Break up Effects.js

src/effects/background/bloomingPetals.js

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+const constants = require('../../constants');
+const {hexToRgb} = require('../../utils');
+const drawPetal = require('../../shapes/petal');
+
+// This effect is slightly modified from Poetry background effect 'blooming'
+// https://github.com/code-dot-org/code-dot-org/blob/381e9b93f7cbd081738dfa7adbc9e7ce4e169a0c/apps/src/p5lab/poetry/commands/backgroundEffects.js#L245
+module.exports = function (p5, getCurrentPalette, colorFromPalette) {
+  return {
+    colorIndex: 0,
+    petals: [],
+    paletteLength: 0,
+    addPetalLayer: function (color, layer) {
+      for (let i = 0; i < 8; i++) {
+        this.petals.push({
+          theta: 45 * i,
+          length: 10 + 140 * layer,
+          ...color,
+        });
+      }
+    },
+    init: function () {
+      this.paletteLength = constants.PALETTES[getCurrentPalette()].length;
+      this.petals = [];
+      // Initialize with enough petals to fill the screen - this is mostly
+      // useful so that preview shows what the background actually looks like.
+      // Increment from 3 down to 0 so that petals are layered correctly with
+      // bigger petals behind smaller petals.
+      for (let layer = 3; layer >= 0; layer--) {
+        const color = colorFromPalette(this.colorIndex);
+        this.addPetalLayer(hexToRgb(color), layer);
+        this.colorIndex = (this.colorIndex + 1) % this.paletteLength;
+      }
+    },
+    draw: function () {
+      p5.push();
+      p5.strokeWeight(2);
+      if (p5.World.frameCount % 70 === 0) {
+        const color = colorFromPalette(this.colorIndex);
+        this.addPetalLayer(hexToRgb(color), 0 /* layer */);
+        this.colorIndex = (this.colorIndex + 1) % this.paletteLength;
+      }
+      const petalWidth = 35;
+      this.petals.forEach(petal => {
+        // Multiply each component by 0.8 to have the stroke color be
+        // slightly darker than the fill color.
+        p5.stroke(
+          p5.color(petal.R * 0.8, petal.G * 0.8, petal.B * 0.8)
+        );
+        p5.fill(p5.color(petal.R, petal.G, petal.B));
+        drawPetal(p5, petal.length, petal.theta, petalWidth);
+        petal.theta = (petal.theta + 0.5) % 360;
+        petal.length += 2;
+      });
+      this.petals = this.petals.filter(petal => petal.length < 700);
+      p5.pop();
+    },
+  };
+};

src/effects/background/circles.js

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+module.exports = function (p5, lerpColorFromPalette) {
+  return {
+    hue: 0,
+    update: function () {
+      this.hue += 25;
+    },
+    draw: function ({isPeak}) {
+      if (isPeak) {
+        this.update();
+      }
+      p5.push();
+      p5.noStroke();
+      p5.ellipseMode(p5.CENTER);
+      p5.translate(200, 200);
+      for (let i = 5; i > -1; i--) {
+        p5.fill(lerpColorFromPalette(((this.hue + i * 10) % 360) / 360));
+        p5.ellipse(0, 0, i * 100 + 75, i * 100 + 75);
+      }
+      p5.pop();
+    },
+  };
+};

src/effects/background/clouds.js

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+const {getP5Color} = require('../../utils');
+
+// This effect is slightly modified from Poetry background effect 'clouds'
+// https://github.com/code-dot-org/code-dot-org/blob/381e9b93f7cbd081738dfa7adbc9e7ce4e169a0c/apps/src/p5lab/poetry/commands/backgroundEffects.js#L368
+module.exports = function (p5, lerpColorFromPalette) {
+  return {
+    tileSize: 20,
+    tiles: [],
+    init: function () {
+      const noiseScale = 0.05;
+      this.tiles = [];
+      let xnoise = 0.01;
+      let ynoise = 0.01;
+      for (let x = 0; x < 400; x += this.tileSize) {
+        xnoise = 0.01;
+        for (let y = 0; y < 400; y += this.tileSize) {
+          this.tiles.push({
+            x,
+            y,
+            xnoise,
+            ynoise,
+          });
+          xnoise += noiseScale;
+        }
+        ynoise += noiseScale;
+      }
+    },
+    draw: function () {
+      const speed = 0.015;
+      let backgroundAmount = 0;
+      p5.push();
+      p5.noStroke();
+      backgroundAmount += speed;
+      p5.background(
+        lerpColorFromPalette(backgroundAmount)
+      );
+      this.tiles.forEach(tile => {
+        tile.alpha = p5.noise(tile.xnoise, tile.ynoise) * 255;
+        tile.xnoise += speed;
+        tile.ynoise += speed;
+        p5.fill(getP5Color(p5, '#ffffff', tile.alpha));
+        p5.rect(tile.x, tile.y, this.tileSize, this.tileSize);
+      });
+      p5.pop();
+    },
+  };
+};

src/effects/background/colorCycle.js

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+module.exports = function (p5, lerpColorFromPalette) {
+  return {
+    color: 0,
+    update: function () {
+      this.color += 0.03;
+    },
+    draw: function ({isPeak}) {
+      if (isPeak) {
+        this.update();
+      }
+      p5.background(lerpColorFromPalette(this.color));
+    },
+  };
+};

src/effects/background/diamonds.js

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+module.exports = function (p5, lerpColorFromPalette, getInPreviewMode) {
+  return {
+    hue: 0,
+    update: function () {
+      this.hue += 25;
+    },
+    draw: function ({isPeak, centroid}) {
+      if (isPeak) {
+        this.update();
+      }
+      const centroidValue = this.getPreviewCustomizations().getCentroid(centroid);
+      p5.push();
+      p5.rectMode(p5.CENTER);
+      p5.translate(200, 200);
+      p5.rotate(45);
+      p5.noFill();
+      p5.strokeWeight(p5.map(centroidValue, 0, 4000, 0, 50));
+      for (let i = 5; i > -1; i--) {
+        p5.stroke(lerpColorFromPalette(((this.hue + i * 10) % 360) / 360));
+        p5.rect(0, 0, i * 100 + 50, i * 100 + 50);
+      }
+      p5.pop();
+    },
+    getPreviewCustomizations: function () {
+      return getInPreviewMode() ?
+        {getCentroid: () => 2000} :
+        {getCentroid: centroid => centroid};
+    },
+  };
+};

src/effects/background/disco.js

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+module.exports = function (p5, lerpColorFromPalette, randomNumber) {
+  return {
+    bg: undefined,
+    colors: [],
+    squaresPerSide: 4,
+    minColorChangesPerUpdate: 5,
+    maxColorChangesPerUpdate: 9,
+    init: function () {
+      if (this.colors.length) {
+        return;
+      }
+      // Alpha is ignored for this effect to avoid memory leaks with too many
+      // layers of alpha blending.
+      this.colors.length = this.squaresPerSide * this.squaresPerSide;
+      for (let i = 0; i < this.colors.length; i++) {
+        this.colors[i] = lerpColorFromPalette(p5.random(0, 1));
+      }
+    },
+    update: function () {
+      const numChanges = randomNumber(
+        this.minColorChangesPerUpdate,
+        this.maxColorChangesPerUpdate
+      );
+      for (let i = 0; i < numChanges; i++) {
+        const loc = randomNumber(0, this.colors.length);
+        this.colors[loc] = lerpColorFromPalette(p5.random(0, 1));
+      }
+    },
+    draw: function ({isPeak}) {
+      if (isPeak) {
+        this.update();
+      }
+      p5.push();
+      p5.noStroke();
+      const squareWidth = p5.width / this.squaresPerSide;
+      const squareHeight = p5.height / this.squaresPerSide;
+      for (let i = 0; i < this.colors.length; i++) {
+        p5.fill(this.colors[i]);
+        p5.rect(
+          (i % this.squaresPerSide) * squareWidth,
+          Math.floor(i / this.squaresPerSide) * squareHeight,
+          squareWidth,
+          squareHeight
+        );
+      }
+      p5.pop();
+    },
+  };
+};

src/effects/background/discoBall.js

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+const drawSparkle = require("../../shapes/sparkle");
+
+module.exports = function (p5, lerpColorFromPalette, colorFromPalette) {
+  return {
+    stars: [],
+    globe: function (u, v) {
+      u = p5.constrain(u, -90, 90);
+      return {
+        x: (1 + p5.sin(u) * p5.sin(v)) * 45 + 155,
+        y: (1 + p5.cos(v)) * 45 + 10,
+      };
+    },
+    quad: function (i, j, faceSize, rotation = 0) {
+      const k = ((i + rotation) % 360) - 180;
+      if (k < -90 - faceSize || k > 90) {
+        return;
+      }
+      const color = lerpColorFromPalette(p5.noise(i, j, p5.frameCount / 70));
+      const highlight = 50 * p5.pow(p5.cos(k), 2);
+      const brightness =
+      p5.noise(i, j, p5.frameCount / 50) * 150 + 100 + highlight;
+      p5.fill(p5.lerpColor(color, p5.color(brightness), brightness / 255));
+      const a = this.globe(k, j);
+      const b = this.globe(k + faceSize, j);
+      const c = this.globe(k + faceSize, j + faceSize);
+      const d = this.globe(k, j + faceSize);
+      p5.quad(a.x, a.y, b.x, b.y, c.x, c.y, d.x, d.y);
+    },
+    init: function () {
+      this.stars.length = 0;
+
+      for (let i = 0; i < 75; i++) {
+        this.stars.push({
+          x: p5.random(0, 400),
+          y: p5.random(0, 250),
+          color: p5.lerpColor(
+          lerpColorFromPalette(p5.random()),
+          p5.color('#fff'),
+          0.75
+        ),
+        });
+      }
+    },
+    draw: function () {
+      p5.noFill();
+    // Draw a horizontal gradient of the palette colors to the background
+      let ctx = p5._renderer.drawingContext;
+      ctx.save();
+      let gradient = ctx.createLinearGradient(425, 425, 425, 0);
+    // Initialize first color stop so colors loop
+      let color = colorFromPalette(0);
+      gradient.addColorStop(0, color);
+      for (let i = 0; i < 5; i++) {
+        let color = colorFromPalette(i);
+        gradient.addColorStop((5 - i) / 5, color.toString());
+      }
+      ctx.fillStyle = gradient;
+      ctx.fillRect(0, 0, 425, 425);
+      ctx.restore();
+
+      p5.noStroke();
+
+      for (const star of this.stars) {
+        const distanceFromCenter = 200 - star.x;
+        const opacity = p5.constrain(p5.cos(distanceFromCenter / 2), 0, 4);
+        const heightFade = p5.constrain(250 - star.y, 0, 500);
+        p5.push();
+        p5.translate(star.x, star.y);
+        const sparkle = p5.constrain(
+        p5.noise(star.x / 50, star.y / 50, p5.frameCount / 50) + 0.4,
+        0,
+        1
+      );
+        p5.drawingContext.globalAlpha = opacity * (heightFade / 100) * 0.85;
+        p5.scale(1 / sparkle);
+        drawSparkle(p5._renderer.drawingContext, star.color);
+        p5.pop();
+
+      // Move the star to the left.
+        star.x -= 4.5 - opacity * 1.5;
+
+      // If we've gone off-screen, loop around to the right.
+        if (star.x < 0) {
+          star.x = 400;
+        }
+      }
+
+      p5.noiseDetail(50, 0.5);
+      p5.stroke('#999');
+      p5.strokeWeight(2);
+      p5.line(200, 0, 200, 15);
+      p5.strokeWeight(0.25);
+
+      const step = 20;
+      for (let i = 0; i <= 360; i += step) {
+        for (let j = 0; j < 180; j += step) {
+          p5.push();
+          this.quad(i, j, step, p5.frameCount * 2);
+          p5.pop();
+        }
+      }
+    },
+  };
+};