[OpenLayers-Users] Re: no intersection when features snap

[Peter]

hey guys,

first thanks for your help. i found a solution with the jsts framework. i
will post my code if someone has got the same problem.

Here it is:

function validateDrawing()
		{	
			//initialize openLayers parser
			var openLayersParser = new jsts.io.OpenLayersParser();	
//array needed to check if the feature is already overlaping one so it is
not called twice
			var alreadyOverlapping = [];
			//each layes		
			for(var i = 1; i < priorityLayerArray.length;i++)
			{
				var intersectableFeatures = priorityLayerArray[i].features;
				//each features
				for (var j = 0; j < intersectableFeatures.length; j++)
				{
					//current feature to comapre
					var currentfeature = intersectableFeatures[j];
					//parse it so the jsts framework is able to use it
					var currentGeometry =
openLayersParser.read(intersectableFeatures[j].geometry);
					

					//Compare with others
					for (var x = 0; x < intersectableFeatures.length; x++)
					{
						//compared fieature
						var comparefeature = intersectableFeatures[x];
						//parse it so the jsts framework is able to use it
						var compareGeometry =
openLayersParser.read(intersectableFeatures[x].geometry);
						//check if not same feature
						if(currentfeature.attributes.name === comparefeature.attributes.name)
						{
							continue;
						}
						else
						{
							//the jsts method
							var isOverlaping = currentGeometry.overlaps(compareGeometry);
							
							if(isOverlaping &&
alreadyOverlapping[currentfeature.attributes.name] == undefined)
							{
								alreadyOverlapping[comparefeature.attributes.name] = "";
								alert(currentfeature.attributes.name + " intersects with: " +
comparefeature.attributes.name);
								
							}
					
						}
					}											
				}

the priorityLayerArray[] is an array where i save different layers, so the
priorityLayerArray[i] is the layer i want to check if it has some features
wich intersects.

Greetings peter


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