simplequad/examples/hello-world/index.html at master · rcasto/simplequad · GitHub

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<!doctype html>
<html lang="en" data-theme="dark">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>simplequad — Query Explorer</title>
    <meta name="description" content="Query a mixed-shape scene by moving the cursor. Hit shapes light up with MTV arrows. Toggle the tree overlay to see live spatial partitioning." />
    <meta property="og:type" content="website" />
    <meta property="og:title" content="simplequad — Query Explorer" />
    <meta property="og:description" content="Query a mixed-shape scene by moving the cursor. Hit shapes light up with MTV arrows. Toggle the tree overlay to see live spatial partitioning." />
    <meta property="og:image" content="https://rcasto.github.io/simplequad/simplequad.gif" />
    <meta name="twitter:card" content="summary_large_image" />
    <meta name="twitter:title" content="simplequad — Query Explorer" />
    <meta name="twitter:description" content="Query a mixed-shape scene by moving the cursor. Hit shapes light up with MTV arrows. Toggle the tree overlay to see live spatial partitioning." />
    <meta name="twitter:image" content="https://rcasto.github.io/simplequad/simplequad.gif" />
    <link rel="stylesheet" href="../engine.css" />
    <style>
      :root {
        --bg: #080814;
        --border: #1a1a3e;
        --text: #eee;
        --muted: #666;
        --muted2: #3a3a5a;
        --accent: #7c4dff;
        --btn-bg: #10101e;
        --btn-border: #2a2a4a;
        --btn-text: #666;
      }
      [data-theme="light"] {
        --bg: #f0f0f8;
        --border: #c8c8e0;
        --text: #1a1a2e;
        --muted: #778;
        --muted2: #aaa;
        --accent: #5c2ddf;
        --btn-bg: #eeeef8;
        --btn-border: #c0c0d8;
        --btn-text: #555;
      }
      canvas {
        cursor: none;
        aspect-ratio: 800 / 500;
        touch-action: none;
      }
      #hud { gap: 20px; }
      button {
        background: var(--btn-bg);
        border: 1px solid var(--btn-border);
        color: var(--btn-text);
        padding: 3px 10px;
        font-family: monospace;
        font-size: 12px;
        border-radius: 4px;
        cursor: pointer;
        transition: border-color 0.15s, color 0.15s;
      }
      button.on {
        border-color: var(--accent);
        color: var(--accent);
      }
      .legend {
        display: flex;
        gap: 14px;
        align-items: center;
      }
      .legend-item {
        display: flex;
        align-items: center;
        gap: 5px;
        font-size: 12px;
        color: var(--muted);
      }
      .swatch-box {
        width: 11px;
        height: 11px;
        border: 1.5px solid #4488ff;
      }
      .swatch-circle {
        width: 11px;
        height: 11px;
        border: 1.5px solid #44ccaa;
        border-radius: 50%;
      }
      .swatch-point {
        width: 10px;
        height: 10px;
        background: #ff8844;
        transform: rotate(45deg);
      }
    </style>
    <script>(function(){var t=localStorage.getItem('sq-theme');if(t)document.documentElement.setAttribute('data-theme',t);})()</script>
  </head>
  <body>
    <canvas id="c" width="800" height="500"></canvas>
    <div id="hud">
      <div class="legend">
        <div class="legend-item"><div class="swatch-box"></div>BoundingBox</div>
        <div class="legend-item"><div class="swatch-circle"></div>Circle</div>
        <div class="legend-item"><div class="swatch-point"></div>Point</div>
      </div>
      <span>hits: <b id="hits">0</b></span>
      <span>fps: <b id="fps">0</b></span>
      <button id="btn-tree">tree overlay</button>
      <button id="btn-shape">query: box</button>
      <button id="btn-theme" title="toggle theme">☀</button>
    </div>
    <div id="controls">move cursor over shapes · yellow arrows show MTV · points have no depth (MTV n/a)</div>

    <script src="../../dist/simplequad.umd.js"></script>
    <script src="../engine.js"></script>
    <script>
      const canvas = document.getElementById("c");
      const ctx = canvas.getContext("2d");
      const W = 800, H = 500;

      const toCanvas = SQEngine.makeToCanvas(canvas, W, H);
      const fpsTick  = SQEngine.createFpsTracker(document.getElementById("fps"), canvas);
      SQEngine.initTheme();

      // ── shapes ────────────────────────────────────────────────────────────
      const shapes = [
        { x: 55,  y: 95,  width: 140, height: 95  },
        { x: 585, y: 60,  width: 130, height: 120 },
        { x: 300, y: 310, width: 160, height: 100 },
        { x: 192, y: 318, r: 70 },
        { x: 512, y: 282, r: 58 },
        { x: 672, y: 402, r: 46 },
        { x: 400, y: 148 },
        { x: 148, y: 435 },
      ];

      function isBox(s)    { return s.width !== undefined; }
      function isCircle(s) { return s.r    !== undefined; }

      function center(s) {
        if (isBox(s)) return { x: s.x + s.width / 2, y: s.y + s.height / 2 };
        return { x: s.x, y: s.y };
      }

      const tree = SimpleQuad.createQuadTree({ x: 0, y: 0, width: W, height: H });
      for (const s of shapes) tree.add(s);

      // ── state ─────────────────────────────────────────────────────────────
      let mx = W / 2, my = H / 2;
      let showTree    = false;
      let circleQuery = false;
      const QW = 110, QR = 62;

      // ── input ─────────────────────────────────────────────────────────────
      canvas.addEventListener("mousemove", e => {
        const p = toCanvas(e.clientX, e.clientY);
        mx = p.x; my = p.y;
      });
      canvas.addEventListener("touchstart", e => {
        e.preventDefault();
        const p = toCanvas(e.touches[0].clientX, e.touches[0].clientY);
        mx = p.x; my = p.y;
      }, { passive: false });
      canvas.addEventListener("touchmove", e => {
        e.preventDefault();
        const p = toCanvas(e.touches[0].clientX, e.touches[0].clientY);
        mx = p.x; my = p.y;
      }, { passive: false });

      document.getElementById("btn-tree").addEventListener("click", e => {
        showTree = !showTree;
        e.currentTarget.classList.toggle("on", showTree);
      });
      document.getElementById("btn-shape").addEventListener("click", e => {
        circleQuery = !circleQuery;
        e.currentTarget.textContent = circleQuery ? "query: circle" : "query: box";
      });

      // ── colors ────────────────────────────────────────────────────────────
      const C_BOX    = "#4488ff";
      const C_CIRCLE = "#44ccaa";
      const C_POINT  = "#ff8844";
      const C_HIT    = "#ffffff";
      const C_MTV    = "#ffdd00";

      // ── draw helpers ──────────────────────────────────────────────────────
      function drawShape(s, color, hit) {
        ctx.lineWidth = hit ? 2.5 : 1.5;
        ctx.strokeStyle = color;
        ctx.fillStyle = color;

        if (isBox(s)) {
          ctx.globalAlpha = hit ? 0.22 : 0.08;
          ctx.fillRect(s.x, s.y, s.width, s.height);
          ctx.globalAlpha = 1;
          ctx.strokeRect(s.x, s.y, s.width, s.height);
        } else if (isCircle(s)) {
          ctx.beginPath();
          ctx.arc(s.x, s.y, s.r, 0, Math.PI * 2);
          ctx.globalAlpha = hit ? 0.22 : 0.08;
          ctx.fill();
          ctx.globalAlpha = 1;
          ctx.stroke();
        } else {
          const sz = hit ? 9 : 7;
          ctx.beginPath();
          ctx.moveTo(s.x,      s.y - sz);
          ctx.lineTo(s.x + sz, s.y);
          ctx.lineTo(s.x,      s.y + sz);
          ctx.lineTo(s.x - sz, s.y);
          ctx.closePath();
          ctx.fill();
        }
        ctx.globalAlpha = 1;
      }

      function drawLabel(s, color, hit) {
        const label = isBox(s) ? "BoundingBox" : isCircle(s) ? "Circle" : "Point";
        const c = center(s);
        const yOff = isBox(s) ? s.height / 2 + 15
                   : isCircle(s) ? s.r + 15
                   : 18;
        ctx.fillStyle = hit ? "rgba(255,255,255,0.85)" : color + "66";
        ctx.font = "11px monospace";
        ctx.textAlign = "center";
        ctx.fillText(label, c.x, c.y + yOff);
        // Points don't have geometric depth, so no MTV applies
        if (!isBox(s) && !isCircle(s) && hit) {
          ctx.fillStyle = "rgba(255,221,0,0.6)";
          ctx.fillText("mtv: n/a", c.x, c.y + yOff + 14);
        }
      }

      function drawArrow(cx, cy, dx, dy, len) {
        const ex = cx + dx * len;
        const ey = cy + dy * len;
        ctx.strokeStyle = C_MTV;
        ctx.fillStyle   = C_MTV;
        ctx.lineWidth   = 2;
        ctx.beginPath();
        ctx.moveTo(cx, cy);
        ctx.lineTo(ex, ey);
        ctx.stroke();
        const a = Math.atan2(dy, dx);
        const hw = 9;
        ctx.beginPath();
        ctx.moveTo(ex, ey);
        ctx.lineTo(ex - hw * Math.cos(a - 0.42), ey - hw * Math.sin(a - 0.42));
        ctx.lineTo(ex - hw * Math.cos(a + 0.42), ey - hw * Math.sin(a + 0.42));
        ctx.closePath();
        ctx.fill();
      }

      function drawMtvLabel(cx, cy, dx, dy, len, mag) {
        const lx = cx + dx * (len * 0.55);
        const ly = cy + dy * (len * 0.55) - 8;
        ctx.fillStyle = C_MTV + "cc";
        ctx.font = "10px monospace";
        ctx.textAlign = "center";
        ctx.fillText(mag.toFixed(1) + "px", lx, ly);
      }

      function drawTreeNode(node) {
        ctx.strokeRect(node.bounds.x, node.bounds.y, node.bounds.width, node.bounds.height);
        for (const q of node.quadrants) drawTreeNode(q);
      }

      // ── frame loop ────────────────────────────────────────────────────────
      function frame(ts) {
        fpsTick(ts);

        ctx.clearRect(0, 0, W, H);
        ctx.fillStyle = "#080814";
        ctx.fillRect(0, 0, W, H);

        if (showTree) {
          ctx.strokeStyle = "rgba(124,77,255,0.2)";
          ctx.lineWidth = 0.5;
          drawTreeNode(tree);
        }

        const qb = circleQuery
          ? { x: mx, y: my, r: QR }
          : { x: mx - QW / 2, y: my - QW / 2, width: QW, height: QW };

        const hits    = tree.query(qb);
        const hitSet  = new Set(hits.map(h => h.object));
        const hitMtv  = new Map(hits.map(h => [h.object, h.mtv]));

        for (const s of shapes) {
          if (hitSet.has(s)) continue;
          const base = isBox(s) ? C_BOX : isCircle(s) ? C_CIRCLE : C_POINT;
          drawShape(s, base, false);
        }
        for (const s of shapes) {
          if (!hitSet.has(s)) continue;
          drawShape(s, C_HIT, true);
        }

        // MTV arrows — only for shapes that have geometric extent (box, circle)
        for (const s of shapes) {
          if (!hitSet.has(s)) continue;
          if (!isBox(s) && !isCircle(s)) continue;
          const mtv = hitMtv.get(s);
          const c   = center(s);
          const len = Math.max(40, mtv.magnitude * 2.5);
          drawArrow(c.x, c.y, mtv.direction.x, mtv.direction.y, len);
          drawMtvLabel(c.x, c.y, mtv.direction.x, mtv.direction.y, len, mtv.magnitude);
        }

        for (const s of shapes) {
          const base = isBox(s) ? C_BOX : isCircle(s) ? C_CIRCLE : C_POINT;
          drawLabel(s, base, hitSet.has(s));
        }

        // query window
        ctx.save();
        ctx.setLineDash([6, 4]);
        ctx.lineWidth   = 1.5;
        ctx.strokeStyle = "rgba(255,255,255,0.5)";
        ctx.fillStyle   = "rgba(255,255,255,0.03)";
        if (circleQuery) {
          ctx.beginPath();
          ctx.arc(qb.x, qb.y, qb.r, 0, Math.PI * 2);
          ctx.fill();
          ctx.stroke();
        } else {
          ctx.fillRect(qb.x, qb.y, qb.width, qb.height);
          ctx.strokeRect(qb.x, qb.y, qb.width, qb.height);
        }
        ctx.restore();

        // cursor dot
        ctx.fillStyle = "rgba(255,255,255,0.75)";
        ctx.beginPath();
        ctx.arc(mx, my, 2.5, 0, Math.PI * 2);
        ctx.fill();

        document.getElementById("hits").textContent = hits.length;

        requestAnimationFrame(frame);
      }

      requestAnimationFrame(frame);
    </script>
  </body>
</html>