BallOfLife

docs/README.md

@@ -0,0 +1,28 @@
+Run the app from this directory:
+
+```sh
+python3 serve.py --port 5501
+```
+
+Open http://localhost:5501/wave-machine or
+http://localhost:5501/minds-eye-is-full-of-flowers.
+Preset names are case-insensitive; replace spaces with hyphens (URL-encoded
+spaces also work). Loading a preset from the Presets menu updates the URL,
+and browser Back/Forward loads the corresponding preset.
+
+Built-in presets work in any browser. Saved presets only work where they are
+stored in localStorage, on the same browser and origin (including port).
+Unknown names show a message and leave an empty scene.
+
+Use this server for direct links and refreshes. An alternative host must serve
+`index.html` for preset paths; trailing slashes should redirect to the same path
+without the slash so relative assets load correctly.
+
+For **ball of life**, enter cylinder height/radius, ball radius, and ground line
+length in centimetres. Point spacing is also in centimetres (10 means one point
+every 10 cm). A 1000 cm column at 10 cm spacing has 101 points including the
+base and top. Ground lines continue from the base without duplicating its point.
+If a length is not divisible by its spacing, the remaining end section is empty.
+Ball spacing follows each longitude from pole to pole along the surface; both
+poles are included, so the final gap may be shorter. Longitude lines remain a
+total count. Zoom changes only the view, not the physical dimensions or counts.

docs/index.html

@@ -4,7 +4,7 @@
 <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
 <head>
   <title>mathfunk</title>
-  <link rel="stylesheet" href="./css/styles.css">
+  <link rel="stylesheet" href="./css/styles.css?v=cm-sliders-3">
 </head>
 
 <body style="margin:0;">
@@ -43,12 +43,13 @@
 
 <!-- Control system -->
 <script src="./js/controls/FilterManager.js" type="text/javascript"></script>
-<script src="./js/controls/ControlFactory.js" type="text/javascript"></script>
+<script src="./js/controls/ControlFactory.js?v=cm-sliders-3" type="text/javascript"></script>
 <script src="./js/controls/ControlManager.js" type="text/javascript"></script>
 <script src="./js/presets.js" type="text/javascript"></script>
 <script src="./js/controls/SceneUI.js" type="text/javascript"></script>
 
 <!-- Shape definitions -->
+<script src="./js/shapes/BallOfLife.js?v=lighting-1" type="text/javascript"></script>
 <script src="./js/shapes/PolyTwistColourWidth.js" type="text/javascript"></script>
 <script src="./js/shapes/FloralPhyllo.js" type="text/javascript"></script>
 <script src="./js/shapes/SpiralWormhole.js" type="text/javascript"></script>

docs/js/controls/ControlFactory.js

@@ -87,7 +87,7 @@ class ControlFactory {
     // Label showing property name
     const label = document.createElement('span');
     label.className = 'control-label-inline';
-    label.textContent = config.property;
+    label.textContent = config.label || config.property;
 
     // Value display (editable)
     const valueDisplay = document.createElement('span');
@@ -102,6 +102,7 @@ class ControlFactory {
     input.id = `el${config.property}`;
     input.min = config.min;
     input.max = config.max;
+    input.step = config.step ?? 1;
     input.value = instance[config.property] ?? config.defaultValue;
 
     // Store original config bounds for reference
@@ -296,7 +297,7 @@ class ControlFactory {
 
     const label = document.createElement('span');
     label.className = 'control-label-inline';
-    label.textContent = config.property;
+    label.textContent = config.label || config.property;
 
     const input = document.createElement('input');
     input.type = 'color';
@@ -351,7 +352,7 @@ class ControlFactory {
 
     const label = document.createElement('span');
     label.className = 'control-label-inline';
-    label.textContent = config.property;
+    label.textContent = config.label || config.property;
 
     const input = document.createElement('input');
     input.type = 'checkbox';
@@ -393,7 +394,7 @@ class ControlFactory {
     const label = document.createElement('p');
     label.className = 'control-label';
     label.id = `elText${config.property}`;
-    label.textContent = `${config.property}: ${config.defaultValue}`;
+    label.textContent = config.label || `${config.property}: ${instance[config.property] ?? config.defaultValue}`;
 
     const select = document.createElement('select');
     select.className = 'control control-dropdown';
@@ -410,7 +411,7 @@ class ControlFactory {
     const listener = (event) => {
       const newValue = event.target.value;
       instance[config.property] = newValue;
-      label.textContent = `${config.property}: ${newValue}`;
+      label.textContent = config.label || `${config.property}: ${newValue}`;
       if (config.callback) {
         config.callback(instance, newValue);
       }

docs/js/controls/SceneUI.js

@@ -213,6 +213,39 @@ class SceneUI {
     if (index >= 0 && index < presets.length) {
       this.scene.importFromJSON(presets[index].data, this);
       this.hidePresetsModal();
+      const name = this.presetSlug(presets[index].name);
+      if (name && this.presetBasePath !== undefined) {
+        history.pushState(null, '', this.presetBasePath + encodeURIComponent(name));
+      }
+    }
+  }
+
+  presetSlug(name) {
+    return name.trim().toLowerCase().replace(/\s+/g, '-');
+  }
+
+  loadPresetFromPath() {
+    const path = window.location.pathname;
+    if (!path.startsWith(this.presetBasePath)) return;
+    let name;
+    try {
+      name = decodeURIComponent(path.slice(this.presetBasePath.length).replace(/\/$/, ''));
+    } catch {
+      return;
+    }
+    if (!name || name === 'index.html') {
+      this.scene.clear();
+      this.clearAllPanels();
+      return;
+    }
+    const presets = [...this.getBuiltInPresets(), ...this.getPresets()];
+    const preset = presets.find(item => this.presetSlug(item.name) === this.presetSlug(name));
+    if (preset) {
+      this.scene.importFromJSON(preset.data, this);
+    } else {
+      this.scene.clear();
+      this.clearAllPanels();
+      alert(`Preset "${name}" was not found. Choose a preset from the Presets menu.`);
     }
   }
 

docs/js/index.js

@@ -25,6 +25,9 @@ engine.setScene(scene);
 
 // Initialize Scene UI
 const sceneUI = new SceneUI(scene, 'layers-container');
+sceneUI.presetBasePath = new URL('../', document.currentScript.src).pathname;
+sceneUI.loadPresetFromPath();
+window.addEventListener('popstate', () => sceneUI.loadPresetFromPath());
 
 // ============================================
 // Event Listeners

docs/js/shapes/BallOfLife.js

@@ -0,0 +1,252 @@
+/**
+ * BallOfLife - A cylinder supporting a sphere, projected onto the 2D canvas.
+ */
+class BallOfLife extends BaseShape {
+  static config = [
+    { type: 'header', text: 'Point spacing & dimensions (cm)' },
+    { type: 'range', min: 1, max: 100, defaultValue: 6, property: 'pointsPerRow', label: 'Columns around cylinder (total)' },
+    { type: 'range', min: 1, max: 1000, step: 0.1, defaultValue: 30.4, property: 'columnSpacingCm', label: 'Column: point every (cm)' },
+    { type: 'range', min: 1, max: 12, defaultValue: 3, property: 'pointSize' },
+    { type: 'color', defaultValue: [255, 53, 53], property: 'pointColor' },
+    { type: 'header', text: 'Cylinder' },
+    { type: 'range', min: 1, max: 3000, step: 0.1, defaultValue: 103.9, property: 'cylinderRadiusCm', label: 'Cylinder radius (cm)' },
+    { type: 'range', min: 1, max: 10000, step: 0.1, defaultValue: 1000, property: 'columnHeightCm', label: 'Column height (cm)' },
+    { type: 'range', min: -360, max: 360, defaultValue: 0, property: 'twist' },
+    { type: 'header', text: 'Sphere' },
+    { type: 'range', min: 1, max: 3000, step: 0.1, defaultValue: 300, property: 'sphereRadiusCm', label: 'Ball radius (cm)' },
+    { type: 'range', min: 1, max: 1000, step: 0.1, defaultValue: 30.4, property: 'longitudeSpacingCm', label: 'Longitude: point every (cm)' },
+    { type: 'range', min: 3, max: 100, defaultValue: 17, property: 'longitudeCount', label: 'Longitude lines (total)' },
+    { type: 'header', text: 'View' },
+    { type: 'range', min: -80, max: 80, defaultValue: 7, property: 'tilt' },
+    { type: 'range', min: 10, max: 200, defaultValue: 124, property: 'zoomPercent' },
+    { type: 'range', min: 0, max: 100, defaultValue: 50, property: 'perspectiveStrength' },
+    { type: 'header', text: 'Rings' },
+    { type: 'checkbox', defaultValue: true, property: 'showRings' },
+    { type: 'color', defaultValue: [191, 199, 213], property: 'ringColor' },
+    { type: 'range', min: 1, max: 8, defaultValue: 1.5, property: 'ringWidth' },
+    { type: 'header', text: 'Ground Points' },
+    { type: 'checkbox', defaultValue: true, property: 'showGroundSpray' },
+    { type: 'range', min: 1, max: 1000, step: 0.1, defaultValue: 30.4, property: 'groundSpacingCm', label: 'Ground: point every (cm)' },
+    { type: 'range', min: 0, max: 10000, step: 0.1, defaultValue: 900, property: 'groundLengthCm', label: 'Ground line length (cm)' },
+    { type: 'color', defaultValue: [255, 53, 53], property: 'sprayColor' },
+    { type: 'range', min: 1, max: 12, defaultValue: 3, property: 'groundPointSize' },
+    { type: 'header', text: 'Animation' },
+    { type: 'dropdown', defaultValue: 'steady', property: 'lightingEffect', label: 'Lighting effect', options: [
+      { value: 'steady', label: 'Steady (no animation)' },
+      { value: 'pulse', label: 'Pulse' },
+      { value: 'wave', label: 'Rising wave' },
+      { value: 'chase', label: 'Rotating chase' },
+      { value: 'sparkle', label: 'Sparkle' },
+      { value: 'rainbow', label: 'Rainbow flow' },
+    ] },
+    { type: 'range', min: 0, max: 300, defaultValue: 100, property: 'lightingSpeed', label: 'Lighting speed (%)' },
+    { type: 'checkbox', defaultValue: false, property: 'autoRotate' },
+    { type: 'range', min: 0, max: 200, defaultValue: 100, property: 'rotateSpeed' },
+    { type: 'checkbox', defaultValue: false, property: 'reverseRotation' },
+    { type: 'header', text: 'Stickman (scale reference)' },
+    { type: 'checkbox', defaultValue: true, property: 'showStickman', label: 'Show stickman' },
+    { type: 'range', min: 1, max: 300, step: 0.1, defaultValue: 175, property: 'stickmanHeightCm', label: 'Stickman height (cm)' },
+  ];
+
+  constructor(...values) {
+    super();
+    // Match the registry's positional config arguments.
+    BallOfLife.config.filter(item => item.property).forEach((item, index) => {
+      const value = values[index] ?? item.defaultValue;
+      this[item.property] = Array.isArray(value) ? [...value] : value;
+    });
+  }
+
+  // Apply a 3x3 rotation matrix, then perspective divide. Strength 0 is orthographic.
+  project(x, y, z, matrix, scale) {
+    const rx = matrix[0] * x + matrix[1] * y + matrix[2] * z;
+    const ry = matrix[3] * x + matrix[4] * y + matrix[5] * z;
+    const rz = matrix[6] * x + matrix[7] * y + matrix[8] * z;
+    const halfHeight = this.columnHeightCm / 600;
+    const bound = Math.max(
+      Math.hypot(this.cylinderRadiusCm / 300 +
+        (this.showGroundSpray ? Math.max(0, this.groundLengthCm) / 300 : 0), halfHeight),
+      halfHeight + 2 * this.sphereRadiusCm / 300,
+      this.showStickman ? Math.hypot(
+        this.cylinderRadiusCm / 300 + this.stickmanHeightCm / 300 * 0.6,
+        halfHeight + this.stickmanHeightCm / 300
+      ) : 0
+    );
+    // Keep the shapes and ground spray in front of the camera at maximum perspective.
+    const distance = Math.max(6, bound * 2.5);
+    const strength = Math.max(0, Math.min(100, this.perspectiveStrength)) / 50;
+    const perspective = distance / (distance + rz * strength);
+    return {
+      x: centerX + rx * scale * perspective,
+      y: centerY + ry * scale * perspective,
+      depth: rz,
+      perspective,
+      worldX: x,
+      worldY: y,
+      worldZ: z,
+    };
+  }
+
+  draw(elapsed) {
+    this.updateFilters(elapsed);
+    const columns = Math.max(1, Math.min(100, Math.round(this.pointsPerRow)));
+    const rows = Math.floor(this.columnHeightCm / this.columnSpacingCm + 1e-9) + 1;
+    const direction = this.reverseRotation ? -1 : 1;
+    const angle = this.autoRotate ? elapsed * this.speedMultiplier / 200 * (this.rotateSpeed / 100) * direction : 0;
+    const tilt = this.tilt * Math.PI / 180;
+    const ca = Math.cos(angle), sa = Math.sin(angle);
+    const ct = Math.cos(tilt), st = Math.sin(tilt);
+    // R_x(tilt) * R_y(angle): spin around the cylinder axis, then tilt the view.
+    const matrix = [ca, 0, sa, st * sa, ct, -st * ca, -ct * sa, st, ct * ca];
+    const scale = Math.min(ctx.canvas.width / 6, ctx.canvas.height / 10) * this.zoomPercent / 100;
+    const radius = this.cylinderRadiusCm / 300;
+    const halfHeight = this.columnHeightCm / 600;
+    const points = [];
+
+    for (let row = 0; row < rows; row++) {
+      // Start at the base and keep the requested spacing exactly.
+      const fraction = 1 - row * this.columnSpacingCm / this.columnHeightCm;
+      const y = (2 * fraction - 1) * halfHeight;
+      for (let column = 0; column < columns; column++) {
+        const theta = 2 * Math.PI * column / columns + fraction * this.twist * Math.PI / 180;
+        points.push(this.project(radius * Math.cos(theta), y, radius * Math.sin(theta), matrix, scale));
+      }
+    }
+
+    const sphereRadius = this.sphereRadiusCm / 300;
+    // Seat the sphere in the hollow rim: radius² + centerOffset² = sphereRadius².
+    // A sphere narrower than the opening has no rim contact; place its equator at the rim.
+    const centerOffset = Math.sqrt(Math.max(0, sphereRadius * sphereRadius - radius * radius));
+    const sphereCenterY = -halfHeight - centerOffset;
+    const arcLength = Math.PI * this.sphereRadiusCm;
+    const latitudes = Math.ceil(arcLength / this.longitudeSpacingCm) + 1;
+    const longitudes = Math.max(3, Math.min(100, Math.round(this.longitudeCount)));
+    for (let latitude = 0; latitude < latitudes; latitude++) {
+      // Latitude runs from -90 to +90 degrees, including one point at each pole.
+      const phi = -Math.PI / 2 + Math.min(latitude * this.longitudeSpacingCm / this.sphereRadiusCm, Math.PI);
+      const pole = latitude === 0 || latitude === latitudes - 1;
+      const ringRadius = pole ? 0 : sphereRadius * Math.cos(phi);
+      const y = sphereCenterY + sphereRadius * Math.sin(phi);
+      const count = pole ? 1 : longitudes;
+      for (let longitude = 0; longitude < count; longitude++) {
+        const theta = 2 * Math.PI * longitude / longitudes;
+        points.push(this.project(ringRadius * Math.cos(theta), y,
+          ringRadius * Math.sin(theta), matrix, scale));
+      }
+    }
+
+    ctx.save();
+    if (this.showGroundSpray) {
+      const count = Math.floor(this.groundLengthCm / this.groundSpacingCm + 1e-9);
+      const length = Math.max(0, this.groundLengthCm) / 300;
+      for (let column = 0; column < columns; column++) {
+        // Match the twist at the cylinder base.
+        const theta = 2 * Math.PI * column / columns +
+          this.twist * Math.PI / 180;
+        for (let point = 1; point <= count; point++) {
+          // Continue outward from the base point without duplicating it.
+          const distance = radius + point * this.groundSpacingCm / 300;
+          if (length === 0) break;
+          const p = this.project(distance * Math.cos(theta), halfHeight,
+            distance * Math.sin(theta), matrix, scale);
+          points.push({ ...p, color: this.sprayColor, size: this.groundPointSize });
+        }
+      }
+    }
+    // Project circular rims using the same transform as the points.
+    ctx.strokeStyle = Array.isArray(this.ringColor) ? `rgb(${this.ringColor.join(',')})` : this.ringColor;
+    ctx.lineWidth = this.ringWidth;
+    for (const y of this.showRings ? [-halfHeight, halfHeight] : []) {
+      ctx.beginPath();
+      for (let i = 0; i < 128; i++) {
+        const theta = 2 * Math.PI * i / 128;
+        const p = this.project(radius * Math.cos(theta), y, radius * Math.sin(theta), matrix, scale);
+        if (i === 0) ctx.moveTo(p.x, p.y);
+        else ctx.lineTo(p.x, p.y);
+      }
+      ctx.closePath();
+      ctx.stroke();
+    }
+
+    // Paint far points first; perspective makes nearer points appear larger.
+    const lightingTime = elapsed * (this.speedMultiplier / 100) * (this.lightingSpeed / 100);
+    const baseAlpha = ctx.globalAlpha;
+    points.sort((a, b) => b.depth - a.depth);
+    for (const p of points) {
+      const lighting = this.pointLighting(p, lightingTime);
+      const color = lighting.color ?? p.color ?? this.pointColor;
+      ctx.globalAlpha = baseAlpha * lighting.brightness;
+      ctx.fillStyle = Array.isArray(color) ? `rgb(${color.join(',')})` : color;
+      ctx.beginPath();
+      ctx.arc(p.x, p.y, Math.max(0.5, p.size ?? this.pointSize) * p.perspective, 0, 2 * Math.PI);
+      ctx.fill();
+    }
+    ctx.globalAlpha = baseAlpha;
+    if (this.showStickman) {
+      this.drawStickman(halfHeight, radius, [1, 0, 0, 0, ct, -st, 0, st, ct], scale);
+    }
+    ctx.restore();
+  }
+
+  pointLighting(point, time) {
+    const turn = 2 * Math.PI;
+    const height = this.columnHeightCm / 600 - point.worldY;
+    const radialDistance = Math.hypot(point.worldX, point.worldZ);
+    const theta = Math.atan2(point.worldZ, point.worldX);
+    // Use physical coordinates so patterns remain attached to points while rotating.
+    const travel = height - radialDistance;
+    switch (this.lightingEffect) {
+      case 'pulse':
+        return { brightness: 0.15 + 0.85 * (0.5 + 0.5 * Math.sin(time * turn)) };
+      case 'wave':
+        return { brightness: 0.12 + 0.88 * Math.pow(0.5 + 0.5 * Math.cos(travel * 3 - time * turn), 4) };
+      case 'chase':
+        return { brightness: 0.12 + 0.88 * Math.pow(0.5 + 0.5 * Math.cos(theta - time * turn), 8) };
+      case 'sparkle': {
+        const seed = Math.sin(point.worldX * 127.1 + point.worldY * 311.7 + point.worldZ * 74.7) * 43758.5453;
+        const phase = seed - Math.floor(seed);
+        return { brightness: 0.1 + 0.9 * Math.pow(0.5 + 0.5 * Math.sin(time * turn * (0.7 + phase) + phase * turn), 16) };
+      }
+      case 'rainbow': {
+        const hue = ((travel * 65 + theta * 180 / Math.PI - time * 90) % 360 + 360) % 360;
+        return { brightness: 1, color: `hsl(${hue}, 100%, 60%)` };
+      }
+      default:
+        return { brightness: 1 };
+    }
+  }
+
+  drawStickman(groundY, radius, matrix, scale) {
+    const height = this.stickmanHeightCm / 300;
+    const center = radius + height * 0.4;
+    // Keep the figure beside the cylinder as it spins, on the same ground plane.
+    const project = (x, y) => this.project(center + x * height, groundY - y * height, 0, matrix, scale);
+    ctx.strokeStyle = '#f0f0f0';
+    ctx.lineWidth = Math.max(1, height * scale * 0.025);
+    ctx.lineCap = 'round';
+    ctx.lineJoin = 'round';
+    ctx.beginPath();
+    for (let i = 0; i <= 48; i++) {
+      const angle = i / 48 * Math.PI * 2;
+      const p = project(0.09 * Math.cos(angle), 0.91 + 0.09 * Math.sin(angle));
+      if (i === 0) ctx.moveTo(p.x, p.y);
+      else ctx.lineTo(p.x, p.y);
+    }
+    ctx.stroke();
+    for (const limb of [
+      [[0, 0.82], [0, 0.43]],
+      [[-0.2, 0.48], [0, 0.72], [0.2, 0.48]],
+      [[-0.17, 0], [0, 0.43], [0.17, 0]],
+    ]) {
+      ctx.beginPath();
+      limb.forEach(([x, y], index) => {
+        const p = project(x, y);
+        if (index === 0) ctx.moveTo(p.x, p.y);
+        else ctx.lineTo(p.x, p.y);
+      });
+      ctx.stroke();
+    }
+  }
+}
+
+shapeRegistry.register('ball of life', BallOfLife);

docs/serve.py

@@ -0,0 +1,41 @@
+"""Serve the animation app with direct preset URLs (no dependencies)."""
+
+import argparse
+from http.server import SimpleHTTPRequestHandler, ThreadingHTTPServer
+from pathlib import Path
+from urllib.parse import urlsplit
+
+ROOT = Path(__file__).resolve().parent
+
+
+class Handler(SimpleHTTPRequestHandler):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, directory=str(ROOT), **kwargs)
+
+    def send_head(self):
+        url = urlsplit(self.path)
+        target = Path(self.translate_path(url.path))
+        # Only single-segment routes are preset names; missing assets stay 404s.
+        name = url.path.strip('/')
+        if name and '/' not in name and not target.exists():
+            if url.path.endswith('/'):
+                self.send_response(307)
+                self.send_header('Location', url.path.rstrip('/') + ('?' + url.query if url.query else ''))
+                self.end_headers()
+                return None
+            self.path = '/index.html'
+        return super().send_head()
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument('--port', type=int, default=5501)
+    args = parser.parse_args()
+    server = ThreadingHTTPServer(('localhost', args.port), Handler)
+    print(f'Animation app: http://localhost:{args.port}', flush=True)
+    try:
+        server.serve_forever()
+    except KeyboardInterrupt:
+        pass
+    finally:
+        server.server_close()