Exercise 1.2 Viewing - set Eye parameter

1 files changed, 23 insertions, 2 deletions

diff --git a/src/RobotRace.java b/src/RobotRace.java
index 9d6c9b4..6b9cc44 100644
--- a/src/RobotRace.java
+++ b/src/RobotRace.java
@@ -7,6 +7,7 @@ import static javax.media.opengl.GL2.*;
 import javax.swing.UIManager;
 import robotrace.Base;
 import robotrace.Vector;
+import static java.lang.Math.*;
 
 /**
  * Handles all of the RobotRace graphics functionality,
@@ -151,7 +152,7 @@ public class RobotRace extends Base {
         // Set the perspective.
         // Modify this to meet the requirements in the assignment.
         glu.gluPerspective(40, (float)gs.w / (float)gs.h, 0.1, 100);
-        
+
         // Set camera.
         gl.glMatrixMode(GL_MODELVIEW);
         gl.glLoadIdentity();
@@ -538,7 +539,27 @@ public class RobotRace extends Base {
          * on the camera's default mode.
          */
         private void setDefaultMode() {
-            // code goes here ...
+            /*        z |
+             *          |   vDist %
+             *          |    %    * Ey
+             *          |%________*________ y
+             *      Ex /    %     *
+             *      /        s %  *
+             * x /  - - - - - - - *
+             *           Ey
+             * E = (Ex, Ey, Ez)
+             * sin phi  = Ez / vDist => Ez = vDist * sin phi
+             * cos phi = s / vDist => s = vDist * cos phi
+             * Ex = s * sin theta
+             * Ey = s * cos theta
+             */
+            float Ex, Ey, Ez, s;
+            Ez = gs.vDist * (float) sin(gs.phi);
+            s = gs.vDist * (float) cos(gs.phi);
+            Ex = s * (float) sin(gs.theta);
+            Ey = s * (float) cos(gs.theta);
+
+            eye = new Vector(Ex, Ey, Ez);
         }
         
         /**