# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1381765179 0
# Node ID 448730147f030b45637ae5d5fb7a8f265da1ec93
# Parent  e037b6ad9b714c4bc0b5d9fe0ff25ec7958091da
Added direction labels for the most central elevation.

diff -r e037b6ad9b71 -r 448730147f03 gui.c
--- a/gui.c	Mon Oct 14 14:36:36 2013 +0000
+++ b/gui.c	Mon Oct 14 15:39:39 2013 +0000
@@ -111,21 +111,23 @@
 void gui_sky(vectorf *viewx, vectorf *viewy, vectorf *viewz)
 {
     double direction, elevation;
-    int d, e, estart, efinish, dcount;
+    int d, e, eclosest, estart, efinish, dcount;
     int16_t lastminx, lastminy, thisminx, thisminy,
             lastmaxx, lastmaxy, thismaxx, thismaxy;
     uint32_t colour;
     vectorf point;
+    char buffer[5];
 
     direction = vectorf_direction(viewz);
     elevation = vectorf_elevation(viewz);
 
     d = closest(raddeg(direction), SKY_GRID_STEP);
+    eclosest = closest(raddeg(elevation), SKY_GRID_STEP);
 
     /* Plot points between elevations -90 and 90 degrees. */
 
-    estart = max(-90, closest(raddeg(elevation), SKY_GRID_STEP) - (SKY_GRID_STEP * 3));
-    efinish = min(90, closest(raddeg(elevation), SKY_GRID_STEP) + (SKY_GRID_STEP * 3));
+    estart = max(-90, eclosest - (SKY_GRID_STEP * 3));
+    efinish = min(90, eclosest + (SKY_GRID_STEP * 3));
 
     for (e = estart; e <= efinish; e += SKY_GRID_STEP)
     {
@@ -196,6 +198,16 @@
                 break;
             }
 
+            /* Write labels for the most central set of points. */
+
+            if (e == eclosest)
+            {
+                sprintf(buffer, "%d", d - dcount);
+                stringRGBA(screen, thisminx, thisminy, buffer, 255, 255, 255, 255);
+                sprintf(buffer, "%d", d + dcount);
+                stringRGBA(screen, thismaxx, thismaxy, buffer, 255, 255, 255, 255);
+            }
+
             lastminx = thisminx; lastminy = thisminy;
             lastmaxx = thismaxx; lastmaxy = thismaxy;
         }