How do I create a windows form that is an ellipse

  • Thread starter Thread starter Tony Johansson
  • Start date Start date
T

Tony Johansson

Hi!

Normally when you create a form it's shape is a rectangle.
Now I want to create a windows form that is not a rectangle but an ellipse
instead
I wonder if anyone have some good example of code where this is done.

//Tony
 
Tony Johansson said:
Hi!

Normally when you create a form it's shape is a rectangle.
Now I want to create a windows form that is not a rectangle but an ellipse
instead
I wonder if anyone have some good example of code where this is done.

//Tony
Click to expand...
google shaped winform.
You create a background image with a transparent background for the bits you
don't want.
I've heard there are issues.
I think you're best learning WPF anyhow rather than winforms and it;s better
suited if your thing is irregularly shaped apps.
 
Tony Johansson said:
Normally when you create a form it's shape is a rectangle.
Now I want to create a windows form that is not a rectangle but an ellipse
instead
I wonder if anyone have some good example of code where this is done.
Click to expand...

There are two ways to do this. The first one has already been mentioned
in another reply, and is based on adding a bitmap to the background and
setting the transparency key of the form to one of the bitmap colors.
Another way is the following:

1. Create an event handler for the form's Paint event, or override the
OnPaint method.
2. Inside this method, create an instance of the GraphicsPath class.
3. Use the various methods of the GraphicsPath, such as AddEllipse or
AddPolygon, to determine the shape of the form.
4. Assign this GraphicsPath object to the Region property of the form.

private void Form1_Paint(object sender, PaintEventArgs e)
{
GraphicsPath gp = new GraphicsPath();

Rectangle rect = new Rectangle(0, 0, this.Width, this.Height);
rect.Inflate(-4, -4);
gp.AddEllipse(rect);

this.Region = new Region(gp);
}
 
Alberto Poblacion said:
There are two ways to do this. The first one has already been mentioned
in another reply, and is based on adding a bitmap to the background and
setting the transparency key of the form to one of the bitmap colors.
Another way is the following:

1. Create an event handler for the form's Paint event, or override the
OnPaint method.
2. Inside this method, create an instance of the GraphicsPath class.
3. Use the various methods of the GraphicsPath, such as AddEllipse or
AddPolygon, to determine the shape of the form.
4. Assign this GraphicsPath object to the Region property of the form.

private void Form1_Paint(object sender, PaintEventArgs e)
{
GraphicsPath gp = new GraphicsPath();

Rectangle rect = new Rectangle(0, 0, this.Width, this.Height);
rect.Inflate(-4, -4);
gp.AddEllipse(rect);

this.Region = new Region(gp);
}
Click to expand...

Many thanks for your answer. It works perfect!

//Tony
 
There are two ways to do this. The first one has already been mentioned
in another reply, and is based on adding a bitmap to the background and
setting the transparency key of the form to one of the bitmap colors.
Another way is the following:

1. Create an event handler for the form's Paint event, or override the
OnPaint method.
2. Inside this method, create an instance of the GraphicsPath class.
3. Use the various methods of the GraphicsPath, such as AddEllipse or
AddPolygon, to determine the shape of the form.
4. Assign this GraphicsPath object to the Region property of the form.

private void Form1_Paint(object sender, PaintEventArgs e)
{
GraphicsPath gp = new GraphicsPath();

Rectangle rect = new Rectangle(0, 0, this.Width, this.Height);
rect.Inflate(-4, -4);
gp.AddEllipse(rect);

this.Region = new Region(gp);
}
Click to expand...

You probably don't want to do this in the paint method. Just do it
once when the form is created. I believe that the region object needs
to be disposed, so if you keep overwriting the region property in the
paint event, the old region is left orphaned until it gets GC.

Chris
 
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