mathbox/examples/test/pointsizes.html at master · unconed/mathbox · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>MathBox - Point Sizes</title>
    <script
      type="text/javascript"
      src="https://cdn.jsdelivr.net/npm/three@0.137.0/build/three.min.js"
    ></script>
    <script
      type="text/javascript"
      src="https://cdn.jsdelivr.net/npm/three@0.137.0/examples/js/controls/OrbitControls.js"
    ></script>
    <!--
      - a minified version mathbox.min.js is also available;
      - recommend using a specific version (not @latest) in public sites
    -->
    <script
      type="text/javascript"
      src="https://cdn.jsdelivr.net/npm/mathbox@latest/build/bundle/mathbox.js"
    ></script>
    <link
      rel="stylesheet"
      href="https://cdn.jsdelivr.net/npm/mathbox@latest/build/mathbox.css"
    />
    <meta name="viewport" content="initial-scale=1, maximum-scale=1" />
  </head>
  <body>
    <script>
      mathbox = MathBox.mathBox({
        plugins: ["core", "controls", "cursor", "stats"],
        controls: {
          klass: THREE.OrbitControls,
        },
        camera: {
          fov: 60,
        },
      });
      three = mathbox.three;
      three.camera.position.set(-3.5, 1.4, -2.3);
      three.renderer.setClearColor(new THREE.Color(0xffffff), 1.0);

      view = mathbox
        .set({
          scale: 1200,
          focus: three.camera.position.length(),
        })
        .cartesian({
          range: [
            [-2, 2],
            [0, 1],
            [-2, 2],
          ],
          scale: [2, 1, 2],
        });

      view.axis({
        axis: 1,
      });
      view.axis({
        axis: 3,
      });

      view.grid({
        width: 4,
        opacity: 0.5,
        axes: [1, 3],
      });

      view.matrix({
        id: "size",
        expr: function (emit, i, j, time) {
          var a = 0.5 + 0.5 * Math.cos(time * 0.873 + i) * (j % 2);
          var b = 0.5 + 0.5 * Math.sin(time + j) * (i % 2);

          emit(a * b);
        },
        width: 32,
        height: 32,
        channels: 1,
      });

      view.area({
        id: "sampler",
        width: 32,
        height: 32,
        axes: [1, 3],
        expr: function (emit, x, y, i, j, time) {
          emit(x, 0.25 + 0.25 * (Math.sin(x + time) * Math.sin(y + time)), y);
        },
      });
      view.point({
        color: 0x3090ff,
        size: 20,
        sizes: "#size",
      });

      view
        .transform({
          position: [0, 0.5, 0],
        })
        .point({
          color: 0xffffff,
          size: 38,
          sizes: "#size",
          shape: "diamond",
          fill: true,
          zBias: -1,
        });
      view
        .transform({
          position: [0, 0.5, 0],
        })
        .point({
          color: 0x30c030,
          size: 40,
          sizes: "#size",
          shape: "diamond",
          fill: false,
        });

      view
        .matrix({
          expr: function (emit, i, j, time) {
            var r = 0.5 + Math.cos(time * 0.873) * j;
            var g = 0.5 + Math.sin(time) * i;
            var b = 1;
            var m = g * 0.75;
            var n = (r + g + b) / 3;

            r = Math.max(r, m, n * n);
            g = Math.max(g, m, n * n);
            b = Math.max(b, m, n * n);

            var rr = ((r * r + r * Math.sin(time * 0.354)) / 2) * 0.9;
            var gg = b + (r + g) * 0.25 * Math.cos(time * 0.289);
            var bb = g + r * 0.5 + b * 0.5;

            rr = rr + (n - rr) * 0.75;
            gg = gg + (n - gg) * 0.75;
            bb = bb + (n - bb) * 0.75;

            emit(rr, gg, bb, 1);
          },
          width: 2,
          height: 2,
          channels: 4,
        })
        .repeat({
          id: "color",
        });

      view
        .transform({
          position: [0, 1, 0],
        })
        .point({
          points: "#sampler",
          colors: "#color",
          sizes: "#size",
          color: 0xffffff,
          size: 40,
          shape: "up",
        });
    </script>
  </body>
</html>