aego/modules/gameplay/res/docs/StateMachineGuideOriginal.aes

package demo

import (
    "aego/debug"
    "aego/input"
)

// Player keeps its states in a State Machine: Idle, Run and Air, each with its own hooks and colour.
script Player {
    func Update(dt float) {
        m := node.Get<Motion2D>()
        x := 0.0
        if input.Down(input.KeyA) || input.Down(input.KeyLeft) {
            x -= 1
        }
        if input.Down(input.KeyD) || input.Down(input.KeyRight) {
            x += 1
        }
        m.Move(x)
        if input.KeyPressed(input.KeySpace) || input.KeyPressed(input.KeyW) || input.KeyPressed(input.KeyUp) {
            m.Jump()
        }
        if input.KeyReleased(input.KeySpace) || input.KeyReleased(input.KeyW) || input.KeyReleased(input.KeyUp) {
            m.JumpReleased()
        }
        sm := node.Get<StateMachine>()
        p := node.WorldPosition()
        debug.Text(Vec2{p.X - 0.4, p.Y - 1}, sm.Current, Color{1, 1, 1, 1})
    }

    func UpdateIdle(dt float) {
        m := node.Get<Motion2D>()
        if !m.Grounded {
            node.Get<StateMachine>().Go("Air")
        } else if m.Velocity.X > 0.5 || m.Velocity.X < -0.5 {
            node.Get<StateMachine>().Go("Run")
        }
    }

    func UpdateRun(dt float) {
        m := node.Get<Motion2D>()
        if !m.Grounded {
            node.Get<StateMachine>().Go("Air")
        } else if m.Velocity.X < 0.5 && m.Velocity.X > -0.5 {
            node.Get<StateMachine>().Go("Idle")
        }
    }

    func UpdateAir(dt float) {
        if node.Get<Motion2D>().Grounded {
            node.Get<StateMachine>().Go("Idle")
        }
    }

    func EnterIdle() {
        node.Get<SpriteRenderer>().Tint = Color{0.96, 0.62, 0.04, 1}
    }

    func EnterRun() {
        node.Get<SpriteRenderer>().Tint = Color{0.2, 0.8, 0.4, 1}
    }

    func EnterAir() {
        node.Get<SpriteRenderer>().Tint = Color{0.3, 0.6, 1, 1}
    }
}