First run at basic structure

internal/game/game.go

@@ -0,0 +1,118 @@
+package game
+
+import (
+	"image/color"
+	"time"
+
+	"github.com/hajimehoshi/ebiten/v2"
+
+	"github.com/atridad/BigFeelings/internal/hero"
+	"github.com/atridad/BigFeelings/internal/status"
+	"github.com/atridad/BigFeelings/internal/ui/hud"
+)
+
+const (
+	ScreenWidth  = 960
+	ScreenHeight = 540
+
+	TargetTPS   = 60
+	WindowTitle = "Big Feelings"
+)
+
+var (
+	backgroundColor = color.NRGBA{R: 0, G: 0, B: 0, A: 255}
+)
+
+type controls struct {
+	Left  bool
+	Right bool
+	Up    bool
+	Down  bool
+}
+
+func readControls() controls {
+	return controls{
+		Left:  ebiten.IsKeyPressed(ebiten.KeyArrowLeft) || ebiten.IsKeyPressed(ebiten.KeyA),
+		Right: ebiten.IsKeyPressed(ebiten.KeyArrowRight) || ebiten.IsKeyPressed(ebiten.KeyD),
+		Up:    ebiten.IsKeyPressed(ebiten.KeyArrowUp) || ebiten.IsKeyPressed(ebiten.KeyW),
+		Down:  ebiten.IsKeyPressed(ebiten.KeyArrowDown) || ebiten.IsKeyPressed(ebiten.KeyS),
+	}
+}
+
+type Game struct {
+	state *state
+}
+
+func New() *Game {
+	return &Game{state: newState()}
+}
+
+func (g *Game) Update() error {
+	g.state.update(readControls())
+	return nil
+}
+
+func (g *Game) Draw(screen *ebiten.Image) {
+	g.state.draw(screen)
+}
+
+func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
+	return ScreenWidth, ScreenHeight
+}
+
+type state struct {
+	hero     *hero.Hero
+	status   *status.Manager
+	hud      hud.Overlay
+	bounds   hero.Bounds
+	lastTick time.Time
+}
+
+func newState() *state {
+	now := time.Now()
+	return &state{
+		hero: hero.New(hero.Config{
+			StartX: ScreenWidth / 2,
+			StartY: ScreenHeight / 2,
+			Radius: 28,
+			Speed:  180,
+			Color:  color.NRGBA{R: 210, G: 220, B: 255, A: 255},
+		}),
+		status: status.NewManager([]status.Config{
+			{Label: "Core", Base: 60, Color: color.NRGBA{R: 255, G: 208, B: 0, A: 255}},
+			{Label: "Drive", Base: 45, Color: color.NRGBA{R: 0, G: 190, B: 255, A: 255}},
+			{Label: "Flux", Base: 30, Color: color.NRGBA{R: 255, G: 92, B: 120, A: 255}},
+		}),
+		hud: hud.Overlay{
+			X:     ScreenWidth - 220,
+			Y:     20,
+			Color: color.White,
+		},
+		bounds: hero.Bounds{
+			Width:  ScreenWidth,
+			Height: ScreenHeight,
+		},
+		lastTick: now,
+	}
+}
+
+func (s *state) update(input controls) {
+	now := time.Now()
+	dt := now.Sub(s.lastTick).Seconds()
+	s.lastTick = now
+
+	s.hero.Update(hero.Input{
+		Left:  input.Left,
+		Right: input.Right,
+		Up:    input.Up,
+		Down:  input.Down,
+	}, dt, s.bounds)
+
+	s.status.Update()
+}
+
+func (s *state) draw(screen *ebiten.Image) {
+	screen.Fill(backgroundColor)
+	s.hero.Draw(screen)
+	s.hud.Draw(screen, s.status.Meters())
+}