From e12911ab4f43b83aa86d92723ebe59231dd16d6b Mon Sep 17 00:00:00 2001
From: Don Pellegrino <don@drexel.edu>
Date: Thu, 18 Jun 2009 21:14:12 +0000
Subject: Implemented zooming.

---
diff --git a/src/controller/exp004mouse.c b/src/controller/exp004mouse.c
index 72791d5..fb753d6 100644
--- a/src/controller/exp004mouse.c
+++ b/src/controller/exp004mouse.c
@@ -1,12 +1,14 @@
 #include "exp004mouse.h"
 #include "exp004processhits.h"
 #include "exp004reshape.h"
+#include "set_ortho.h"
 #include "../view/exp004geometry.h"
 #include "../view/exp004state0.h"
 #include "../util/check_error.h"
 #include "../util/pick_convert.h"
 #include <GL/glut.h>
 #include <stdio.h>
+#include <math.h>
 
 /*
  * A simple alias to make the code more readable.
@@ -18,31 +20,70 @@ exp004mouse (int button, int state, int x, int y)
 {
   if (button == GLUT_LEFT_BUTTON && state == GLUT_UP)
     {
-      if (S.selecting == true && S.zoom == true)
+      if (S.selection.active && S.selection.purpose == ZOOM)
 	{
-	  GLint viewport[4];
-	  glGetIntegerv (GL_VIEWPORT, viewport);
-
-	  glMatrixMode (GL_PROJECTION);
-	  glLoadIdentity ();
+	  /*
+	   * NOOP if the mouse was not moved.
+	   */
+	  if (x == S.selection.x || y == S.selection.y)
+	    return;
 
 	  /*
 	   * Convert the selection boundary from window coordinates to
 	   * world coordinates.
 	   */
+	  glMatrixMode (GL_MODELVIEW);
+	  glLoadIdentity ();
+	  GLdouble model[16];
+	  glGetDoublev (GL_MODELVIEW_MATRIX, model);
+	  GLdouble projection[16];
+	  glGetDoublev (GL_PROJECTION_MATRIX, projection);	  
+	  GLint viewport[4];
+	  glGetIntegerv (GL_VIEWPORT, viewport);
 
-	  gluOrtho2D(-20.0,
-		     20.0,
-		     -20.0,
-		     20.0);      
+	  check_error (__FILE__, __LINE__);
+
+	  GLdouble start_position[3];	  
+	  gluUnProject (S.selection.x,
+			viewport[3] - S.selection.y,
+			0,
+			model,
+			projection,
+			viewport,
+			&start_position[0],
+			&start_position[1],
+			&start_position[2]);
+
+	  check_error (__FILE__, __LINE__);
+
+	  GLdouble end_position[3];
+	  gluUnProject (x,
+			viewport[3] - y,
+			0,
+			model,
+			projection,
+			viewport,
+			&end_position[0],
+			&end_position[1],
+			&end_position[2]);	 
 
+	  check_error (__FILE__, __LINE__);	       	  
+       
+	  S.zoom.active = true;
+	  S.zoom.coords[0] = fmin (start_position[0], end_position[0]);
+	  S.zoom.coords[1] = fmax (start_position[0], end_position[0]);
+	  S.zoom.coords[2] = fmin (start_position[1], end_position[1]);
+	  S.zoom.coords[3] = fmax (start_position[1], end_position[1]);
+
+	  exp004reshape (S.viewport.w, S.viewport.h);
+		     
 	  glutPostRedisplay ();
 	}
 
       /*
        * Complete a selection if one was started and not cancelled.
        */
-      if (S.selecting == true && S.zoom == false)
+      if (S.selection.active && S.selection.purpose == SET)
 	{
 	  
 	  /*
@@ -83,7 +124,7 @@ exp004mouse (int button, int state, int x, int y)
 	  double c_y = 0.0;
 	  double w = 0.0;
 	  double h = 0.0;
-	  pick_convert (S.select_x, S.select_y, x, y,
+	  pick_convert (S.selection.x, S.selection.y, x, y,
 			&c_x, &c_y, &w, &h);
 
 	  gluPickMatrix (c_x,
@@ -91,12 +132,9 @@ exp004mouse (int button, int state, int x, int y)
 			 w,
 			 h,
 			 viewport);	  
-	  
-	  gluOrtho2D(S.ortho.min_x,
-		     S.ortho.max_x,
-		     S.ortho.min_y,
-		     S.ortho.max_y);      
-	  
+
+	  set_ortho ();
+	  	  
 	  /*
 	   * "Alternately issue primitive drawing commands and commands to
 	   * manipulate the name stack so that each primitive of interest
@@ -126,9 +164,9 @@ exp004mouse (int button, int state, int x, int y)
 
   if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN)
     {
-      S.selecting = true;
-      S.select_x = x;
-      S.select_y = y;
+      S.selection.active = true;
+      S.selection.x = x;
+      S.selection.y = y;
     }
 
   return;
--
cgit v0.8.3.1-22-g547a