aego/modules/gameplay/res/docs/try/Health.aes

package demo

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

// Player walks with A/D, jumps with Space and strikes with J.
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()
        }
    }
}

// Sword strikes once per J press with its Hitbox 2D.
script Sword {
    func Update(dt float) {
        if input.KeyPressed(input.KeyJ) {
            node.Get<Hitbox2D>().Pulse()
        }
        p := node.WorldPosition()
        debug.Rect(Rect{p.X - 0.3, p.Y - 0.2, 0.6, 0.4}, Color{1, 1, 1, 0.5})
        debug.Text(Vec2{p.X - 1.6, p.Y - 1.6}, "J: strike", Color{0.8, 0.8, 0.8, 1})
    }
}

// Dummy shows its hit points, the last damage, and comes back a second after it dies.
script Dummy {
    var wait float
    var flash float
    var shown int
    var died Connection
    var hurt Connection

    func Ready() {
        hp := node.Get<Health>()
        died = hp.Died.Connect(OnDied)
        hurt = hp.Damaged.Connect(OnDamaged)
    }

    func OnDied(source NodeRef) {
        wait = 1
    }

    func OnDamaged(amount int, source NodeRef) {
        shown = amount
        flash = 1
    }

    func Update(dt float) {
        hp := node.Get<Health>()
        if wait > 0 {
            wait -= dt
            if wait <= 0 {
                hp.Revive(0)
            }
        }
        p := node.WorldPosition()
        debug.Rect(Rect{p.X - 0.6, p.Y - 1.3, 1.2, 0.15}, Color{0.3, 0.3, 0.3, 1})
        debug.Rect(Rect{p.X - 0.6, p.Y - 1.3, 1.2 * float(hp.Current) / float(hp.Max), 0.15}, Color{0.2, 0.85, 0.3, 1})
        if flash > 0 {
            flash -= dt
            debug.Text(Vec2{p.X + 0.6, p.Y - 1.6 - (1 - flash) * 0.5}, "-" + string(shown), Color{1, 0.45, 0.3, 1})
        }
    }
}