local drag_system = {}
function drag_system:new(start_position, end_position)
local private = {}
private.dragging = false
private.start_offset = vector(0, 0)
private.end_offset = vector(0, 0)
private.data = {
start_position = start_position,
end_position = end_position,
}
function private.in_bounds(source_vector, start_vector, end_vector)
if (source_vector.x > start_vector.x and source_vector.y > start_vector.y) and (source_vector.x < end_vector.x and source_vector.y < end_vector.y) then
return true
end
return false
end
local public = {}
function public:get_data()
return private.data
end
--This function must be called in render callback
function public:instance()
local mouse_position = ui.get_mouse_position()
if common.is_button_down(0x1) then
if private.in_bounds(mouse_position, private.data.start_position, private.dataend_position) or private.dragging then
if not private.dragging then
private.start_offset = mouse_position - private.data.start_position
private.end_offset = mouse_position - private.data.end_position
private.dragging = true
end
private.data.start_position = mouse_position - private.start_offset
private.data.end_position = mouse_position - private.end_offset
end
elseif private.dragging then
private.dragging = false
end
end
setmetatable(public, self)
self.__index = self
return public
end
