我正在使用 Swing 的 JPanel
扩展作为绘图界面,用 Java 制作一个小游戏。
我在面板的paintComponent()
内绘制所有内容
游戏运行得很顺利,直到我开始移动鼠标。当我这样做时,我的 FPS 会大幅下降,尤其是当我移动速度非常快时,导致游戏无法玩。 即使我停止绘制鼠标光标,也会发生这种情况。
在 JComponent
对象上绘图时这是正常的吗?
附注我在任何组件上都找不到任何已注册的 MouseListener
或 MouseMotionListener
对象。
编辑:
MCVE
import java.awt.*;
import java.awt.event.ActionEvent;
import javax.swing.*;
public class AnimationSlowDownOnMouse {
public static void main(String[] args) {
// TODO Auto-generated method stub
JFrame mainWindow = new JFrame("dotShoot");
mainWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainWindow.setExtendedState(JFrame.MAXIMIZED_BOTH);
final GamePanel gp = new GamePanel();
gp.setPreferredSize(new Dimension(1920, 1080));
mainWindow.add(gp);
mainWindow.pack();
gp.init();
Thread gameThread = new Thread(new Runnable() {
@Override
public void run() {
final int maxTicksPerSecond = 100;
final int optimalTimePerTick = 1000 / maxTicksPerSecond;
final int maxFrameSkips = 5;
long tickCount = 0L;
float AvgIES = 0f;
//int FPS = 0;
int DCPS = 0;
int TPS = 0;
long timeStarted = System.currentTimeMillis();
long timeElapsed = 0L;
int tickReset = 0;
int drawCallsReset = 0;
long timeReset = timeStarted;
float interpolationReset = 0f;
long nextLoop = timeStarted;
int frameSkips = 0;
float interpolation;
while (true) {
synchronized (this) {
frameSkips = 0;
while (System.currentTimeMillis() > nextLoop && frameSkips < maxFrameSkips) {
gp.update(tickCount);
nextLoop += optimalTimePerTick;
tickCount++;
tickReset++;
frameSkips++;
}
interpolation = (float) (System.currentTimeMillis() + optimalTimePerTick - nextLoop) / (float) optimalTimePerTick;
gp.setInterpolation(interpolation);
gp.repaint();
interpolationReset += interpolation;
drawCallsReset++;
timeElapsed = System.currentTimeMillis() - timeStarted;
if (System.currentTimeMillis() - timeReset >= 1000) {
AvgIES = interpolationReset / (float) drawCallsReset;
interpolationReset = 0f;
TPS = tickReset;
tickReset = 0;
DCPS = drawCallsReset;
drawCallsReset = 0;
timeReset = System.currentTimeMillis();
}
}
}
}
});
gameThread.start();
mainWindow.setVisible(true);
gp.requestFocus();
}
}
class GamePanel extends JPanel {
/**
*
*/
private static final long serialVersionUID = 3110478596996378903L;
public GamePanel() {
this.getInputMap().put(KeyStroke.getKeyStroke("pressed A"), "pressed Key");
this.getInputMap().put(KeyStroke.getKeyStroke("released A"), "released Key");
this.getInputMap().put(KeyStroke.getKeyStroke("pressed D"), "pressed Key");
this.getInputMap().put(KeyStroke.getKeyStroke("released D"), "released Key");
this.getInputMap().put(KeyStroke.getKeyStroke("pressed W"), "pressed Key");
this.getInputMap().put(KeyStroke.getKeyStroke("released W"), "released Key");
this.getInputMap().put(KeyStroke.getKeyStroke("pressed S"), "pressed Key");
this.getInputMap().put(KeyStroke.getKeyStroke("released S"), "released Key");
this.getActionMap().put("pressed Key", new AbstractAction() {
private static final long serialVersionUID = 1296609706338138539L;
@Override
public void actionPerformed(ActionEvent arg0) {
if (!pks.contains(arg0.getActionCommand())) {
pks += arg0.getActionCommand() + ", ";
}
}
});
this.getActionMap().put("released Key", new AbstractAction() {
private static final long serialVersionUID = 4364732373538162119L;
@Override
public void actionPerformed(ActionEvent arg0) {
pks = pks.replace(arg0.getActionCommand() + ", ", "");
}
});
this.setBackground(new Color(0x6495ed));
}
public void init() {
}
private String pks = "";
public void update(long currentTick) {
}
private float interpolation = 0;
public void setInterpolation(float interpolation) {
this.interpolation = interpolation;
}
private int frames = 0;
private long timeForFPS = 0;
private int ActualFPS = 0;
public int getFPS() {
return ActualFPS;
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.black);
g.drawString("FPS: " + ActualFPS, 0, 10);
frames++;
if (System.currentTimeMillis() - timeForFPS >= 1000) {
ActualFPS = frames;
frames = 0;
timeForFPS = System.currentTimeMillis();
}
}
}
<小时/>
编辑2:
http://tinypic.com/r/9bkf4k/8
http://tinypic.com/r/345m24i/8
最佳答案
与其他评论一样,当我在我的计算机上尝试上面的代码时,FPS 没有问题。我还在只有一个处理器的虚拟机上尝试过。当鼠标快速移动时,FPS 仍然没有显着下降。虽然处理器总是显示100%的使用率。您在其他计算机上尝试过此操作吗?我怀疑,你也不会在那里看到 FPS 问题。因此,问题可能出在您的计算机上,而不是您的程序代码上。
关于java - 移动鼠标时 JPanel FPS 下降,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31660930/