Checkpoint

1 files changed, 33 insertions, 0 deletions

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)
+}
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