SO Coords v1

local picking, testMarker, zDifference
local markerInfo = {}

function pickPosition()
    if (not picking or not isCursorShowing()) then
        return false
    end
    local dumpx, dumpy, worldX, worldY, worldZ = getCursorPosition()
    local px, py, pz = getCameraMatrix()
    local hit, x, y, z, elementHit = processLineOfSight(px, py, pz, worldX, worldY, worldZ)
    if (not hit) then
        return false
    end
    z = z + zDifference
    setElementPosition(testMarker, x, y, z)
    local text = "X: " .. x .. ", Y: " .. y .. ", Z: " .. z
    dxDrawText(text, 0, 0, 0, 0) -- debugging only
    markerInfo = {}
    markerInfo = {x, y, z}
end

function increaseZ()
    if (not picking) then
        return false
    end
    zDifference = zDifference + 0.1
end

function decreaseZ()
    if (not picking) then
        return false
    end
    zDifference = zDifference - 0.1
end

function spawnMarker()
    if (not picking or not isCursorShowing()) then
        return false
    end
    local x, y, z = markerInfo[1], markerInfo[2], markerInfo[3]
    local zone, city = getZoneName(x, y, z), getZoneName(x, y, z, true)
    outputChatBox(x .. " " .. x .. " " .. z)
    outputChatBox(zone .. ", " .. city)
    toggleListening()
end

function toggleListening()
    picking = not picking
    showCursor(picking)
    if (picking) then
        testMarker = createMarker(0, 0, 0, "cylinder", 2, 255, 167, 0)
        removeEventHandler("onClientRender", root, pickPosition)
        addEventHandler("onClientRender", root, pickPosition)
        picking = true
        zDifference = 0
        bindKey("mouse1", "down", spawnMarker)
        bindKey("pgup", "down", increaseZ)
        bindKey("pgdn", "down", decreaseZ)
        bindKey("num_8", "down", increaseZ)
        bindKey("num_2", "down", decreaseZ)
        return false
    end
    markerInfo = {}
    destroyElement(testMarker)
    testMarker = nil
    unbindKey("pgup", "down", increaseZ)
    unbindKey("pgdn", "down", decreaseZ)
    unbindKey("num_8", "down", increaseZ)
    unbindKey("num_2", "down", decreaseZ)
    unbindKey("mouse1", "down", spawnMarker)
end
addCommandHandler("tc", toggleListening)