I have a square picture. I need to draw a circle on it, and everything
outside that circle to be set to a certain color, so the image looks framed

On other words, I want to crop a circle form a rectangular picture

Any hints?

If it's a not huge image and it's not an old computer, the
straight forward solution is just to run over the picture
and compare pixel by pixel. Like the pseudocode here:

ry = heightInNbrOfPixels / 2
ry = widthInNbrOfPixels / 2
rSqr = min(heightInNbrOfPixels ,widthInNbrOfPixels) * _
min(heightInNbrOfPixels ,widthInNbrOfPixels)
for y = 1 to heightInNbrOfPixels
for x = 1 to widthInNbrOfPixels
if y*y + x*x > rSqr then _
setPixel(x,y) = white
next x
next y

>-----Original Message-----
>I have a square picture. I need to draw a circle on it,
and everything
>outside that circle to be set to a certain color, so the
image looks framed
>
>On other words, I want to crop a circle form a
rectangular picture
>
>Any hints?
>
>
>.
>

I havent looked, but when you do this on most graphics editors, you can fill
the area outside the circle, have you looked thru the libraries ( you
probably have, but just checking )

OHM

Crirus wrote:
> I have a square picture. I need to draw a circle on it, and everything
> outside that circle to be set to a certain color, so the image looks
> framed
>
> On other words, I want to crop a circle form a rectangular picture
>
> Any hints?

Hi Crirus,

Draw a circle with a very, very wide brush.

Regards,
Fergus

"Andreas Lundgren" <(E-Mail Removed)> scripsit:
>> I have a square picture. I need to draw a circle on it,
> and everything
>> outside that circle to be set to a certain color, so the
> image looks framed
>>
>> On other words, I want to crop a circle form a
> rectangular picture

Create an appropriate 'Region' from a 'GraphicsPath' and assign it to
the 'Graphics' object's 'Clip' property. Then draw the image onto the
canvas (filled with a solid brush before).

--
Herfried K. Wagner
MVP · VB Classic, VB.NET
<http://www.mvps.org/dotnet>