.blue);
this.setFont(new Font("Monospaced", Font.BOLD, 16));
this.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
r.gc();
MemoryPanel.this.repaint();
}
});
}
@Override
public void paint(Graphics g) {
super.paint(g);
long m = r.maxMemory();
long t = r.totalMemory();
long f = r.freeMemory();
int y = g.getFontMetrics().getHeight() + 4;
g.drawString("Memory max: " + toMB(m), 5, 1 * y);
g.drawString("Memory total: " + toMB(t), 5, 2 * y);
g.drawString("Memory free: " + toMB(f), 5, 3 * y);
g.drawString("Memory used: " + toMB(t - f), 5, 4 * y);
g.drawString("Click to update.", 5, 5 * y);
}
private String toMB(long bytes) {
return (bytes / 1024) / 1024 + " MB";
}
}
}
关于Java AWT 重量级 Canvas ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/3900973/