enemy.java

本j2me坦克游戏是在Nokia平台下开发的

              g.drawImage(enemyDown, posX, posY, g.TOP|g.LEFT);
            default:
                break;
        }
        if(grassPaint){
            SuperTank.canvas.grassPaint = true;
            //    SuperTank.canvas.reDraw(3,g);
        }

    }

    boolean ismapCollide() {
    	boolean collFlag = false;
    	int collX, collY;
    	int i;
    	int tileW = SuperTank.canvas.tileW;

		collX = posX-SuperTank.canvas.mapOffsetX;
		collY = posY-SuperTank.canvas.mapOffsetY;

		switch(direction & 0x0f) {
	        case 1:		//left
	        	collX = collX - speed;
		        if ( collX <= 0 )
		        	collFlag = true;
		        else {
		        	collFlag = false;
		        	for ( i = (collY/tileW * (SuperTank.canvas.mapWidth/tileW) + collX/tileW); i <= ((collY + frameHeight)/tileW * (SuperTank.canvas.mapWidth/tileW) + collX/tileW); i += (SuperTank.canvas.mapWidth/tileW) ){
                        if (SuperTank.canvas.mapInfo[i] == 3) {
                            grassPaint = true;
                        }

                        if ( SuperTank.canvas.mapInfo[i] != 0 && SuperTank.canvas.mapInfo[i] != 3){
			        		collFlag = true;
			        		break;
			        	}
			        }
	        	}

            break;

	        case 2:		//right
	        	collX = collX + frameWidth + speed;
		        if (collX >= SuperTank.canvas.mapWidth)
			        collFlag = true;
			    else {
		        	collFlag = false;
		        	for ( i = (collY/tileW * (SuperTank.canvas.mapWidth/tileW) + collX/tileW); i <= ((collY + frameHeight)/tileW * (SuperTank.canvas.mapWidth/tileW) + collX/tileW); i += (SuperTank.canvas.mapWidth/tileW) ){
                        if (SuperTank.canvas.mapInfo[i] == 3) {
                            grassPaint = true;
                        }

                        if ( SuperTank.canvas.mapInfo[i] != 0 && SuperTank.canvas.mapInfo[i] != 3){
			        		collFlag = true;
			        		break;
			        	}
			        }
	        	}

            break;

	        case 3:		//up
	        	collY = collY - speed;
		        if (collY <= 0)
		        	collFlag = true;
		        else {
		        	collFlag = false;
		        	for ( i = (collY/tileW * (SuperTank.canvas.mapWidth/tileW) + collX/tileW); i <= (collY/tileW * (SuperTank.canvas.mapWidth/tileW) + (collX + frameWidth)/tileW); i ++ ){
                        if (SuperTank.canvas.mapInfo[i] == 3) {
                            grassPaint = true;
                        }

                        if ( SuperTank.canvas.mapInfo[i] != 0 && SuperTank.canvas.mapInfo[i] != 3){
			        		collFlag = true;
			        		break;
			        	}
			        }
	        	}

            break;

	        case 4:		//down
	        	collY = collY + frameHeight + speed;
		        if (collY >= SuperTank.canvas.mapHeight)
			        collFlag = true;
			    else {
		        	collFlag = false;
		        	for ( i = (collY/tileW * (SuperTank.canvas.mapWidth/tileW) + collX/tileW); i <= (collY/tileW * (SuperTank.canvas.mapWidth/tileW) + (collX + frameWidth)/tileW); i ++ ){
                        if (SuperTank.canvas.mapInfo[i] == 3) {
                            grassPaint = true;
                        }

                        if ( SuperTank.canvas.mapInfo[i] != 0 && SuperTank.canvas.mapInfo[i] != 3){
			        		collFlag = true;
			        		break;
			        	}
			        }
	        	}
	        	break;

	        default:
	            break;
		}
    	return collFlag;
    }

    boolean isobjCollide( int objX, int objY ) {
    	boolean collFlag = false;
    	int collX, collY;
    	int i;

		collX = posX;
		collY = posY;

		switch(direction & 0x0f) {
	        case 1:		//left
	        	collX = collX - speed;
        	    break;

	        case 2:		//right
	        	collX = collX + speed;
    	        break;

	        case 3:		//up
	        	collY = collY - speed;
	            break;

	        case 4:		//down
	        	collY = collY + speed;
	        default:
	            break;
		}

		if ( collX < (objX + frameWidth) && (collX + frameWidth) > objX &&
				collY < (objY + frameHeight) && (collY + frameHeight) > objY )
			collFlag = true;

    	return collFlag;
    }

	int tankAI() {
        int direction_bak;

        direction_bak = direction;

        if (kind == 3) {
            if ( (direction & 0x0f) == 4 | (direction & 0x0f) == 3) {
                if ( (direction_bak & 0x0f) == 3) {
                    //check up
                    direction = 4;
                    if (!ismapCollide())
                        return direction | 0x10;
                }

                if ( (myrandom.nextInt() & 1) == 0) {
                    //check left
                    direction = 1;
                    if (!ismapCollide())
                        return direction | 0x10;

                    //check right
                    direction = 2;
                    if (!ismapCollide())
                        return direction | 0x10;
                }
                else {
                    //check right
                    direction = 2;
                    if (!ismapCollide())
                        return direction | 0x10;

                    //check left
                    direction = 1;
                    if (!ismapCollide())
                        return direction | 0x10;
                }

                if ( (direction_bak & 0x0f) == 3) {
                    //check up
                    direction = 4;
                    if (!ismapCollide())
                        return direction | 0x10;
                }
                else {
                    //check down
                    direction = 3;
                    if (!ismapCollide())
                        return direction | 0x10;
                }

            }

            if ( (direction & 0x0f) == 2 | (direction & 0x0f) == 1) {
                if ( (myrandom.nextInt() & 1) == 0) {
                    //check up
                    direction = 4;
                    if (!ismapCollide())
                        return direction | 0x10;

                    //check down
                    direction = 3;
                    if (!ismapCollide())
                        return direction | 0x10;
                }
                else {
                    //check down
                    direction = 3;
                    if (!ismapCollide())
                        return direction | 0x10;

                    //check up
                    direction = 4;
                    if (!ismapCollide())
                        return direction | 0x10;
                }

                if ( (direction_bak & 0x0f) == 1) {
                    //check left
                    direction = 2;
                    if (!ismapCollide())
                        return direction | 0x10;
                }
                else {
                    //check right
                    direction = 1;
                    if (!ismapCollide())
                        return direction | 0x10;
                }
            }

        }
        else {
            if ( (direction & 0x0f) == 4 | (direction & 0x0f) == 3) {
                if ( (myrandom.nextInt() & 1) == 0) {
                    //check left
                    direction = 1;
                    if (!ismapCollide())
                        return direction | 0x10;

                    //check right
                    direction = 2;
                    if (!ismapCollide())
                        return direction | 0x10;
                }
                else {
                    //check right
                    direction = 2;
                    if (!ismapCollide())
                        return direction | 0x10;

                    //check left
                    direction = 1;
                    if (!ismapCollide())
                        return direction | 0x10;
                }

                if ( (direction_bak & 0x0f) == 3) {
                    //check up
                    direction = 4;
                    if (!ismapCollide())
                        return direction | 0x10;
                }
                else {
                    //check down
                    direction = 3;
                    if (!ismapCollide())
                        return direction | 0x10;
                }

            }

            if ( (direction & 0x0f) == 2 | (direction & 0x0f) == 1) {
                if ( (myrandom.nextInt() & 1) == 0) {
                    //check up
                    direction = 4;
                    if (!ismapCollide())
                        return direction | 0x10;

                    //check down
                    direction = 3;
                    if (!ismapCollide())
                        return direction | 0x10;
                }
                else {
                    //check down
                    direction = 3;
                    if (!ismapCollide())
                        return direction | 0x10;

                    //check up
                    direction = 4;
                    if (!ismapCollide())
                        return direction | 0x10;
                }

                if ( (direction_bak & 0x0f) == 1) {
                    //check left
                    direction = 2;
                    if (!ismapCollide())
                        return direction | 0x10;
                }
                else {
                    //check right
                    direction = 1;
                    if (!ismapCollide())
                        return direction | 0x10;
                }
            }
        }
            return direction_bak;
        }



}