Hello
I am trying to create a buffer tool widget and I saw couple of examples. The first example shows creating buffer on point and second is to create buffer on line and polygons. Here are the links.
Buffer a point | ArcGIS API for JavaScript
Geometry Service - Buffer | ArcGIS API for JavaScript
The buffer on point works fine with me, but I have an issue creating the buffer on line and polygon. Below is my code:
var gsvc = new esri.tasks.GeometryService("http://tasks.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");
startup: function() {
this.inherited(arguments);
this.toolbar = new Draw(this.map);
this.toolbar.on("draw-end", this._doBuffer);
},
_doBuffer: function(evtObj) {
var geometry = evtObj.geometry;
switch (geometry.type) {
case "point":
var symbol = new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_SQUARE, 10, new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID, new Color([255,0,0]), 1), new Color([0,255,0,0.25]));
break;
case "polyline":
var symbol = new SimpleLineSymbol();
break;
case "polygon":
var symbol = new SimpleFillSymbol(SimpleFillSymbol.STYLE_NONE, new SimpleLineSymbol(SimpleLineSymbol.STYLE_DASHDOT, new Color([255,0,0]), 2), new Color([255,255,0,0.25]));
break;
}
var graphic = new Graphic(geometry, symbol);
this.map.graphics.add(graphic);
//setup the buffer parameters
var params = new BufferParameters();
params.distances = [ 5 ];
params.bufferSpatialReference = this.map.spatialReference;
params.outSpatialReference = this.map.spatialReference;
//**************BELOW I TRIED DIFFERENT WAYS****************************
//params.unit = GeometryService["UNIT_KILOMETER"];
//params.unit = esri.tasks.GeometryService.UNIT_KILOMETER;
params.unit = GeometryService["UNIT_KILOMETER"];
//params.unit =eval("esri.tasks.GeometryService.UNIT_FOOT");
if (geometry.type === "polygon") {
//if geometry is a polygon then simplify polygon. This will make the user drawn polygon topologically correct.
gsvc.simplify([geometry], function(geometries) {
params.geometries = geometries;
gsvc.buffer(params, this._test);
});
} else {
console.log("The geometry is "+geometry.type);
params.geometries = [geometry];
lang.hitch(this, gsvc.buffer(params, this._test));
//*********************THIS IS WHERE MY CODE BREAKS***************************
//******************IF I USE EITHER OF BELOW CODE, IT DOES NOT DO ANYTHING***********************
gsvc.buffer(params, lang.hitch(this, _test));
gsvc.buffer(params, lang.hitch(this, this._showBuffer));
}
},
_showBuffer: function(bufferedGeometries) {
//************IT NEVER REACHES HERE TO SHOW BELOW MESSAGE IN CONSOLE **************************
console.log("test");
var symbol = new SimpleFillSymbol(
SimpleFillSymbol.STYLE_SOLID,
new SimpleLineSymbol(
SimpleLineSymbol.STYLE_SOLID,
new Color([255,0,0,0.65]), 2
),
new Color([255,0,0,0.35])
);
array.forEach(bufferedGeometries, function(geometry) {
var graphic = new Graphic(geometry, symbol);
this.map.graphics.add(graphic);
});
this.toolbar.deactivate();
//app.map.showZoomSlider();
},
I would really appreciate if someone can help me.
Thanks
Qazi
