下面我将分享用Java制作简易画图板的过程。

version 1

Draw.java

Java代码

importjavax.swing.JFrame;

/**

*

* @author yangzhenlin

*

*/

publicclassDrawextendsJFrame {

publicvoidinitDraw() {

this.setTitle("画图板");

this.setSize(600,500);

this.setDefaultCloseOperation(3);

this.setVisible(true);

/**

* 从窗体上获取画布对象 获取窗体在屏幕上占据的区域，这块区域是允许改变颜色的。

*/

java.awt.Graphics g =this.getGraphics();

DrawListener dlis =newDrawListener(g);

this.addMouseListener(dlis);

}

}

import javax.swing.JFrame;

/**

*

* @author yangzhenlin

*

*/

public class Draw extends JFrame {

public void initDraw() {

this.setTitle("画图板");

this.setSize(600, 500);

this.setDefaultCloseOperation(3);

this.setVisible(true);

/**

* 从窗体上获取画布对象 获取窗体在屏幕上占据的区域，这块区域是允许改变颜色的。

*/

java.awt.Graphics g = this.getGraphics();

DrawListener dlis = new DrawListener(g);

this.addMouseListener(dlis);

}

}

DrawListener.java

Java代码

importjava.awt.event.MouseEvent;

/**

*

* @author yangzhenlin

*

*/

/**

* 画板监听器，实现鼠标监听器接口

*/

publicclassDrawListenerimplementsjava.awt.event.MouseListener {

// private int x1, x2, y1, y2;

privatejava.awt.Graphics g;

publicDrawListener(java.awt.Graphics g) {

this.g = g;

}

publicvoidmouseClicked(MouseEvent e) {

System.out.println("mouseClicked");

}

publicvoidmousePressed(MouseEvent e) {

System.out.println("mousePressed");

}

publicvoidmouseReleased(MouseEvent e) {

System.out.println("mouseReleased");

}

publicvoidmouseEntered(MouseEvent e) {

System.out.println("mouseEntered");

}

publicvoidmouseExited(MouseEvent e) {

System.out.println("mouseExited");

}

}