1 files changed, 85 insertions, 0 deletions
diff --git a/engine/CoreObjects/Collider.go b/engine/CoreObjects/Collider.go
new file mode 100644
index 0000000..93cbee6
--- /dev/null
+++ b/engine/CoreObjects/Collider.go
@@ -0,0 +1,85 @@
+package coreobjects
+
+import (
+	"image/color"
+
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+var ColliderColour color.RGBA = color.RGBA{ 154, 20, 184, 255 / 2 }
+
+type Collider interface {
+	Init(x float32, y float32, height float32, width float32) Collider
+	MoveIfPossible(colliders []*Collider, dx float32, dy float32)
+	Move(dx float32, dy float32)
+	MoveTo(x float32, y float32)
+	Intersects(x float32, y float32) bool
+	CanMove(colliders []*Collider, dx float32, dy float32) bool
+
+	Draw()
+}
+
+type BoxCollider struct {
+	Location rl.Rectangle
+}
+
+func (base *BoxCollider) Init(x float32, y float32, height float32, width float32) Collider { 
+	base.Location = rl.Rectangle{
+		X: x,
+		Y: y,
+		Width: width,
+		Height: height,
+	}
+	return base
+}
+
+func (base *BoxCollider) Intersects(x float32, y float32) bool {
+	if base.Location.X < x || base.Location.Y < y { 
+		return false
+	}
+	if base.Location.X + base.Location.Width > x || base.Location.Y + base.Location.Height > y {
+		return false
+	}
+	return true
+}
+
+func (base *BoxCollider) Move(dx float32, dy float32) {
+	base.Location.X += dx
+	base.Location.Y += dy
+}
+
+func (base *BoxCollider) MoveTo(x float32, y float32) {
+	base.Location.X = x
+	base.Location.Y = y
+}
+
+func (base *BoxCollider) MoveIfPossible(colliders []*Collider, dx float32, dy float32) {
+	if base.CanMove(colliders, dx, dy) {
+		base.Move(dx, dy)
+	}
+}
+
+func (base *BoxCollider) Draw() {
+	rl.DrawRectangle(base.Location.ToInt32().X, 
+		base.Location.ToInt32().Y,
+		base.Location.ToInt32().Width, 
+		base.Location.ToInt32().Height,
+		ColliderColour)
+}
+
+func (base *BoxCollider) CanMove(colliders []*Collider, dx float32, dy float32) bool {
+	var x = base.Location.X + dx
+	var y = base.Location.Y + dy
+	var width = base.Location.Width
+	var height = base.Location.Height
+	// TODO: optimise
+	for _, v := range colliders {
+		if  (*v).Intersects(x, y) ||
+			(*v).Intersects(x + width, y) ||
+			(*v).Intersects(x, y + height) ||
+			(*v).Intersects(x + width, y + height) {
+				return false
+			}
+	}
+	return true
+}