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HTML

              
                <canvas id="canvas"></canvas>

<div class="path-data-container">
  <pre id="path-data"></pre>
</div>
              
            
!

CSS

              
                html, body {
  height: 100%;
}

#canvas {
  user-select: none;
  // border: 1px solid black;
  width: 950px;
  height: 600px;
  
  position: absolute;
  left: 170px;
  top: 5px;
}

.path-data-container {
  position: absolute;
  width: 700px;
  left: 220px;
  top: 608px;
}

pre {
  font-size: 12px;
  white-space: normal;
}

              
            
!

JS

              
                console.clear();
var log = console.log.bind(console);

class CustomEase extends Ease {
  constructor(public points = {}) {
    super();
        
    if (points.last && points.last.y !== 1) {
      this._calcEnd = true;
    }    
  }
  
  getRatio(k) {
    
    var points = this.points; 
    var p1 = points.first;
    var p0 = null;
    
    while (p1) {
      
      if (p1.x >= k) {
        p0 = p1.prev;
        break;
      }
      
      p1 = p1.next;
    }
        
    if (!p0) return p1.y;

    var t = ((k - p0.x) / (p1.x - p0.x)) || 0;    
    return p0.y + (p1.y - p0.y) * t;    
  }
}

var pathData = document.querySelector("#path-data");
var canvas = document.querySelector("#canvas");

paper.setup(canvas);
paper.settings.handleSize = 5;

var project = paper.project;
var view = paper.view;

var hitOptions = {
  segments: true,
  stroke: true,
  fill: true,
  tolerance: 5,
  handles: true
};

var easePath = null;
var handle1  = null;
var handle2  = null;
var segment  = null;
var hitStart = null;
var hitEnd   = null;
var plotPath = null;

var tween1 = null;
var tween2 = null;

var tweenTime = 2;
var tweenDelta = 400;

var offset = new paper.Point(50, 50);
var graphSize = new paper.Size(700, 500);

var graph = new paper.Path.Rectangle(offset, graphSize);
graph.style = {
  fillColor: "#eee",
  strokeColor: "#ccc",
  strokeWidth: 0.5
};

var startPoint = offset.add([0, graphSize.height]);
var endPoint = offset.add([graphSize.width, 0]);

var path = new paper.Path({
  strokeWidth: 5,
  strokeColor: "black"
});

var text = new paper.PointText({
  point: offset.add([10, 20]),
  content: "time ...\ny ...",
  fillColor: "black"
});

var box = new paper.Shape.Rectangle({
  point: [800, 450],
  size: [100, 100],
  fillColor: "green",
  locked: true
});

var tweenPoint = new paper.Path.Circle({
  center: startPoint,
  radius: 5,
  fillColor: "#ddd",
  strokeColor: "red",
  strokeWidth: 2,
  locked: true,
});

path.add(startPoint);
path.add(endPoint);

path.fullySelected = true;

paper.view.on("mousedown", downAction);
paper.view.on("mousedrag", dragAction);
paper.view.on("mousemove", moveAction);

var smoothTypes = [
  { type: "continuous" },
  { type: "catmull-rom", factor: 0.5 },
  { type: "geometric", factor: 0.4 },
  { type: "none" },
];

var smoothNames = smoothTypes.map(smooth => smooth.type);
var smoothValue = smoothTypes[0];

var settings = QuickSettings.create(30, 55, "Editor")
  .addDropDown("Smooth Type", smoothNames, value => {
    smoothValue = smoothTypes[value.index];
  })
  .addButton("Smooth Path", smoothPath)
  // .addButton("Ease Points", easePoints)
  .addButton("Reset", clearPoints)
  .addButton("Play", playAnimation)

updatePathData();

function updatePathData() {
  pathData.textContent = path.pathData;
}

function addPoint(point) {
    
  if (point.equals(startPoint) || point.equals(endPoint)) return;
  
  var i = 1;
  
  if (path.segments.length === 2) {
    // temp
  } else {
    
    var max = point.x;    
    var total = path.segments.length;
    
    for (i = 0; i < total; i++) {      
      var seg = path.segments[i];
      if (seg.point.x > max) break;
    }        
  }  
  
  path.insert(i, point);
  segment = path.segments[i];
  smoothPath();
  path.fullySelected = true;  
}

function moveAction(event) {
  
  var point = path.getNearestPoint(event.point).subtract(offset);
  var y = ((point.y / graphSize.height)) * tweenDelta;
  var t = point.x / graphSize.width * tweenTime;
    
  tweenPoint.position = point.add(offset);
  
  text.content = `time: ${t.toFixed(2)}\ny: ${y.toFixed(2)}`;
}

function downAction(event) {
  
  easePath && easePath.remove();
  plotPath && plotPath.remove();
  
  startPoint = path.firstSegment.point.clone();
  endPoint = path.lastSegment.point.clone();
  
  handle1 = handle2 = segment = hitStart = hitEnd = null;
  
  var hit = paper.project.hitTest(event.point, hitOptions);
  
  if (hit) {
    
    if (hit.type === "fill") {      
      addPoint(event.point);
      updatePathData();
      moveAction(event);
      return;
    }
    
    if (hit.segment && hit.segment.point.equals(startPoint)) {
      hitStart = true;
    }
    
    if (hit.segment && hit.segment.point.equals(endPoint)) {
      hitEnd = true;
    }
    
    if (hit.type == "handle-in") {

      handle1 = hit.segment.handleIn;      
      handle2 = hit.segment.handleOut;      
      
    } else if (hit.type == "handle-out") {

      handle1 = hit.segment.handleOut;      
      handle2 = hit.segment.handleIn;
      
    } else if (hit.type == "segment") {
      segment = hit.segment;
    }    
  } 
  
  moveAction(event);
}

function dragAction(event) {
  
  if (segment && !hitStart) {
       
    segment.point = segment.point.add(event.delta);
    
    if (hitEnd) {
      segment.point.x = offset.x + graphSize.width;
    }
  }

  if (handle1) {
    
    handle1.x += event.delta.x;
    handle1.y += event.delta.y;    
    
    // Lock handles?
    // if (hitStart || hitEnd) { return; }
    
    // handle2.x -= event.delta.x;
    // handle2.y -= event.delta.y;
  }
  
  
  updatePathData();
  moveAction(event);
}

function clearPoints() {
  
  easePath && easePath.remove();
  plotPath && plotPath.remove();
  
  var i = path.segments.length - 1;
  
  while (i-- > 1) {
    var seg = path.segments[i];
    seg.remove();
  }    
  
  updatePathData();
  tweenPoint.position = startPoint;
}

function smoothPath() {
    
  easePath && easePath.remove();
  plotPath && plotPath.remove();
  
  if (path) {
    
    if (smoothValue.type === "none") {
      path.segments.forEach(segment => {        
        segment.handleIn = segment.handleOut = null;
      });
    } else {
      path.smooth(smoothValue);
    }
  }
  
  updatePathData();
  tweenPoint.position = startPoint;
}

function easePoints() {
    
  plotPath && plotPath.remove();
  
  easePath && easePath.remove();
  easePath = path.clone();
  easePath.flatten(0.05);
  easePath.selected = true;
    
  easePath.style = {
    strokeWidth: 1,
    strokeJoin: "round",
    strokeColor: "#00ff00",
    selectedColor: "#00ff00"
  };
  
  var segments = easePath.segments;
  var size = segments.length;
  var first = null;
  var last = null;
  var prev = null;
  
  for (var i = 0; i < size; i++) {
    
    var point = segments[i].point.subtract(offset);
    
    var node = {
      prev: prev,
      next: null,
      x: point.x / graphSize.width, 
      y: 1 - (point.y / graphSize.height)
    };
    
    if (!first) first = node;
    if (prev) prev.next = node;
    prev = node;
    last = node;
  }
  
  return { first, last, size };
}

function playAnimation() {
  
  tween1 && tween1.kill();
  tween2 && tween2.kill();
  plotPath && plotPath.remove();
  
  var points = easePoints();
  
  easePath.remove();
  
  var color = "#eee"
  
  plotPath = new paper.Path();
  plotPath.selected = false;
  
  plotPath.style = {
    strokeWidth: 3,
    strokeJoin: "round",
    strokeColor: color,
    selectedColor: color
  };
  
  plotPath.add(new paper.Point(offset.x, offset.y + graphSize.height));
  
  var obj = {
    y: offset.y + graphSize.height
  }
  
  var ease = new CustomEase(points);
  var delay = 0.25;
  
  box.position.y = 500;
  
  tween1 = TweenMax.to(box.position, tweenTime, { y: "-=" + tweenDelta, delay, ease });    
  
  tween2 = TweenMax.to(obj, tweenTime, {
    y: 50,
    delay, 
    ease,
    onUpdate: function() {
      var x = this.progress() * graphSize.width + offset.x;
      var y = obj.y;
      plotPath.add(new paper.Point(x, y))
    }
  });    
}


















              
            
!
999px

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