Add a camera class

1 files changed, 22 insertions, 0 deletions

diff --git a/src/camera.cpp b/src/camera.cpp
new file mode 100644
index 0000000..cd43359
--- /dev/null
+++ b/src/camera.cpp
@@ -0,0 +1,22 @@
+#include "camera.hpp"
+
+camera::camera(point3 position, double aspect_ratio, double focal_length)
+    : position(position), focal_length(focal_length) {
+    auto viewport_height = 2.0;
+    auto viewport_width =  viewport_height * aspect_ratio;
+
+    horizontal = vec3 { viewport_width, 0.0, 0.0 };
+    vertical = vec3 { 0.0, viewport_height, 0.0 };
+
+    bottom_left_pixel = position - horizontal / 2.0 - vertical / 2.0 - vec3 { 0.0, 0.0, focal_length };
+
+    std::cerr << bottom_left_pixel << std::endl;
+}
+
+ray camera::get_ray(double u, double v) const {
+    point3 viewport_pixel = bottom_left_pixel + u * horizontal + v * vertical;
+    return ray {
+        position,
+        viewport_pixel - position
+    };
+}