Re: an issue with circles in circles

Sort of.  By default, circles are filled.  The perimeter is drawn with the 
pen, the inside is drawn with a brush.  You just need to set an empty brush.

dc.SetBrush(*wxTRANSPARENT_BRUSH);

On Wednesday, November 10, 2021 at 4:33:01 PM UTC-8 [email protected] 
wrote:

> Hi there,
>
>
> I'm having a little issue with drawing a circle within a circle, within 
> a cirlce.
>
> I've bound to the wx.EVT_PAINT event, have a black pen with width 4 and 
> color black on a unmodified frame background.
>
>
> The following code draws a box on the screen and splits it up the middle:
>
>   size=self.GetClientSize()
>   tpx=int(size.x/10)
>   tpy=int(size.y/10)
>   dc.DrawLine(tpx*2, tpy*2, tpx*8, tpy*2)
>   dc.DrawLine(tpx*2, tpy*8, tpx*8, tpy*8)
>   dc.DrawLine(tpx*2, tpy*2, tpx*2, tpy*8)
>   dc.DrawLine(tpx*8, tpy*2, tpx*8, tpy*8)
>   dc.DrawLine(tpx*5, tpy*2, tpx*5, tpy*8)
>
>
> The following two variables set the center point for the left and right 
> boxes.
>
>   lc=[int(tpx*4), tpy*4]
>   rc=[int(tpx*6), tpy*4]
>
>
> I have a list of numbers like the following:
>
> shells=[[4, []], [6, []], [8, []]
>
>
> I then draw the circles as follows:
>
> for x in shells:
>
>  dc.DrawCircle(lc[0], lc[1], (size.x/100)*x[0])
>
>
> When this code is run, it draws the first central circle when it is 
> added, but the more circles i add to the list, instead of drawing circle 
> B around Circle A, it deletes Circle A and just draws a bigger circle B.
>
> Is this to do with overlapping backgrounds?
>
> I'm confused!
>
>
> Best,
>
> Nathan
>
>

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