109 lines
3.4 KiB
JavaScript
109 lines
3.4 KiB
JavaScript
// Parameter bar display
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// Shows output parameters as horizontal bars, draggable in examples mode
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const PARAM_NAMES = ['Flow', 'Scale', 'Speed', 'Hue', 'Spread', 'Size', 'Trail', 'Turb', 'Attract', 'Radius', 'DispRate', 'DispAmt', 'Lifetime', 'Respawn'];
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const PARAM_COLORS = ['#00ff88', '#00ccff', '#ff6600', '#ff00cc', '#ffcc00', '#88ff00', '#0088ff', '#ff3366', '#9bff5f', '#59d3ff', '#ff8f3f', '#a0b7ff', '#f4ff7a', '#ffa8db'];
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export class ParamDisplay {
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constructor(container, numParams = 14) {
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this.container = container;
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this.numParams = numParams;
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this.values = new Array(numParams).fill(0.5);
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this.draggable = false;
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this.onChange = null;
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this.activeBar = -1;
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this.build();
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}
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build() {
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this.container.innerHTML = '';
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this.bars = [];
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for (let i = 0; i < this.numParams; i++) {
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const row = document.createElement('div');
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row.className = 'param-row';
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const label = document.createElement('span');
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label.className = 'param-label';
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label.textContent = PARAM_NAMES[i] || `p${i}`;
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const track = document.createElement('div');
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track.className = 'param-track';
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track.dataset.index = i;
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const fill = document.createElement('div');
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fill.className = 'param-fill';
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fill.style.background = PARAM_COLORS[i] || '#888';
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fill.style.width = '50%';
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const val = document.createElement('span');
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val.className = 'param-value';
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val.textContent = '0.50';
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track.appendChild(fill);
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row.appendChild(label);
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row.appendChild(track);
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row.appendChild(val);
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this.container.appendChild(row);
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this.bars.push({ fill, val, track });
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}
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// Touch/mouse drag events on the container
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const onStart = (e) => {
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if (!this.draggable) return;
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const target = e.target.closest('.param-track');
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if (!target) return;
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e.preventDefault();
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this.activeBar = parseInt(target.dataset.index);
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this._updateFromEvent(e);
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};
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const onMove = (e) => {
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if (this.activeBar < 0 || !this.draggable) return;
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e.preventDefault();
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this._updateFromEvent(e);
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};
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const onEnd = () => {
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this.activeBar = -1;
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};
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this.container.addEventListener('mousedown', onStart);
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window.addEventListener('mousemove', onMove);
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window.addEventListener('mouseup', onEnd);
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this.container.addEventListener('touchstart', onStart, { passive: false });
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this.container.addEventListener('touchmove', onMove, { passive: false });
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this.container.addEventListener('touchend', onEnd);
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}
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_updateFromEvent(e) {
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const i = this.activeBar;
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if (i < 0) return;
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const track = this.bars[i].track;
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const rect = track.getBoundingClientRect();
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const clientX = e.touches ? e.touches[0].clientX : e.clientX;
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const value = Math.max(0, Math.min(1, (clientX - rect.left) / rect.width));
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this.values[i] = value;
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this._renderBar(i);
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if (this.onChange) this.onChange(i, value, this.values);
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}
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update(values) {
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for (let i = 0; i < this.numParams && i < values.length; i++) {
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this.values[i] = values[i];
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this._renderBar(i);
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}
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}
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_renderBar(i) {
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const v = this.values[i];
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this.bars[i].fill.style.width = (v * 100) + '%';
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this.bars[i].val.textContent = v.toFixed(2);
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}
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setDraggable(draggable) {
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this.draggable = draggable;
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this.container.classList.toggle('draggable', draggable);
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}
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}
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