Unfinished film

1 files changed, 86 insertions, 0 deletions

diff --git a/src/bound.rs b/src/bound.rs
new file mode 100644
index 0000000..b7ce05d
--- /dev/null
+++ b/src/bound.rs
@@ -0,0 +1,86 @@
+use crate::{Number, Float};
+use crate::vector::*;
+
+pub struct Bound2<T: Number> {
+    pub min: Vector2<T>,
+    pub max: Vector2<T>
+}
+
+pub type Bound2i = Bound2<i32>;
+pub type Bound2f = Bound2<Float>;
+
+fn min<T: Number> (a: T, b: T) -> T {
+    if b < a {
+        return b;
+    }
+    a
+}
+
+fn max<T: Number> (a: T, b: T) -> T {
+    if b > a {
+        return b;
+    }
+    a
+}
+
+impl<T: Number> Bound2<T> {
+    fn new(p0: &Vector2<T>, p1: &Vector2<T>) -> Bound2<T> {
+        let min = Vector2::from_xy(min(p0.x, p1.x), min(p0.y, p1.y));
+        let max = Vector2::from_xy(max(p0.x, p1.x), max(p0.y, p1.y));
+
+        Bound2 { min, max }
+    }
+
+    fn diagonal(&self) -> Vector2<T> {
+        self.max - self.min
+    }
+
+    fn area(&self) -> T {
+        let diag = self.diagonal();
+        return diag.x * diag.y;
+    }
+}
+
+impl From<&Bound2i> for Bound2f {
+    fn from(b: &Bound2i) -> Self {
+        Self {
+            min: Vector2f::from(b.min),
+            max: Vector2f::from(b.max),
+        }
+    }
+}
+
+impl From<&Bound2f> for Bound2i {
+    fn from(b: &Bound2f) -> Self {
+        Self {
+            min: Vector2i::from(b.min),
+            max: Vector2i::from(b.max),
+        }
+    }
+}
+
+pub fn intersect<T: Number>(a: &Bound2<T>, b: &Bound2<T>) -> Bound2<T> {
+    Bound2::new(
+        &Vector2::from_xy(max(a.min.x, b.min.x), max(a.min.y, b.min.y)),
+        &Vector2::from_xy(min(a.max.x, b.max.x), min(a.max.y, b.max.y)),
+        )
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn create_test() -> Bound2<i32> {
+        Bound2::new(
+            &Vector2::from_xy(1, 2),
+            &Vector2::from_xy(10, 3)
+            )
+    }
+
+    #[test]
+    fn area() {
+        let b = create_test();
+
+        assert!(b.area() == 9);
+    }
+}