Add angleLineInterval option

docs/03-Radar-Chart.md

@@ -76,6 +76,9 @@ These are the customisation options specific to Radar charts. These options are
 	//Number - Pixel width of the angle line
 	angleLineWidth : 1,
 
+	//Number - Interval at which to draw angle lines ("every Nth point")
+	angleLineInterval: 1,
+
 	//String - Point label font declaration
 	pointLabelFontFamily : "'Arial'",
 
@@ -174,4 +177,4 @@ Calling `removeData()` on your Chart instance will remove the first value for al
 ```javascript
 myRadarChart.removeData();
 // Other points will now animate to their correct positions.
-```
+```

src/Chart.Core.js

@@ -2058,7 +2058,7 @@
 					for (var i = this.valuesCount - 1; i >= 0; i--) {
 						var centerOffset = null, outerPosition = null;
 
-						if (this.angleLineWidth > 0){
+						if (this.angleLineWidth > 0 && (i % this.angleLineInterval === 0)){
 							centerOffset = this.calculateCenterOffset(this.max);
 							outerPosition = this.getPointPosition(i, centerOffset);
 							ctx.beginPath();

src/Chart.Radar.js

@@ -28,6 +28,9 @@
 			//Number - Pixel width of the angle line
 			angleLineWidth : 1,
 
+			//Number - Interval at which to draw angle lines ("every Nth point")
+			angleLineInterval: 1,
+
 			//String - Point label font declaration
 			pointLabelFontFamily : "'Arial'",
 
@@ -181,6 +184,7 @@
 				lineColor: this.options.scaleLineColor,
 				angleLineColor : this.options.angleLineColor,
 				angleLineWidth : (this.options.angleShowLineOut) ? this.options.angleLineWidth : 0,
+        angleLineInterval: (this.options.angleLineInterval) ? this.options.angleLineInterval : 1,
 				// Point labels at the edge of each line
 				pointLabelFontColor : this.options.pointLabelFontColor,
 				pointLabelFontSize : this.options.pointLabelFontSize,