Linear Interpolation

Examples
1

Hey! I recently discovered that lua lacks a pre-wrote function for Linear interpolation. So I decided to write my own!

function lerp(pos1, pos2, perc)
    return (1-perc)*pos1 + perc*pos2 -- Linear Interpolation
end

This could be used in so many ways! From animations, to just trying to get that sweet spot on the screen. This is sure to come in handy!

EX:


-- Linear Interpolation

-- Use this function to perform your initial setup
function setup()
    print("Hello World!")
    t=1
end

function lerp(pos1, pos2, perc)
    return (1-perc)*pos1 + perc*pos2 -- Linear Interpolation
end

-- This function gets called once every frame
function draw()
    -- This sets a dark background color 
    fontSize(50)
    strokeWidth(5)
    background(255, 0, 221, 255)
    if t > 1 then t=0 end
    t = t + 0.01
    -- This sets the line thickness
    text("Purple rain", lerp(0, WIDTH, t), lerp(0, HEIGHT, t))
    fill(255, 255, 255, 255)
    -- Do your drawing here
    
end
2

But shouldn’t the rain go down? Interesting Gravity crisis… Any ways, good way, I learned something new :wink:

3

For a reason, codes break up for me,

t=0
function lerp(pos1, pos2, perc)
return perc*(pos1+pos2) – Linear Interpolation
end function draw()
fontSize(50) background(255, 0, 221, 255) if t > 1 then t=0 end t = t + 0.02 for x = 1, 10 do for y = 1, 10 do
text("

4

Weird

5

@LuaLlama Have you looked at the tween functions. Those can do what you did and they have a lot more functionality.

displayMode(FULLSCREEN)

function setup()
    sp={x=0,y=0}
    tween(2,sp,{x=WIDTH,y=HEIGHT},{loop=tween.loop.forever})
    fontSize(50)
end

function draw()
    background(255, 0, 221, 255)
    fill(255)
    text("Purple Rain",sp.x,sp.y)
end
6

I’ll look at that Dave, thanks!