SVG技术:旋转运动的三角

上面这个动画效果是SVG+JS实现的,如果你看看实现它们的源代码,会发现非常的简单。

<!DOCTYPE html>
<meta charset="utf-8">
<style>

rect {
  fill: #fff;
  stroke: #000;
}

</style>
<svg  >
  <defs>
    <clipPath id="clip-upper">
      <rect   x="-480" y="-305"></rect>
    </clipPath>
    <clipPath id="clip-lower">
      <rect   x="-480" y="0"></rect>
    </clipPath>
  </defs>
  <g clip-path="url(#clip-upper)" transform="translate(480,305)"></g>
  <g clip-path="url(#clip-lower)" transform="translate(480,305)"></g>
</svg>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var width = 960,
    height = 500,
    triangleSize = 400,
    squareCount = 71,
    squareSize = 90,
    speed = .08;

var square = d3.selectAll("g")
  .selectAll("g")
    .data(function(d, i) { return i ? [0, 1, 2] : [2, 0, 1]; })
  .enter().append("g")
    .attr("transform", function(i) { return "rotate(" + (i * 120 + 60) + ")translate(0," + -triangleSize / Math.sqrt(12) + ")"; })
  .selectAll("rect")
    .data(d3.range(squareCount))
  .enter().append("rect")
    .datum(function(i) { return i / squareCount; })
    .attr({width: squareSize, height: squareSize, x: -squareSize / 2, y: -squareSize / 2});

d3.timer(function(elapsed) {
  square
      .attr("transform", function(t) { return "translate(" + (t - .5) * triangleSize + ",0)rotate(" + (t * 120 + elapsed * speed) + ")"; });
});

</script>
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