☁ Add sky

1 files changed, 34 insertions, 0 deletions

diff --git a/racer-tracer/src/camera.rs b/racer-tracer/src/camera.rs
new file mode 100644
index 0000000..5f0abbb
--- /dev/null
+++ b/racer-tracer/src/camera.rs
@@ -0,0 +1,34 @@
+use crate::image::Image;
+use crate::vec3::Vec3;
+
+#[derive(Clone)]
+pub struct Camera {
+    pub viewport_height: f64,
+    pub viewport_width: f64,
+    pub focal_length: f64,
+    pub origin: Vec3,
+    pub horizontal: Vec3,
+    pub vertical: Vec3,
+    pub lower_left_corner: Vec3,
+}
+
+impl Camera {
+    pub fn new(image: &Image, viewport_height: f64, focal_length: f64) -> Camera {
+        let viewport_width = image.aspect_ratio * viewport_height;
+        let origin = Vec3::new(0.0, 0.0, 0.0);
+        let horizontal = Vec3::new(viewport_width, 0.0, 0.0);
+        let vertical = Vec3::new(0.0, viewport_height, 0.0);
+        Camera {
+            viewport_height,
+            viewport_width,
+            focal_length,
+            origin,
+            horizontal,
+            vertical,
+            lower_left_corner: origin
+                - horizontal / 2.0
+                - vertical / 2.0
+                - Vec3::new(0.0, 0.0, focal_length),
+        }
+    }
+}