"rzed" <[EMAIL PROTECTED]> wrote:
> If I have the correct version of the PIL code, specifying the new width
> parameter to ImageDraw's line() function results in a line of twice the
> specified thickness. It appears to be because, in ImagingDrawWideLine
> (Draw.c), the width is both added to and subtracted from the line
> positions. If dx and dy were halved, the specification should work
> correctly (within rounding limits, anyway).
>
> dx = (int) (d * (y1-y0) + 0.5);
> dy = (int) (d * (x1-x0) + 0.5);
>
> add_edge(e+0, x0 - dx, y0 + dy, x1 - dx, y1 + dy);
> add_edge(e+1, x1 - dx, y1 + dy, x1 + dx, y1 - dy);
> add_edge(e+2, x1 + dx, y1 - dy, x0 + dx, y0 - dy);
> add_edge(e+3, x0 + dx, y0 - dy, x0 - dx, y0 + dy);
>
> To an extent, it can be worked around by halving the width
> specification, of course.
I've attached the 'official' patch.
</F>
Index: libImaging/Draw.c
===================================================================
--- libImaging/Draw.c (revision 2434)
+++ libImaging/Draw.c (working copy)
@@ -674,7 +675,7 @@
return 0;
}
- d = width / sqrt(dx*dx + dy*dy);
+ d = width / sqrt(dx*dx + dy*dy) / 2.0;
dx = (int) (d * (y1-y0) + 0.5);
dy = (int) (d * (x1-x0) + 0.5);
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