I forgot to insert all your line drawing code BEFORE the cairo_clip call
in my snippet. Hopefully you figured that out though.
Julian
On 04/03/2011 09:55 PM, Curtis C. Pope wrote:
> OK...I'm making progress. I was able to identify the geometry and store
> the nets in an array. I wrote the following snippet to try to draw the
> path and clip:
>
> j = 0;
> cairo_new_path(cr);
> draw_cairo_move_to(cr, border[0]->start_x, border[0]->start_y, FALSE);
> while ( border[j] != NULL){
> draw_cairo_line_to(cr, border[j]->stop_x, border[j]->stop_y);
> j++;
> }
> cairo_clip(cr);
>
> It is clipping, but it is clipping everything. I have a feeling that
> there is some translation of the gerber coordinates to cairo coordinates
> going on in other routines before these draw operations would normally
> be called and my border isn't being set properly in the screen. The
> coordinates look like this:
>
> Border 0: sX=0.010100, sY=0.010100, eX=0.010100, eY=2.097100
> Border 1: sX=0.010100, sY=2.097100, eX=1.209300, eY=2.097100
> Border 2: sX=1.209300, sY=2.097100, eX=1.209300, eY=0.010100
> Border 3: sX=1.209300, sY=0.010100, eX=0.010100, eY=0.010100
>
> where sX/Y = StartX/Y and eX/Y = StopX/Y
>
> Obviously this is inches where cairo is probably looking for something else.
>
> Any pointers in the right direction would help.
>
> Thanks,
> Curtis
>
> On 4/2/2011 11:52 AM, Julian Lamb wrote:
>> Curtis,
>>> With that array of segments, I could then use cairo to draw the
>>> background before rendering the layers. I could tell it to "subtract"
>>> the soldermask from the background as the first step and then continue
>>> placing the other layers.
>> I don't think the overall board clipping would be that hard, since
>> cairo will do it quite simply. Once you extract the geometry you want
>> for the edge, you create a cairo target, draw a path along the outside
>> of the board, and then call cairo_clip. Then you just pass that cairo
>> target to the normal rendering routines and nothing will be drawn
>> outside of the board edges. You may have to review the gerbv code and
>> figure out which translation "frame" to draw the edge in, though (the
>> current transform matrix will have to be zoomed in to the correct level,
>> etc). I think that will give you the appearance you desire.
>>
>> Julian
>>
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>
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