// https://editor.p5js.org/codingtrain/sketches/egvieHyt0

// https://thecodingtrain.com/challenges/134-heart-curve

// https://youtu.be/oUBAi9xQ2X4

​

// Heart curve equations from http://www.mathematische-basteleien.de/heart.html

// https://mathworld.wolfram.com/HeartCurve.html

​

// Note that two and four render the slowest

​

let h1

let a = 0;

const e = 2.71828;

const Y_AXIS = 1;

const X_AXIS = 2;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  h1 = new Heart1(width * 1 / 2, height * 3 / 4, windowHeight*0.018);

}

​

function draw() {

  background(0);

  noStroke();

  h1.show();

}

​

// function mousePressed() {

//   save('heart.jpg');

//  }

​

function setGradientL(x, y, w, h, c1, c2, axis) {

  noFill();

​

  if (axis === Y_AXIS) {

    // Top to bottom gradient

    for (let i = y; i <= y + h; i++) {

      let inter = map(i, y, y + h, 0, 1);

      let c = lerpColor(c1, c2, inter);

      stroke(c);

      line(x, i, x + w, i);

    }

  } else if (axis === X_AXIS) {

    // Left to right gradient

    for (let i = x; i <= x + w; i++) {

      let inter = map(i, x, x + w, 0, 1);

      let c = lerpColor(c1, c2, inter);

      stroke(c);

      line(i, y, i, y + h);

    }

  }

}

​

function setGradientR(x, y, w, h, c1, c2, axis) {

  noFill();

​

  if (axis === Y_AXIS) {

    // Top to bottom gradient

    for (let i = y; i <= y + h; i++) {

      let inter = map(i, y, y + h, 0.0, 1);

      let c = lerpColor(c1, c2, inter);

      stroke(c);

      line(x, i, x + w, i);

    }

  } else if (axis === X_AXIS) {

    // Left to right gradient

    for (let i = x; i <= x + w; i++) {

      let inter = map(i, x, x + w, 0, 1.75);

      let c = lerpColor(c1, c2, inter);

      stroke(c);

      line(i, y, i, y + h);

    }

  }

}