Question

我的目标是得到这样的结果： enter image description here

灰线是鼠标跟随的路径，黑线是您在屏幕上看到的线条，但我有两个问题

新行之前的行消失了（我想留下来）

线条绘制是滞后的，只有当我的鼠标是静态时才会绘制

public class Press extends Applet实现MouseMotionListener {

public int count;
public int x1, y1, x2, y2;

public void init(){
    this.addMouseMotionListener(this);
}

public Press(){
    count = 0;
}

public void paint (Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    g2.draw(new Line2D.Double(x1, y1, x2, y2));
    repaint();
}

    public void clickup(){
    count++;
    }

    public void mouseDragged(MouseEvent e){
    x1 = x2;
    y1 = y2;
    x2 = e.getX();
    y2 = e.getY();
    System.out.println("x: " + x2 + " y: " + y2 + " Count: " + count);
    clickup();
    try {
        Thread.sleep(100);
    } catch (InterruptedException e1) {
        e1.printStackTrace();
    }

    }

    public void mouseMoved(MouseEvent e) {
    }

public static void main(String[] args) {
    Press mouse = new Press();
    }

}

Answer 1

执行此操作的方法是使用（缓冲）图像，在绘画中绘制图像，以及在鼠标事件处理程序中绘制图像。 Here is an example

绘图线与睡眠命令滞后

1 个答案: