paddle.java

J2ME做的打砖块游戏,是学校的课程项目

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.util.Random;
import java.lang.System;

public class Paddle extends MoveObject
{
	private boolean left;

	private boolean right;

	public float restLimit = 0.1f;

	public float stickykey = 1.0f;

	public float attenuation = -0.7f;

	public float resistance = 0.03f;

	public float acceleration = 0.05f, antiAcceleration = 0.03f;

	public Paddle(String path, int x, int y, float vx, float vy, int type)
	{
		super(path, x, y, vx, vy, type);
	}

	public Paddle(String path, int width, int height, int x, int y, float vx, float vy, int type)
	{
		super(path, width, height, x, y, vx, vy, type);
	}


	public void enlarge(String path, int width, int height)
	{
		
		try
		{
			moveObject = scale(Image.createImage(path), width, height);
		}
		catch (Exception e)
		{
		}
		
		this.cx = moveObject.getWidth();
		this.cy = moveObject.getHeight();
	}


	public static Image scale(Image src, int width, int height)
	{
		long start = System.currentTimeMillis();
		int scanline = src.getWidth();
		int srcw = src.getWidth();
		int srch = src.getHeight();
		int buf[] = new int[srcw*srch];
		src.getRGB(buf, 0, scanline, 0, 0, srcw, srch);
		int buf2[] = new int[width*height];
		for (int y = 0; y < height; y++)
		{
			int c1 = y * width;
			int c2 = (y * srch / height) * scanline;
			for (int x = 0; x < width; x++)
			{
				buf2[c1 + x] = buf[c2 + x * srcw / width];
			}
		}
		Image img = Image.createRGBImage(buf2, width, height, true);
		long end = System.currentTimeMillis();
		return img;
	}

	public void move(boolean left, boolean right)
	{

		this.left = left;
		this.right = right;
	}

	public void generateMove()
	{

		if ((vx - (int)vx) > 0.5f)
			x += ((int)vx + 1);
		else
			x += (int)vx;
	}

	public void getV()
	{
		if (left)
		{
			if (vx < restLimit && vx > -restLimit)
			{
				vx = -1.0f;
			}
			else if (vx < 0.0f)
			{
				vx -= antiAcceleration;
			}
			else if (vx > 0.0f)
			{
				vx -= acceleration;
			}
		}

		if (right)
		{
			if (vx < restLimit && vx > -restLimit)
			{
				vx = 1.0f;
			}
			else if (vx > 0.0f)
			{
				vx += antiAcceleration;
			}
			else if (vx < 0.0f)
			{
				vx += acceleration;
			}
		}

		if (!left && !right)
		{
			if ((vx < stickykey && vx > 0.0f) || (vx > -stickykey && vx < 0.0f))
				vx = 0.0f;
			else if (vx > 0.0f)
			{
				vx -= resistance;
			}
			else if (vx < 0.0f)
			{
				vx += resistance;
			}
		}
	}


}