brownboxbatman/system/camera.go

46 lines
972 B
Go

package system
import (
"code.rocketnine.space/tslocum/brownboxbatman/component"
"code.rocketnine.space/tslocum/brownboxbatman/world"
"code.rocketnine.space/tslocum/gohan"
"github.com/hajimehoshi/ebiten/v2"
)
const CameraMoveSpeed = 0.132
type CameraSystem struct {
}
func NewCameraSystem() *CameraSystem {
s := &CameraSystem{}
return s
}
func (_ *CameraSystem) Needs() []gohan.ComponentID {
return []gohan.ComponentID{
component.WeaponComponentID,
component.PositionComponentID,
}
}
func (_ *CameraSystem) Uses() []gohan.ComponentID {
return nil
}
func (s *CameraSystem) Update(ctx *gohan.Context) error {
if world.World.MessageVisible || !world.World.GameStarted || world.World.GameOver {
return nil
}
world.World.CamMoving = world.World.CamY > 0
if world.World.CamMoving {
world.World.CamY -= CameraMoveSpeed
}
return nil
}
func (_ *CameraSystem) Draw(_ *gohan.Context, screen *ebiten.Image) error {
return gohan.ErrSystemWithoutDraw
}