implement camera rotation on chase camera

gloom-rs/src/draw.rs

@@ -77,6 +77,17 @@ impl ChaseCamera {
             yaw: 0.0
         }
     }
+
+    pub fn forward(&self) -> glm::Vec3 {
+        let f_xz = glm::vec3(-self.yaw.sin(), self.yaw.cos(), 0.0);
+        glm::vec3(f_xz.x, f_xz.z, f_xz.y)
+    }
+
+    pub fn right(&self) -> glm::Vec3 {
+        let f_xz = glm::vec3(-self.yaw.sin(), self.yaw.cos(), 0.0);
+        let r_xz = glm::rotation2d(glm::half_pi()) * f_xz;
+        glm::vec3(r_xz.x, r_xz.z, r_xz.y)
+    }
 }
                 
 pub struct World {

gloom-rs/src/main.rs

@@ -135,10 +135,24 @@ fn main() {
                 }
             }
 
+            let translation_speed = 1.0;
+
             // Handle keyboard input
             if let Ok(keys) = pressed_keys.lock() {
                 for key in keys.iter() {
                     match key {
+                        VirtualKeyCode::Right => { 
+                            world.camera.position -= world.camera.right() * translation_speed;
+                        }
+                        VirtualKeyCode::Left => { 
+                            world.camera.position += world.camera.right() * translation_speed;
+                        }
+                        VirtualKeyCode::Down => { 
+                            world.camera.position.y -= translation_speed;
+                        }
+                        VirtualKeyCode::Up => { 
+                            world.camera.position.y += translation_speed;
+                        }
                         _ => { }
                     }
                 }