# Finding Circumference points of Circle and Drawing Circle on windows Form.

Posted by SurajRane under C# category on | Views : 6614
We can draw circle on windows form using various functions provided by System.Drawing namespace. But using those methods will not give you points on circumference of circle which you may need sometime. Here I come up with solution to this problem.

We can find points on circumference using following mathematical formulas.
X = x0 + r Cos 0
Y = y0 + r Sin 0
Point on circumference = (X, Y) and
Center = (x0, y0)
An angle = 0
Here is the code for finding points and drawing the circle

`private void Form1_Paint(object sender, PaintEventArgs e){            //Graphics object             Graphics graphics = e.Graphics;            //array of points             PointF[] CircumferencePoints = new PointF[360];            //path type points to show direction             byte[] pathType = new byte[360];            //loop and collect points starting from angle 0 to 360            double THETA = 0.0;            for (int i = 0; i < 360; i++)            {                CircumferencePoints[i].X = (float)(200 + 100 * (Math.Cos(THETA * Math.PI / 180)));                CircumferencePoints[i].Y = (float)(200 + 100 * (Math.Sin(THETA * Math.PI / 180)));                //keep angle increasing by 1                THETA += 1.0;                //give path type                pathType[i] = (byte)PathPointType.Line;            }            //This smoothing is neccessary for High quality curve            graphics.SmoothingMode = SmoothingMode.HighQuality;            System.Drawing.Drawing2D.GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath(CircumferencePoints, pathType);            //Draw circle using Draw path method            graphics.DrawPath(new Pen(Brushes.Black, 3), path);            //Fill the circle with color            graphics.FillClosedCurve(Brushes.Orange, CircumferencePoints);}`