Latest Contributions by JoshuaMcCurry

I am trying to convert a graphics array to a FeatureLayer, exactly like the following ESRI API example: ArcGIS API for JavaScript Sandbox  I'm having to convert this example back to 3.2 because I need to add a feature table which is not yet available in 4.3. Can anybody tell me how to do this with the 3.2 library instead of the 4.3? More specifically, I need to know how to get the same results on the 'new Point' function found on line 293. In 4.3, the array that is created has a lot more attributes that the same array created in 3.2. From what I can tell, this is what is keeping me from creating the new FeatureLayer in 3.2.  Thank you. ... View more

I am trying to get points to plot along an ellipse around a point. I can get the ellipse to draw but the scale is off (very large). The scale is closer when i divide my variable by "200000".  I believe it has something to do with using lat long (Degrees) instead of x y (Feet). Can anybody check my code/math to see where I'm going wrong? Any advise is appreciated. ____________________              function drawPt (lat, lon, size, color, drawBorder){                 var markerSymbol = new SimpleMarkerSymbol({ "color": color, "size": size, "type": "esriSMS", "style": "esriSMSCircle", "outline": { "color": [255, 255, 255], "width": 1, "type": "esriSLS", "style": "esriSLSSolid" }});                 if (!drawBorder)                 markerSymbol = new SimpleMarkerSymbol({ "color": color, "size": size, "type": "esriSMS", "style": "esriSMSCircle"});                 var point = new Point({ "x": lon, "y": lat, "spatialReference": {"wkid": 4326 }}),                 markerSymbol = markerSymbol;                 var pointGraphic = new Graphic(point, markerSymbol);                 graphicsLayer.add(pointGraphic);}             function toRadians(degrees){             return degrees * (Math.PI / 180);}             function drawEl(lat, lon, major, minor, angle)             {                 var h = lon; // x coord of ellipse centre (in degrees)                 var k = lat; // y coord of ellipse centre (in degrees)                 //The scale is close when i divide these variables by 200000...(= minor/200000)(= major/200000)                 var a = minor; //originally in meters                 var b = major; //originally in meters                 var ang = (0-(toRadians(angle))); // rotation, counter-clockwise, from north (I added "0-" to get the additive inverse because 'angle' is a bearing that runs clockwise.)                 var points = [];                 for (var i = 0; i < 360; i++) // one point per degree, change if you wish                  {                     var t = toRadians(i); // ellipse math                     var x = a * (Math.cos(t)); // ellipse math                     var y = b * (Math.sin(t)); // ellipse math                     var rot_x = h + (x*Math.cos(ang)) - (y * Math.sin(ang)); // rotate/transpose ellipse                     var rot_y = k + (y*Math.cos(ang)) + (x * Math.sin(ang)); // rotate/transpose ellipse                     points.push(new Point(rot_x, rot_y)); // save points to list                     drawPt(rot_y, rot_x, 2, [100, 100, 0], false);                  }             } ... View more

I’ve got an array of points that include location information, as well as information that defines a geographical ellipse.  Although I can plot the points via lat/lon, I’m not sure how to draw an ellipse with the data. The data includes the following information, per point (which is the center of the ellipse): Latitude Longitude Ellipse Bearing (bearing of the major axis of the ellipse from true north) Major (width in meters of the ellipse along the major axis) Minor (width in meters of the ellipse along the perpendicular axis) Sample data set: [{“lat”: 33.678265, “lon”: -86.337571, “bearing”: 76, “major”: 465, “minor”: 411}, {“lat”: 33.6779101, “lon”: -86.3448787, “bearing”: 130, “major”: 599, “minor”: 481}] It would appear from what I’ve looked at online that there are two possible solutions…either calculate a polygon that emulates the ellipse, or to draw it with a library like DOJO.   I’m not skilled at custom programming, and I’m wondering if someone could help me come up with a function that accomplishes either giving a polygon that I can add to the map to emulate the ellipse, or a function that utilizes DOJO to accurately draw the ellipse to scale on the map. Thank you for any suggestions. ... View more