dxDrawRectangle 3D size

[Modafinil]

Hello everyone !

I'm trying to create a 3D rectangle using dxDrawRectangle + getScreenFromWorldPosition to function as a health bar. I'm having difficulty adjusting the width and height. I want the rectangle to get smaller as it moves away from the ped, until it is no longer rendered.

    local x, y, z = getElementPosition(ped)
    local lpx, lpy, lpz  = getElementPosition(localPlayer)
    local dist = getDistanceBetweenPoints3D(x, y, z, lpx, lpy, lpz)
    if dist > 20 then return end
    local x2, y2 = getScreenFromWorldPosition(x, y, z)
    local health = getElementHealth(ped)
    local per = (health * 70) / 100
    dxDrawRectangle(x2, y2, 70, 9, tocolor(128, 0, 0, 255))
    dxDrawRectangle(x2, y2, per, 9, tocolor(255, 0, 0, 255))

Could someone help me find the correct calculation?