Piangle / emma-ba | Observable

emma-ba

Workspace

Public

Edited

Sep 23, 2024

Fork of Piangle

test16 = {

const u = 2; // unit

const wu = 500; // no. units on width

const hu = 150; // no. units on height

const width = wu*u*2; // double the units to have spaces between squares

const height = hu*u;

// const col = ['#00f','#000','#666','#900','#0f0','#f00','#0f0','#900','#0f0','#0f0'];

const col = ['#00f','#000','#c00','#0f0','#f0f','#09f','#666','#fff','#999','#f60'];

const start = 0;

const rep = 0;

const thres = 5;

const D = Decimal.clone({precision: wu*2+1});

const one = D(1), four = D(4);

const a = four.times(arctan(one.div(5)));

const b = arctan(one.div(239));

const pi = four.times(a.minus(b));

const p = pi.toFixed(wu*3);

let data = [[]];

const base = [3];

for (let i = 1; i < wu*3; ++i) {base[i] = p[i+1]*1;}

data[0] = base;

for (let h = 1; h < hu; ++h){

data[h] = [];

for (let w = 0; w < wu*3; ++w) {

if(w < h){ data[h][w] = 0; } else {

let l = data[h-1][w];

let r = data[h-1][w-1];

let diff = Math.abs(l - r);

let sum = l + r;

let new_d = start;

if(l==r){new_d = r;}

else if(l%r==0){new_d = r;}

else if(r%l==0){new_d = l;}

//else if(l>r){new_d = l%r;}

//else if(r>l){new_d = r%l;}

if(diff > thres){ new_d = diff ;}

if(sum > thres){ new_d = sum ;}

data[h][w] = new_d % 10;

}

const { canvas, context } = createCanvas();

const pixelRatio = resize(canvas, width, height, );

context.globalAlpha = 1;

context.scale(pixelRatio, pixelRatio);

context.fillStyle = 'black';

context.fillRect(0, 0, width, height);

let x, y, digit;

for (let h = 0; h < hu; ++h){

for (let w = 0; w < wu; ++w) {

if(w >= h){

digit = data[h][w]*1;

x = u*w*2 -h*u;

y = (hu-h-1)*u;

context.fillStyle = col[digit];

context.fillRect(x, y, u, u);

// context.fillStyle = "#f00";

// context.fillText(digit, x , y +u );

}

return canvas;

}

testttt4 = {

const u = 2; // unit

const wu = 500; // no. units on width

const hu = 150; // no. units on height

const col = ['#000','#009','#09f','#666','#900','#f00','#f90','#ddd','#060','#0c0'];

const start = 0;

const base = get_pi(wu*2);

let data = [[]];

data[0] = base;

for (let h = 1; h < hu; ++h){

data[h] = [];

for (let w = 0; w < wu*2; ++w) {

let r = data[h-1][w+1];// +1;

let l = data[h-1][w];// +1;

let diff = Math.abs(l-r);

let new_d;

if(diff == 0){

new_d = l-1;

} else {

new_d = diff;

if(l>1 & r>1){

let small = Math.min(l,r);// +1;

let big = Math.max(l,r);// -1;

let mod = big % small;

if(mod == 0){ new_d = small +1;}

else{ new_d = small + mod;}

}

data[h][w] = new_d;// % 10;

}