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Sample code that demonstrates the creation of a new polygon from random points and calculating the area

using DotSpatial.Topology; using DotSpatial.Common; private void btnPolygon_Click(object sender, EventArgs e) { //creates a new coordinate array Coordinate[] coords = new Coordinate[10]; //creates a random point variable Random rnd = new Random(); //Creates the center coordiante for the new polygon Coordinate center = new Coordinate((rnd.NextDouble() * 360) - 180, (rnd.NextDouble() * 180) - 90); //a for loop that generates a new random X and Y value and feeds those values into the coordinate array for (int i = 0; i < 10; i++) { coords[i] = new Coordinate(center.X + Math.Cos((i * 2) * Math.PI / 18), center.Y + (i * 2) * Math.PI / 18); } //creates a new polygon from the coordinate array coords[9] = new Coordinate(coords[0].X, coords[0].Y); Polygon pg = new Polygon(coords); //new variable for the area of the polgyon Double area; area = pg.Area; //displays the area of the polygon MessageBox.Show("The Area of the polygon is: " + area); }

Last edited May 20, 2015 at 10:56 PM by mbayles, version 5