Entity Component System framework for Ebitengine
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//go:build example
// +build example
package system
import (
type printInfoSystem struct {
Weapon *component.Weapon
img *ebiten.Image
op *ebiten.DrawImageOptions
func NewPrintInfoSystem() *printInfoSystem {
p := &printInfoSystem{
img: ebiten.NewImage(200, 100),
op: &ebiten.DrawImageOptions{},
p.op.GeoM.Scale(2, 2)
return p
func (s *printInfoSystem) Update(_ gohan.Entity) error {
return gohan.ErrUnregister
func (s *printInfoSystem) Draw(_ gohan.Entity, screen *ebiten.Image) error {
ebitenutil.DebugPrint(s.img, fmt.Sprintf("KEY WASD+MOUSE\nENT %d\nUPD %d\nDRA %d\nTPS %0.0f\nFPS %0.0f", gohan.CurrentEntities(), gohan.CurrentUpdates(), gohan.CurrentDraws(), ebiten.CurrentTPS(), ebiten.CurrentFPS()))
screen.DrawImage(s.img, s.op)
return nil