348 lines
11 KiB
JavaScript
348 lines
11 KiB
JavaScript
(() => {
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const LABELS = ['TL', 'TR', 'BR', 'BL'];
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const defaultState = {
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fieldW: 1920, fieldH: 1080,
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widgetW: 400, widgetH: 300,
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corners: [
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{ x: 300, y: 200 },
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{ x: 1620, y: 150 },
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{ x: 1580, y: 920 },
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{ x: 340, y: 950 }
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]
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};
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const state = {
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fieldW: 1920, fieldH: 1080,
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widgetW: 400, widgetH: 300,
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corners: [
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{ x: 300, y: 200 },
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{ x: 1620, y: 150 },
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{ x: 1580, y: 920 },
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{ x: 340, y: 950 }
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]
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};
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const $ = id => document.getElementById(id);
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const svg = $('svg');
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// ===== Homography math =====
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function computeHomography() {
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const w = state.widgetW, h = state.widgetH;
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if (w <= 0 || h <= 0) return null;
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const [p0, p1, p2, p3] = state.corners;
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const a11 = p2.x - p1.x, a12 = p2.x - p3.x;
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const b1 = p1.x + p3.x - p0.x - p2.x;
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const a21 = p2.y - p1.y, a22 = p2.y - p3.y;
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const b2 = p1.y + p3.y - p0.y - p2.y;
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const D = a11 * a22 - a12 * a21;
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if (Math.abs(D) < 1e-10) return null;
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const A = (b1 * a22 - b2 * a12) / D;
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const B = (a11 * b2 - a21 * b1) / D;
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return {
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h00: (p1.x * (A + 1) - p0.x) / w,
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h10: (p1.y * (A + 1) - p0.y) / w,
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h01: (p3.x * (B + 1) - p0.x) / h,
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h11: (p3.y * (B + 1) - p0.y) / h,
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h02: p0.x,
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h12: p0.y,
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h20: A / w,
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h21: B / h,
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h22: 1
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};
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}
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function toMatrix3dCSS(H) {
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if (!H) return '/* вырожденная конфигурация */';
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const n = v => parseFloat(v.toFixed(8));
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return [
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'transform-origin: 0 0;',
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'transform: matrix3d(',
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` ${n(H.h00)}, ${n(H.h10)}, 0, ${n(H.h20)},`,
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` ${n(H.h01)}, ${n(H.h11)}, 0, ${n(H.h21)},`,
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` 0, 0, 1, 0,`,
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` ${n(H.h02)}, ${n(H.h12)}, 0, ${n(H.h22)}`,
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');'
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].join('\n');
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}
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// ===== SVG rendering =====
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function gridInterval(maxDim) {
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if (maxDim <= 500) return 50;
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if (maxDim <= 1000) return 100;
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if (maxDim <= 2000) return 200;
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return 500;
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}
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function renderSVG() {
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svg.setAttribute('viewBox', `0 0 ${state.fieldW} ${state.fieldH}`);
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svg.innerHTML = '';
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const ns = 'http://www.w3.org/2000/svg';
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const rect = document.createElementNS(ns, 'rect');
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rect.setAttribute('width', state.fieldW);
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rect.setAttribute('height', state.fieldH);
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rect.setAttribute('fill', '#0a0e14');
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svg.appendChild(rect);
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const step = gridInterval(Math.max(state.fieldW, state.fieldH));
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const gridG = document.createElementNS(ns, 'g');
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for (let x = step; x < state.fieldW; x += step) {
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const line = document.createElementNS(ns, 'line');
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line.setAttribute('x1', x); line.setAttribute('y1', 0);
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line.setAttribute('x2', x); line.setAttribute('y2', state.fieldH);
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line.setAttribute('stroke', 'rgba(255,255,255,0.06)');
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line.setAttribute('stroke-width', 1);
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gridG.appendChild(line);
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}
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for (let y = step; y < state.fieldH; y += step) {
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const line = document.createElementNS(ns, 'line');
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line.setAttribute('x1', 0); line.setAttribute('y1', y);
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line.setAttribute('x2', state.fieldW); line.setAttribute('y2', y);
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line.setAttribute('stroke', 'rgba(255,255,255,0.06)');
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line.setAttribute('stroke-width', 1);
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gridG.appendChild(line);
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}
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svg.appendChild(gridG);
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const widgetRect = document.createElementNS(ns, 'rect');
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widgetRect.setAttribute('x', 0);
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widgetRect.setAttribute('y', 0);
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widgetRect.setAttribute('width', state.widgetW);
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widgetRect.setAttribute('height', state.widgetH);
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widgetRect.setAttribute('fill', 'none');
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widgetRect.setAttribute('stroke', 'rgba(88,166,255,0.2)');
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widgetRect.setAttribute('stroke-width', 2);
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widgetRect.setAttribute('stroke-dasharray', '12,8');
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svg.appendChild(widgetRect);
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const poly = document.createElementNS(ns, 'polygon');
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const pts = state.corners.map(c => `${c.x},${c.y}`).join(' ');
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poly.setAttribute('points', pts);
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poly.setAttribute('fill', 'rgba(88,166,255,0.1)');
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poly.setAttribute('stroke', '#58a6ff');
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poly.setAttribute('stroke-width', 3);
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poly.setAttribute('stroke-linejoin', 'round');
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svg.appendChild(poly);
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state.corners.forEach((c, i) => {
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const g = document.createElementNS(ns, 'g');
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const circle = document.createElementNS(ns, 'circle');
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circle.setAttribute('cx', c.x);
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circle.setAttribute('cy', c.y);
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circle.setAttribute('r', 10);
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circle.setAttribute('fill', '#58a6ff');
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circle.setAttribute('stroke', '#ffffff');
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circle.setAttribute('stroke-width', 2.5);
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circle.setAttribute('class', 'corner-circle');
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circle.dataset.index = i;
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g.appendChild(circle);
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const label = document.createElementNS(ns, 'text');
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const lx = c.x + (i === 0 || i === 3 ? -30 : 20);
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const ly = c.y + (i < 2 ? -18 : 28);
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label.setAttribute('x', lx);
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label.setAttribute('y', ly);
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label.setAttribute('class', 'corner-label');
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label.setAttribute('text-anchor', 'middle');
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label.textContent = LABELS[i];
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g.appendChild(label);
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const coord = document.createElementNS(ns, 'text');
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coord.setAttribute('x', lx);
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coord.setAttribute('y', ly + 18);
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coord.setAttribute('class', 'corner-coord');
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coord.setAttribute('text-anchor', 'middle');
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coord.textContent = `(${c.x}, ${c.y})`;
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g.appendChild(coord);
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svg.appendChild(g);
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});
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}
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// ===== Drag handling =====
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let dragIndex = -1;
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function svgPoint(clientX, clientY) {
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const pt = svg.createSVGPoint();
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pt.x = clientX;
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pt.y = clientY;
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return pt.matrixTransform(svg.getScreenCTM().inverse());
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}
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function onPointerDown(e) {
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const target = e.target.closest('.corner-circle');
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if (!target) return;
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e.preventDefault();
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dragIndex = parseInt(target.dataset.index);
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target.classList.add('dragging');
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document.addEventListener('mousemove', onPointerMove);
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document.addEventListener('mouseup', onPointerUp);
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document.addEventListener('touchmove', onPointerMove, { passive: false });
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document.addEventListener('touchend', onPointerUp);
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}
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function onPointerMove(e) {
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if (dragIndex < 0) return;
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e.preventDefault();
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const cx = e.touches ? e.touches[0].clientX : e.clientX;
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const cy = e.touches ? e.touches[0].clientY : e.clientY;
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const pt = svgPoint(cx, cy);
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state.corners[dragIndex].x = Math.round(Math.max(0, Math.min(state.fieldW, pt.x)));
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state.corners[dragIndex].y = Math.round(Math.max(0, Math.min(state.fieldH, pt.y)));
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updateAll();
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}
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function onPointerUp() {
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dragIndex = -1;
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document.querySelectorAll('.corner-circle.dragging').forEach(el => el.classList.remove('dragging'));
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document.removeEventListener('mousemove', onPointerMove);
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document.removeEventListener('mouseup', onPointerUp);
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document.removeEventListener('touchmove', onPointerMove);
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document.removeEventListener('touchend', onPointerUp);
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}
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svg.addEventListener('mousedown', onPointerDown);
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svg.addEventListener('touchstart', onPointerDown, { passive: false });
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// ===== Live preview =====
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function updateLivePreview() {
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const container = $('fieldContainer');
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const cw = container.clientWidth;
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if (cw <= 0) return;
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const scale = cw / state.fieldW;
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const field = $('field');
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field.style.width = state.fieldW + 'px';
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field.style.height = state.fieldH + 'px';
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field.style.transform = `scale(${scale})`;
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container.style.height = (state.fieldH * scale) + 'px';
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const widget = $('widget');
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widget.style.width = state.widgetW + 'px';
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widget.style.height = state.widgetH + 'px';
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const H = computeHomography();
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if (H) {
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const n = v => parseFloat(v.toFixed(6));
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widget.style.transform = `matrix3d(${n(H.h00)},${n(H.h10)},0,${n(H.h20)},${n(H.h01)},${n(H.h11)},0,${n(H.h21)},0,0,1,0,${n(H.h02)},${n(H.h12)},0,${n(H.h22)})`;
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widget.style.opacity = '1';
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} else {
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widget.style.transform = 'none';
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widget.style.opacity = '0.3';
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}
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}
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// ===== Corner inputs =====
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function buildCornerInputs() {
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const container = $('cornerInputs');
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container.innerHTML = '';
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LABELS.forEach((label, i) => {
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const row = document.createElement('div');
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row.className = 'corner-input-row';
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row.innerHTML = `
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<span class="label">${label}</span>
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<label><span>x</span><input id="c${i}x" type="number" value="${state.corners[i].x}"></label>
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<label><span>y</span><input id="c${i}y" type="number" value="${state.corners[i].y}"></label>
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`;
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container.appendChild(row);
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});
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}
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function syncCornerInputs() {
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state.corners.forEach((c, i) => {
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const xi = $(`c${i}x`);
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const yi = $(`c${i}y`);
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if (document.activeElement !== xi) xi.value = c.x;
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if (document.activeElement !== yi) yi.value = c.y;
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});
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}
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function readCornerInputs() {
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state.corners.forEach((c, i) => {
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const x = parseInt($(`c${i}x`).value);
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const y = parseInt($(`c${i}y`).value);
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if (!isNaN(x)) c.x = x;
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if (!isNaN(y)) c.y = y;
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});
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}
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// ===== Update all =====
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function updateAll() {
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renderSVG();
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updateLivePreview();
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syncCornerInputs();
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updateCSSOutput();
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}
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function updateCSSOutput() {
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const H = computeHomography();
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$('cssOutput').value = toMatrix3dCSS(H);
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}
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// ===== Input events =====
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$('inpFieldW').addEventListener('input', () => {
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const v = parseInt($('inpFieldW').value);
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if (v > 0) { state.fieldW = v; updateAll(); }
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});
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$('inpFieldH').addEventListener('input', () => {
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const v = parseInt($('inpFieldH').value);
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if (v > 0) { state.fieldH = v; updateAll(); }
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});
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$('inpWidgetW').addEventListener('input', () => {
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const v = parseInt($('inpWidgetW').value);
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if (v > 0) { state.widgetW = v; updateAll(); }
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});
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$('inpWidgetH').addEventListener('input', () => {
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const v = parseInt($('inpWidgetH').value);
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if (v > 0) { state.widgetH = v; updateAll(); }
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});
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document.addEventListener('input', (e) => {
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if (e.target.id && /^c\d[xy]$/.test(e.target.id)) {
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readCornerInputs();
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updateAll();
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}
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});
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// ===== Copy =====
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$('copyBtn').addEventListener('click', () => {
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const text = $('cssOutput').value;
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navigator.clipboard.writeText(text).then(() => {
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const btn = $('copyBtn');
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const orig = btn.textContent;
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btn.textContent = 'Скопировано!';
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setTimeout(() => btn.textContent = orig, 1500);
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});
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});
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// ===== Reset =====
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$('resetBtn').addEventListener('click', () => {
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state.fieldW = defaultState.fieldW;
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state.fieldH = defaultState.fieldH;
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state.widgetW = defaultState.widgetW;
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state.widgetH = defaultState.widgetH;
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defaultState.corners.forEach((c, i) => {
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state.corners[i] = { x: c.x, y: c.y };
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});
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$('inpFieldW').value = state.fieldW;
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$('inpFieldH').value = state.fieldH;
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$('inpWidgetW').value = state.widgetW;
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$('inpWidgetH').value = state.widgetH;
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buildCornerInputs();
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updateAll();
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});
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// ===== Resize =====
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window.addEventListener('resize', updateLivePreview);
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// ===== Init =====
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buildCornerInputs();
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updateAll();
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})(); |