User File #638486436516878236

--[[ @inconsistent_dg
for calculating horizontal (X+Z) and vertical (Y) speed in 3D games.
in some cases "speed" might be the wrong term, since it's only 
finding distance traveled. should be able to remake for use in a 2D game
--]]

local prevX = 0
local prevY = 0
local prevZ = 0
local prevFrameCount = emu.framecount()

while true do
    memory.usememorydomain("Main RAM")   -- change/remove this if needed
                                            -- DS required it in my case
    local currentX = memory.read_s32_le(0x0EBD78) -- replace with your X
    local currentY = memory.read_s32_le(0x0EBD7C) -- replace with your Y
    local currentZ = memory.read_s32_le(0x0EBD80) -- replace with your Z
    
    -- get difference in frame count
    local currentFrameCount = emu.framecount()
    local frameDifference = currentFrameCount - prevFrameCount
    
    -- calculate horizontal speed
    local speed = 0
    if frameDifference ~= 0 then
        local deltaX = currentX - prevX   -- delta means change in value
        local deltaZ = currentZ - prevZ   -- delta means change in value
        local distance = math.sqrt(deltaX * deltaX + deltaZ * deltaZ)
                                                  -- pythagorean theorem
        speed = math.floor(distance / frameDifference + 0.5)
           -- if you don't want it to round down, then remove math.floor
                                   -- speed = distance / frameDifference
    end
    
    -- calculate vertical speed
    local speedY = 0
    if frameDifference ~= 0 then
        local deltaY = currentY - prevY
        speedY = math.floor(deltaY / frameDifference + 0.5)
                          -- no pythagorean theorem because Y = one axis
    end
    
    -- displays
    gui.text(1, 80, "Horizontal Speed: " .. speed)
    gui.text(1, 100, "Vertical Speed: " .. speedY)
    
    -- update previous
    prevX = currentX
    prevY = currentY
    prevZ = currentZ
    prevFrameCount = currentFrameCount
    
    emu.frameadvance() -- needed to not crash
end
User File #638486436516878236

#638486436516878236 - Speed Calculation from Position
