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tracks: Scale thickness of "no track here" crosses

Simply replace the calls to draw_line with calls to draw_thick_line.

We need to choose a thickness parameter.  The preferred tile size is
30, and the "draw_line" function draws a 1-pixel line, so the
thickness right now is 1/30 the tile size, at the preferred size.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

--- a/tracks.c

+++ b/tracks.c

@@ -1719,6 +1719,7 @@

 #define BORDER (TILE_SIZE/8)

 #define BORDER_WIDTH (max(TILE_SIZE / 32, 1))

+#define LINE_THICK (TILE_SIZE/30)

 #define COORD(x) ( (x+1) * TILE_SIZE + BORDER )

 #define CENTERED_COORD(x) ( COORD(x) + TILE_SIZE/2 )

@@ -2389,8 +2390,8 @@

                            (flags_drag & DS_NOTRACK) == DS_NOTRACK, &c);

     if (flags_best) {

         off = HALFSZ/2;

-        draw_line(dr, cx - off, cy - off, cx + off, cy + off, c);

-        draw_line(dr, cx - off, cy + off, cx + off, cy - off, c);

+        draw_thick_line(dr, LINE_THICK, cx - off, cy - off, cx + off, cy + off, c);

+        draw_thick_line(dr, LINE_THICK, cx - off, cy + off, cx + off, cy - off, c);

     }

     c = COL_TRACK;

@@ -2404,8 +2405,8 @@

             cx += (d == R) ? t2 : (d == L) ? -t2 : 0;

             cy += (d == D) ? t2 : (d == U) ? -t2 : 0;

-            draw_line(dr, cx - off, cy - off, cx + off, cy + off, c);

-            draw_line(dr, cx - off, cy + off, cx + off, cy - off, c);

+            draw_thick_line(dr, LINE_THICK, cx - off, cy - off, cx + off, cy + off, c);

+            draw_thick_line(dr, LINE_THICK, cx - off, cy + off, cx + off, cy - off, c);

         }

     }