draw on paint of picturebox1

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C#

hello, i want when i click on button1 draw a ellipse on paint of picturebox1.

Posted 31-Jan-14 9:08am

Bakhos Sayssouk

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Solution 2

You can do it, but it simply makes little to no sense. This is the same as drawing on a bitmap, but with extra hassles which won't give you anything good. Doing such thing is easy enough, only don't use PictureBox, it does not have such purpose, only helpful if you need static images. Please see my past answers:
Append a picture within picturebox[^],
draw a rectangle in C#[^],
How do I clear a panel from old drawing[^].

See also:
What kind of playful method is Paint? (DataGridViewImageCell.Paint(...))[^],
capture the drawing on a panel[^],
Drawing Lines between mdi child forms[^].

—SA

Posted 31-Jan-14 14:13pm

Sergey Alexandrovich Kryukov

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OriginalGriff · Accepted Answer · 2014-01-31T09:19:00

Handle the Paint event, and draw an ellipse on the supplied Graphics object:

C#

private bool drawIt = false;
private void myButton_Click(object sender, EventArgs e)
    {
    drawIt = !drawIt;
    myPictureBox.Invalidate();
    }

private void myPictureBox_Paint(object sender, PaintEventArgs e)
    {
    if (drawIt)
        {
        e.Graphics.DrawEllipse(Pens.Red, 10, 10, myPictureBox.Width - 20, myPictureBox.Height - 20);
        }
    }