Entity Component System framework for Ebiten
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//go:build example
// +build example
package system
import (
type printInfoSystem struct {
img *ebiten.Image
op *ebiten.DrawImageOptions
player gohan.Entity
func NewPrintInfoSystem(player gohan.Entity) *printInfoSystem {
p := &printInfoSystem{
img: ebiten.NewImage(200, 100),
op: &ebiten.DrawImageOptions{},
player: player,
p.op.GeoM.Scale(2, 2)
return p
func (s *printInfoSystem) Components() []gohan.ComponentID {
return []gohan.ComponentID{
func (s *printInfoSystem) Update(ctx *gohan.Context) error {
return gohan.ErrSystemWithoutUpdate
func (s *printInfoSystem) Draw(ctx *gohan.Context, screen *ebiten.Image) error {
w := world.World
ebitenutil.DebugPrint(s.img, fmt.Sprintf("KEY WASD+MOUSE\nENT %d\nUPD %d\nDRA %d\nTPS %0.0f\nFPS %0.0f", w.ActiveEntities(), w.UpdatedEntities(), w.DrawnEntities(), ebiten.CurrentTPS(), ebiten.CurrentFPS()))
screen.DrawImage(s.img, s.op)
return nil