| 业务背景 物流同城配送，在用户下单的时候会进行配送超区校验，前端会将用户的定位传入后台服务，后台服务针对商家的自定义配送区域（通过地图控件拖拽出来的不规则图形）进行校验。 
实现方案 利用java se工具类来做 java.awt.Polygon api地址： https://docs.oracle.com/javas... 使用到的api主要有： public Polygon(int[] xpoints,int[] ypoints,int npoints)
Parameters:
xpoints - an array of X coordinates 所有点的x坐标
ypoints - an array of Y coordinates 所有点的y坐标
npoints - the total number of points in the Polygon 总共的点数
scene:
把商家通过地图拖拽的多边形各点传入进来，实例化Polygon对象 public boolean contains(double x,double y)
Parameters:
x - the specified X coordinate to be tested x坐标
y - the specified Y coordinate to be tested y坐标
scene:
获取用户当前定位的经纬度，作为x,y坐标系传入进行判断 使用示例 判断规则矩形包含点 
- /**
- * 用例描述：测试场景 多边形为矩形 判断点是否在范围内
- *
- *
- * @since 2016-12-06 by 青芒
- */
- @Test
- public void test_rec_ContainsPoint(){
- try {
- int[] xpoints = {1,1,5,5};
- int[] ypoints = {1,5,5,1};
- Polygon polygon = new Polygon(xpoints, ypoints,4);
-
- boolean contains;
-
- Point p = new Point(2,2);
- contains = polygon.contains(p);
- Assert.assertTrue(contains);
-
- contains = polygon.contains(2, 2);
- Assert.assertTrue(contains);
-
- contains = polygon.contains(1, 4);
- Assert.assertTrue(contains);
-
- contains = polygon.contains(2, 2);
- Assert.assertTrue(contains);
-
- contains = polygon.contains(2.5, 2.5);
- Assert.assertTrue(contains);
- } catch (Exception e) {
- Assert.fail();
- }
- }
- /**
- * 用例描述：测试场景 多边形为矩形 判断矩形是否在范围内
- *
- *
- * @since 2016-12-06 by 青芒
- */
- @Test
- public void test_rec_ContainsRectangle(){
- try {
- int[] xpoints = {1,1,5,5};
- int[] ypoints = {1,5,5,1};
- Polygon polygon = new Polygon(xpoints, ypoints,4);
-
- Rectangle2D rectangle = new Rectangle(2,2,1,1);
- boolean contains = polygon.contains(rectangle);
- Assert.assertTrue(contains);
- } catch (Exception e) {
- Assert.fail();
- }
- }
- /**
- * 用例描述：测试场景 不规则多边形 包含点
- *
- *
- * @since 2016-12-06 by 青芒
- */
- @Test
- public void test_polygon_ContainsPoint(){
- try {
- int[] xpoints = {1,2,4,1,2};
- int[] ypoints = {3,4,3,3,2};
- Polygon polygon = new Polygon(xpoints, ypoints,5);
- boolean contains = polygon.contains(3, 3 );
- Assert.assertTrue(contains);
-
- contains = polygon.contains(2, 1);
- Assert.assertFalse(contains);
- } catch (Exception e) {
- Assert.fail();
- }
- }
- /**
- * 用例描述：测试场景 交叉多边形 包含点
- *
- *
- * @since 2016-12-06 by 青芒
- */
- @Test
- public void test_crossing_ContainsPoint(){
- try {
- int[] xpoints = {1,2,1,3,3};
- int[] ypoints = {1,2,3,3,1};
- Polygon polygon = new Polygon(xpoints, ypoints,5);
- boolean contains = polygon.contains(2, 2 );
- Assert.assertTrue(contains);
-
- contains = polygon.contains(2, 1 );
- Assert.assertTrue(contains);
-
- contains = polygon.contains(2, 1.5);
- Assert.assertTrue(contains);
-
- contains = polygon.contains(2.5, 2.5 );
- Assert.assertTrue(contains);
-
- //多边形外围
- contains = polygon.contains(0, 1);
- Assert.assertFalse(contains);
-
- contains = polygon.contains(1, 2);
- Assert.assertFalse(contains);
-
- contains = polygon.contains(3, 2);
- Assert.assertFalse(contains);
- } catch (Exception e) {
- Assert.fail();
- }
- }
至此对于该超区校验场景的实践已经介绍完毕，使用起来也不难，主要是让大家知道通过javase 的awt类也是可以容易实现的。 |
