GBA Crash 1 speed hud.lua

--speed hud values v1.1.2 by ThunderAxe31 for GBA Crash Bandicoot - The Huge Adventure

x_max = 1224
x_middle = 496
y_max = 1536
y_middle = 0

player_x_addr = 0x010A14
player_y_addr = 0x010A18
framecount = 0
player_x = 0
player_x_old = 0
speed_x = 0
player_y = 0
player_y_old = 0
speed_y = 0
x = {}
y = {}

function round(x)
  if x%2 ~= 0.5 then
    return math.floor(x+0.5)
  end
  return x-0.5
end

function decide_color(speed, middle, maxi)
    if speed == nil then
        return
    end

    speed = math.abs(speed)
    maxi = math.abs(maxi)

    if speed > maxi then
        color = 0x000000FF
    elseif speed < middle then --if 0: red; if middle: white
        local value = math.floor(0xFF*(speed/middle))
        color = 0xFF0000 + value*0x101
    else --if middle: white; if maxi: green
        local value = math.floor(0xFF*(1-(speed-middle)/(maxi-middle)))
        color = 0x00FF00 + value*0x10001
    end
    return color+0xFF000000
end

if memory.usememorydomain("EWRAM") then

    player_x = memory.read_u32_le(player_x_addr)
    player_y = memory.read_u32_le(player_y_addr)
    console.log("Starting script at frame: " .. emu.framecount() .. " with X: " .. player_x .. ", Y: " .. player_y)
    emu.frameadvance()

    while true do
        if framecount > emu.framecount() then
            x = {}
            y = {}
        end

        player_x_old = player_x
        player_x = memory.read_u32_le(player_x_addr)
        player_y_old = player_y
        player_y = memory.read_u32_le(player_y_addr)

        speed_x = player_x -player_x_old
        speed_y = player_y -player_y_old

        for i=25, 1, -1 do
            x[i]=x[i-1]
            y[i]=y[i-1]
            gui.pixelText(0, 0+i*6, x[i], decide_color(x[i], x_middle, x_max))
            gui.pixelText(219, 0+i*6, y[i], decide_color(y[i], y_middle, y_max))
        end

        x[0] = speed_x
        y[0] = speed_y

        gui.pixelText(0, 0, x[0], decide_color(x[0], x_middle, x_max))
        gui.pixelText(219, 0, y[0], decide_color(y[0], y_middle, y_max))

        framecount = emu.framecount()

        emu.frameadvance()
    end
else
    console.log("Error: failed to set EWRAM memory domain")
end