movement_speed.script
go.property("acceleration", 100) go.property("deceleration", 200) go.property("max_speed", 400) function init(self) -- make sure the script will receive user input msg.post(".", "acquire_input_focus") -- movement input self.input = vmath.vector3() -- the current direction of movement self.direction = vmath.vector3() -- the current speed (pixels/second) self.speed = 0 end function update(self, dt) -- is any key pressed? if self.input.x ~= 0 or self.input.y ~= 0 then -- set direction of travel from input self.direction = self.input -- increase speed self.speed = self.speed + self.acceleration * dt -- cap speed self.speed = math.min(self.speed, self.max_speed) else -- decrease speed when no key is pressed self.speed = self.speed - self.deceleration * dt self.speed = math.max(self.speed, 0) end -- move the game object local p = go.get_position() p = p + self.direction * self.speed * dt go.set_position(p) -- reset input self.input = vmath.vector3() end function on_input(self, action_id, action) -- update direction of movement based on currently pressed keys if action_id == hash("up") then self.input.y = 1 elseif action_id == hash("down") then self.input.y = -1 elseif action_id == hash("left") then self.input.x = -1 elseif action_id == hash("right") then self.input.x = 1 end end
If you want to play with these examples, you can get the project on Github.
Do you want to see more examples? Why not write a few yourself and submit a pull request? We love contributions.
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