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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
Clone() Collider
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
}
func (base *BoxCollider) Clone() Collider {
var clone = (&BoxCollider{}).Init (
base.Location.X, base.Location.Y,
base.Location.Width, base.Location.Height)
return clone
}
|
