shithub: puzzles

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Loopy: adjust clip rectangle for new line thickness.

It would have helped in the previous commit if I'd tried actually
_playing_ the game, not just admiring it in its initial state. When I
did, I found that lines weren't being fully overdrawn, which turned
out to be because the clip rectangle was being set too narrow.

--- a/loopy.c

+++ b/loopy.c

@@ -3231,10 +3231,10 @@

     grid_to_screen(ds, g, x1, y1, &x1, &y1);

     grid_to_screen(ds, g, x2, y2, &x2, &y2);

     /* Allow extra margin for dots, and thickness of lines */

-    xmin = min(x1, x2) - 2;

-    xmax = max(x1, x2) + 2;

-    ymin = min(y1, y2) - 2;

-    ymax = max(y1, y2) + 2;

+    xmin = min(x1, x2) - (ds->tilesize + 15) / 16;

+    xmax = max(x1, x2) + (ds->tilesize + 15) / 16;

+    ymin = min(y1, y2) - (ds->tilesize + 15) / 16;

+    ymax = max(y1, y2) + (ds->tilesize + 15) / 16;

     *x = xmin;

     *y = ymin;