gEDA-dev: o_invalidate_rect() and extra margin for the line width

[Wojciech Kazubski]

Hello!
Taking the line width into account would be nice when exporting graphics. I 
often get EPS images cropped a bit too much. I have to place two very small 
pieces of very narrow line (1mil width or so) outside the opposite corners of 
the drawing to avoid cropping.

Wojciech Kazubski

> Hi Peter C, and B,
>
> when zoomed way in I have some drawing artefacts in the net mode.
>
> The net mode uses the variables second_x, last_x, start_x to spezify the
> invalidate rectangle:
>
> ---------
>   o_invalidate_rect(w_current, w_current->last_x, w_current->last_y,
>                            w_current->second_x, w_current->second_y);
> ---------
>
> This function call does not take care of the width of the net line.
>
> Possible fixes for the problem:
>
> * the caller calculates the correct rectangle
>   This has to be done many times and requires sorted coordinates
>   of the rectangle.
>
> * add an extra function parameter to o_invalidate_rect for extra margin
>
> * add some extra margin depending on the current line-width of the
> current graphic contexts inside o_invalidate_rectangle. (w_current->gc
> and w_current->xor_gc)
>
> What are your opinions?
>
> Regards
> Werner
>
>
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