Function mousewheel

explainshell/web/static/js/d3.v3.js:1181–1186

()

      }
    }
    function mousewheel() {
      if (!translate0) translate0 = location(d3.mouse(this));
      scaleTo(Math.pow(2, d3_behavior_zoomDelta() * .002) * scale);
      translateTo(d3.mouse(this), translate0);
      dispatch(event.of(this, arguments));
    }
    function mousemove() {
      translate0 = null;
    }