Add examples catalog with subcommand dispatch

- Extract game engine from package main to engine/ library package
- Create examples/ package with registry, Entry type, and BuilderDeps
- Register default world as an example (moved from main())
- Add combat example: two teams of units facing each other
- Rewrite main.go as thin dispatch: go run . example [name]
- Update README with examples catalog one-liner

1 files changed, 0 insertions, 107 deletions

diff --git a/entity.go b/entity.go
deleted file mode 100644
index 40ca0ea..0000000
--- a/entity.go
+++ /dev/null
@@ -1,107 +0,0 @@
-package main
-
-import (
-	"image/color"
-
-	"age_of_empires/ecs"
-	"age_of_empires/physics"
-	"age_of_empires/selection"
-
-	"github.com/hajimehoshi/ebiten/v2"
-)
-
-type Components struct {
-	Position         physics.Point
-	RelBounds        physics.Rectangle
-	Image            *ebiten.Image
-	Selectable        selection.Selectable
-	Move             physics.Move
-	Order            OrderKind
-	ResourceGatherer ResourceGatherer
-	ResourceSource   ResourceSource
-	ResourceStorage  ResourceStorage
-	Spawn            Spawn
-}
-
-type EntityBuilder struct {
-	mask       ecs.Mask
-	components Components
-}
-
-func NewEntityBuilder() EntityBuilder {
-	return EntityBuilder{
-		components: Components{},
-	}
-}
-
-func (b EntityBuilder) WithPosition(position physics.Point) EntityBuilder {
-	b.components.Position = position
-	b.mask |= ecs.CM_Position
-	return b
-}
-
-func (b EntityBuilder) WithSolid(image *ebiten.Image) EntityBuilder {
-	b.components.Image = image
-	b.mask |= ecs.CM_Image
-	b.components.RelBounds = image.Bounds()
-	b.mask |= ecs.CM_RelBounds
-	return b
-}
-
-var Red = color.RGBA{0xff, 0x00, 0x00, 0xff}
-
-func (b EntityBuilder) WithSelectable(haloKind string, priority selection.Priority) EntityBuilder {
-	b.components.Selectable = selection.Selectable{
-		IsSelected: false,
-		Halo:       nil,
-		Priority:   priority,
-	}
-	b.mask |= ecs.CM_Selectable
-	switch haloKind {
-	case "round":
-		b.components.Selectable.Halo = NewStrokeCircleImage(110, selection.HaloWidth, Red)
-	case "square":
-		b.components.Selectable.Halo = NewStrokeRectangleImage(physics.Point{X: 110, Y: 110}, selection.HaloWidth, Red)
-	}
-	return b
-}
-
-func (b EntityBuilder) WithResourceStorage() EntityBuilder {
-	b.components.ResourceStorage = ResourceStorage{}
-	b.mask |= ecs.CM_ResourceStorage
-	return b
-}
-
-func (b EntityBuilder) WithResourceSource(amount int) EntityBuilder {
-	b.components.ResourceSource = ResourceSource{Remaining: amount}
-	b.mask |= ecs.CM_ResourceSource
-	return b
-}
-
-func (b EntityBuilder) WithSpawn(spawn Spawn) EntityBuilder {
-	b.components.Spawn = spawn
-	b.mask |= ecs.CM_Spawn
-	return b
-}
-
-func (b EntityBuilder) WithMove() EntityBuilder {
-	b.components.Move = physics.Move{IsActive: false}
-	b.mask |= ecs.CM_Move
-	return b
-}
-
-func (b EntityBuilder) WithOrder() EntityBuilder {
-	b.components.Order = OrderKindNone
-	b.mask |= ecs.CM_Order
-	return b
-}
-
-func (b EntityBuilder) WithResourceGatherer(maxCapacity int) EntityBuilder {
-	b.components.ResourceGatherer = ResourceGatherer{MaxCapacity: maxCapacity}
-	b.mask |= ecs.CM_ResourceGatherer
-	return b
-}
-
-func (b EntityBuilder) Build() (Components, ecs.Mask) {
-	return b.components, b.mask
-}