From 712b188c189ec9aca2ee5ff59b31abced5ce46f3 Mon Sep 17 00:00:00 2001
From: Ash Tyndall <git@atyndall.net>
Date: Tue, 18 Oct 2011 18:47:48 +0800
Subject: [PATCH]

---
 scene.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 60 insertions(+), 3 deletions(-)

diff --git a/scene.c b/scene.c
index eb5c537..15d8f9d 100644
--- a/scene.c
+++ b/scene.c
@@ -118,7 +118,15 @@ static GLfloat floorVertices[4][3] = {
 
 static GLfloat lightColor[] = {1.0, 1.0, 1.0, 1.0}; // White light
 static GLfloat lightPosition[4];
-static float lightAngle = 10.0, lightHeight = 20;
+
+int moving, startx, starty;
+int lightMoving = 0, lightStartX, lightStartY;
+
+/* Time varying or user-controled variables. */
+static float jump = 0.0;
+static float lightAngle = 0.0, lightHeight = 20;
+GLfloat angle = -150;   /* in degrees */
+GLfloat angle2 = 30;   /* in degrees */
 
 /**
  * Prints out error message when file cannot be read
@@ -498,10 +506,54 @@ void windowReshape(int w, int h) {
  * @param x Mouse x position
  * @param y Mouse y position
  */
-void mouse(int btn, int state, int x, int y) {
+/*void mouse(int btn, int state, int x, int y) {
   
+}*/
+static void
+mouse(int button, int state, int x, int y)
+{
+  if (button == GLUT_LEFT_BUTTON) {
+    if (state == GLUT_DOWN) {
+      moving = 1;
+      startx = x;
+      starty = y;
+    }
+    if (state == GLUT_UP) {
+      moving = 0;
+    }
+  }
+  if (button == GLUT_MIDDLE_BUTTON) {
+    if (state == GLUT_DOWN) {
+      lightMoving = 1;
+      lightStartX = x;
+      lightStartY = y;
+    }
+    if (state == GLUT_UP) {
+      lightMoving = 0;
+    }
+  }
 }
 
+static void
+motion(int x, int y)
+{
+  if (moving) {
+    angle = angle + (x - startx);
+    angle2 = angle2 + (y - starty);
+    startx = x;
+    starty = y;
+    glutPostRedisplay();
+  }
+  if (lightMoving) {
+    lightAngle += (x - lightStartX)/40.0;
+    lightHeight += (lightStartY - y)/20.0;
+    lightStartX = x;
+    lightStartY = y;
+    glutPostRedisplay();
+  }
+}
+
+
 /**
  * Draw a floor.
  */
@@ -539,7 +591,7 @@ void display() {
   gluLookAt(
     0.0, 0.0, 60.0,  /* eye is at (x,y,z) */
     0.0, 0.0,  0.0,  /* center is at (x,y,z) */
-    0.0, 1.0,  1.0   /* up is in postivie Y direction */
+    0.0, 1.0,  0.0   /* up is in postivie Y direction */
     );
 
   /* Reposition the light source. */
@@ -549,6 +601,10 @@ void display() {
   lightPosition[3] = 0.0;
 
   glPushMatrix();
+      /* Perform scene rotations based on user mouse input. */
+    glRotatef(angle2, 1.0, 0.0, 0.0);
+    glRotatef(angle, 0.0, 1.0, 0.0);
+
     glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
 
     glEnable(GL_BLEND);
@@ -643,6 +699,7 @@ int main(int argc, char **argv) {
   glutReshapeFunc(windowReshape);
   glutDisplayFunc(display);
   glutMouseFunc(mouse);
+  glutMotionFunc(motion);
 
   makeMenu();
 
-- 
2.20.1