11 files changed, 197 insertions, 111 deletions

diff --git a/src/controller/callbacks/reshape.c b/src/controller/callbacks/reshape.c
index 2455ea3..fec5443 100644
--- a/src/controller/callbacks/reshape.c
+++ b/src/controller/callbacks/reshape.c
@@ -3,6 +3,8 @@
 #include "../actions/set_ortho.h"
 #include "reshape.h"
 #include <GL/glut.h>
+#include <math.h>
+#include <stdio.h>
 
 #define S state0
 
@@ -13,26 +15,60 @@ reshape (int w, int h)
   glLoadIdentity ();
 
   /*
-   * This scaling produces an odd effect when the coordinates are not
-   * centered at 0,0.  When 0,0 is the lower left rather than the
-   * center this reshape is a bit unnatural since the image is not
-   * centered in the middle of the window.
+   * Scale the zoom region to the aspect ratio of the window.
    */
-
-  if (w <= h)
+  if (S.zoom.active)
     {
-      S.ortho.min_x = S.ortho_min;
-      S.ortho.max_x = S.ortho_max;
-      S.ortho.min_y = S.ortho_min * (double) h / (double) w;
-      S.ortho.max_y = S.ortho_max * (double) h / (double) w;
+      if (w >= h)
+        {
+          double scale 
+            = ( ( (S.zoom.coords[1] - S.zoom.coords[0]) * ((double) w / (double) h) )
+                - (S.zoom.coords[1] - S.zoom.coords[0]) )
+            * 0.5;
+
+          S.ortho.min_x = S.zoom.coords[0] - scale;
+          S.ortho.max_x = S.zoom.coords[1] + scale; 
+          S.ortho.min_y = S.zoom.coords[2];
+          S.ortho.max_y = S.zoom.coords[3];
+        }
+      else
+        {
+          double scale 
+            = ( ( (S.zoom.coords[3] - S.zoom.coords[2]) * ((double) h / (double) w) )
+                - (S.zoom.coords[3] - S.zoom.coords[2]) )
+            * 0.5;
+          
+          S.ortho.min_x = S.zoom.coords[0];
+          S.ortho.max_x = S.zoom.coords[1];
+          S.ortho.min_y = S.zoom.coords[2] - scale;
+          S.ortho.max_y = S.zoom.coords[3] + scale;
+        }
     }
-  else
+
+  else 
     {
-      S.ortho.min_x = S.ortho_min * (double) w / (double) h;
-      S.ortho.max_x = S.ortho_max * (double) w / (double) h;
-      S.ortho.min_y = S.ortho_min;
-      S.ortho.max_y = S.ortho_max;
-    }
+      /*
+       * This scaling produces an odd effect when the coordinates are
+       * not centered at 0,0.  When 0,0 is the lower left rather than
+       * the center this reshape is a bit unnatural since the image is
+       * not centered in the middle of the window.  Try chaning this
+       * to use the method used above for the zoom region scaling.
+       */
+      if (w <= h)
+        {
+          S.ortho.min_x = S.ortho_min;
+          S.ortho.max_x = S.ortho_max;
+          S.ortho.min_y = S.ortho_min * (double) h / (double) w;
+          S.ortho.max_y = S.ortho_max * (double) h / (double) w;
+        }
+      else
+        {
+          S.ortho.min_x = S.ortho_min * (double) w / (double) h;
+          S.ortho.max_x = S.ortho_max * (double) w / (double) h;
+          S.ortho.min_y = S.ortho_min;
+          S.ortho.max_y = S.ortho_max;
+        }
+    }  
 
   set_ortho ();