Latest Contributions by MarkBaird

I altered my code anyway as it only took a couple of minutes and demonstrates how we can use the "difference" tool to build on what we were looking at.  It's created as follows: 1. Draw the buffer (red), 2. then define another polygon to intersect the arc segment (green) 3. call the intersect operation which results in your arc (yellow) which I changed to be a polygon in this example 4. define another inner buffer (blue) 5. perform a difference on the yellow arc and the inner buffer 6. final polygon in cyan [ATTACH=CONFIG]32391[/ATTACH]     //centre of arc where we clicked the map     Point centrePt = map.toMapPoint(event.getX(), event.getY());         //buffer to get circle as a polygon     Polygon circle = GeometryEngine.buffer(centrePt, map.getSpatialReference(), 5000000, null);         //create a line of the circle     //Polyline circleLine = new Polyline();     //circleLine.addPath(circle, 0, false);         //draw the circle     SimpleLineSymbol redLine = new SimpleLineSymbol(Color.RED, 2);     Graphic circleGraphic = new Graphic(circle, redLine);     graphicsLayer.addGraphic(circleGraphic);         //create intersection geometry     Polygon intersection = new Polygon();     intersection.startPath(centrePt);     intersection.lineTo(centrePt.getX(), centrePt.getY() + 10000000);     intersection.lineTo(centrePt.getX() + 10000000, centrePt.getY());         //draw intersection geometry     SimpleLineSymbol greenLine = new SimpleLineSymbol(Color.GREEN, 2);     Graphic intersectGraphic = new Graphic(intersection, greenLine);     graphicsLayer.addGraphic(intersectGraphic);         //now we can perform an intersection operation to create the arc     Polygon arc =  (Polygon) GeometryEngine.intersect(circle, intersection, map.getSpatialReference());         //draw the arc     SimpleLineSymbol yellowLine = new SimpleLineSymbol(Color.YELLOW, 5);     Graphic arcGraphic = new Graphic(arc, yellowLine);     graphicsLayer.addGraphic(arcGraphic);         //create another smaller buffer     Polygon innerCircle = GeometryEngine.buffer(centrePt, map.getSpatialReference(), 3000000, null);         //and draw it     SimpleLineSymbol blueSymbol = new SimpleLineSymbol(Color.BLUE, 2);     Graphic innerCircleGraphic = new Graphic(innerCircle, blueSymbol);     graphicsLayer.addGraphic(innerCircleGraphic);         //use the difference tool to clip out the inner circle     Polygon wideArcPoly = (Polygon) GeometryEngine.difference(arc, innerCircle, map.getSpatialReference());         //and draw it with a fill symbol     SimpleFillSymbol fillSymbol = new SimpleFillSymbol(Color.cyan);     Graphic widArcGraphic = new Graphic(wideArcPoly,fillSymbol);     graphicsLayer.addGraphic(widArcGraphic); ... View more