Name change

internal/world/surface.go

@@ -0,0 +1,121 @@
+package world
+
+import (
+	"image/color"
+
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/vector"
+)
+
+type SurfaceTag int
+
+const (
+	TagGround SurfaceTag = iota
+	TagWall
+	TagPlatform
+	TagHazard
+)
+
+type Surface struct {
+	X      float64
+	Y      float64
+	Width  float64
+	Height float64
+	Tag    SurfaceTag
+	Color  color.NRGBA
+}
+
+func (s *Surface) Bounds() (x, y, width, height float64) {
+	return s.X, s.Y, s.Width, s.Height
+}
+
+func (s *Surface) Contains(x, y float64) bool {
+	return x >= s.X && x <= s.X+s.Width && y >= s.Y && y <= s.Y+s.Height
+}
+
+func (s *Surface) IsSolid() bool {
+	switch s.Tag {
+	case TagGround, TagWall, TagPlatform:
+		return true
+	case TagHazard:
+		return false
+	default:
+		return false
+	}
+}
+
+func (s *Surface) IsWalkable() bool {
+	switch s.Tag {
+	case TagGround, TagPlatform:
+		return true
+	case TagWall, TagHazard:
+		return false
+	default:
+		return false
+	}
+}
+
+func (s *Surface) Draw(screen *ebiten.Image) {
+	vector.DrawFilledRect(
+		screen,
+		float32(s.X),
+		float32(s.Y),
+		float32(s.Width),
+		float32(s.Height),
+		s.Color,
+		false,
+	)
+}
+
+type World struct {
+	Surfaces []*Surface
+}
+
+func NewWorld() *World {
+	return &World{
+		Surfaces: make([]*Surface, 0),
+	}
+}
+
+func (w *World) AddSurface(surface *Surface) {
+	w.Surfaces = append(w.Surfaces, surface)
+}
+
+func (w *World) GetSurfacesWithTag(tag SurfaceTag) []*Surface {
+	var result []*Surface
+	for _, s := range w.Surfaces {
+		if s.Tag == tag {
+			result = append(result, s)
+		}
+	}
+	return result
+}
+
+func (w *World) GetSurfacesAt(x, y float64) []*Surface {
+	var result []*Surface
+	for _, s := range w.Surfaces {
+		if s.Contains(x, y) {
+			result = append(result, s)
+		}
+	}
+	return result
+}
+
+func (w *World) CheckCollision(x, y, width, height float64) *Surface {
+	for _, s := range w.Surfaces {
+		if !s.IsSolid() {
+			continue
+		}
+		if x+width > s.X && x < s.X+s.Width &&
+			y+height > s.Y && y < s.Y+s.Height {
+			return s
+		}
+	}
+	return nil
+}
+
+func (w *World) Draw(screen *ebiten.Image) {
+	for _, s := range w.Surfaces {
+		s.Draw(screen)
+	}
+}