Re: Re: an issue with circles in circles

Thanks Tim, this was just the thing.


Nathan

On 11/11/2021 21:22, Tim Roberts wrote:
> 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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