drawcanvas.java

几个不错的手机程序例子

/*
 * DrawCanvas.java
 *
 * Copyright 2001 SkyArts. All Rights Reserved.
 */
import javax.microedition.lcdui.*;

/**
 * 进行低阶绘图的Canvas类
 *
 * @author  Hideki Yonekawa
 * @version 1.0
 */
class DrawCanvas extends Canvas {
	/** 储存Image对象的变量 */
	private Image	img;

	/** 构造函数 */
	DrawCanvas() {
		//取得图像
		try {
			img = Image.createImage("/mi.png");
		}catch(java.io.IOException e) {}
	}

	/** 进行描绘的方法 */
	protected void paint(Graphics g) {
		//将背景涂白
		g.setColor(0x00FFFFFF);
		g.fillRect(0, 0, getWidth(), getHeight());

		//描绘图像
		g.drawImage(img, 0, 0, Graphics.TOP|Graphics.LEFT);

		//将颜色指定为黑色
		g.setColor(0x00000000);

		//线的描绘
		g.drawLine(40, 10, 90, 10);

		//指定为虚线
		g.setStrokeStyle(Graphics.DOTTED);
		//描绘虚线
		g.drawLine(40, 20, 90, 20);

		//将虚线变回正常的线
		g.setStrokeStyle(Graphics.SOLID);

		//描绘文字
		g.drawString("Hello!", 10, 30, Graphics.TOP|Graphics.LEFT);

		//描绘四角形
		g.drawRect(10, 55, 20, 15);

		//描绘实心四角形
		g.fillRect(50, 55, 20, 15);

		//描绘圆角四角形
		g.drawRoundRect(10, 75, 20, 20, 7, 7);

		//描绘实心圆角四角形
		g.fillRoundRect(50, 75, 20, 20, 7, 7);

		//描绘圆弧
		g.drawArc(10, 100, 15, 15, 0, 300);

		//描绘实心圆弧
		g.fillArc(50, 100, 15, 15, 0, 300);
	}
}