This example shows how to rotate a game object to look at the mouse cursor. It reads the mouse position in
on_input and uses the mathematical function
math.atan2(x, y) to calculate the angle between the ray to the point to look at and the positive x-axis. This angle is used to set the rotation of the game object to always look at the mouse position.
function init(self) -- make sure the script will receive user input msg.post(".", "acquire_input_focus") end local function look_at(target_position) -- own positon local my_position = go.get_position() -- calculate the angle that this object has to rotate to look at the given point local angle = math.atan2(my_position.x - target_position.x, target_position.y - my_position.y) -- set rotation as a quaternion go.set_rotation(vmath.quat_rotation_z(angle)) end function on_input(self, action_id, action) -- mouse/finger movement has action_id set to nil if not action_id then -- the position to look at (mouse/finger) local target_position = vmath.vector3(action.x, action.y, 0) -- rotate this object to look at the target position look_at(target_position) end end
If you want to play with these examples, you can get the project on Github.
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