gohan/examples/twinstick/system/printinfo.go

//go:build example
// +build example

package system

import (
	"fmt"

	"code.rocketnine.space/tslocum/gohan"
	"code.rocketnine.space/tslocum/gohan/examples/twinstick/component"
	"code.rocketnine.space/tslocum/gohan/examples/twinstick/world"
	"github.com/hajimehoshi/ebiten/v2"
	"github.com/hajimehoshi/ebiten/v2/ebitenutil"
)

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{
		component.WeaponComponentID,
	}
}

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

	s.img.Clear()
	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
}