fix #1595 (#1618)

Author: fuzhenn

src/geometry/Geometry.js

@@ -464,6 +464,10 @@ class Geometry extends JSONAble(Eventable(Handlerable(Class))) {
         const symbol = this._sizeSymbol;
         const t = (symbol && symbol['lineWidth'] || 1) / 2;
         this._fixedExtent.set(-t, -t, t, t);
+        const dx = (symbol && symbol['lineDx']) || 0;
+        this._fixedExtent._add([dx, 0]);
+        const dy = (symbol && symbol['lineDy']) || 0;
+        this._fixedExtent._add([0, dy]);
         return this._fixedExtent;
     }
 
@@ -1268,12 +1272,13 @@ class Geometry extends JSONAble(Eventable(Handlerable(Class))) {
     }
 
     _getSizeSymbol(symbol) {
-        let symbolSize;
-        if (isFunctionDefinition(symbol['lineWidth'])) {
-            symbolSize = loadGeoSymbol({ lineWidth: symbol['lineWidth'] }, this);
+        const symbolSize = loadGeoSymbol({
+            lineWidth: symbol['lineWidth'],
+            lineDx: symbol['lineDx'],
+            lineDy: symbol['lineDy']
+        }, this);
+        if (isFunctionDefinition(symbol['lineWidth']) || isFunctionDefinition(symbol['lineDx']) || isFunctionDefinition(symbol['lineDy'])) {
             symbolSize._dynamic = true;
-        } else {
-            symbolSize = { lineWidth: symbol['lineWidth'] };
         }
         return symbolSize;
     }

test/geometry/LineStringSpec.js

@@ -303,6 +303,15 @@ describe('Geometry.LineString', function () {
         expect(layer.identify({x: 118.84733998413094, y: 32.04636121481619}).length).to.be.above(0);
     });
 
+    //issue #1595
+    it('identify line with dx, dy, #1595', function () {
+        var line = new maptalks.LineString([map.getCenter(), map.getCenter().add(0.001, 0)], { symbol: { lineDx: 20, lineDy: 20, lineWidth :4 }});
+        layer.addGeometry(line);
+
+        var point = new maptalks.Point(map.width / 2 + 20, map.height / 2 + 20);
+        expect(layer.identifyAtPoint(point).length).to.be.above(0);
+    });
+
     //issue #522
     it('drawn with arrow of vertex-first', function () {
         map.setPitch(60);