Question

I am new to c#(using visual c# 2010), and was tying to make a simple game, it will have bouncing ball type thing,

I used graphics fillellipse to make a ball, now i have this code with me,

protected override void OnPaint( PaintEventArgs e)
{
    //System.Drawing.Graphics gobj;
    gobj = this.CreateGraphics();
    Pen pen = new Pen(System.Drawing.Color.LightSkyBlue, 6);
    SolidBrush brush = new SolidBrush(System.Drawing.Color.Magenta);
    Rectangle myRectangle = new Rectangle((PointToClient(Cursor.Position).X), PointToClient(Cursor.Position).Y, 250, 200);

    gobj.DrawRectangle(pen, myRectangle);
    gobj.FillEllipse(brush, myRectangle);
} 

when i run this code, i keep on getting many circles and rectangles, popping under a section of screen only, but shouldn’t it draw just a single circle??

Please help me understand this??

Answer 1

You drawing rectangle with DrawRectangle method and then circle with FillEllipse, you need to use just FillEllipse. And like Mikant mentioned you don’t need to create graphics – use e.Graphics. Here is code:

protected override void OnPaint(PaintEventArgs e)
{
    SolidBrush brush = new SolidBrush(System.Drawing.Color.Magenta);
    e.Graphics.FillEllipse(brush, (this.Height / 2) - 40, (this.Width / 2) - 40, 80, 80);
}

This draws circle in form centre.

Good luck in experimenting and learning!