Willmott squares

Inspired by Logan Willmott on twitter: twitter.com/__lw/status/1105897541206335488

I think Logan is interpolating angle values over a grid instead of using sin/cos, but I can't prove it.
I wonder if I could use a plasma generator, then the value at each cell would be the angle....

Created by imakerobots on 2019/3/14
199
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Canvas.setpenopacity(1);

// Global code will be evaluated once.
const turtle = new Turtle();
turtle.penup();
turtle.goto(-50,-20);
turtle.pendown();

const width=195;
const height=195;
const cubesPerSide=40;
const cubeSpacing=width/(cubesPerSide);
const cubeSize=width/(cubesPerSide*0.95);
const minX=-(width)/2 ;
const minY=-(height)/2;

// The walk function will be called until it returns false.
function walk(i) {
    for(let y=0;y<cubesPerSide;++y) {
        for(x=0;x<cubesPerSide;++x) {
            turtle.penup();
            turtle.goto(minX+x*cubeSpacing+cubeSpacing/2,minY+y*cubeSpacing+cubeSpacing/2);
            
            // play with these numbers to get new effects! DO IIIIIIT~~~!
            turtle.setheading(
                Math.sin(1.1*x/cubesPerSide)*150
                +Math.cos(12.5*(x+y)/cubesPerSide)*25);
                
            turtle.forward(cubeSize/2); turtle.right(90);
            turtle.pendown();
            turtle.forward(cubeSize/2); turtle.right(90);
            turtle.forward(cubeSize); turtle.right(90);
            turtle.forward(cubeSize); turtle.right(90);
            turtle.forward(cubeSize); turtle.right(90);
            turtle.forward(cubeSize/2); 
        }
    }
    return false;
}