robinhouston/README.md

## README.md

      
    Raw
  

              README.md
            
          
    Clamp at each tick, rather than clamping the target value.
Click the circle to restart

  
## index.html
<!doctype html>
<html>
  <head>
    <title>D3 circle transitions</title>
    <script src="https://d3js.org/d3.v4.min.js"></script>
    <style>
      html, body, svg {
        width: 100%;
        height: 100%;
        margin: 0;
      }
      circle {
        fill: red;
        stroke: black;
        opacity: 0.7;
      }
    </style>
  </head>
  <body>
    <svg><circle cx="30" cy="20" r="5"/></svg>
    <script>
      var w = window.innerWidth,
          h = window.innerHeight,
          circle = d3.select("circle");

      function clamp(val, min, max) {
        return Math.min(max, Math.max(min, val));
      }

      function x(d) { return clamp(d.x, d.r + 1, w - d.r - 1); }
      function y(d) { return clamp(d.y, d.r + 1, h - d.r - 1); }
      function r(d) { return d.r; }

      circle.datum({ x: 10, y: 10, r: 80 })
        .transition().duration(3000)
        .tween("grow", function(d) {
          var int = d3.interpolateObject({
              x: this.getAttribute("cx"),
              y: this.getAttribute("cy"),
              r: this.getAttribute("r")
            }, d);

          return (t) => {
            this.setAttribute("cx", x(int(t)));
            this.setAttribute("cy", y(int(t)));
            this.setAttribute("r", r(int(t)));
          };
        });

      circle.node().onclick = function() { window.location.href = ""; };
    </script>
  </body>
</html>
	<!doctype html>
	<html>
	<head>
	<title>D3 circle transitions</title>
	<script src="https://d3js.org/d3.v4.min.js"></script>
	<style>
	html, body, svg {
	width: 100%;
	height: 100%;
	margin: 0;
	}
	circle {
	fill: red;
	stroke: black;
	opacity: 0.7;
	}
	</style>
	</head>
	<body>
	<svg><circle cx="30" cy="20" r="5"/></svg>
	<script>
	var w = window.innerWidth,
	h = window.innerHeight,
	circle = d3.select("circle");

	function clamp(val, min, max) {
	return Math.min(max, Math.max(min, val));
	}

	function x(d) { return clamp(d.x, d.r + 1, w - d.r - 1); }
	function y(d) { return clamp(d.y, d.r + 1, h - d.r - 1); }
	function r(d) { return d.r; }

	circle.datum({ x: 10, y: 10, r: 80 })
	.transition().duration(3000)
	.tween("grow", function(d) {
	var int = d3.interpolateObject({
	x: this.getAttribute("cx"),
	y: this.getAttribute("cy"),
	r: this.getAttribute("r")
	}, d);

	return (t) => {
	this.setAttribute("cx", x(int(t)));
	this.setAttribute("cy", y(int(t)));
	this.setAttribute("r", r(int(t)));
	};
	});

	circle.node().onclick = function() { window.location.href = ""; };
	</script>
	</body>
	</html>