Exercise 1.2 Viewing (part 2)

This has odd behavior, modifying some perspective.

NOTE: vDist is modified using scrolling, vWidth is changed using
right-click + scroll.

1 files changed, 10 insertions, 2 deletions

diff --git a/src/RobotRace.java b/src/RobotRace.java
index 42850d1..608438f 100644
--- a/src/RobotRace.java
+++ b/src/RobotRace.java
@@ -150,8 +150,16 @@ public class RobotRace extends Base {
         gl.glLoadIdentity();
 
         // Set the perspective.
-        // Modify this to meet the requirements in the assignment.
-        glu.gluPerspective(40, (float)gs.w / (float)gs.h, 0.1, 100);
+        // angle = 2 arctan(vWidth / 2vDist)
+        float angle;
+
+        angle = 2f * (float) atan((0.5f * gs.vWidth) / gs.vDist);
+        // radians to degree (degree = rad / pi * 180)
+        angle = 180 * angle / (float) PI;
+        // lower than 1 would yield no picture, great values cause an "infinite" line segment
+        angle = max(1, min(179, angle));
+        glu.gluPerspective(angle, (float)gs.w / (float)gs.h,
+                0.1 * gs.vDist, 10.0 * gs.vDist);
 
         // Set camera.
         gl.glMatrixMode(GL_MODELVIEW);