Determine on mouseclick wheather point lies inside an defined ellipse

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Dear friends,

I have created an ellipse over picture box , now I want when I click on picture box it should tell weather I have clicked "Inside" defined ellipse or "Outside".

Please friends help me..

I want to do this on PictureBox_MouseClick() event.....

My paint event code is below.

C#

private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {
            Color c1 = Color.FromArgb(50, Color.Green);
            foreach (Rectangle rect in listRect)
            {
                using (Pen pen = new Pen(Color.Red, 2))
                {
                    e.Graphics.DrawEllipse(pen, rect.X, rect.Y, rect.Width, rect.Height);
                    e.Graphics.FillEllipse(new SolidBrush(c1), rect.X, rect.Y, rect.Width, rect.Height);
                   
                }
            }           
        }

Posted 23-Nov-12 0:40am

Ajit Kumar Pal

Updated 23-Nov-12 1:15am

v3

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Tamer Hatoum · Accepted Answer · 2012-11-23T01:47:00

Solution 1

you can do one simple trick in case if the picturebox background for example is white and the eclipse is green , so you can play in that by getting the color of the point clicked and compared if it is green or not ...

C#

PictureBox_MouseClick(object j,eve.... e){

Color colorAtPoint = img.GetPixel(e.x, e.y);
 // check if color == green 
}

Regards...

Posted 23-Nov-12 1:47am

Tamer Hatoum

Comments

Ajit Kumar Pal 23-Nov-12 23:44pm

I have an color image in background which may vary also,,then how could I compare ?

OriginalGriff · Accepted Answer · 2012-11-23T01:54:00

Solution 2

Try this:

C#

Region r = new Region(myPictureBox.Size);
GraphicsPath elipse = new GraphicsPath();
elipse.AddEllipse(rect);
r.Union(elipse);
if (r.IsVisible(point))
    {
    ...
    }

Posted 23-Nov-12 1:54am

OriginalGriff

Comments

Ajit Kumar Pal 24-Nov-12 0:02am

Region is not considering (picturebox.size)?

Ajit Kumar Pal 24-Nov-12 1:07am

Thanks buddy I got it right..Thank you vary much

OriginalGriff 24-Nov-12 2:36am

You're welcome!