FrequencyFilterContent/viewer.html at master · MicroContent/FrequencyFilterContent · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>FrequencyFilterContentViewer</title>
  <script type="application/javascript">
    /**
        dont delete!
    **/
    function init() {
      window.data = getData();

      setXapiObjectGetter(getXapiObject);
      registerOnSubmitListener(onSubmit);
    }
    /**
        dont delete!
    **/
    function updateLayout() {
      propagateLayoutChanges();
    }
    /**
        dont delete!
    **/
    function sendStatement(stmt) {
      sendXapiStatement(stmt);
    }
  </script>

  <!-- EDIT css for custom styling

        NOTE: you can use Material-css classes for styling
        Source: https://cdn.rawgit.com/FezVrasta/bootstrap-material-design/gh-pages-v3/bootstrap-elements.html
    -->
  <style type="text/css">
  </style>
  <!-- EDIT css for custom styling -->

</head>

<body>
  <!-- EDIT html for card display -->
  <h1 id="title"></h1>

  <div id="container">
    <div id="description"></div>

    <canvas id="canvas" width="600" height="300" style="width: 100%"></canvas>

  </div>
  <!-- <div>
            <button id="toggleHintBtn" class="btn btn-primary" onclick="toggleHint()">Show Hint</button>
        </div> -->
  <div id="coords">

  </div>

  <!-- EDIT html for card display  -->

  <!-- EDIT card logic -->
  <script type="application/javascript">


    function setContent() {
      // Description
      document.getElementById("description").innerText = window.data.description;

      data.tableContent.forEach(function (row) {
        var r = 10;
        var x = row[0] * x_pixel_per_unit;
        var y = -100;

        points.push({
          x: x,
          y: y,
          r: r,
          hit_x: x - r,
          hit_y: y - r,
          hit_width: r * 2,
          hit_height: r * 2,
          correct_from: row[1],
          correct_to: row[2],
          correct: false
        });
      });

      draw();

    }


    function draw() {
      // Reset
      ctx.setTransform(1, 0, 0, 1, 0, 0);
      ctx.clearRect(0, 0, canvas_width, canvas_height);
      ctx.fillStyle = "#000000";

      // Draw grid lines along X-axis
      for (var i = 0; i <= num_lines_x; i++) {
        ctx.beginPath();
        ctx.lineWidth = 1;

        // If line represents X-axis draw in different color
        if (i == x_axis_distance_grid_lines)
          ctx.strokeStyle = "#000000";
        else
          ctx.strokeStyle = "#e9e9e9";

        if (i == num_lines_x) {
          ctx.moveTo(0, grid_size * i);
          ctx.lineTo(canvas_width, grid_size * i);
        }
        else {
          ctx.moveTo(0, grid_size * i + 0.5);
          ctx.lineTo(canvas_width, grid_size * i + 0.5);
        }
        ctx.stroke();
      }

      // Draw grid lines along Y-axis
      for (i = 0; i <= num_lines_y; i++) {
        ctx.beginPath();
        ctx.lineWidth = 1;

        // If line represents Y-axis draw in different color
        if (i == y_axis_distance_grid_lines)
          ctx.strokeStyle = "#000000";
        else
          ctx.strokeStyle = "#e9e9e9";

        if (i == num_lines_y) {
          ctx.moveTo(grid_size * i, 0);
          ctx.lineTo(grid_size * i, canvas_height);
        }
        else {
          ctx.moveTo(grid_size * i + 0.5, 0);
          ctx.lineTo(grid_size * i + 0.5, canvas_height);
        }
        ctx.stroke();
      }

      ctx.translate(y_axis_distance_grid_lines * grid_size, x_axis_distance_grid_lines * grid_size);

      // Ticks marks along the positive X-axis
      for (i = 1; i < (num_lines_y - y_axis_distance_grid_lines); i++) {
        ctx.beginPath();
        ctx.lineWidth = 1;
        ctx.strokeStyle = "#000000";

        // Draw a tick mark 6px long (-3 to 3)
        ctx.moveTo(grid_size * i + 0.5, -3);
        ctx.lineTo(grid_size * i + 0.5, 3);
        ctx.stroke();

        // Text value at that point
        ctx.font = '7px Arial';
        ctx.textAlign = 'start';
        ctx.fillText(x_axis.start * i + x_axis.suffix, grid_size * i - 2, 15);
      }

      // Ticks marks along the negative Y-axis
      // Negative Y-axis of graph is positive Y-axis of the canvas
      for (i = 1; i < x_axis_distance_grid_lines; i++) {
        ctx.beginPath();
        ctx.lineWidth = 1;
        ctx.strokeStyle = "#000000";

        // Draw a tick mark 6px long (-3 to 3)
        ctx.moveTo(-3, -grid_size * i + 0.5);
        ctx.lineTo(3, -grid_size * i + 0.5);
        ctx.stroke();

        // Text value at that point
        ctx.font = 'px Arial';
        ctx.textAlign = 'start';
        ctx.fillText(y_axis.start + 10 * i + y_axis.suffix, -18, -grid_size * i + 3);
      }


      var curve = [];
      // Define Points
      points.forEach(function (p) {
        var c = {};
        if (isShowingSolution) {
          if (p.correct) {
            c.x = p.x;
            c.y = p.y;
            c.r = p.r;
            c.color = color_points_correct;
          } else {
            c.x = p.x;
            c.y = mapToAxis((parseInt(p.correct_from, 10) + parseInt(p.correct_to, 10)) / 2);
            c.r = p.r;
            c.color = color_points_wrong;
          }
        } else {
          c.x = p.x;
          c.y = p.y;
          c.r = p.r;
          c.color = color_points_idle;
        }
        curve.push(c);
      });

      drawCurve(curve);
      // Draw points
      curve.forEach(function (p) {
        ctx.fillStyle = p.color;
        ctx.beginPath();
        ctx.arc(p.x, p.y, p.r, 0, 2 * Math.PI, false);
        ctx.fill();
      });

    }

    function drawCurve(curve) {
      ctx.beginPath();
      ctx.moveTo(0, curve[0].y);
      curve.forEach(function (p) {
        ctx.lineTo(p.x, p.y);
      });
      ctx.lineTo(canvas_width, 0);
      ctx.stroke();
    }

    function onMouseDown(event) {
      var position = getPosition(event);
      var x = position[0];
      var y = position[1];

      var hits = points.filter(function (rect) { return x > rect.hit_x && x < rect.hit_x + rect.hit_width && y > rect.hit_y && y < rect.hit_y + rect.hit_height });

      if (hits.length > 0) {
        selectedPoint = hits[hits.length - 1];
        selectionStart = selectedPoint.y;
        yStart = y;
        canvas.addEventListener("mousemove", onMouseMove);
        canvas.addEventListener("touchmove", onMouseMove);
      } else {
        selectedPoint = undefined;
      }
    }

    function onMouseUp(event) {
      canvas.removeEventListener("mousemove", onMouseMove);
      canvas.removeEventListener("touchmove", onMouseMove);
    }

    function onMouseMove(event) {
      var position = getPosition(event);
      var x = position[0];
      var y = position[1];

      selectedPoint.y = selectionStart - (yStart - y);
      selectedPoint.hit_y = selectedPoint.y - selectedPoint.r;
      event.preventDefault();
      draw();
    }

    function getPosition(event) {
      var outerRect = getBoundingClientRect();
      var rect = canvas.getBoundingClientRect();
      if (event.targetTouches !== undefined && event.targetTouches.length > 0) {
        var x = (event.targetTouches[0].clientX - rect.left - outerRect.left) * (canvas.width / (rect.right - rect.left)) - grid_size;
        var y = (event.targetTouches[0].clientY - rect.top - outerRect.top) * (canvas.height / (rect.bottom - rect.top)) - (canvas.height - grid_size);
      } else if (event.changedTouches !== undefined && event.changedTouches.length > 0) {
        var x = (event.changedTouches[0].clientX - rect.left - outerRect.left) * (canvas.width / (rect.right - rect.left)) - grid_size;
        var y = (event.changedTouches[0].clientY - rect.top - outerRect.top) * (canvas.height / (rect.bottom - rect.top)) - (canvas.height - grid_size);
      } else {
        var x = (event.clientX - rect.left - outerRect.left) * (canvas.width / (rect.right - rect.left)) - grid_size;
        var y = (event.clientY - rect.top - outerRect.top) * (canvas.height / (rect.bottom - rect.top)) - (canvas.height - grid_size);
      }
      return [x, y];
    }

    function getXapiObject() {
      return {};
    }

    function onInteraction() { }

    function onSubmit() {
      if (!isShowingSolution) {
        points.forEach(function (p) {
          var mapped = mapToDb(p.y);

          if (mapped >= p.correct_from && mapped <= p.correct_to) {
            p.correct = true;
          }
        });

        canvas.removeEventListener("mousedown", onMouseDown);
        canvas.removeEventListener("mouseup", onMouseUp);
        canvas.removeEventListener("touchstart", onMouseDown);
        canvas.removeEventListener("touchend", onMouseUp);
        updateLayout();
        isShowingSolution = true;
      } else {
        points.forEach(function (p) {
          p.correct = false;
        });

        canvas.addEventListener("mousedown", onMouseDown);
        canvas.addEventListener("mouseup", onMouseUp);
        canvas.addEventListener("touchstart", onMouseDown);
        canvas.addEventListener("touchend", onMouseUp);
        updateLayout();
        isShowingSolution = false;
      }
      draw();
    }

    function mapToDb(y) {
      y *= -1;
      y -= 10;
      return y_axis.start + y * y_unit_per_pixel;
    }

    function mapToAxis(db) {
      return map(db, y_axis.start, 40, -10, -280)
    }

    function map(num, in_min, in_max, out_min, out_max) {
      return ((num - in_min) * (out_max - out_min) / (in_max - in_min) + out_min);
    }

    function rowToString(row) {
      var s;
      for (var i = 0; i < row.cells.length; i++) {
        s += row.cells[i].firstChild.value
      }
      return s;
    }

    // currently not used
    function rowToArray(row) {
      var r = [];
      for (var i = 0; i < row.cells.length; i++) {
        r.push(row.cells[i].firstChild.value);
      }
      return r;
    }

    /**
        function init() -> dont delete! used for initialization.
    **/
    init();

    var isShowingSolution = false;
    var canvas = document.getElementById("canvas");
    canvas.addEventListener("mousedown", onMouseDown);
    canvas.addEventListener("mouseup", onMouseUp);
    canvas.addEventListener("touchstart", onMouseDown);
    canvas.addEventListener("touchend", onMouseUp);
    var points = [];
    var coords = document.getElementById("coords");

    var grid_size = 25;
    var x_axis = { start: 1000, suffix: '', datapoints: [10, 20, 30, 40, 50, 100, 200, 300, 400, 500, 1000, 2000, 3000, 4000, 5000, 10000, 10500, 20000] };
    var y_axis = { start: -70, suffix: 'db' };

    var ctx = canvas.getContext("2d");

    // canvas width
    var canvas_width = canvas.width;

    // canvas height
    var canvas_height = canvas.height;

    // no of vertical grid lines
    var num_lines_x = Math.floor(canvas_height / grid_size);

    // no of horizontal grid lines
    var num_lines_y = Math.floor(canvas_width / grid_size);

    var x_axis_distance_grid_lines = num_lines_x - 1;
    var y_axis_distance_grid_lines = 1;

    var x_pixel_per_unit = grid_size / x_axis.start;
    var y_pixel_per_unit = grid_size / 10;
    var y_unit_per_pixel = 10 / grid_size;

    var color_points_correct = "green";
    var color_points_wrong = "red";
    var color_points_idle = "#3f51b5";
    var selectedPoint;
    var selectionStart;
    var yStart;

    setContent();
    updateLayout();
  </script>
  <!-- EDIT card logic -->

</body>

</html>