1 files changed, 40 insertions, 0 deletions
diff --git a/src/pattern.rs b/src/pattern.rs
new file mode 100644
index 0000000..ba9899e
--- /dev/null
+++ b/src/pattern.rs
@@ -0,0 +1,40 @@
+use crate::{color::Color, Sample};
+
+pub struct Rainbow;
+impl Sample for Rainbow {
+    fn sample(&mut self, x: f64, _y: f64) -> Color {
+        static PI: f64 = 3.14;
+        let x = x * PI * 2.0;
+        return Color {
+            r: (x + PI / 3.0 * 0.0).sin() * 0.5 + 0.5,
+            g: (x + PI / 3.0 * 2.0).sin() * 0.5 + 0.5,
+            b: (x + PI / 3.0 * 4.0).sin() * 0.5 + 0.5,
+        };
+    }
+}
+
+pub struct Sequence(pub Vec<Color>);
+impl Sample for Sequence {
+    fn sample(&mut self, x: f64, _y: f64) -> Color {
+        self.0[(x * self.0.len() as f64).floor() as usize % self.0.len()]
+    }
+}
+
+pub struct Gradient(pub Vec<Color>);
+impl Sample for Gradient {
+    fn sample(&mut self, x: f64, _y: f64) -> Color {
+        let index = x * self.0.len() as f64;
+        let index_int = index.floor() as usize;
+        let index_error = index % 1.0;
+        let a = self.0[index_int % self.0.len()];
+        let b = self.0[(index_int + 1) % self.0.len()];
+        Color::mix(a, b, index_error)
+    }
+}
+
+pub struct Solid(pub Color);
+impl Sample for Solid {
+    fn sample(&mut self, _x: f64, _y: f64) -> Color {
+        self.0
+    }
+}