We will create an array of points, then use a brush to draw a filled polygon at the point clicked. Then we will use a pen to draw a border around the triangle.
Add this code to the MouseClick event:
private void Form1_MouseClick(object sender, MouseEventArgs e) { // Get the graphics of the form. Graphics g = this.CreateGraphics(); // Create a green pen. Pen myPen = new Pen(Color.DarkGreen,3); // Create a blue brush. SolidBrush myBrush= new SolidBrush(Color.CornflowerBlue); // Create 3 points, and make array. Point pt1 = new Point(e.X-15, e.Y); Point pt2 = new Point(e.X+15, e.Y); Point pt3 = new Point(e.X, e.Y + 15); Point[] points = { pt1, pt2, pt3}; // Fill a triangle using the array of points. g.FillPolygon(myBrush, points); // Draw a triangle using the array of points. g.DrawPolygon(myPen, points); }
