TransformCoord

This function transforms a screen coordinate from one window to another, from a window to the desktop, or from the desktop to a window.

Syntax

iVec2 TransformCoord(number x, number y, Window src, Window dst)
iVec2 TransformCoord(iVec2 coord, Window src, Window dst)

Parameter	Description
x	X component of the coordinate to transform
y	Y component of the coordinate to transform
coord	coordinate to transform
src	source window to transform the coordinate from, or nil for the desktop
dst	destination window to transform the coordinate to, or nil for the desktop

Returns

Returns the transformed coordinate relative to the destination window.

Example

-------------------------------------------------------------------------------------------------
--
-- This example shows two windows with their positions transformed to each other's client area
--
-------------------------------------------------------------------------------------------------

-- Create windows
local displays = GetDisplays()
local window1 = CreateWindow("Window 1", 0, 0, 640, 480, displays[1], WINDOW_TITLEBAR)
local window2 = CreateWindow("Window 2", 200, 200, 640, 480, displays[1], WINDOW_TITLEBAR)

local pos = TransformCoord(window1:GetPosition(), nil, window2)
window1:SetText("Window 1: " .. tostring(pos.x) .. ", " .. tostring(pos.y))
pos = TransformCoord(window2:GetPosition(), nil, window1)
window2:SetText("Window 2: " .. tostring(pos.x) .. ", " .. tostring(pos.y))

while true do
    local ev = WaitEvent()
    if ev.id == EVENT_WINDOWMOVE then
        pos = TransformCoord(window1:GetPosition(), nil, window2)
        window1:SetText("Window 1: " .. tostring(pos.x) .. ", " .. tostring(pos.y))
        pos = TransformCoord(window2:GetPosition(), nil, window1)
        window2:SetText("Window 2: " .. tostring(pos.x) .. ", " .. tostring(pos.y))
    elseif ev.id == EVENT_WINDOWCLOSE then
        return 0
    end
end