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Scale fire flames with SVG transform anchored at base, floor at 1200W

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Replace clip-rect height manipulation with translate-scale-translate SVG
transform on fire-group, pivoting at the fixed base coordinate y=248.
Eliminates base-hopping caused by fill-box bounding-box drift from
individual flame flicker animations. Clip rect is now static (guards
against flicker overshoot above the pot bottom). Minimum visible flame
size floored at the scale corresponding to 1200W.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JLR2133M2PyjiYq584i2G7
This commit is contained in:
jens
2026-06-27 10:32:47 +02:00
co-authored by Claude Sonnet 4.6
parent eef391e048
commit 82acc2d149
2 changed files with 7 additions and 13 deletions
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web/app.js
+6 -12
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@@ -295,23 +295,17 @@ function updateStirrerVisualization() {
// --- Fire visualization ---
function updateFireVisualization() {
const g = document.getElementById('fire-group');
const clipRect = document.getElementById('fire-clip-rect');
const g = document.getElementById('fire-group');
if (!g) return;
const fireBase = 248; // y of flame base (all paths end here)
const fireTip = 177; // y of tallest flame tip
const fireH = fireBase - fireTip; // 71px total flame height
if (heaterPowerSoll <= 0) {
g.style.opacity = '0';
clipRect.setAttribute('height', '0');
g.removeAttribute('transform');
} else {
const intensity = Math.min(1, heaterPowerSoll / heaterMaxPower);
// Always show the lower 35% (base), scale upper 65% with intensity
const visibleH = (0.35 + 0.65 * intensity) * fireH;
const topBuffer = 20; // headroom for flicker scaleY overshoot (~12% of height)
clipRect.setAttribute('y', (fireBase - visibleH - topBuffer).toFixed(1));
clipRect.setAttribute('height', (visibleH + topBuffer + 2).toFixed(1));
g.style.opacity = String((0.6 + 0.4 * intensity).toFixed(2));
const minScale = 1200 / heaterMaxPower;
const scale = Math.max(minScale, intensity);
g.style.opacity = '1';
g.setAttribute('transform', `translate(0,248) scale(1,${scale.toFixed(3)}) translate(0,-248)`);
}
}