Learn DEFOLD with Real Code Examples

-- player.script
function init(self)
    self.speed = 200
end

function update(self, dt)
    local move = vmath.vector3()
    if go.get_action("left").pressed then
        move.x = move.x - 1
    end
    if go.get_action("right").pressed then
        move.x = move.x + 1
    end
    go.set_position(go.get_position() + move * self.speed * dt)
end

A basic Defold script in Lua to move a player left and right using arrow keys.

-- player_jump.script
function init(self)
    self.speed = 200
    self.vspeed = 0
    self.gravity = 500
end

function update(self, dt)
    local move = vmath.vector3()
    if go.get_action("left").pressed then move.x = move.x - 1 end
    if go.get_action("right").pressed then move.x = move.x + 1 end
    if go.get_action("jump").pressed and self.vspeed == 0 then self.vspeed = -300 end

    self.vspeed = self.vspeed + self.gravity * dt
    move.y = self.vspeed * dt
    go.set_position(go.get_position() + move * self.speed * dt)
end

Adds jumping to the player with simple gravity.

-- player_shoot.script
function init(self)
    self.speed = 200
end

function update(self, dt)
    if go.get_action("shoot").pressed then
        factory.create("#bullet_factory", go.get_position())
    end
end

Player shoots a bullet when pressing space.

-- enemy.script
function update(self, dt)
    local player_pos = go.get_position("/player")
    local pos = go.get_position()
    local dir = vmath.normalize(player_pos - pos)
    go.set_position(pos + dir * 100 * dt)
end

Enemy moves towards the player.

-- timer.script
function init(self)
    self.timer = 0
end

function update(self, dt)
    self.timer = self.timer + dt
    if self.timer >= 1 then
        print("Timer triggered")
        self.timer = 0
    end
end

Runs a repeating timer action.

-- mouse.script
function update(self, dt)
    if mouse.is_button_pressed(mouse.BUTTON_LEFT) then
        print("Left click")
    end
    if mouse.is_button_pressed(mouse.BUTTON_RIGHT) then
        print("Right click")
    end
end

Detects mouse clicks in the game window.

-- fps.script
function update(self, dt)
    local fps = 1 / dt
    print(string.format("FPS: %.2f", fps))
end

Prints FPS each frame.

-- random_move.script
function update(self, dt)
    local pos = go.get_position()
    pos.x = pos.x + math.random(-1,1) * 50 * dt
    pos.y = pos.y + math.random(-1,1) * 50 * dt
    go.set_position(pos)
end

Moves an object randomly each frame.

-- animation.script
function update(self, dt)
    self.time = (self.time or 0) + dt
    if self.time >= 0.1 then
        sprite.play_flipbook(go.get_id(), hash("anim"))
        self.time = 0
    end
end

Cycles sprite animation frames automatically.

-- collision.script
function on_message(self, message_id, message, sender)
    if message_id == hash("contact_point_response") then
        print("Collision detected with", sender)
    end
end

Checks collision with another game object.