tools.java

基于java的一款游戏的故事。基于java的一款游戏的故事。基于java的一款游戏的故事。

package com.thinkenjoy.tools;

import java.io.InputStream;
import java.util.Random;
import java.util.Vector;

import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;

/**
 * 工具类
 */
public final class Tools {
  public static final int ARROW_LEFT = 0;

  public static final int ARROW_RIGHT = 1;

  public static final int ARROW_UP = 2;

  public static final int ARROW_DOWN = 3;

  private static final Random randomizer = new Random();

  /**
   * 获得相应范围内的随机数
   *
   * @param min
   *            取值范围内的最小值
   * @param max
   *            取值范围内的最大值
   * @return
   */
  public static final int getRand(int min, int max) {
    int r = Math.abs(randomizer.nextInt());
    return (r % ((max - min + 1))) + min;
  }

  /**
   * 经常要用到的设置变量
   */
  public static final int GRAPHICS_TOP_LEFT = Graphics.LEFT | Graphics.TOP;

  /**
   * 按相应的长度扩大一个数组
   *
   * @param 旧的需要扩充的数组
   * @param 需要扩充的长度
   * @return 扩充后的新数组 (复制旧数组并增大相应的长度
   */
  public final static int[] expandArray(int[] oldArray, int expandBy) {
    int[] newArray = new int[oldArray.length + expandBy];
    System.arraycopy(oldArray, 0, newArray, 0, oldArray.length);
    return newArray;
  }


  /**
   * 按相应的长度扩大一个二维图片数组
   * @param 旧的需要扩充的数组
   * @param 需要扩充的长度
   * @return 扩充后的新数组 (复制旧数组并增大相应的长度
   */
  public final static Image[][] expandArray(Image[][] oldArray, int expandBy) {
    Image[][] newArray = new Image[oldArray.length + expandBy][];
    System.arraycopy(oldArray, 0, newArray, 0, oldArray.length);
    return newArray;
  }



  /**
   * 根据图片名读取图片
   * @param fileName
   *            图片名
   * @return 读取的图片
   */
  public static Image getImage(String fileName) {
    try {
      return Image.createImage("/" + fileName + ".png");
    } catch (Exception e) {
      System.out.println("loading image error! " + fileName + ".png");
    }
    return null;
  }

  /**
   * 画艺术字
   *
   * @param g
   * @param mainColor
   * @param topColor
   * @param bottomColor
   * @param str
   * @param x
   * @param y
   * @param anchor
   */
  public static void drawArtString(Graphics g, int mainColor, int topColor,
      int bottomColor, String str, int x, int y, int anchor) {
    if (topColor >= 0) {
      g.setColor(topColor);
      g.drawString(str, x - 1, y, anchor);
      g.drawString(str, x, y - 1, anchor);
      g.drawString(str, x - 1, y - 1, anchor);
    }
    if (bottomColor >= 0) {
      g.setColor(bottomColor);
      g.drawString(str, x + 1, y, anchor);
      g.drawString(str, x, y + 1, anchor);
      g.drawString(str, x + 1, y + 1, anchor);
    }
    g.setColor(mainColor);
    g.drawString(str, x, y, anchor);
  }

  /**
   * 将原始的信息逐行分解并存入相应容器
   *
   * @param sb
   *            Vector容器
   * @param originalInfo
   *            原始的字符串
   * @param textWidth
   *            一行的宽度
   */
  public static void divideString(Vector sb, String originalInfo, int textWidth) {
    int offSet = 0;
    for (int i = 0; i < originalInfo.length(); i++) {
      if (i == originalInfo.length() - 1) {
        if (Font.getDefaultFont().substringWidth(originalInfo, offSet,
                                                 i + 1 - offSet) >= textWidth) {
          sb.addElement(originalInfo.substring(offSet, i));
          sb.addElement(originalInfo.substring(i, i + 1));
        } else {
          sb.addElement(originalInfo.substring(offSet, i + 1));
        }
      } else if (Font.getDefaultFont().substringWidth(originalInfo,
        offSet, i + 1 - offSet) >= textWidth) {
        sb.addElement(originalInfo.substring(offSet, i));
        offSet = i;
      }
    }
  }

  /**
   * 绘制各个方向的箭头
   * @param g
   * @param pos1x
   * @param pos1y
   * @param direct
   *
   */
  public static void drawArrow(Graphics g, int pos1x, int pos1y, int direct) {
    switch (direct) {
    case ARROW_LEFT:
      g.drawLine(pos1x, pos1y, pos1x - 9, pos1y);
      g.drawLine(pos1x - 5, pos1y + 3, pos1x - 9, pos1y);
      g.drawLine(pos1x - 5, pos1y - 3, pos1x - 9, pos1y);
      break;
    case ARROW_RIGHT:
      g.drawLine(pos1x, pos1y, pos1x + 9, pos1y);
      g.drawLine(pos1x + 5, pos1y + 3, pos1x + 9, pos1y);
      g.drawLine(pos1x + 5, pos1y - 3, pos1x + 9, pos1y);
      break;
    case ARROW_UP:
      g.drawLine(pos1x, pos1y, pos1x, pos1y - 9);
      g.drawLine(pos1x + 3, pos1y - 5, pos1x, pos1y - 9);
      g.drawLine(pos1x - 3, pos1y - 5, pos1x, pos1y - 9);
      break;
    case ARROW_DOWN:
      g.drawLine(pos1x, pos1y, pos1x, pos1y + 9);
      g.drawLine(pos1x + 3, pos1y + 5, pos1x, pos1y + 9);
      g.drawLine(pos1x - 3, pos1y + 5, pos1x, pos1y + 9);
      break;
    }
  }
}