29 files changed, 1185 insertions, 0 deletions
diff --git a/src/controller/exp004mouse.c b/src/controller/exp004mouse.c
new file mode 100644
index 0000000..11117bf
--- a/dev/null
+++ b/src/controller/exp004mouse.c
@@ -0,0 +1,90 @@
+#include "exp004mouse.h"
+#include "exp004processhits.h"
+#include "../view/exp004geometry.h"
+#include "../view/exp004state0.h"
+#include "../util/check_error.h"
+#include <GL/glut.h>
+#include <stdio.h>
+
+#define SIZE 500
+#define N 3
+
+void
+exp004mouse (int button, int state, int x, int y)
+{
+
+  if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN)
+    {
+
+      /*
+       * "Specify the array to be used for the returned hit records
+       * with glSelectBuffer () [Redbook]."
+       */
+      GLuint select_buf[SIZE];
+      glSelectBuffer (SIZE, select_buf);
+
+      /*
+       * "Enter selection mode by specifying GL_SELECT with
+       * glRenderMode () [Redbook]."
+       */
+      glRenderMode (GL_SELECT);
+
+      /*
+       * "Initialize the name stack using glInitNames () and glPush
+       * Names () [Redbook]."
+       */
+      glInitNames ();
+      glPushName (0);
+
+      /*
+       * "Define the viewing volume you want to use for selection.
+       * Usually this is different from the viewing volume you
+       * originally used to draw the scene, so you probably want to
+       * save and then restore the current transformation state with
+       * glPushMatrix () and glPopMatrix () [Redbook]."
+       */
+      glMatrixMode (GL_PROJECTION);
+      glPushMatrix ();
+      glLoadIdentity ();
+
+      GLint viewport[4];
+      glGetIntegerv (GL_VIEWPORT, viewport);
+
+      gluPickMatrix ((GLdouble) x,
+		     (GLdouble) (viewport[3] - y),
+		     N,
+		     N,
+		     viewport);
+
+      gluOrtho2D(exp004state0.ortho.min_x,
+		 exp004state0.ortho.max_x,
+		 exp004state0.ortho.min_y,
+		 exp004state0.ortho.max_y);      
+
+      /*
+       * "Alternately issue primitive drawing commands and commands to
+       * manipulate the name stack so that each primitive of interest
+       * has appropriate names assigned [Redbook]."
+       */
+      exp004geometry (GL_SELECT);
+
+      glMatrixMode (GL_PROJECTION);      
+      glPopMatrix ();
+      glutSwapBuffers ();
+
+      /*
+       * "Exit selection mode and process the returned selection data
+       * (the hit records) [Redbook]."
+       */
+      GLint hits = glRenderMode (GL_RENDER);
+      check_error (__FILE__, __LINE__);
+      
+      /* "process hits from selection mode rendering [Angel,2008]." */
+      exp004processhits (hits, select_buf);
+      
+      /* "normal render [Angel,2008]." */      
+      glutPostRedisplay ();
+    }
+
+  return;
+}