gohan/examples/twinstick/system/input_move.go

//go:build example
// +build example

package system

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

type movementInputSystem struct {
	Velocity *component.Velocity
	Weapon   *component.Weapon
}

func NewMovementInputSystem() *movementInputSystem {
	return &movementInputSystem{}
}

func (s *movementInputSystem) Update(entity gohan.Entity) error {
	if ebiten.IsKeyPressed(ebiten.KeyA) {
		s.Velocity.X -= 0.5
		if s.Velocity.X < -5 {
			s.Velocity.X = -5
		}
	}
	if ebiten.IsKeyPressed(ebiten.KeyD) {
		s.Velocity.X += 0.5
		if s.Velocity.X > 5 {
			s.Velocity.X = 5
		}
	}
	if ebiten.IsKeyPressed(ebiten.KeyW) {
		s.Velocity.Y -= 0.5
		if s.Velocity.Y < -5 {
			s.Velocity.Y = -5
		}
	}
	if ebiten.IsKeyPressed(ebiten.KeyS) {
		s.Velocity.Y += 0.5
		if s.Velocity.Y > 5 {
			s.Velocity.Y = 5
		}
	}
	return nil
}

func (s *movementInputSystem) Draw(_ gohan.Entity, _ *ebiten.Image) error {
	return gohan.ErrUnregister
}