enemy.java

本j2me坦克游戏是在Nokia平台下开发的

/*
 * @(#)Enemy.java	0.20 02/11/07
 * Copyright (c) 2002 InterScape Creations. All Rights Reserved.
 */

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

class Enemy implements Runnable {
    private static Graphics G = null;

    static Random myrandom = new Random();

	boolean alive;

    int posX, posY;

    int direction;
    int speed;
    int sp;

	boolean shootFlag;
	int bulletNo, bulletCnt;
    int bulletLevel;   //symbol the enemy's bullet speed

	Image enemyImage;
	Image drawEnemy;

	Image enemyLeft;
	Image enemyRight;
	Image enemyUp;
	Image enemyDown;

    int frameWidth, frameHeight;
    boolean ifTimer;
    int kind;
    int lifeCount = 0;
    int bulletCount;
    boolean grassPaint = false;


    Enemy() {

        ifTimer = false;
		shootFlag = false;
        bulletLevel = 0;

		direction = 0x14;	// 1--left 2--right 3--up 4--down
		// Load the object images
        try {
        	enemyImage = Image.createImage("/tank_en.png");
        	frameWidth = enemyImage.getWidth()/4;
        	frameHeight = enemyImage.getHeight();

            enemyLeft = Image.createImage(frameWidth, frameHeight);
            G = enemyLeft.getGraphics();
            G.drawImage(enemyImage, 0, 0, 20);
            enemyRight = Image.createImage(frameWidth, frameHeight);
            G = enemyRight.getGraphics();
            G.drawImage(enemyImage, -frameWidth, 0, 20);
            enemyUp = Image.createImage(frameWidth, frameHeight);
            G = enemyUp.getGraphics();
            G.drawImage(enemyImage, -frameWidth*2, 0, 20);
            enemyDown = Image.createImage(frameWidth, frameHeight);
            G = enemyDown.getGraphics();
            G.drawImage(enemyImage, -frameWidth*3, 0, 20);

            G = null;
           	drawEnemy = enemyDown;
        }
        catch(Exception exception) {
            System.out.println(exception);
        }
    }

    //add by johnson to make all kinds of tankers
    //kind: 0-ordinary tanker, 1-red tanker, 2-iron tanker, 3-clever tanker
    public Enemy(int kind) {
        this.kind = kind;
        frameWidth = ImageHelper.frameWidth;
        frameHeight = ImageHelper.frameHeight;
        switch(kind){
            case 0:
             //   System.out.println("normal tanker");
                speed = SuperTank.canvas.tileW/2;
                sp = speed;
                shootFlag = false;
                bulletCount = 50;
                bulletLevel = 0;
                direction = 0x14; // 1--left 2--right 3--up 4--down
                // Load the object images
               /* try {
                    enemyImage = Image.createImage("/tank_en.png");
                }
                catch (Exception exception) {
                    System.out.println(exception);
                }*/
               enemyLeft = ImageHelper.enemyLeft;
               enemyRight = ImageHelper.enemyRight;
               enemyUp = ImageHelper.enemyUp;
               enemyDown = ImageHelper.enemyDown;

                break;
            case 1:   //red tanker
                speed = SuperTank.canvas.tileW/2;
                sp = speed;
                shootFlag = false;
                bulletLevel = 0;
                bulletCount = 25;
                direction = 0x14; // 1--left 2--right 3--up 4--down
                // Load the object images
               /* try {
                    enemyImage = Image.createImage("/redtank.png");
                }
                catch (Exception exception) {
                    System.out.println(exception);
                }*/
              enemyLeft = ImageHelper.enemyLeftRed;
              enemyRight = ImageHelper.enemyRightRed;
              enemyUp = ImageHelper.enemyUpRed;
              enemyDown = ImageHelper.enemyDownRed;

                break;
            case 2:   //iron tanker
             //   System.out.println("iron tanker");
                speed = SuperTank.canvas.tileW/2;
                sp = speed;
                shootFlag = false;
                bulletLevel = 0;
                bulletCount = 50;
                lifeCount = 3;
                direction = 0x14; // 1--left 2--right 3--up 4--down
                // Load the object images
                /*try {
                    enemyImage = Image.createImage("/greentank.png");
                }
                catch (Exception exception) {
                    System.out.println(exception);
                }*/
               enemyLeft = ImageHelper.enemyLeftIron;
                enemyRight = ImageHelper.enemyRightIron;
                enemyUp = ImageHelper.enemyUpIron;
                enemyDown = ImageHelper.enemyDownIron;


                break;
            case 3:
                speed = SuperTank.canvas.tileW/2;
                sp = speed;
                shootFlag = false;
                bulletLevel = 0;
                bulletCount = 15;
                direction = 0x14; // 1--left 2--right 3--up 4--down
                // Load the object images
                /*try {
                    enemyImage = Image.createImage("/tank_en.png");
                }
                catch (Exception exception) {
                    System.out.println(exception);
                }*/
                enemyLeft = ImageHelper.enemyLeft;
                enemyRight = ImageHelper.enemyRight;
                enemyUp = ImageHelper.enemyUp;
                enemyDown = ImageHelper.enemyDown;

                break;
            default:
                break;
        }
        drawEnemy = enemyDown;

       /* try {
            frameWidth = enemyImage.getWidth() / 4;
            frameHeight = enemyImage.getHeight();

            enemyLeft = Image.createImage(frameWidth, frameHeight);
            G = enemyLeft.getGraphics();
            G.drawImage(enemyImage, 0, 0, 20);
            enemyRight = Image.createImage(frameWidth, frameHeight);
            G = enemyRight.getGraphics();
            G.drawImage(enemyImage, -frameWidth, 0, 20);
            enemyUp = Image.createImage(frameWidth, frameHeight);
            G = enemyUp.getGraphics();
            G.drawImage(enemyImage, -frameWidth * 2, 0, 20);
            enemyDown = Image.createImage(frameWidth, frameHeight);
            G = enemyDown.getGraphics();
            G.drawImage(enemyImage, -frameWidth * 3, 0, 20);

            G = null;
            drawEnemy = enemyDown;
        }
        catch (Exception exception) {
            System.out.println(exception);
        }*/
    }

   /* public void setProperty(int kind){

    }*/


	public void run() {
	}

    synchronized void paint(Graphics g) {
    	int fillposX = posX;
    	int fillposY = posY;
    	int fillwidth, fillheigh;
		int i;

    	fillwidth = frameWidth;
    	fillheigh = frameHeight;

		if(!ifTimer){
            if (!shootFlag && ( (myrandom.nextInt() & 2) == 0) &&
                (bulletCnt == 0)) {
                shootFlag = true;
                i = 0;
                for (i = 1; i < SuperTank.canvas.maxBullet; i++) {
                    if (SuperTank.canvas.bulletAlive[i] == false)
                        break;
                }
                if ( (i > 0) && (i < SuperTank.canvas.maxBullet)) {
                    bulletCnt = bulletCount;
                    bulletNo = i;
                    SuperTank.canvas.fireBullet(bulletNo, direction, posX, posY, 3);
                }
            }
        }

		if ( bulletCnt > 0 )
			bulletCnt --;


        grassPaint = false;
        if (ismapCollide())
			direction = tankAI();




		g.setColor(0x0);
        //add by johnson to set the timer
        if(ifTimer){
            speed = 0;
        }else{
            speed = sp;
        }

		switch(direction & 0x0f) {
	        case 1:		//left
		        if ((posX > SuperTank.canvas.mapOffsetX) && !ismapCollide()){
			        posX -= speed;
		        	fillposX = posX + frameWidth;
		        	fillposY = posY;
		        	fillwidth = speed;
		        	fillheigh = frameHeight;
		        }

		   		break;

	        case 2:		//right
		        if ((posX < (SuperTank.canvas.mapOffsetX+SuperTank.canvas.mapWidth - frameWidth)) && !ismapCollide()){
			        posX += speed;
		        	fillposX = posX - speed;
		        	fillposY = posY;
		        	fillwidth = speed;
		        	fillheigh = frameHeight;
		        }

	            break;

	        case 3:		//up
		        if ((posY > SuperTank.canvas.mapOffsetY) && !ismapCollide()){
			        posY -= speed;
		        	fillposX = posX;
		        	fillposY = posY + frameHeight;
		        	fillwidth = frameWidth;
		        	fillheigh = speed;
		        }

    	        break;

	        case 4:		//down
		        if ((posY<(SuperTank.canvas.mapOffsetY+SuperTank.canvas.mapHeight - frameHeight)) && !ismapCollide()){
			        posY += speed;
		        	fillposX = posX;
		        	fillposY = posY - speed;
		        	fillwidth = frameWidth;
		        	fillheigh = speed;
		        }

	        default:
	            break;
		}

		g.fillRect(fillposX, fillposY, fillwidth, fillheigh);
//        DirectGraphics dg = DirectUtils.getDirectGraphics(g);
        switch(direction & 0x0f) {
            case 1:		//left
//              dg.drawImage(drawEnemy, posX, posY, g.TOP|g.LEFT, DirectGraphics.ROTATE_90);
              g.drawImage(enemyLeft, posX, posY, g.TOP|g.LEFT);
                break;

            case 2:		//right
//              dg.drawImage(drawEnemy, posX, posY, g.TOP|g.LEFT, DirectGraphics.ROTATE_270);
              g.drawImage(enemyRight, posX, posY, g.TOP|g.LEFT);
                break;

            case 3:		//up
//              g.drawImage(drawEnemy, posX, posY, g.TOP|g.LEFT);
              g.drawImage(enemyUp, posX, posY, g.TOP|g.LEFT);
                break;

            case 4:		//down
//              dg.drawImage(drawEnemy, posX, posY, g.TOP|g.LEFT, DirectGraphics.ROTATE_180);