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package main
import (
"image/color"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/inpututil"
"github.com/hajimehoshi/ebiten/v2/vector"
)
type Action string
const (
Selecting Action = "selecting"
PlacingWall Action = "placing-wall"
)
type Tile struct {
*ebiten.Image
Size Point
Position Point
}
func NewTile(size Point, position Point, color color.Color) Tile {
image := ebiten.NewImage(int(size.X), int(size.Y))
image.Fill(color)
return Tile{Size: size, Position: position, Image: image}
}
func (t Tile) CollisionBounds() Rectangle {
return Rectangle{t.Position, t.Position.Add(t.Size)}
}
var soilColor = color.RGBA{0x60, 0x40, 0x20, 0xff}
var soil = NewTile(Point{2800, 2000}, Point{200, 200}, soilColor)
var wallButton = NewTile(Point{100, 100}, Point{50, 50}, color.RGBA{0x00, 0x00, 0x00, 0xff})
type Selection struct {
IsActive bool
Start Point
}
type Game struct {
Persons []*Person
CurrentAction Action
Selection Selection
Walls []Tile
}
func (g *Game) updateSelecting(cursor Point) {
if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) {
g.Selection.Start = cursor
g.Selection.IsActive = true
}
if inpututil.IsMouseButtonJustReleased(ebiten.MouseButtonRight) {
destination := cursor.Sub(soil.Position).Div(100).Mul(100).Add(Point{50, 50})
blocked := map[Point]bool{}
for _, w := range g.Walls {
blocked[w.Position] = true
}
for _, p := range g.Persons {
if p.IsSelected {
futureBounds := Rectangle{
destination.Sub(p.size.Div(2)),
destination.Add(p.size.Div(2)),
}
if futureBounds.In(soil.Bounds()) {
p.MoveTo(destination, blocked)
}
}
}
}
if inpututil.IsMouseButtonJustReleased(ebiten.MouseButtonLeft) {
if g.Selection.IsActive && Distance(g.Selection.Start, cursor) > 10 {
for _, p := range g.Persons {
p.IsSelected = false
selectionBounds := Rectangle{g.Selection.Start.Sub(soil.Position), cursor.Sub(soil.Position)}.Canon()
if selectionBounds.Overlaps(p.CollisionBounds()) {
p.IsSelected = true
}
}
} else {
canBeSelected := true
for _, p := range g.Persons {
p.IsSelected = false
if cursor.Sub(soil.Position).In(p.CollisionBounds()) {
p.IsSelected = canBeSelected
canBeSelected = false
}
}
}
g.Selection.IsActive = false
}
}
func (g *Game) updatePlacingWall(cursor Point) {
if inpututil.IsMouseButtonJustReleased(ebiten.MouseButtonLeft) {
if cursor.In(soil.Bounds()) {
position := cursor.Sub(soil.Position).Div(100).Mul(100).Add(Point{50, 50})
g.Walls = append(g.Walls, NewTile(Point{100, 100}, position, color.RGBA{0x00, 0x00, 0x00, 0xff}))
}
}
}
func (g *Game) Update() error {
x, y := ebiten.CursorPosition()
cursor := Point{x, y}
if inpututil.IsMouseButtonJustReleased(ebiten.MouseButtonLeft) && cursor.In(wallButton.CollisionBounds()) {
if g.CurrentAction == PlacingWall {
g.CurrentAction = Selecting
} else {
g.CurrentAction = PlacingWall
}
}
if inpututil.IsKeyJustReleased(ebiten.KeyEscape) {
g.CurrentAction = Selecting
}
switch g.CurrentAction {
case Selecting:
g.updateSelecting(cursor)
case PlacingWall:
if g.Selection.IsActive {
g.Selection.IsActive = false
}
g.updatePlacingWall(cursor)
}
for _, p := range g.Persons {
p.Update()
}
return nil
}
func (g *Game) Draw(screen *ebiten.Image) {
screen.Fill(color.RGBA{0x80, 0xa0, 0xc0, 0xff})
soil.Fill(soilColor)
for _, w := range g.Walls {
bounds := w.Image.Bounds()
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(w.Position.X-bounds.Dx()/2), float64(w.Position.Y-bounds.Dy()/2))
soil.DrawImage(w.Image, op)
}
for _, p := range g.Persons {
bounds := p.Image().Bounds()
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(p.Position.X-bounds.Dx()/2), float64(p.Position.Y-bounds.Dy()/2))
soil.DrawImage(p.Image(), op)
if p.IsSelected && p.move.IsActive {
last := p.Position
for _, point := range p.move.Path {
vector.StrokeLine(soil.Image, float32(last.X), float32(last.Y), float32(point.X), float32(point.Y), 10.0, color.RGBA{256 * 3 / 16, 256 * 3 / 16, 256 * 3 / 16, 256 / 4}, true)
last = point
}
}
}
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(soil.Position.X), float64(soil.Position.Y))
screen.DrawImage(soil.Image, op)
op = &ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(wallButton.Position.X), float64(wallButton.Position.Y))
screen.DrawImage(wallButton.Image, op)
if g.Selection.IsActive {
x, y := ebiten.CursorPosition()
screenClick := Point{x, y}
vector.StrokeRect(screen, float32(g.Selection.Start.X), float32(g.Selection.Start.Y), float32(screenClick.X-g.Selection.Start.X), float32(screenClick.Y-g.Selection.Start.Y), 10.0, color.RGBA{256 * 3 / 16, 256 * 3 / 16, 256 * 3 / 16, 256 / 4}, true)
}
}
func (g *Game) Layout(outsideWidth, outsideHeight int) (screenWidth, screenHeight int) {
return 3200, 2400
}
func main() {
ebiten.SetWindowSize(640, 480)
ebiten.SetWindowTitle("Age of Empire")
game := &Game{}
mainPerson := NewPerson(Point{soil.Image.Bounds().Dx() / 2, soil.Image.Bounds().Dy() / 2})
nonPlayerPerson := NewPerson(Point{400, 400})
game.Persons = append(game.Persons, &mainPerson)
game.Persons = append(game.Persons, &nonPlayerPerson)
game.CurrentAction = Selecting
for i := 0; i < 10; i++ {
game.Walls = append(game.Walls, NewTile(Point{100, 100}, Point{350 + i*100, 350}, color.RGBA{0x00, 0x00, 0x00, 0xff}))
}
if err := ebiten.RunGame(game); err != nil {
panic(err)
}
}
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