图片旋转翻转和初始坐标系的关系

package laladin.angleTest;
 
import java.util.ArrayList;
import java.util.List;
 
 
 
public class AngleTest {
 
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String state="1234";
int key;
List<Integer> list=new ArrayList<Integer>();
StringBuffer sb=new StringBuffer();
for(int i=0;i<100;i++){
key=(int)(Math.random()*5);
switch (key) {
case 0:
//转90
list.add(90);
state=rotate(state,90);
sb.append("转90,");
break;
case 1:
//转180
list.add(180);
sb.append("转180,");
state=rotate(state,180);
break;
case 2:
//转270
list.add(270);
sb.append("转270,");
state=rotate(state,270);
break;
case 3:
//水平
list.add(-1);
sb.append("水平,");
state=hFlip(state);
break;
case 4:
//垂直
list.add(-2);
sb.append("垂直,");
state=vFlip(state);
break;
}
}
System.out.println(sb.toString());
System.out.println(state);
state="1234";
int aa=rotateAndFlip(list);
if(aa<0)
state=hFlip(state);
state=rotate(state,Math.abs(aa));
System.out.println(state);
}
public static String rotate(String string,int degree){
switch (degree) {
case 90:
string=string.substring(3)+string.substring(0, 3);
break;
case 180:
string=string.substring(2)+string.substring(0,2);
break;
case 270:
string=string.substring(1)+string.substring(0,1);
break;
}
return string;
}
public static String hFlip(String string){
string=string.substring(1,2)+string.substring(0,1)+string.substring(3)+string.substring(2,3);
return string;
}
public static String vFlip(String string){
string=string.substring(3)+string.substring(2,3)+string.substring(1,2)+string.substring(0,1);
return string;
}
/**
* 旋转和翻转过后与原图的比较
* @param list 得到的步骤集合,-1表示水平翻转,-2表示垂直翻转,0到360表示旋转度数.
* @return 返回结果,数值表示需要顺时针旋转的度数,符号位表示是否需要水平翻转.<br />
* 如果得到的是一个正数,那么原图只需做相应度数的顺时针旋转<br />
* 如果得到的是一个负数,那么原图需要先做一次水平翻转,再做相应度数的顺时针旋转.<br />
*/
public static int rotateAndFlip(List<Integer> list){
/**是否需要翻转**/
boolean needRotate=false;
/**需要旋转的度数**/
int degree=0;
for (Integer integer : list) {
switch (integer) {
case -1://水平翻转
if(needRotate=!needRotate)
degree=360-degree;
else
degree=-degree;
break;
case -2://垂直翻转
degree=180-degree;
needRotate=!needRotate;
break;
default:
degree=degree+integer;
break;
}
if (degree<0) degree=degree+360;
if (degree>=360) degree=degree-360;
}
if (needRotate)degree=-degree;
if(needRotate && degree==0)return -360;
return degree;
}
}