当鼠标单击JAVA时绘制汽车
我有2D图形类绘制汽车,我真的需要帮助,使汽车出现时,我点击鼠标。这就是我目前所拥有的当鼠标单击JAVA时绘制汽车,java,jframe,graphics2d,mouselistener,Java,Jframe,Graphics2d,Mouselistener,我有2D图形类绘制汽车,我真的需要帮助,使汽车出现时,我点击鼠标。这就是我目前所拥有的 public class CarMove extends JComponent { private int lastX = 0; private int x = 1; //create the car from draw class Car car1 = new Car(x,320); public void paintComponent(Graphics g) { Graphics2D
public class CarMove extends JComponent
{
private int lastX = 0;
private int x = 1;
//create the car from draw class
Car car1 = new Car(x,320);
public void paintComponent(Graphics g)
{
Graphics2D g2 = (Graphics2D) g;
int carSpeed = 1;
int w = getWidth();
x = lastX + carSpeed;
if (x == w - 60)
{
x = x - carSpeed;
}
FrameMouseListener listener = new FrameMouseListener();
super.addMouseListener(listener);
lastX = x;
}
public class FrameMouseListener implements MouseListener
{
@Override
public void mouseClicked(MouseEvent e)
{
Graphics2D g2 = (Graphics2D) g;
car1.draw(g2);
}
}
}
当我单击框架时,我将鼠标侦听器添加到框架中汽车将出现,但我无法使其在mouseClicked事件中工作以绘制汽车您的代码应该更像:
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JComponent;
public class CarMove extends JComponent
{
private volatile boolean drawCar = false;
private int lastX = 0;
private int x = 1;
// create the car from draw class
Car car1 = new Car(x, 320);
{
FrameMouseListener listener = new FrameMouseListener();
super.addMouseListener(listener);
}
public void paintComponent(Graphics g)
{
Graphics2D g2 = (Graphics2D) g;
int carSpeed = 1;
int w = getWidth();
x = lastX + carSpeed;
if (x == w - 60)
{
x = x - carSpeed;
}
if (drawCar)
{
car1.draw(g2);
}
lastX = x;
}
public class FrameMouseListener extends MouseAdapter
{
@Override
public void mouseClicked(MouseEvent e)
{
drawCar = true;
repaint();
}
}
}
首先,您只需要在启动时添加一次侦听器。
第二,所有绘图操作都必须在绘制方法中执行,不允许存储图形对象并从代码中的任何位置向其绘图。有一个特殊的绘图线程,它可能只接触这个对象。因此,rexcipe是,设置应该绘制的内容(通过一些变量),准备绘制方法以正确使用这些变量,然后在需要刷新视图时调用repaint() 哈哈,它的工作,但汽车没有像我期望的那样移动,但谢谢老兄。我修复了一些东西,现在它可以运行了,谢谢老兄。你爸爸最好,让我开心。