Please can someone help me resolve the error in my code for checking intersect is added polygon overlaps.
if (e.Button == MouseButtons.Left)
if (e.Button == MouseButtons.Left)
{
//left click - fill array of coordinates
Coordinate coord = map1.PixelToProj(e.Location);
if (polygonmouseClick)
{
//first time left click - create empty line feature
if (firstClick)
{
//Create a new List called polygonArray.
//this list will store the Coordinates
//We are going to store the mouse click coordinates into this array.
List<Coordinate> polygonArray = new List<Coordinate>();
//Create an instance for LinearRing class.
//We pass the polygon List to the constructor of this class
LinearRing polygonGeometry = new LinearRing(polygonArray);
IFeatureLayer pFLayer = (IFeatureLayer)polygonArray;
//Add the polygonGeometry instance to PolygonFeature
IFeature polygonFeature = pFLayer.DataSet.AddFeature(polygonGeometry);
//add first coordinate to the polygon feature
polygonFeature.Coordinates.Add(coord);
// Return if no data layers exist
if (map1.Layers.Count < 1) return;
// Also, mpl can be used to change the selection color.
IMapPolygonLayer mpl = map1.Layers[0] as IMapPolygonLayer;
// If the first layer is not a polygon layer, exit.
if (mpl == null) return;
// Get the featureset that contains the actual polygon data for the layer
IFeatureSet fs = map1.Layers[0].DataSet as IFeatureSet;
// If this is null or not a featureset, exit
if (fs == null) return;
// Set up an index
int iShape = 0;
// Cycle through the shapes
foreach (DotSpatial.Data.ShapeRange shape in fs.ShapeIndices)
{
// Test if the coordinate is in the polygon
if (shape.Intersects(coord))
{
// Select the polygon if the the coordinate intersects.
mpl.Select(iShape);
}
iShape++;
}
firstClick = false;
}
else
{
//second or more clicks - add points to the existing feature
IFeature existingFeature = (IFeature)polygonF.Features[polygonF.Features.Count - 1];
existingFeature.Coordinates.Add(coord);
//refresh the map if line has 2 or more points
if (existingFeature.Coordinates.Count >= 3)
{
//refresh the map
polygonF.InitializeVertices();
map1.ResetBuffer();
}
}
}
}
else
{
//right click - reset first mouse click
firstClick = true;
}
break;
}
