tools.java

一个rpg的游戏。。源码 要学习的朋友可以来下载

package org.gamecollege.j2me.rpg;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Vector;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.game.Sprite;

/**
 * @author Jagie 工具方法集合类
 */
public class Tools {
	/**
	 * 单例
	 */
	private static final Tools self = new Tools();

	/**
	 * 私有构造函数。
	 *  
	 */
	private Tools() {

	}

	/**
	 * 以字符的方式读取文件
	 * 
	 * @param fichero
	 *            文件名
	 * @return 整个文件形成的字符串
	 */
	public final static String readFileToString(String fichero) {
		StringBuffer str = new StringBuffer();
		try {
			Class clase = self.getClass();
			InputStream is;
			is = clase.getResourceAsStream(fichero);
			InputStreamReader isr = new InputStreamReader(is);
			char[] chars = new char[1];

			while (isr.read(chars) != -1) {
				str.append(new String(chars));
			}
			is.close();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (NullPointerException ficheroNoExiste) {
			return "";
		}
		return str.toString();

		
		
	}
	
	
	

	/**
	 * 去掉字串中的多行注释
	 * 
	 * @param src
	 * @return
	 */

	public final static String delMutilLineComment(String src) {
		return deleteChars(src, "/*", "*/");
	}
	
	
	/**
	 * 去掉字符串中用beginString和endString包围的部分。包括endString和beginString字串在内
	 * @param src 待处理的源串
	 * @param beginString 
	 * @param endString
	 * @return
	 */

	private final static String deleteChars(String src, String beginString,
			String endString) {
		if (src == null || src.length() == 0) {
			return null;
		}

		StringBuffer sb = new StringBuffer();

		int firstIndex = src.indexOf(beginString, 0);
		if (firstIndex >= 0) {
			sb.append(src.substring(0, firstIndex));
		} else {

			return src;
		}

		int lastIndex = 0;
		while (firstIndex < src.length() && firstIndex >= 0) {
			lastIndex = src.indexOf(endString, firstIndex + 2);
			firstIndex = src.indexOf(beginString, lastIndex + 1);

			if (firstIndex > lastIndex) {
				String good = src.substring(lastIndex + 2, firstIndex);
				sb.append(good);
			}

		}

		if (firstIndex < 0 && lastIndex + 2 < src.length()) {
			sb.append(src.substring(lastIndex + 2));
		}

		return sb.toString();
	}
	
	
	/**
	 * 一个较为快捷的碰撞检测方法
	 * @param ax a矩形左上角x坐标
	 * @param ay a矩形左上角y坐标
	 * @param aw a矩形宽度
	 * @param ah a矩形高度
	 * @param bx b矩形左上角x坐标
	 * @param by b矩形左上角y坐标
	 * @param bw b矩形宽度
	 * @param bh b矩形高度
	 * @return
	 */
	public static final boolean isIntersectingRect(int ax, int ay, int aw,
			int ah, int bx, int by, int bw, int bh) {
		if (by + bh < ay || // is the bottom of b above the top of a?
				by > ay + ah || // is the top of b below bottom of a?
				bx + bw < ax || // is the right of b to the left of a?
				bx > ax + aw) // is the left of b to the right of a?
			return false;

		return true;
	}

	/**
	 * 比较精灵S2相对于精灵S2的方位
	 * 
	 * @param s1
	 * @param s2
	 * @return 
	 * Canvas.DOWN:S1在S2的下方，
	 * Canvas.UP:S1在S2的上方，
	 * Canvas.LEFT:S1在S2的左方，
	 * Canvas.RIGHT:S1在S2的右方
	 */
	public final static int comparePos(Sprite s1, Sprite s2) {
		int result = Canvas.DOWN;
		int ox1 = s1.getX() + s1.getWidth() / 2;
		int oy1 = s1.getY() + s1.getHeight() / 2;

		int ox2 = s2.getX() + s2.getWidth() / 2;
		int oy2 = s2.getY() + s2.getHeight() / 2;

		if (oy1 < oy2 && Math.abs(oy1 - oy2) > Math.abs(ox1 - ox2)) {
			return Canvas.UP;
		} else if (ox1 > ox2 && Math.abs(oy1 - oy2) < Math.abs(ox1 - ox2)) {
			return Canvas.RIGHT;
		} else if (ox1 < ox2 && Math.abs(oy1 - oy2) < Math.abs(ox1 - ox2)) {
			return Canvas.LEFT;
		}

		return result;
	}
	
	/**
	 * 把Vector v2的所有元素都加到Vector v1中,相当于SE中Vector的addAll
	 * @param v1
	 * @param v2
	 * @return
	 */
	public final static Vector addAll(Vector v1, Vector v2) {
		if (v1 != null && v2 != null) {
			for (int i = 0; i < v2.size(); i++) {
				v1.addElement(v2.elementAt(i));
			}
		}

		return v1;
	}

}