test data

.block

license: mit

README.md

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chart.js

// from github.com/usfvgl/defaults-centroid/
function getClassCentroid(data, selectedclass, xDomain, yDomain){
  var classData = data.filter(function(d){
      return d.class == selectedclass;
  });
  var xAvg = d3.mean(classData, function(d) {return d[xDomain]})
  var yAvg = d3.mean(classData, function(d) {return d[yDomain]})
  centroid = {"xAvg": xAvg,
        "yAvg": yAvg,
        "class": selectedclass}
  return centroid;
}

function chart() {
  var colorScheme = 0;
  var colorSchemes = [
    {
      z: ["rgb(215,25,28)", "rgb(253,174,97)", "rgb(171,221,164)", "rgb(43,131,186)"],
      z2: ["rgba(215,25,28, 0.5)", "rgba(253,174,97, 0.5)", "rgba(171,221,164, 0.5)", "rgba(43,131,186, 0.5)"]
    },
    {
      z: ["rgb(228,26,28)", "rgb(55,126,184)", "rgb(77,175,74)", "rgb(152,78,163)"],
      z2: ["rgba(228,26,28, 0.5)", "rgba(55,126,184, 0.5)", "rgba(77,175,74, 0.5)", "rgba(152,78,163, 0.5)"]
    },
    {
      z: ["rgb(27,158,119)", "rgb(217,95,2)", "rgb(117,112,179)", "rgb(231,41,138)"],
      z2: ["rgba(27,158,119, 0.5)", "rgba(217,95,2, 0.5)", "rgba(117,112,179, 0.5)", "rgba(231,41,138, 0.5)"]
    }
  ]
  var centroid_clicked = false;
  var isMouseDown = false;
  var isFaded = false,
      startX,
      startY,
      dragX,
      dragY,
      tutorial = false,
      timer,
      circle_on,
      selectedClass,
      width,
      height,
      centroids = {},
      radius = 35, // size of point
      radiusWidth = 2,  //width of open circle stroke
      xDomain = "carat",
      yDomain = "price",
      zDomain = "cut",
      autoPlay = false,
      playing = false,
      currentI = 0,
      rpw = 10, //rows per second to animate
      loop,
      pause,
      datasetSize,
      drawPoints,
      drawAnimationProgress,
      play,
      drawData = {
        color: {},
        point : {
          solid: true,
          opencircle: false,
          alpha: false
        },
        buffers: {
          solid: {},
          opencircle: {},
          alpha: {}
        },
        alpha: 0.3
      };
  var centroid_circles = [];
  var margin = {top: 30, right: 20, bottom: 30, left: 20};
  var canvasWidth = 900;
  var canvasHeight = 450;
  width = 900 - margin.right - margin.left, // default width
  height = 450 - margin.top - margin.bottom; // default height

  var blending_modes = {
    "source-over": true,
    "multiply": false,
    "screen": false,
    "overlay": false,
    "darken": false,
    "lighten": false,
    "color-dodge": false,
    "color-burn": false,
    "hard-light": false,
    "soft-light": false,
    "difference": false,
    "exclusion": false,
    "hue": false,
    "saturation": false,
    "color": false,
    "luminosity": false
  }



  function my(selection) {
    my.clicks = 0;
    my.startTime = null;
    my.endTime = null;
    selection.each(function(data) {

      //scales
      var x = d3.scaleLinear().range([margin.left, width]);
      var y = d3.scaleLinear().range([height, margin.bottom]);
      var z = d3.scaleOrdinal(colorSchemes[colorScheme].z);
      var z2 = d3.scaleOrdinal(colorSchemes[colorScheme].z2);
      var legendX = d3.scaleLinear().rangeRound([0, margin.right - 70]);
      var progressX = d3.scaleLinear().range([0, 2*Math.PI]);

      //generate chart;
      var root = this;

      canvas = root.appendChild(document.createElement("canvas")),
      context = canvas.getContext("2d");
      canvas.id = "chart-canvas"

      canvas.width = canvasWidth;
      canvas.height = canvasHeight;

      events_canvas = root.appendChild(document.createElement("canvas"));
      econtext = events_canvas.getContext("2d");
      events_canvas.id = "events-canvas";

      events_canvas.width = canvasWidth;
      events_canvas.height = canvasHeight;


      // generate controls
      var node = document.createElement("div");
      var visual_controls_node = document.createElement("form");
      var visual_controls = root.appendChild(visual_controls_node);

      //point functions
      var point = d3.symbol()
          .size(radius)
          .context(context);

      var openpoint = d3.symbol()
          .size(radius + radiusWidth)
          .context(context);

      var animation_circle = d3.symbol()
          .size(750)
          .context(context);

      context.translate(margin.left, margin.top);
      context.font = "12px sans-serif";

      x.domain([0,10]);
      y.domain([0,10]);
      z.domain(d3.map(data, function(d){return d[zDomain];}).keys());

      datasetSize = data.length;

      z.domain().forEach(function (d, i){
        //set initial values for <label>
        drawData.color[d] = {
          selected: true,
          x: margin.left + width + 5,
          y: margin.top + ((height -30*z.domain().length) /2) + 5 + i*30,
          count: 0
        };
        // also set values for event canvas circles
        var xCor = 80 + 60*i;
        var yCor = 0;
        centroid_circles.push({
          x: xCor,
          y: yCor,
          class: d,
          fill: z2(d),
          radius: 20,
          isDragging: false
        })
        // get actual centroid
        centroids[d] = getClassCentroid(data, d, xDomain, yDomain);
        centroids[d].x = Math.floor(x(centroids[d].xAvg));
        centroids[d].y = Math.floor(y(centroids[d].yAvg));
        centroids[d].fill = z2(centroids[d].class);
        centroids[d].solidFill = z(centroids[d].class);
      });

      //define buffers
      Object.keys(drawData.buffers).forEach(function(pointType){
        Object.keys(drawData.color).forEach(function(d) {
          var grayOffScreenCanvas= document.createElement('canvas');
          grayOffScreenCanvas.width= width + radius + 2;
          grayOffScreenCanvas.height= height;
          var graycontext= grayOffScreenCanvas.getContext("2d");

          var offScreenCanvas= document.createElement('canvas');
          offScreenCanvas.width= width + radius + 2;
          offScreenCanvas.height= height;
          var colorcontext= offScreenCanvas.getContext("2d");

          drawData.buffers[pointType][d] = {
            gray: {
              context: graycontext,
              canvas: grayOffScreenCanvas,
              image: null
            },
            color: {
              context: colorcontext,
              canvas: offScreenCanvas,
              image: null
            }
          }
        });
      })

      //draw initial points and buffers
      var selectedPoint = getSelectedPointType();

      data.forEach(function(d) {
        d.x = Math.floor(x(d[xDomain]));
        d.y = Math.floor(y(d[yDomain]));

        drawData.color[d[zDomain]].count += 1;

        //draw point in context
        context.translate(d.x, d.y);
        if (selectedPoint === "solid") {
          context.fillStyle = z(d[zDomain]);
          context.strokeStyle = "white";
          context.beginPath();
          point(d);
          context.closePath();
          context.fill();
          context.stroke();

        } else if (selectedPoint === "opencircle") {
          context.strokeStyle = z(d[zDomain]);
          context.beginPath();
          openpoint(d);
          context.closePath();
          context.stroke();
        } else if (selectedPoint === "alpha") {
          context.fillStyle = z(d[zDomain])
          context.globalAlpha = drawData.alpha;
          context.beginPath();
          point(d);
          context.closePath();
          context.fill();
          context.globalAlpha = 1.0;
        }
        context.translate(-d.x, -d.y);
      });

      // define image data
      var defineImageData = function(callback){
        Object.keys(drawData.buffers).forEach(function(pointType) {
          Object.keys(drawData.buffers[pointType]).forEach(function(d) {
            drawData.buffers[pointType][d].gray.image = new Image();
            drawData.buffers[pointType][d].gray.image.src = drawData.buffers[pointType][d].gray.canvas.toDataURL();

           drawData.buffers[pointType][d].color.image = new Image();
            drawData.buffers[pointType][d].color.image.src = drawData.buffers[pointType][d].color.canvas.toDataURL();
          });
        })
        legendX.domain([0, d3.max(Object.keys(drawData.color), function (d) { return drawData.color[d].count; })]);
        progressX.domain([0, datasetSize]);
        drawCentroidCircles();
        callback();
      }
      // draw axises
      xAxis();
      yAxis();

      var drawBuffers = function (d) {
        var selectedPointType = getSelectedPointType();
        //redraw points from correct buffers
        //draw gray buffers first
        Object.keys(drawData.color).forEach(function(c) {
          if(!drawData.color[c].selected && (!d || c !== d)) {
            context.drawImage(drawData.buffers[selectedPointType][c].gray.image, 0, 0);
          }
        })

        //draw color buffers
        Object.keys(drawData.color).forEach(function(c) {
          if(drawData.color[c].selected && (!d || c !== d)) {
            context.drawImage(drawData.buffers[selectedPointType][c].color.image, 0, 0);
          }
        })

        if (d){
          //draw the color that was clicked on, last
          if(drawData.color[d].selected) {
            context.drawImage(drawData.buffers[selectedPointType][d].color.image, 0, 0);
          } else {
            context.drawImage(drawData.buffers[selectedPointType][d].gray.image, 0, 0);
          }
        }
      }
      // define draw animation progress
      drawAnimationProgress = function() {
        context.save();
        context.globalCompositeOperation = "source-over";
        context.translate(width - 120, -20);
        //clear progress area
        context.clearRect(-5, -5, 50, 50);

        context.fillStyle = "gray";
        context.lineWidth = 5;
        context.beginPath();
        context.arc(20,20,18,0,2*Math.PI);
        context.strokeStyle = "gray";
        context.stroke();

        context.strokeStyle = "white";
        context.beginPath();
        context.arc(20,20,18,progressX(currentI), progressX(currentI) + 0.2);
        context.stroke();
        context.lineWidth = 1;
        context.restore();
      }

      function drawCentroidCircles() {
        econtext.clearRect(0,0, events_canvas.width, events_canvas.width);
        econtext.save();
        econtext.translate(margin.left, margin.top);
        for (var i = 0; i < centroid_circles.length; i++) {
          var circle = centroid_circles[i];
          var xCoor = circle.x;
          var yCoor = circle.y;

          if(circle.isDragging){
            xCoor += dragX;
            yCoor += dragY;
          }
          if (xCoor > width + margin.left - margin.right) {
            xCoor = width + margin.left - margin.right
          } else if (xCoor < margin.left) {
            xCoor = margin.left
          }
          if (yCoor > height + margin.top - margin.bottom) {
            yCoor = height + margin.top - margin.bottom
          }
          econtext.beginPath();
          econtext.arc(xCoor, yCoor, circle.radius + 3, 0, 2 * Math.PI, false);
          econtext.fillStyle = "rgba(255,255,255,0.5)";
          econtext.fill();
          econtext.closePath();
          econtext.beginPath();
          econtext.arc(xCoor, yCoor, circle.radius, 0, 2 * Math.PI, false);
          econtext.fillStyle = circle.fill;
          econtext.fill();
          econtext.closePath();
          drawCrosshairs(xCoor, yCoor);

        };
        econtext.restore();
      }

      function drawCrosshairs(x, y) {
        // draw cross hairs
        econtext.strokeStyle = "gray";
        econtext.beginPath();
        econtext.moveTo(x-5,y);
        econtext.lineTo(x+5,y);
        econtext.stroke();
        econtext.beginPath();
        econtext.moveTo(x,y-5);
        econtext.lineTo(x,y+5);
        econtext.stroke();

      }

      //define loop function
      loop = function() {
        timer = d3.interval(function (elapsed) {
          if (playing) {
            drawAnimationProgress();
            for (var i = 0; i < rps; i++) {
              var d = data[currentI];
              d.x= Math.round(x(d[xDomain]));
              d.y = Math.round(y(d[yDomain]));
              context.translate(d.x, d.y);
              var selectedPointType = getSelectedPointType();
              if (selectedPointType === "solid") {
                if(drawData.color[d[zDomain]].selected) {
                  context.fillStyle = z(d[zDomain]);
                } else {
                  context.fillStyle = "lightgray";
                }
                context.strokeStyle = "white";
                context.beginPath();
                point(d);
                context.closePath();
                context.fill();
                context.stroke();
              } else if (selectedPointType === "opencircle") {
                if(drawData.color[d[zDomain]].selected) {
                  context.strokeStyle = z(d[zDomain]);
                } else {
                  context.strokeStyle = "lightgray";
                }
                context.beginPath();
                openpoint(d);
                context.closePath();
                context.stroke();
              } else if (selectedPointType === "alpha") {
                context.globalAlpha = drawData.alpha;

                if(drawData.color[d[zDomain]].selected) {
                  context.fillStyle = z(d[zDomain]);
                } else {
                  context.fillStyle = "lightgray";
                }
                context.beginPath();
                point(d);
                context.closePath();
                context.fill();
                context.globalAlpha = 1.0;
              }
              context.translate(-d.x, -d.y);
              incrementCurrentI();
            }
          } else  {
            timer.stop();
          }
        }, 100)
        }

      // draw starting canvas after image data has been defined
      defineImageData(function() {});

      //https://stackoverflow.com/questions/55677/how-do-i-get-the-coordinates-of-a-mouse-click-on-a-canvas-element
      function getCursorPosition(canvas, event) {
          var rect = events_canvas.getBoundingClientRect();
          var x = event.clientX - rect.left;
          var y = event.clientY - rect.top;
          return [x, y];
      }

      //https://stackoverflow.com/questions/17424623/canvas-drag-and-drop-with-multiple-items
      //https://stackoverflow.com/questions/16792841/detect-if-user-clicks-inside-a-circle
    function setDragging(x,y){
        var dx = x - margin.left;
        var dy = y - margin.top;

        for(var i = 0; i < centroid_circles.length; i++){
            var circle = centroid_circles[i];
            if(Math.sqrt((dx-circle.x)*(dx-circle.x) + (dy-circle.y)*(dy-circle.y)) < circle.radius){
                for (var j = 0; j < centroid_circles.length; j++) {
                  centroid_circles[j].isDragging = false;
                };
                circle.isDragging = true;
                break;
            }
        }
    }

    function clearDragging(x, y){
        for(var i = 0; i < centroid_circles.length;i++){
            var circle = centroid_circles[i];
            if(circle.isDragging){
                circle.isDragging = false;
                if (dragX !== undefined && dragY !== undefined) {
                  circle.x += dragX;
                  circle.y += dragY;
                }
                if (circle.x > width + margin.left - margin.right) {
                  circle.x = width + margin.left - margin.right
                } else if (circle.x < margin.left) {
                  circle.x = margin.left
                }
                if (circle.y > height + margin.top - margin.bottom) {
                  circle.y = height + margin.top - margin.bottom
                }
            }
        }
        dragX = 0
        dragY = 0
    }

    function handleMouseDown(e){
      if(my.clicks == 0){
        my.startTime = Date.now()
      }
      my.clicks += 1;
      mouse = getCursorPosition(events_canvas, e);
      mouseX = mouse[0];
      mouseY = mouse[1];

      startX = mouseX;
      startY = mouseY;
      setDragging(startX,startY);
      isMouseDown=true;
    }

    function handleMouseUp(e){
      my.endTime = Date.now();
      mouse = getCursorPosition(events_canvas, e);
      mouseX = mouse[0];
      mouseY = mouse[1];

      isMouseDown=false;
      clearDragging();

      var isValid = true;

      for (var i = 0; i < centroid_circles.length; i++) {
        var circle = centroid_circles[i]
        isValid = isValidCoor(circle.x, circle.y);
        if (isValid === false) {
          break
        }
      };

      my.valid = isValid;

      if(my.valid){
        document.getElementById('warning').innerHTML = "";
        experimentr.release();
      } else {
        document.getElementById('warning').innerHTML = "Warning: The \"Next\" button will only be enabled when the highlighted region is on the plot.";
        experimentr.hold();
      }
    }

    function handleMouseOut(e){
      mouse = getCursorPosition(events_canvas, e);
      mouseX = mouse[0];
      mouseY = mouse[1];

      isMouseDown=false;
      clearDragging();
    }

    function handleMouseMove(e){
      mouse = getCursorPosition(events_canvas, e);
      mouseX = mouse[0];
      mouseY = mouse[1];

      if(isMouseDown){
          dragX = mouseX - startX;
          dragY = mouseY - startY;
          drawCentroidCircles(mouseX,mouseY);
      }

    }

    events_canvas.addEventListener("mousedown", handleMouseDown);
    events_canvas.addEventListener("mousemove", handleMouseMove);
    events_canvas.addEventListener("mouseup", handleMouseUp);
    events_canvas.addEventListener("mouseout", handleMouseOut);


    var togglePoints = function() {
      var wasPlaying = false;
      if (playing) {
        pause();
        wasPlaying = true;
      }

      var pointType = this.getAttribute("value");

      Object.keys(drawData.point).forEach(function(p) {
        drawData.point[p] = false;
      });
      drawData.point[pointType] = true;

      // clear canvas
      context.clearRect(1,0,width + margin.right ,height + 2);

      //redraw points from correct buffers
      //draw gray buffers first
      Object.keys(drawData.color).forEach(function(c) {
        if(!drawData.color[c].selected) {
          context.drawImage(drawData.buffers[pointType][c].gray.image, 0, 0);
        }
      })

      //draw color buffers
      Object.keys(drawData.color).forEach(function(c) {
        if(drawData.color[c].selected) {
          context.drawImage(drawData.buffers[pointType][c].color.image, 0, 0);
        }
      })

      if (wasPlaying) {
        play();
      } else {
        //redraw animation progress
        drawAnimationProgress();
      }
    }

    function getSelectedPointType() {
      var selected;
      Object.keys(drawData.point).forEach(function(p) {
        if (drawData.point[p]) {
          selected = p;
        }
      });
      return selected;
    }

    function xAxis() {
      var tickCount = 10,
          tickSize = 6,
          ticks = x.ticks(tickCount),
          tickFormat = x.tickFormat();
      context.save();
      context.beginPath();

      ticks.forEach(function(d) {
        context.moveTo(x(d), height);
        context.lineTo(x(d), height + tickSize);
      });
      context.strokeStyle = "gray";
      context.stroke();

      context.fillStyle = "gray";
      context.beginPath();
      context.moveTo(13, height);
      context.lineTo(width, height);
      context.strokeStyle = "gray";
      context.stroke();

      context.textAlign = "center";
      context.textBaseline = "top";
      ticks.forEach(function(d) {
        context.fillText(tickFormat(d), x(d), height + 3 + tickSize);
      });
      context.restore();
    }

    function yAxis() {
      var tickCount = 10,
          tickSize = 6,
          tickPadding = 3,
          ticks = y.ticks(tickCount),
          tickFormat = y.tickFormat(tickCount);
      context.save();
      context.beginPath();
      ticks.forEach(function(d) {
        context.moveTo(margin.left, y(d));
        context.lineTo(margin.left-6, y(d));
      });
      context.strokeStyle = "gray";
      context.stroke();
      context.fillStyle = "gray";
      context.beginPath();
      context.moveTo(margin.left, margin.top);
      context.lineTo(margin.left, height);
      context.lineTo(margin.left-tickSize, height);
      context.strokeStyle = "gray";
      context.stroke();

      context.textAlign = "right";
      context.textBaseline = "middle";
      ticks.forEach(function(d) {
        context.fillText(tickFormat(d), margin.left - tickSize - tickPadding, y(d));
      });
      context.restore();
    }

    function incrementCurrentI () {
      currentI = (currentI + 1) % datasetSize;
    }
    function pause () {
      playing = false;
    }

    function play () {
      playing = true;
      loop();
    }

    if (autoPlay) {
      play();
    }
  });

  }

  var isValidCoor = function(x, y) {
    if (x > 0 && x < 0+width && y > 0 && y < 0 + height) {
      return true;
    } else {
      return false;
    }
  }

  my.centroidInfo = function() {
    var centroidInfo = {}
    centroidInfo.actual = centroids;
    centroidInfo.guess = {};
    for (var i = 0; i < centroid_circles.length; i++) {
      var circle = centroid_circles[i];
      centroidInfo.guess[circle.class] = {
        x: circle.x,
        y: circle.y
      }
    };
    return centroidInfo;
  };

  my.width = function(value) {
    if (!arguments.length) return width;
    canvasWidth = value;
    width = value - margin.right - margin.left;
    return my;
  };

  my.height = function(value) {
    if (!arguments.length) return height;
    canvasHeight = value;
    height = value - margin.top - margin.bottom;
    return my;
  };

  my.autoPlay = function(value) {
    if (!arguments.length) return autoPlay;
    autoPlay = value;
    return my;
  }

  my.animationSpeed = function(value) {
    if (!arguments.length) return rps;
    rps = value;
    return my;
  }

  my.pointType = function(value) {
    if (!arguments.length) return drawData.point[value];
    drawData.point = {
          solid: false,
          opencircle: false,
          alpha: false
        }
    drawData.point[value] = true;
    return my;
  }

  my.radius = function(value) {
    if (!arguments.length) return radius;
    radius = value;
    return my;
  }

  my.xDomain = function(newXDomain) {
    if (!arguments.length) return xDomain;
    xDomain = newXDomain;
    return my;
  }

  my.yDomain = function(newYDomain) {
    if (!arguments.length) return yDomain;
    yDomain = newYDomain;
    return my;
  }

  my.zDomain = function(newZDomain) {
    if (!arguments.length) return zDomain;
    zDomain = newZDomain;
    return my;
  }

  my.selectedClass = function(newclass) {
    if (!arguments.length) return selectedClass;
    selectedClass = newclass;
    return my;
  }

  my.tutorial = function(booleanval) {
    if (!arguments.length) return tutorial;
    tutorial = booleanval;
    return my;
  }

  my.stop = function() {
    if (timer) {
      timer.stop();
    }
  }

  my.faded = function (value) {
    if (!arguments.length) return isFaded;
    isFaded = value;
    return my;
  }

  my.colorScheme = function(value) {
    if (!arguments.length) return colorScheme;
    colorScheme = value;
    return my;
  }

  my.realCentroid = function() {
    if (tutorial) {
      var canvas = document.getElementById("chart-canvas")
      var ecanvas = document.getElementById("events-canvas")
      var econtext = ecanvas.getContext("2d");
      var context = canvas.getContext("2d");
      //code to fade tutorial canvas
      // if (!my.faded()) {
      //   context.save();
      //   context.beginPath();
      //   context.rect(0,0, canvas.width, canvas.height)
      //   context.closePath();
      //   context.fillStyle = "rgba(255,255,255,0.5)";
      //   context.fill();
      //   context.restore();
      //   my.faded(true);
      // }

      //draw centroid circles without crosshair
      econtext.clearRect(0,0, events_canvas.width, events_canvas.width);
      econtext.save();
      econtext.translate(margin.left, margin.top);
      for (var i = 0; i < centroid_circles.length; i++) {
        var circle = centroid_circles[i];
        econtext.beginPath();
        if(circle.isDragging){
          econtext.arc(circle.x + dragX, circle.y + dragY, circle.radius, 0, 2 * Math.PI, false);
          econtext.fillStyle = circle.fill;
          econtext.fill();
          drawCrosshairs(circle.x + dragX, circle.y + dragY);
        } else {
          econtext.arc(circle.x, circle.y, circle.radius, 0, 2 * Math.PI, false);
          econtext.fillStyle = circle.fill;
          econtext.fill();
        }

      };

      econtext.globalCompositeOperation = "multiply";

      Object.keys(centroids).forEach(function (d, i) {
        //draw tutorials
        econtext.beginPath();
        econtext.arc(centroids[d].x, centroids[d].y, 20, 0, 2 * Math.PI, false);
        econtext.lineWidth = 6;
        econtext.strokeStyle = "white";
        econtext.stroke();
        econtext.beginPath();
        econtext.moveTo(centroids[d].x-3,centroids[d].y);
        econtext.lineTo(centroids[d].x+3,centroids[d].y);
        econtext.stroke();
        econtext.beginPath();
        econtext.moveTo(centroids[d].x,centroids[d].y-3);
        econtext.lineTo(centroids[d].x,centroids[d].y+3);
        econtext.stroke();

        econtext.beginPath();
        econtext.arc(centroids[d].x, centroids[d].y, 20, 0, 2 * Math.PI, false);
        econtext.lineWidth = 1;
        econtext.strokeStyle = centroids[d].solidFill;
        econtext.stroke();
        econtext.stroke();
        econtext.beginPath();
        econtext.moveTo(centroids[d].x-3,centroids[d].y);
        econtext.lineTo(centroids[d].x+3,centroids[d].y);
        econtext.stroke();
        econtext.stroke();
        econtext.beginPath();
        econtext.moveTo(centroids[d].x,centroids[d].y-3);
        econtext.lineTo(centroids[d].x,centroids[d].y+3);
        econtext.stroke();
        econtext.stroke();
      })
      econtext.restore();
    }
  }

  return my;
}

easy.csv

index.html

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="chart.js"></script>
  <style>
    #chart-canvas {
  position: absolute;
  z-index: 1;
}

#events-canvas {
  position: relative;
  top: 0px;
  left: 0px;
  z-index: 2;
}
.hidden {
  display: none;
}

#plot {
  position: relative;
}
  </style>
</head>

<body>
  <button type="button"
			onclick="taskResponse.realCentroid()">Click for real answer!</button> Dataset Select:
  <select id="dataset">
  <option value="test1.csv">1</option>
  <option value="test2.csv">2</option>
  <option value="test3.csv">3</option>
  <option value="test4.csv">4</option>
  <option value="test5.csv">5</option>
  <option value="test6.csv">6</option>
  <option value="test7.csv">7</option>
  <option value="test8.csv">8</option>
  <option value="easy.csv">easy</option>
  <option value="train1.csv">t1</option>
  <option value="train2.csv">t2</option>
</select>
  <div id="plot"></div>
  <div id="warning" style="color:red">Warning: The "Next" button will only be enabled when your centroid region is on the plot.</div>
  <script>
   var taskResponse;
   var drawChart = function () {
      var dataset = this.value
      if (!dataset) {
        dataset = "test1.csv"
      } else {
        taskResponse.stop();
        var plotElem = document.getElementById("plot");
        plotElem.innerHTML = ""
      }
     
      d3.csv(dataset, function (d) {
	      d.xDom = +d.xDom;
	      d.yDom = +d.yDom;
	      return d;
	    }, function (err, data) {
	      if (err) {console.log(err)}
	      taskResponse = chart()
	          .width(600)
	          .height(600)
	          .pointType("solid")
	          .xDomain("xDom")
	          .yDomain("yDom")
	          .zDomain("class")
	          .autoPlay(true)
	          .animationSpeed(85)
	          .tutorial(true)
						.colorScheme(2)
	      d3.select("#plot")
	        .datum(data)
	        .call(taskResponse)
	    });
    }
    var selector = document.getElementById("dataset");
		selector.addEventListener("change", drawChart)
		drawChart()
  </script>
</body>

test1.csv

test2.csv

test3.csv

test4.csv

test5.csv

test6.csv

test7.csv

xDom,yDom,class
6.092068712714312,7.521115290203844,A
4.7467801166502435,9.058831729816477,D
7.784510660104901,2.784930640364239,B
8.230035496460426,4.071588238395003,D
5.4565118384771525,8.380299463381213,B
2.1213987696633465,2.7321602280460118,C
5.637377973270253,7.941248154896625,D
3.3776557467694146,3.0482453851045093,B
5.514916275106133,7.1749060554759945,B
1.5280900212439041,2.1390042389881323,B
4.88910321266089,7.478784981429283,B
1.98852749716356,2.719222579600262,A
7.208032944598465,2.748254722812275,D
2.0427667535499463,3.2143802330134172,C
3.3365684334605605,2.5349903613570866,A
8.532034836068545,2.1886530749235837,B
8.284360604378156,3.059731046024019,B
2.48118168149219,3.131865306196054,C
2.3171219676994754,2.65604437610801,A
8.325504561970607,2.9694261496028878,D
1.6273080893453793,2.800930014073687,A
2.1277389760559884,2.8672475331875376,D
8.150700433660925,3.462191153501599,B
5.182316046667746,7.842672660103535,C
5.660019507975295,7.561918518296862,B
2.740743039982781,2.0044423413974117,A
7.81105330546639,2.589336415888969,B
8.660304443615848,2.762374177015161,D
1.913769520760428,3.1327907878571972,B
8.386506712743484,3.8873237125273237,B
5.84417779556656,8.22094215507213,D
5.385809302704485,8.151366543848884,C
7.417640880378323,3.6917572435786177,C
4.676761735155217,7.2811813089062,B
5.750356015099262,7.4405539331676405,B
1.6653817605282066,3.286212320278279,B
4.812382030662334,7.709464290161947,B
6.687732632164804,2.899761127899396,B
2.126450804673779,3.494236618269224,D
3.2437892848363465,3.0417419419918055,D
3.0832298340182276,3.707484204373075,B
7.280429673997375,1.9112082051105963,A
8.787956419293423,3.3465122460618293,B
4.42262456986179,7.9355253114328255,B
3.303150042258298,3.207774408603158,D
1.6256780688798527,2.4805870489879824,C
1.335830447760447,3.1143790188772478,D
1.3654540269521065,2.497920156201693,A
5.954034233964364,8.7267718130394,B
1.2651344476409039,2.728550393360141,D
4.135439439254379,8.520943381409595,B
3.0197292053233618,3.790117217831995,C
5.3368926387508395,7.182434056031629,B
4.225910875376211,7.1319108659712045,B
7.888433642586903,3.134690254790012,D
3.1205880531998353,2.3113291360428025,D
2.023993891850505,4.077338018848196,D
6.764866379676023,3.40690675090808,D
1.799170235994357,3.8916470443246673,D
4.4186560481087165,8.374198263029946,B
2.5721816113846008,2.7608159200785427,C
4.855316480773139,8.152071214621724,D
2.37296828219563,3.6034352758644776,D
4.712244612912227,7.630255461786318,B
2.2034028974737443,3.219894070669141,D
7.453844624575083,3.5648131052420076,A
7.238360487000277,3.6361475282385816,B
2.9161471257632283,2.3685744479790523,C
5.035525469026354,8.587109173495989,B
4.474436758255339,6.955849455860518,B
1.4043693134092745,2.8640351281612153,A
2.984604755826626,2.3323723036564443,D
5.512488364990486,7.948205813421599,B
4.886180138723624,7.657116711271906,B
8.417195629870083,3.548492490657326,C
8.640786792403274,3.74066568067489,B
5.088475538740369,7.467091740102823,A
7.657405898135519,3.07001651793102,B
7.9341189946849555,2.345534721881191,D
6.828841238411046,3.4052102828687953,C
4.393299213005205,7.924959928588068,B
5.803798522294706,8.332314890897372,B
2.250830491477692,3.0646325563528687,D
2.7200511859750653,2.4004761675244115,C
2.062303948328682,2.930044408212555,D
1.3005550430581445,2.530735092577208,C
6.911805651879912,2.267211876043663,C
5.131550988581658,8.200535668907312,D
1.9481802028835185,2.868680433587169,A
5.365170877929199,8.220497064148223,B
2.3143412404989196,3.044655316375887,A
2.5002023661751585,3.427065818059591,D
4.4263522673970535,8.802688157319151,B
5.301344668380057,7.000823777559436,C
1.3017054162873287,2.992981163111447,A
1.9373223615312578,2.6229367463605406,D
4.776074447765985,7.711029502149319,B
6.613208961051958,3.2857771863394047,D
5.103313558249924,9.030412836551337,A
7.862651482095159,3.260849429725093,C
2.07474747156545,3.476573965289447,A
5.213720556750332,9.15103054362425,B
3.893117708148126,8.092599317239053,B
1.6813948520154236,2.978099130270488,D
8.084560979307993,2.316162083344886,B
2.632762103979908,3.083296864911194,A
4.605780514282102,8.672877319172876,D
4.150172726596405,8.076585672598913,A
8.348908808057713,2.1835013533548477,C
4.594052657296198,7.309552019034521,B
8.073542370667365,3.4363436783564887,D
1.890484266833928,2.0844511373769983,A
8.69202729250602,3.715772948987029,C
7.230442310043528,2.7670308352222905,C
8.695482176825092,3.394012743191684,A
5.050602925382619,8.962597150914705,D
3.919470995910407,8.142268390167482,B
8.13650773207018,4.0619694410592615,A
2.2337195607317795,2.557614517617096,A
4.555541974537869,7.9205323559907335,B
4.152257350102198,7.289370309283413,B
4.1918905818445875,7.935184395166395,D
7.995098188756594,2.2949748536227492,D
3.3500905030652404,2.577384417750429,D
1.3934463626855798,3.1577083330188818,D
4.777427275836913,7.647958277660662,C
4.526927872448241,7.188710924809701,B
8.858317453601543,2.749715612227126,B
7.837245657444362,3.257699172314814,B
1.181041952844498,3.5241619376464084,D
6.867822053355715,2.787049888338523,C
7.497624911294514,3.255847291906669,B
6.987501443275229,2.349068918782194,C
8.356863664964719,3.4579415393287407,D
3.0235336451667596,2.3882214581027106,A
7.302746180644294,3.055651098176453,B
1.6005953571378118,3.4189405731694222,D
7.4981478866910924,1.829214147243451,D
5.109950713873115,7.985310231790346,A
4.695182170502642,9.086842207561865,C
8.258590402778955,2.18554671420561,D
2.1973070705678297,3.230568984657884,C
4.672213122889412,8.511956250166628,D
4.410878757709257,7.574724910622688,B
4.706809522200754,7.23861057719877,B
5.62450213634372,8.399711943049137,D
5.830018104517338,8.373337948343512,B
5.038891457058527,7.8924769207175585,B
7.298459601961778,2.388258085322257,B
1.6551179189304959,2.823576067651855,D
4.265929307083263,8.428717891705542,C
1.1751266127629694,3.4163828298199794,D
3.008537625895019,3.8336530384468785,C
5.036295655815419,8.139840643493141,D
4.724570799578328,7.804174277409204,B
6.856905472608189,3.7125477153483866,D
1.760611572314386,2.2747787906011467,A
3.1208661310037664,3.462110374719445,B
7.804230841072963,2.72953353214239,A
8.577345205392902,3.381053469407291,B
6.656515324539801,2.729690318585808,C
5.63441259155066,8.783775540144642,B
5.448451036325534,7.747440542052569,D
1.8873385091403774,3.6749489617141773,D
7.199640377316555,2.5264370037144293,D
7.119280059100414,3.5589298225297306,C
4.506274897437615,7.327383858339873,D
7.913482753484795,3.569464640272472,B
2.082571796963216,4.041012516673369,D
8.57926413722524,3.3548506720064366,D
8.763309447343834,2.5805761669608325,D
5.578043064597159,7.406656312954169,A
7.760483068245087,3.145831783526011,B
2.877942759581006,3.3844599459969635,C
5.753820227145202,7.123522800543679,A
4.113217088924891,8.533170342246146,D
4.525401189708196,8.365176846138734,D
1.100138578343764,3.2102026790756257,A
1.997005518728145,3.3364506232935494,D
8.452126857119843,3.591616951298674,D
2.681790594832507,1.9465203178019035,A
7.979663686397038,3.1019932404704504,D
7.945754346926218,1.9300346103229529,B
1.3060655136394035,3.0697649601148695,A
1.6985341610087392,1.962287310208837,A
5.178513574233174,8.5875880565216,A
2.515997033708481,2.617663893596093,C
4.918363826722548,7.801885269372467,B
1.197559810160958,3.535873997965586,A
2.861874202170233,3.081883610505917,D
7.899395953639032,3.7403291821087734,D
8.472731281279797,3.787550416451827,B
4.700407104924593,7.3469472194336385,B
1.4324367720226205,2.702860506317995,A
4.609582336176098,8.299871265783244,C
7.418247135832431,4.053439430074055,B
8.58327703808989,2.555791549151242,C
5.881166512751252,8.30293529411173,B
4.279058132312765,8.16674487246594,A
6.863200184206917,2.9331114381067143,C
4.589248207962055,7.702642332544276,B
3.0049065760862157,3.551978829478993,D
6.877036644667733,3.696011342223699,B
7.194056579818326,3.916859612187447,B
2.7935390020812494,3.759833901877757,A
4.284005403790423,8.544480133357878,D
7.387263112421436,3.912959739885398,A
8.190521713805591,1.9674123260008827,B
5.419332367076999,7.466230947760927,A
2.800427482498202,2.197708086337961,A
7.722755113659093,2.8779251503802423,C
2.302435151102723,2.5727116477741507,D
7.4856389763980715,3.8243885950803342,C
2.0759689105983243,2.9234253197390228,C
3.1271781161917307,2.2440469511703682,A
7.829593846938231,4.15087285413353,C
2.7143252000817846,3.897611311615475,A
4.176752344559118,8.358927793013306,B
2.7147338720150542,2.787042746384875,D
7.239118537999351,3.4324842079343214,B
2.365685476291653,4.011906218950502,A
8.66683804369941,2.821192864931317,B
7.346634926913967,2.167714692699162,C
3.0124715112954665,3.8454794910059853,D
8.14502613171771,3.2085194596704736,B
8.364491019272567,2.914170918492995,C
8.47443944374144,3.2900244819018702,D
3.3607324855795935,2.8065291235605243,A
4.418543114453869,7.253043374876944,B
3.08783848344362,3.2163331406924396,D
2.0790894168834564,3.0880284721521214,A
7.4569738424302745,1.9332887423643779,B
7.5844365201512804,3.4306537582377272,B
2.3555323319965873,3.785485281320957,B
5.168318647878613,8.630259731664554,B
5.5599289594728685,7.255668619962944,C
4.556414737440627,7.57574495294094,D
5.544789273365712,8.470566545836775,C
5.731568201423282,8.467829580740618,B
7.784334385281646,2.2132781948229736,B
2.543201863009215,2.976137272412683,D
6.049090442751908,8.30631190595079,B
5.138605584015379,7.01916939515857,A
4.38021328888222,8.585932993175932,B
4.490200675384857,7.454912301352988,B
2.722789628213782,3.5118224572450307,D
4.453515942480631,8.816643830726097,B
5.894474234251281,7.518476243824622,B
1.7189033687475324,3.448767265920936,A
7.167495877432397,3.247097069473755,C
4.330461124721012,8.962606272871144,A
4.450896945278808,8.716987579329372,A
8.150192504579243,3.828734869249347,B
7.8393227287707035,3.921159140547373,A
6.1710530581951,8.247816429294236,D
7.671945218349873,2.3733944396764883,A
8.660866574471878,3.2648641482500107,B
8.112111596589669,2.9796556740518243,C
2.406442498012407,1.9542916647705315,D
6.724804882552878,2.977974251621163,B
5.302915004436512,8.92156369141848,B
1.9797633501565777,1.9760124323473038,A
2.3699562788440383,2.9021240195139963,B
8.416757825414557,2.447379697883512,C
7.041028913298072,2.7500008632477346,C
4.423708829389389,7.655048267796455,B
8.389845982635379,2.217140247276367,C
7.546421731708878,1.9820653559002113,D
2.1430797868882596,3.685457730402482,D
4.971219073459457,7.164892867863779,B
4.665196878281379,7.0566931152523855,C
2.2282522445867863,3.452490667344206,B
5.016735224477935,8.542725872102181,B
2.939527422701744,3.467239735246386,D
2.2621861132177052,3.070874964294511,D
1.5973396721212791,2.3934241786767783,D
7.094752860396479,3.156814645144851,C
7.302752800439445,2.5613868310424577,D
2.18851843976933,3.69380470875547,A
5.318176781629321,8.726687535454886,D
3.2617545251894464,2.418543602431261,A
5.959352128340185,8.403964130612604,B
1.6782253195780725,3.9145044872844137,A
7.0876940650249445,2.8492918086973016,D
8.041490314882687,3.8943116825068125,D
6.809307603893685,3.2814078720189648,C
7.0982536241797165,2.0436545247139537,D
2.6833629640981256,2.6621148239166557,C
2.4925087783074646,3.107534214784576,D
4.606832913909599,7.516381383594511,B
4.951167216062897,8.653036902353664,B
2.6386543649857757,2.2133808346302013,D
5.003721607893472,7.862459768945023,B
5.309039138902454,8.968275093876382,B
4.691358100710556,7.517097336572326,B
6.637867437206433,2.788639325804552,B
2.247471060684632,2.542981833232363,C
7.297710796719116,3.70001401357768,C
8.840254194200988,2.9103744697078278,D
7.352148230362634,2.6644175079724213,D
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test8.csv

train1.csv

train2.csv