drawgrbcanvas.java

J2ME手机游戏开发技术详解,适合初学者阅读使用

package DrawGRB;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import java.io.*;
public class DrawGRBCanvas extends Canvas
{
	private int[] pixelArray;
	public DrawGRBCanvas()
        {
    
        }
        public void paint(Graphics g)
        {
        g.setColor(0xFFFF00);
	g.fillRect(0, 0, this.getWidth(), this.getHeight());
	
	     
	int x = 0, y = 0; // Where on the display to draw the image
	int width = 35, height = 35; // Size of the image
	// Define the array for image
	if(pixelArray == null)
	pixelArray = new int[width * height];
	// Create a fully opaque image, specifying only a value for red
	for(int i = 0; i < pixelArray.length; i++)
	pixelArray[i] = 0xffff0000;
	g.drawRGB(pixelArray, 0, width, x, y, width, height, false);
	g.drawRect(x, y, width, height); // Box the rectangle
	// Create a “half” opaque image, specifying only a value for red
	x = 35;
	y = 35;
	for(int i = 0; i < pixelArray.length; i++)
	pixelArray[i] = 0x7fff0000;
	g.drawRGB(pixelArray, 0, width, x, y, width, height, true);
	g.drawRect(x, y, width, height); // Box the rectangle
	x = 70;
	y = 70;
	// Create a fully transparent image, specifying only a value for red
	for(int i = 0; i < pixelArray.length; i++)
	pixelArray[i] = 0x00ff0000;
	g.drawRGB(pixelArray, 0, width, x, y, width, height, true);
	g.drawRect(x, y, width, height); // Box the rectangle
        }
}