real mouse rotate.

cube.c

@@ -205,9 +205,11 @@ void * cube_main(void * arg) {
      * will occur without any porting whatsoever.
      */
 
-    int i,j,k; 
+    int i,j,k;
     while(1) {
-        sine_wave(50);
+        /*sine_wave(50);*/
+        /*cube_static(50);*/
+        cube_dance(50);
     }
     return NULL;
 }

opengl.c

@@ -11,19 +11,20 @@
 #include "cube.h"
 
 #define SPACING .1
- 
+
 // ----------------------------------------------------------
 // Function Prototypes
 // ----------------------------------------------------------
 void display();
 void specialKeys();
- 
+
 // ----------------------------------------------------------
 // Global Variables
 // ----------------------------------------------------------
-double rotate_y=0; 
+double rotate_y=0;
 double rotate_x=0;
-
+int clicked=0;
+int prev_x=0, prev_y=0, x_diff=0, y_diff=0;
 // ----------------------------------------------------------
 // display() Callback function
 // ----------------------------------------------------------
@@ -37,26 +38,28 @@ void display(){
 
   //  Clear screen and Z-buffer
   glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
- 
+
   // Reset transformations
   glLoadIdentity();
   glLightfv(GL_LIGHT0, GL_AMBIENT, LightAmbient);  /*  add lighting. (ambient) */
   glLightfv(GL_LIGHT0, GL_DIFFUSE, LightDiffuse);  /*  add lighting. (diffuse). */
   glLightfv(GL_LIGHT0, GL_POSITION,LightPosition); /*  set light position. */
   glEnable(GL_LIGHT0);                      /*  turn light 0 on. */
- 
+
   // Other Transformations
   // glTranslatef( 0.1, 0.0, 0.0 );      // Not included
   // glRotatef( 180, 0.0, 1.0, 0.0 );    // Not included
- 
+
   // Rotate when user changes rotate_x and rotate_y
   glRotatef( rotate_x, 1.0, 0.0, 0.0 );
   glRotatef( rotate_y, 0.0, 1.0, 0.0 );
-
+  glRotatef( x_diff, 1.0, 0.0, 0.0 );
+  glRotatef( y_diff, 0.0, 1.0, 0.0 );
+
   // Other Transformations
   // glScalef( 2.0, 2.0, 0.0 );          // Not included
   glPointSize(10.0); // 10 pixel dot!
- 
+
   //Multi-colored side - FRONT
   //set_plane(X_AXIS, 0, 3);
   //set_plane(Z_AXIS, 3, 3);
@@ -79,50 +82,84 @@ void display(){
   glutSwapBuffers();
 
 }
- 
+
 // ----------------------------------------------------------
 // specialKeys() Callback Function
 // ----------------------------------------------------------
 void specialKeys( int key, int x, int y ) {
- 
+
   //  Right arrow - increase rotation by 5 degree
   if (key == GLUT_KEY_RIGHT)
     rotate_y += 5;
- 
+
   //  Left arrow - decrease rotation by 5 degree
   else if (key == GLUT_KEY_LEFT)
     rotate_y -= 5;
- 
+
   else if (key == GLUT_KEY_UP)
     rotate_x += 5;
- 
+
   else if (key == GLUT_KEY_DOWN)
     rotate_x -= 5;
- 
+
   //  Request display update
   glutPostRedisplay();
- 
+
 }
-
+void mouse(int btn, int press, int x, int y){
+    if(btn==0 && press==0){
+        //left mouse clicked down
+        clicked = 1;
+    }
+    else if(btn==0 && press==1){
+        if(clicked){
+            //left mouse click up
+            clicked = 0;
+        }
+    }
+
+}
+
+void mouseMotion(int x, int y){
+    //y = y_height-y;
+    if(clicked){
+        if(prev_x || prev_y ){
+            x_diff=prev_x-x;
+            y_diff=prev_y-y;
+            rotate_x+=x_diff;
+            rotate_y+=y_diff;
+            prev_x=x;
+            prev_y=y;
+        }
+        else{
+            //transition from 0,0 to first point
+            prev_x=x;
+            prev_y=y;
+        }
+    }
+}
+
 // ----------------------------------------------------------
 // main() function
 // ----------------------------------------------------------
 void * opengl_init(void * arg){
 
   //  Request double buffered true color window with Z-buffer
   glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
- 
+
   glutInitWindowSize(800, 800);
   // Create window
   glutCreateWindow("Awesome Cube");
- 
+
   //  Enable Z-buffer depth test
   glEnable(GL_DEPTH_TEST);
   // Callback functions
   glutDisplayFunc(display);
   glutIdleFunc(display);
   glutSpecialFunc(specialKeys);
-
+  glutMouseFunc(mouse);
+  glutMotionFunc(mouseMotion);
+
   //  Pass control to GLUT for events
   glutMainLoop();
   return NULL;