摘要：業(yè)務(wù)背景物流同城配送，在用戶下單的時候會進(jìn)行配送超區(qū)校驗，前端會將用戶的定位傳入后臺服務(wù)，后臺服務(wù)針對商家的自定義配送區(qū)域通過地圖控件拖拽出來的不規(guī)則圖形進(jìn)行校驗。

物流同城配送，在用戶下單的時候會進(jìn)行配送超區(qū)校驗，前端會將用戶的定位傳入后臺服務(wù)，后臺服務(wù)針對商家的自定義配送區(qū)域（通過地圖控件拖拽出來的不規(guī)則圖形）進(jìn)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(biāo)
ypoints - an array of Y coordinates  所有點的y坐標(biāo)
npoints - the total number of points in the Polygon 總共的點數(shù)
scene:
把商家通過地圖拖拽的多邊形各點傳入進(jìn)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(biāo)  
y - the specified Y coordinate to be tested y坐標(biāo)
scene:
獲取用戶當(dāng)前定位的經(jīng)緯度，作為x,y坐標(biāo)系傳入進(jìn)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(nèi)
     *
     *
     * @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(nèi)
     *
     *
     * @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(guī)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(qū)校驗場景的實踐已經(jīng)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(xiàn)的。