examples/test/lerp.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>MathBox - Lerp Test</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"],
        controls: {
          klass: THREE.OrbitControls,
        },
      });
      three = mathbox.three;

      three.camera.position.set(2.3, 1, 2);
      three.renderer.setClearColor(new THREE.Color(0xffffff), 1.0);

      view = mathbox.cartesian({
        range: [
          [-6, 6],
          [-1, 1],
          [-1, 1],
        ],
        scale: [6, 1, 1],
      });

      view
        .interval({
          width: 16, // number of red data points
          items: 2,
          channels: 2,
          expr: function (emit, x, i, time) {
            var d = Math.sin((x + time) * 2) / 2;

            emit(x, 0);
            emit(x, d);
          },
        })
        .vector({
          color: 0xc02050,
          width: 16,
          size: 3,
          end: true,
        });

      view.lerp({
        // number of blue interpolated values
        // = 16 original samples + (15 gaps * 8 samples per gap)
        width: 136,
      });
      // drop the first sample in each group of 9
      // so that red and blue vectors don't overlap
      view
        .split({
          axis: "x",
          length: 9,
        })
        .slice({
          width: [1, 9],
        })
        .join({
          axis: "x",
        });
      //draw the blue vectors
      view.vector({
        color: 0x3090ff,
        width: 10,
        size: 2.5,
        end: true,
      });
    </script>
  </body>
</html>