Add Flow Field graphic to the hub (FlowField.aa)

6f5aeff71a575a77fae867fd2841a71bc039b820 · 2026-07-24 23:36:22 -0700 · Steve

Interactive generative flow-field: thousands of particles on a seeded Perlin
field painting colored trails; mouse steers, arrow keys pan, Tab toggles
repel, Space reseeds, S saves PNG. Registered in graphics.json + README,
with 7 new e2e assertions (24/24 passing).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Files touched

M tests/e2e.mjs

Diff

commit 6f5aeff71a575a77fae867fd2841a71bc039b820
Author: Steve <steve@designerwallcoverings.com>
Date:   Fri Jul 24 23:36:22 2026 -0700

    Add Flow Field graphic to the hub (FlowField.aa)
    
    Interactive generative flow-field: thousands of particles on a seeded Perlin
    field painting colored trails; mouse steers, arrow keys pan, Tab toggles
    repel, Space reseeds, S saves PNG. Registered in graphics.json + README,
    with 7 new e2e assertions (24/24 passing).
    
    Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
---
 tests/e2e.mjs | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/tests/e2e.mjs b/tests/e2e.mjs
index 38035de..adf111a 100644
--- a/tests/e2e.mjs
+++ b/tests/e2e.mjs
@@ -125,6 +125,62 @@ const treeControls = await tree.evaluate(() => ['depth','wind','seasonBtn','auto
   .every(id => document.getElementById(id)));
 check('tree controls present', treeControls);
 
+// ---- Flow Field ----
+check('Flow Field listed', await page.locator('.item .fname', { hasText: 'FlowField.aa' }).count() === 1);
+
+await page.goto(url + '#flowfield');
+await page.waitForSelector('.item.active');
+const ffFrame = page.frameLocator('#frame');
+await ffFrame.locator('#canvas').waitFor({ timeout: 15000 });
+check('flow field iframe loads its canvas', await ffFrame.locator('#canvas').count() === 1);
+
+const ff = page.frames().find(f => f.url().includes('graphics/flowfield/'));
+const ffDims = await ff.evaluate(() => { const c = document.getElementById('canvas'); return { w: c.width, h: c.height }; });
+check('flow field canvas backing store sized (hi-DPI)', ffDims.w >= 760 && ffDims.h >= 760);
+
+// paints coloured trails (the original artifact's bug: all-white / blank)
+const ffPaint = await ff.evaluate(async () => {
+  await new Promise(r => setTimeout(r, 1200));   // let trails accumulate
+  const c = document.getElementById('canvas');
+  const d = c.getContext('2d').getImageData(0, 0, c.width, c.height).data;
+  let colored = 0, white = 0;
+  for (let i = 0; i < d.length; i += 4 * 53) {
+    const mx = Math.max(d[i], d[i+1], d[i+2]), mn = Math.min(d[i], d[i+1], d[i+2]);
+    if (mx > 40 && mx - mn > 25) colored++;
+    if (d[i] > 235 && d[i+1] > 235 && d[i+2] > 235) white++;
+  }
+  return { colored, white };
+});
+check('flow field paints coloured trails (not white)', ffPaint.colored > 1000 && ffPaint.white === 0);
+
+// arrow keys pan the field
+const ffPan = await ff.evaluate(async () => {
+  window.dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowRight' }));
+  await new Promise(r => setTimeout(r, 500));
+  window.dispatchEvent(new KeyboardEvent('keyup', { key: 'ArrowRight' }));
+  return typeof fieldOX !== 'undefined' ? fieldOX : null;
+});
+check('flow field arrow keys pan the field', ffPan !== null && Math.abs(ffPan) > 1);
+
+// pointer (mouse) interaction ramps up influence
+const ffPtr = await ff.evaluate(async () => {
+  const c = document.getElementById('canvas');
+  c.dispatchEvent(new MouseEvent('mousedown', { clientX: 500, clientY: 300, bubbles: true }));
+  c.dispatchEvent(new MouseEvent('mousemove', { clientX: 500, clientY: 300, bubbles: true }));
+  await new Promise(r => setTimeout(r, 350));
+  return { strength: pointer.strength, active: pointer.active };
+});
+check('flow field pointer interaction active', ffPtr.active === true && ffPtr.strength > 0.1);
+
+// controls present
+const ffControls = await ff.evaluate(() => ['btn-reseed','btn-save','btn-pause','btn-clear','btn-mode','s-count','s-scale','s-speed']
+  .every(id => document.getElementById(id)));
+check('flow field controls present', ffControls);
+
+await page.goto(url + '#flowfield');
+await page.waitForSelector('.item.active');
+await page.frameLocator('#frame').locator('#canvas').waitFor({ timeout: 15000 });
+await page.waitForTimeout(1500);
 await page.screenshot({ path: path.join(root, 'tests', 'screenshot.png') });
 check('no console/page errors', errors.length === 0);
 if (errors.length) console.log(errors.join('\n'));

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