android 线段与矩形碰撞检测

/**
 * 线段与矩形碰撞检测
* 
 * @param x1 线段一端点x坐标
* @param y1 线段一端点y坐标
* @param x2 线段二端点x坐标
* @param y2 线段二端点y坐标
* @param x 矩形左上角x坐标
* @param y 矩形左上角y坐标
* @param width 矩形宽度
* @param height 矩形高度
* @return
 */

1.

2.public static boolean lineWidthRect(int x1, int y1, int x2, int y2, int x, int y, int width, int height) {

3.double a =(double) ((y1 - y2)) / (double) ((x1 - x2));

4.double b =y1 - a * x1;

5.if (x1 < x2) {

6.for (int i =x1; i <= x2; i++) {

7.int tempY =(int) (a * i + b);

8.if (intersectRect(i, tempY, 1, 1, x, y, width, height)) {

9.return true;

10.}

11.}

12.} else if (x1 > x2) {

13.for (int i =x1; i >= x2; i--) {

14.int tempY =(int) (a * i + b);

15.if (intersectRect(i, tempY, 1, 1, x, y, width, height)) {

16.return true;

17.}

18.}

19.} else {

20.if (y1 <= y2) {

21.for (int i =y1; i < y2; i++) {

22.if (intersectRect(x1, i, 1, 1, x, y, width, height)) {

23.return true;

24.}

25.}

26.} else {

27.for (int i =y2; i > y2; i--) {

28.if (intersectRect(x1, i, 1, 1, x, y, width, height)) {

29.return true;

30.}

31.}

32.}

33.}

34.return false;

35.}