摘要：業務背景物流同城配送，在用戶下單的時候會進行配送超區校驗，前端會將用戶的定位傳入后臺服務，后臺服務針對商家的自定義配送區域通過地圖控件拖拽出來的不規則圖形進行校驗。

物流同城配送，在用戶下單的時候會進行配送超區校驗，前端會將用戶的定位傳入后臺服務，后臺服務針對商家的自定義配送區域（通過地圖控件拖拽出來的不規則圖形）進行校驗。

利用java se工具類來做 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  所有點的x坐標
ypoints - an array of Y coordinates  所有點的y坐標
npoints - the total number of points in the Polygon 總共的點數
scene:
把商家通過地圖拖拽的多邊形各點傳入進來，實例化Polygon對象
public boolean contains(double x,double y)
Parameters:
x - the specified X coordinate to be tested x坐標  
y - the specified Y coordinate to be tested y坐標
scene:
獲取用戶當前定位的經緯度，作為x,y坐標系傳入進行判斷

   /**
     * 用例描述：測試場景 多邊形為矩形 判斷點是否在范圍內
     *
     *
     * @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：測試場景 多邊形為矩形 判斷矩形是否在范圍內
     *
     *
     * @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：測試場景 不規則多邊形 包含點
     *
     *
     * @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：測試場景 交叉多邊形 包含點
     *
     *
     * @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);

            //多邊形外圍
            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();
        }
    }

至此對于該超區校驗場景的實踐已經介紹完畢，使用起來也不難，主要是讓大家知道通過javase 的awt類也是可以容易實現的。