【fix】修复某些投影的无法正确计算MeterPerMapUnit失败的问题

Author: songyumeng

src/common/util/MapCalculateUtil.js

@@ -22,23 +22,21 @@ import { Unit } from '../REST';
  * ```
  */
 export var getMeterPerMapUnit = function(mapUnit) {
-    var earchRadiusInMeters = 6378137;
-    var meterPerMapUnit;
-    if (mapUnit === Unit.METER) {
-        meterPerMapUnit = 1;
-    } else if (mapUnit === Unit.DEGREE) {
-        // 每度表示多少米。
-        meterPerMapUnit = (Math.PI * 2 * earchRadiusInMeters) / 360;
-    } else if (mapUnit === Unit.KILOMETER) {
-        meterPerMapUnit = 1.0e-3;
-    } else if (mapUnit === Unit.INCH) {
-        meterPerMapUnit = 1 / 2.5399999918e-2;
-    } else if (mapUnit === Unit.FOOT) {
-        meterPerMapUnit = 0.3048;
-    } else {
-        return meterPerMapUnit;
-    }
-    return meterPerMapUnit;
+  var earchRadiusInMeters = 6378137;
+  var meterPerMapUnit;
+  if (['m','meter','meters'].indexOf(mapUnit.toLocaleLowerCase())>-1) {
+      meterPerMapUnit = 1;
+  } else if (['degrees','deg','degree','dd'].indexOf(mapUnit.toLocaleLowerCase())>-1) {
+      // 每度表示多少米。
+      meterPerMapUnit = (Math.PI * 2 * earchRadiusInMeters) / 360;
+  } else if (mapUnit === Unit.KILOMETER) {
+      meterPerMapUnit = 1.0e-3;
+  } else if (mapUnit === Unit.INCH) {
+      meterPerMapUnit = 1 / 2.5399999918e-2;
+  } else if (mapUnit === Unit.FOOT) {
+      meterPerMapUnit = 0.3048;
+  }
+  return meterPerMapUnit;
 };
 
 /**

test/common/util/MapCalculateUtilSpec.js

@@ -0,0 +1,24 @@
+import { getMeterPerMapUnit } from '../../../src/common/util/MapCalculateUtil';
+
+describe('MapCalculateUtil', () => {
+  it('getMeterPerMapUnit m', () => {
+      expect(getMeterPerMapUnit('m')).toBe(1);
+      expect(getMeterPerMapUnit('M')).toBe(1);
+      expect(getMeterPerMapUnit('meter')).toBe(1);
+      expect(getMeterPerMapUnit('meters')).toBe(1);
+      expect(getMeterPerMapUnit('METER')).toBe(1);
+      expect(getMeterPerMapUnit('METERS')).toBe(1);
+      expect(getMeterPerMapUnit('METRE')).toBeUndefined()
+  });
+  it('getMeterPerMapUnit dge', () => {
+    expect(getMeterPerMapUnit('degrees')).toBeCloseTo(111319.49079327358, 0.00001);;
+    expect(getMeterPerMapUnit('deg')).toBeCloseTo(111319.49079327358, 0.00001);;
+    expect(getMeterPerMapUnit('degree')).toBeCloseTo(111319.49079327358, 0.00001);;
+    expect(getMeterPerMapUnit('dd')).toBeCloseTo(111319.49079327358, 0.00001);;
+    expect(getMeterPerMapUnit('DEGREES')).toBeCloseTo(111319.49079327358, 0.00001);;
+    expect(getMeterPerMapUnit('DEG')).toBeCloseTo(111319.49079327358, 0.00001);;
+    expect(getMeterPerMapUnit('DEGREE')).toBeCloseTo(111319.49079327358, 0.00001);;
+    expect(getMeterPerMapUnit('DD')).toBeCloseTo(111319.49079327358, 0.00001);;
+    expect(getMeterPerMapUnit('degre')).toBeUndefined()
+});
+});

test/test-main-common.js

@@ -216,3 +216,4 @@ import './common/components/chart/ChartViewSpec';
 
 import './common/util/FetchRequestSpec';
 import './common/lang/LangSpec.js';
+import './common/util/MapCalculateUtilSpec';