📄 tool.java
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import javax.microedition.lcdui.Graphics;
public class Tool {
public static Tool getInstance(){
if(tool == null){
tool = new Tool();
}
return tool;
}
public static void fillScreen(Graphics g, int color) {
g.setClip(0, 0, GameConstant.iSCREEN_WIDTH,
GameConstant.iSCREEN_HEIGHT);
g.setColor(color);
g.fillRect(0, 0, GameConstant.iSCREEN_WIDTH,
GameConstant.iSCREEN_HEIGHT);
}
public static int sin(int angle){
for (; angle < 0; angle += 360);
return iSinTab[angle % 360];
}
public static int cos(int angle){
return sin(angle + 90);
}
// 所有正弦函数值域表
private static int iSinTab[] = {
0, 4, 8, 13, 17, 22, 26, 31, 35, 40,
44, 48, 53, 57, 61, 66, 70, 74, 79, 83,
87, 91, 95, 100, 104, 108, 112, 116, 120, 124,
128, 131, 135, 139, 143, 146, 150, 154, 157, 161,
164, 167, 171, 174, 177, 181, 184, 187, 190, 193,
196, 198, 201, 204, 207, 209, 212, 214, 217, 219,
221, 223, 226, 228, 230, 232, 233, 235, 237, 238,
240, 242, 243, 244, 246, 247, 248, 249, 250, 251,
252, 252, 253, 254, 254, 255, 255, 255, 255, 255,
256, 255, 255, 255, 255, 255, 254, 254, 253, 252,
252, 251, 250, 249, 248, 247, 246, 244, 243, 242,
240, 238, 237, 235, 233, 232, 230, 228, 226, 223,
221, 219, 217, 214, 212, 209, 207, 204, 201, 198,
196, 193, 190, 187, 184, 181, 177, 174, 171, 167,
164, 161, 157, 154, 150, 146, 143, 139, 135, 131,
128, 124, 120, 116, 112, 108, 104, 100, 95, 91,
87, 83, 79, 74, 70, 66, 61, 57, 53, 48,
44, 40, 35, 31, 26, 22, 17, 13, 8, 4,
-1, -5, -9, -14, -18, -23, -27, -32, -36, -41,
-45, -49, -54, -58, -62, -67, -71, -75, -80, -84,
-88, -92, -96, -101, -105, -109, -113, -117, -121, -125,
-128, -132, -136, -140, -144, -147, -151, -155, -158, -162,
-165, -168, -172, -175, -178, -182, -185, -188, -191, -194,
-197, -199, -202, -205, -208, -210, -213, -215, -218, -220,
-222, -224, -227, -229, -231, -233, -234, -236, -238, -239,
-241, -243, -244, -245, -247, -248, -249, -250, -251, -252,
-253, -253, -254, -255, -255, -256, -256, -256, -256, -256,
-256, -256, -256, -256, -256, -256, -255, -255, -254, -253,
-253, -252, -251, -250, -249, -248, -247, -245, -244, -243,
-241, -239, -238, -236, -234, -233, -231, -229, -227, -224,
-222, -220, -218, -215, -213, -210, -208, -205, -202, -199,
-197, -194, -191, -188, -185, -182, -178, -175, -172, -168,
-165, -162, -158, -155, -151, -147, -144, -140, -136, -132,
-129, -125, -121, -117, -113, -109, -105, -101, -96, -92,
-88, -84, -80, -75, -71, -67, -62, -58, -54, -49,
-45, -41, -36, -32, -27, -23, -18, -14, -9, -5
};
public static int getCenterX(int xPos,int angle,int radius){
return xPos - radius*cos(angle);
}
public static int getCenterY(int yPos,int angle,int radius){
return yPos + radius*sin(angle);
}
public static int getXSpeedByAngel(int angel,int speed){
return cos(angel) * speed;
}
public static int getYSPeedByAngel(int angel,int speed){
return sin(angel) * speed;
}
public static int sqrt(int srcNumber) {
if (srcNumber > 0) {
int j;
if (srcNumber > 100)
j = srcNumber;
else
j = 100;
int k;
do {
k = j;
j = srcNumber / j + j >> 1;
} while (j < k);
return k;
} else {
return 0;
}
}
/*
* 获得从一个每隔多少角度的X方向的速度
* @ angleStart 起始角
* @ angleNum 产生多少个角度
* @ angle 角度
* @ speed 运动的速度
*/
public static int[] getXSpeedByAngle(int angleStart, int angleNum,
int angle, int speed) {
xSpeed = new int[angleNum];
for (int idx = 0; idx < angleNum; idx++) {
xSpeed[idx] = getXSpeedByAngel(angleStart - angle * idx, speed);
}
return xSpeed;
}
public static int[] getYSpeedByAngle(int angleStart, int angleNum,
int angle, int speed) {
ySpeed = new int[angleNum];
for (int idx = 0; idx < angleNum; idx++) {
ySpeed[idx] = getYSPeedByAngel(angleStart - angle * idx, speed);
}
return ySpeed;
}
public static int abs(int srcNum)
{
return srcNum >= 0 ? srcNum : ~srcNum + 1;
}
//获得２点的距离
public static int getDistance(int x,int y,int x1,int y1){
return (x1 - x) * (x1 - x) + (y1 - y) * (y1 - y);
}
/**
* 检测2个矩形是否向碰撞
* @param ax 矩形a的左上顶点的X坐标
* @param ay 矩形a的左上顶点的Y坐标
* @param aw 矩形a的宽度
* @param ah 矩形a的高度
* @param bx 矩形b的左上顶点的X坐标
* @param by 矩形b的左上顶点的Y坐标
* @param bw 矩形b的宽度
* @param bh 矩形b的高度
* @return
*/
public static 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 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;
}
// public static Vector getSubsection(String strSource,Font font,int width,String strSplit)
// {
// vector = new Vector();
// String temp=strSource;
// int i,j;
// int LastLength = 1;
// int step = 0;
// try{
// while (!temp.equals("")) {
// i=temp.indexOf("\n");
// if(i>0){
// if(font.stringWidth(temp.substring(0,i-1)) >= width){
// i = -1;
// }
// }
// if(i==-1){
// if(LastLength>temp.length()){
// i = temp.length();
// }else{
// i = LastLength;
// step = font.stringWidth(temp.substring(0, i)) > width ? -1 : 1;
// if(i<temp.length()){
// while (! (font.stringWidth(temp.substring(0, i)) <= width
// && font.stringWidth(temp.substring(0, i + 1)) > width)) {
// i = i + step;
// if (i == temp.length())
// break;
// }
// }
// }
// if(!strSplit.equals("")){
// j = i;
// if (i < temp.length()) {
// while (strSplit.indexOf(temp.substring(i-1,i))==-1) {
// i--;
// if (i == 0) {
// i = j;
// break;
// }
// }
// }
// }
// }
// LastLength = i;
// vector.addElement(temp.substring(0, i));
// if (i == temp.length()) {
// temp = "";
// }
// else{
// temp = temp.substring(i);
// if (temp.substring(0, 1).equals("\n")) {
// temp = temp.substring(1);
// }
// }
// }
// }catch(Exception e)
// {
// //System.out.println("getSubsection:"+e);
// }
//
// temp = null;
// return vector;
// }
//
// public static void releaseVector(){
// vector.removeAllElements();
// vector = null;
// }
//@i 底是10的几次方
public static int square(int i) {
int sum = 1;
for (int idx = 0; idx < i; idx++) {
sum = sum * 10;
}
return sum;
}
private static int [] xSpeed;
private static int [] ySpeed;
//private CImage [] numImage = null;
private static Tool tool;
//private static Vector vector;
}
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