本文来自：http://blog.csdn.net/hellogv/ ，转载必须注明出处！
首先先给出本例的效果图：
OK,先给出调用绘图功能的代码：
首先先给出本例的效果图：
首先，需要说明一下LWUIT的控件：
LWUIT的控件，可以算是做得很全，他的设计模式跟J2SE有点类似，而做过J2ME的人要掌握也不需要长时间。LWUIT的控件，是原来高级控件与低级控件的集合，并加入了更多元素，因此你可以在用高级控件的同时，很自然地实现低级控件的功能。例如本文中的绘图功能，就是如此！
在本例中，依然使用大家熟悉的void paint(Graphics g)
函数，作为绘图的主体，然而paint的“上司”(绘图类)并不再是继承Canvas，而是继承Component，并且继承Component之后要这
样被调用：form.addComponent(BorderLayout.CENTER, new Painting());//
OK,先给出调用绘图功能的代码：
- private class ButtonActionListener implements ActionListener {
- public void actionPerformed(ActionEvent evt) {
- String sel_button=((Button)(evt.getSource())).getText();//取得所选按钮的名称
- if(sel_button.equals("Image 1"))
- new AnimationDemo().form.show();
- else if(sel_button.equals("Image 2"))
- new PaintingDemo().form.show();
- }
- }
接着再给出绘图功能实现的代码：
- /*
- * Copyright ?2008 Sun Microsystems, Inc. All rights reserved.
- * Use is subject to license terms.
- *
- */
- package com.sun.lwuit.uidemo;
- import com.sun.lwuit.Command;
- import com.sun.lwuit.Component;
- import com.sun.lwuit.Form;
- import com.sun.lwuit.Graphics;
- import com.sun.lwuit.events.ActionEvent;
- import com.sun.lwuit.events.ActionListener;
- import com.sun.lwuit.layouts.BorderLayout;
- /**
- * Demonstrates simple animation both static and manual
- *
- * @author Shai Almog
- */
- public class PaintingDemo extends Form implements ActionListener {
- public Form form = new Form("PaintingDemo");
- private Command backCommand = new Command("Back", 1);
- private Command nextCommand = new Command("next", 2);
- PaintingDemo()
- {
- form.addCommand(backCommand);
- form.addCommand(nextCommand);
- form.setCommandListener(this);
- form.setLayout(new BorderLayout());
- form.addComponent(BorderLayout.CENTER, new Painting());
- }
- public class Painting extends Component{
- private int w;
- public void paint(Graphics g) {
- g.setColor(0x000000);
- g.fillRect(0, 0, this.getWidth(), this.getHeight());
- w = getWidth();
- drawSqrt1(g);
- g.setColor(0xffffff);
- g.drawString("hellogv", 12, 33);
- }
- private void drawSqrt1(Graphics g) {
- long start = System.currentTimeMillis();
- int centerY1 = 50;
- //绘制X轴
- //设置绘图颜色为蓝色
- g.setColor(0x0000FF);
- g.drawLine(0, centerY1, w, centerY1);
- //设置绘图颜色为白色
- g.setColor(0xFFFFFF);
- int oldX = 0;
- int oldY1 = centerY1;
- int y1;
- for(int i=1;i<w;i++) {
- // 放大3倍
- y1 = centerY1 - (int)(3*Math.sqrt(i));
- g.drawLine(oldX, oldY1, i, y1);
- oldX = i;
- oldY1 = y1;
- }
- long time = System.currentTimeMillis() - start;
- System.out.println("drawSqrt1 Runtime: " + time);
- }
- }
- public void actionPerformed(ActionEvent arg0) {
- if(arg0.getCommand()==backCommand)
- {
- UIDemoMIDlet.backToMainMenu();
- }
- else if(arg0.getCommand()==nextCommand)
- {
- }
- }
- }
OK，还是那句，希望大家多多支持LWUIT，让它可以做得更加好！