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 stubString 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90list.add(90);state=rotate(state,90);sb.append("转90,");break;case 1://转180list.add(180);sb.append("转180,");state=rotate(state,180);break;case 2://转270list.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;elsedegree=-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;}}