From 395aa7d1c312e495517701be11c21425d9a5838e Mon Sep 17 00:00:00 2001
From: Elizabeth Hunt <me@liz.coffee>
Date: Sun, 26 Oct 2025 17:25:13 -0700
Subject: Checkpoint

---
 .../src/commonMain/kotlin/coffee/liz/ecs/Vec.kt    | 33 ++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 composeApp/src/commonMain/kotlin/coffee/liz/ecs/Vec.kt

(limited to 'composeApp/src/commonMain/kotlin/coffee/liz/ecs/Vec.kt')

diff --git a/composeApp/src/commonMain/kotlin/coffee/liz/ecs/Vec.kt b/composeApp/src/commonMain/kotlin/coffee/liz/ecs/Vec.kt
new file mode 100644
index 0000000..0b771e4
--- /dev/null
+++ b/composeApp/src/commonMain/kotlin/coffee/liz/ecs/Vec.kt
@@ -0,0 +1,33 @@
+package coffee.liz.ecs
+
+/**
+ * Rectangle in cartesian space.
+ */
+data class Rect(
+    val topLeft: Vec2,
+    val dimensions: Vec2
+) {
+    fun overlaps(other: Rect): Boolean {
+        val xOverlap = topLeft.x <= other.topLeft.x + other.dimensions.x &&
+                topLeft.x + dimensions.x >= other.topLeft.x
+        val yOverlap = topLeft.y <= other.topLeft.y + other.dimensions.y &&
+                topLeft.y + dimensions.y >= other.topLeft.y
+        return xOverlap && yOverlap
+    }
+}
+
+/**
+ * Cartesian point.
+ */
+data class Vec2(
+    val x: Float,
+    val y: Float
+) {
+    fun plus(other: Vec2): Vec2 = Vec2(x + other.x, y + other.y)
+    fun minus(other: Vec2): Vec2 = Vec2(x - other.x, y - other.y)
+    fun times(scalar: Float): Vec2 = Vec2(x * scalar, y * scalar)
+    fun div(scalar: Float): Vec2 = Vec2(x / scalar, y / scalar)
+    fun distanceTo(other: Vec2): Float = (this.minus(other)).length()
+    fun normalize(): Vec2 = this.div(length())
+    fun length(): Float = kotlin.math.sqrt(x * x + y * y)
+}
\ No newline at end of file
-- 
cgit v1.2.3-70-g09d2