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.*;
import java.util.*;

/**
 * 进行描绘的类
 *
 * @author  Hideki Yonekawa
 * @version 1.0
 */
class DrawCanvas extends Canvas {

	/**
	 * 进行描绘的方法。通常不会由自己类直接调用
	 * @param	g	Graphics对象
	 */
	protected void paint(Graphics g) {
		int screenWidth = getWidth();
		int screenHeight = getHeight();
		//在背景清除黑色
		g.setColor(0x00FFFFFF);
		g.fillRect(0, 0, screenWidth, screenHeight);

		String drawSt = "Hello!";
		int centerX = screenWidth /2;
		int drawY = 0;
		int fontHeight = Font.getDefaultFont().getHeight();

		//BOTTOM | LEFT
		drawY = drawY + fontHeight;
		g.setColor(0x00FF0000);
		g.drawLine(0, drawY, screenWidth, drawY);
		g.setColor(0x00000000);
		g.drawString(drawSt, centerX, drawY, Graphics.BOTTOM|Graphics.LEFT);

		//BOTTOM | RIGHT
		drawY = drawY + fontHeight;
		g.setColor(0x00FF0000);
		g.drawLine(0, drawY, screenWidth, drawY);
		g.setColor(0x00000000);
		g.drawString(drawSt, centerX, drawY, Graphics.BOTTOM|Graphics.RIGHT);

		//BOTTOM | HCENTER
		drawY = drawY + fontHeight;
		g.setColor(0x00FF0000);
		g.drawLine(0, drawY, screenWidth, drawY);
		g.setColor(0x00000000);
		g.drawString(drawSt, centerX, drawY, Graphics.BOTTOM|Graphics.HCENTER);

		//TOP | LEFT
		drawY = drawY + fontHeight;
		g.setColor(0x00FF0000);
		g.drawLine(0, drawY, screenWidth, drawY);
		g.setColor(0x00000000);
		g.drawString(drawSt, centerX, drawY, Graphics.TOP|Graphics.LEFT);

		//TOP | RIGHT
		drawY = drawY + fontHeight;
		g.setColor(0x00FF0000);
		g.drawLine(0, drawY, screenWidth, drawY);
		g.setColor(0x00000000);
		g.drawString(drawSt, centerX, drawY, Graphics.TOP|Graphics.RIGHT);

		//TOP | HCENTER
		drawY = drawY + fontHeight;
		g.setColor(0x00FF0000);
		g.drawLine(0, drawY, screenWidth, drawY);
		g.setColor(0x00000000);
		g.drawString(drawSt, centerX, drawY, Graphics.TOP|Graphics.HCENTER);

		//BASELINE | LEFT
		drawY = drawY + fontHeight;
		g.setColor(0x00FF0000);
		g.drawLine(0, drawY, screenWidth, drawY);
		g.setColor(0x00000000);
		g.drawString(drawSt, centerX, drawY, Graphics.BASELINE|Graphics.LEFT);

		//BASELINE | RIGHT
		drawY = drawY + fontHeight;
		g.setColor(0x00FF0000);
		g.drawLine(0, drawY, screenWidth, drawY);
		g.setColor(0x00000000);
		g.drawString(drawSt, centerX, drawY, Graphics.BASELINE|Graphics.RIGHT);

		//BASELINE | HCENTER
		drawY = drawY + fontHeight;
		g.setColor(0x00FF0000);
		g.drawLine(0, drawY, screenWidth, drawY);
		g.setColor(0x00000000);
		g.drawString(drawSt, centerX, drawY, Graphics.BASELINE|Graphics.HCENTER);
	}
}