weeds.java

诺基亚经典小程序。。。j2me—fishtank...(动态)

package fishtank;

import javax.microedition.lcdui.*;
import java.util.Random;

public class Weeds
{
    // These NUM values depend on the images actually included
    // in the MIDLET JAR file.
    private static final int PATTERN_NUM = 3;
    private static final int FRAME_NUM = 4;

    private static final Image[][] weedImage;
    private static final Random random = new Random();
    private static final int weedHeight, weedWidth;

    private final int weedBunches;
    private final int frame[];
    private final int pattern[];
    private final int y;

    static
    {
        weedImage = new Image[PATTERN_NUM][FRAME_NUM];

        int i = 0;
        int k = 0;
        try
        {
            for (i = 0; i < PATTERN_NUM; i ++)
            {
                for (k = 0; k < FRAME_NUM; k ++)
                {
                  weedImage[i][k] = Image.createImage("/res/weed" + i + k + ".png");
                }
            }
        }
        catch (java.io.IOException e)
        {
            weedImage[i][k] = null;
        }


        // This MIDlet implicitly assumes that all the Images
        // are the same width and height.

        weedWidth  = weedImage[0][0].getWidth();
        weedHeight = weedImage[0][0].getHeight();
    }


    public Weeds()
    {
        weedBunches = (FishTankCanvas.waterWidth - 1) / weedWidth + 1;

        pattern = new int[weedBunches];
        frame = new int[weedBunches];

        for (int i = 0; i < weedBunches; i ++)
        {
            int patternNum = Fish.rand(PATTERN_NUM);

            //the weed pattern should not be the same as previous pattern
            while ((i > 0) && patternNum == pattern[i-1])
            {
                patternNum = Fish.rand(PATTERN_NUM);
            }
            pattern[i] = patternNum;
            frame[i] = Fish.rand(FRAME_NUM);
        }

        y = FishTankCanvas.waterHeight - weedHeight + 2;
    }


    public void draw(Graphics g)
    {
        Image img = null;
        for (int i = 0; i < weedBunches; i++)
        {
            img = weedImage[pattern[i]][frame[i]];
            if (img != null)
            {
                g.drawImage(img, i * weedWidth, y, Graphics.LEFT | Graphics.TOP);
                frame[i] = (frame[i] + 1) % FRAME_NUM;
            }
        }
    }
}