StylusInputDisplay.lua

-- Gives a cross hair UI for the stylus for DS games

local upColor = 'white'
local downColor = 'green'
local dotColor = 'red'

function Draw(x, y, maxX, maxY, isDown)
    color = upColor
    if isDown then
        color = downColor
    end

    gui.drawLine(0, y, maxX, y, color)
    gui.drawLine(x, 0, x, maxY, color)

    if isDown then
        gui.drawPixel(x, y, dotColor)
    end
end

while true do
    if emu.getsystemid() ~= "NDS" then
        console.log('This script is for Nintendo DS only')
        break
    end

    local btns = joypad.get()

    if movie.mode() == "PLAY" and emu.framecount() > 0 then
        btns = movie.getinput(emu.framecount() - 1)
    end

    local x = btns['TouchX']
    local y = btns['TouchY']
    local isDown = btns['Touch']

    -- A bit of a hack to ensure it is not drawing while mouse moving
    -- on the top screen
    if y == 0 then
        x = 0
    end

    pts = client.transformPoint(x, y)
    local tx = pts["x"];
    local ty = pts["y"];
gui.DrawNew("native")
    Draw(tx, ty, 10000, 10000, isDown)

    emu.frameadvance()
end