// https://d3js.org/d3-zoom/ Version 1.5.0. Copyright 2017 Mike Bostock.
(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('d3-dispatch'), require('d3-drag'), require('d3-interpolate'), require('d3-selection'), require('d3-transition')) :
	typeof define === 'function' && define.amd ? define(['exports', 'd3-dispatch', 'd3-drag', 'd3-interpolate', 'd3-selection', 'd3-transition'], factory) :
	(factory((global.d3 = global.d3 || {}),global.d3,global.d3,global.d3,global.d3,global.d3));
}(this, (function (exports,d3Dispatch,d3Drag,d3Interpolate,d3Selection,d3Transition) { 'use strict';

var constant = function(x) {
  return function() {
    return x;
  };
};

function ZoomEvent(target, type, transform) {
  this.target = target;
  this.type = type;
  this.transform = transform;
}

function Transform(k, x, y) {
  this.k = k;
  this.x = x;
  this.y = y;
}

Transform.prototype = {
  constructor: Transform,
  scale: function(k) {
    return k === 1 ? this : new Transform(this.k * k, this.x, this.y);
  },
  translate: function(x, y) {
    return x === 0 & y === 0 ? this : new Transform(this.k, this.x + this.k * x, this.y + this.k * y);
  },
  apply: function(point) {
    return [point[0] * this.k + this.x, point[1] * this.k + this.y];
  },
  applyX: function(x) {
    return x * this.k + this.x;
  },
  applyY: function(y) {
    return y * this.k + this.y;
  },
  invert: function(location) {
    return [(location[0] - this.x) / this.k, (location[1] - this.y) / this.k];
  },
  invertX: function(x) {
    return (x - this.x) / this.k;
  },
  invertY: function(y) {
    return (y - this.y) / this.k;
  },
  rescaleX: function(x) {
    return x.copy().domain(x.range().map(this.invertX, this).map(x.invert, x));
  },
  rescaleY: function(y) {
    return y.copy().domain(y.range().map(this.invertY, this).map(y.invert, y));
  },
  toString: function() {
    return "translate(" + this.x + "," + this.y + ") scale(" + this.k + ")";
  }
};

var identity = new Transform(1, 0, 0);

transform.prototype = Transform.prototype;

function transform(node) {
  return node.__zoom || identity;
}

function nopropagation() {
  d3Selection.event.stopImmediatePropagation();
}

var noevent = function() {
  d3Selection.event.preventDefault();
  d3Selection.event.stopImmediatePropagation();
};

// Ignore right-click, since that should open the context menu.
function defaultFilter() {
  return !d3Selection.event.button;
}

function defaultExtent() {
  var e = this, w, h;
  if (e instanceof SVGElement) {
    e = e.ownerSVGElement || e;
    w = e.width.baseVal.value;
    h = e.height.baseVal.value;
  } else {
    w = e.clientWidth;
    h = e.clientHeight;
  }
  return [[0, 0], [w, h]];
}

function defaultTransform() {
  return this.__zoom || identity;
}

function defaultWheelDelta() {
  return -d3Selection.event.deltaY * (d3Selection.event.deltaMode ? 120 : 1) / 500;
}

function touchable() {
  return "ontouchstart" in this;
}

var zoom = function() {
  var filter = defaultFilter,
      extent = defaultExtent,
      wheelDelta = defaultWheelDelta,
      k0 = 0,
      k1 = Infinity,
      x0 = -k1,
      x1 = k1,
      y0 = x0,
      y1 = x1,
      duration = 250,
      interpolate = d3Interpolate.interpolateZoom,
      gestures = [],
      listeners = d3Dispatch.dispatch("start", "zoom", "end"),
      touchstarting,
      touchending,
      touchDelay = 500,
      wheelDelay = 150,
      clickDistance2 = 0;

  function zoom(selection) {
    selection
        .property("__zoom", defaultTransform)
        .on("wheel.zoom", wheeled)
        .on("mousedown.zoom", mousedowned)
        .on("dblclick.zoom", dblclicked)
      .filter(touchable)
        .on("touchstart.zoom", touchstarted)
        .on("touchmove.zoom", touchmoved)
        .on("touchend.zoom touchcancel.zoom", touchended)
        .style("touch-action", "none")
        .style("-webkit-tap-highlight-color", "rgba(0,0,0,0)");
  }

  zoom.transform = function(collection, transform$$1) {
    var selection = collection.selection ? collection.selection() : collection;
    selection.property("__zoom", defaultTransform);
    if (collection !== selection) {
      schedule(collection, transform$$1);
    } else {
      selection.interrupt().each(function() {
        gesture(this, arguments)
            .start()
            .zoom(null, typeof transform$$1 === "function" ? transform$$1.apply(this, arguments) : transform$$1)
            .end();
      });
    }
  };

  zoom.scaleBy = function(selection, k) {
    zoom.scaleTo(selection, function() {
      var k0 = this.__zoom.k,
          k1 = typeof k === "function" ? k.apply(this, arguments) : k;
      return k0 * k1;
    });
  };

  zoom.scaleTo = function(selection, k) {
    zoom.transform(selection, function() {
      var e = extent.apply(this, arguments),
          t0 = this.__zoom,
          p0 = centroid(e),
          p1 = t0.invert(p0),
          k1 = typeof k === "function" ? k.apply(this, arguments) : k;
      return constrain(translate(scale(t0, k1), p0, p1), e);
    });
  };

  zoom.translateBy = function(selection, x, y) {
    zoom.transform(selection, function() {
      return constrain(this.__zoom.translate(
        typeof x === "function" ? x.apply(this, arguments) : x,
        typeof y === "function" ? y.apply(this, arguments) : y
      ), extent.apply(this, arguments));
    });
  };

  zoom.translateTo = function(selection, x, y) {
    zoom.transform(selection, function() {
      var e = extent.apply(this, arguments),
          t = this.__zoom,
          p = centroid(e);
      return constrain(identity.translate(p[0], p[1]).scale(t.k).translate(
        typeof x === "function" ? -x.apply(this, arguments) : -x,
        typeof y === "function" ? -y.apply(this, arguments) : -y
      ), e);
    });
  };

  function scale(transform$$1, k) {
    k = Math.max(k0, Math.min(k1, k));
    return k === transform$$1.k ? transform$$1 : new Transform(k, transform$$1.x, transform$$1.y);
  }

  function translate(transform$$1, p0, p1) {
    var x = p0[0] - p1[0] * transform$$1.k, y = p0[1] - p1[1] * transform$$1.k;
    return x === transform$$1.x && y === transform$$1.y ? transform$$1 : new Transform(transform$$1.k, x, y);
  }

  function constrain(transform$$1, extent) {
    var dx0 = transform$$1.invertX(extent[0][0]) - x0,
        dx1 = transform$$1.invertX(extent[1][0]) - x1,
        dy0 = transform$$1.invertY(extent[0][1]) - y0,
        dy1 = transform$$1.invertY(extent[1][1]) - y1;
    return transform$$1.translate(
      dx1 > dx0 ? (dx0 + dx1) / 2 : Math.min(0, dx0) || Math.max(0, dx1),
      dy1 > dy0 ? (dy0 + dy1) / 2 : Math.min(0, dy0) || Math.max(0, dy1)
    );
  }

  function centroid(extent) {
    return [(+extent[0][0] + +extent[1][0]) / 2, (+extent[0][1] + +extent[1][1]) / 2];
  }

  function schedule(transition, transform$$1, center) {
    transition
        .on("start.zoom", function() { gesture(this, arguments).start(); })
        .on("interrupt.zoom end.zoom", function() { gesture(this, arguments).end(); })
        .tween("zoom", function() {
          var that = this,
              args = arguments,
              g = gesture(that, args),
              e = extent.apply(that, args),
              p = center || centroid(e),
              w = Math.max(e[1][0] - e[0][0], e[1][1] - e[0][1]),
              a = that.__zoom,
              b = typeof transform$$1 === "function" ? transform$$1.apply(that, args) : transform$$1,
              i = interpolate(a.invert(p).concat(w / a.k), b.invert(p).concat(w / b.k));
          return function(t) {
            if (t === 1) t = b; // Avoid rounding error on end.
            else { var l = i(t), k = w / l[2]; t = new Transform(k, p[0] - l[0] * k, p[1] - l[1] * k); }
            g.zoom(null, t);
          };
        });
  }

  function gesture(that, args) {
    for (var i = 0, n = gestures.length, g; i < n; ++i) {
      if ((g = gestures[i]).that === that) {
        return g;
      }
    }
    return new Gesture(that, args);
  }

  function Gesture(that, args) {
    this.that = that;
    this.args = args;
    this.index = -1;
    this.active = 0;
    this.extent = extent.apply(that, args);
  }

  Gesture.prototype = {
    start: function() {
      if (++this.active === 1) {
        this.index = gestures.push(this) - 1;
        this.emit("start");
      }
      return this;
    },
    zoom: function(key, transform$$1) {
      if (this.mouse && key !== "mouse") this.mouse[1] = transform$$1.invert(this.mouse[0]);
      if (this.touch0 && key !== "touch") this.touch0[1] = transform$$1.invert(this.touch0[0]);
      if (this.touch1 && key !== "touch") this.touch1[1] = transform$$1.invert(this.touch1[0]);
      this.that.__zoom = transform$$1;
      this.emit("zoom");
      return this;
    },
    end: function() {
      if (--this.active === 0) {
        gestures.splice(this.index, 1);
        this.index = -1;
        this.emit("end");
      }
      return this;
    },
    emit: function(type) {
      d3Selection.customEvent(new ZoomEvent(zoom, type, this.that.__zoom), listeners.apply, listeners, [type, this.that, this.args]);
    }
  };

  function wheeled() {
    if (!filter.apply(this, arguments)) return;
    var g = gesture(this, arguments),
        t = this.__zoom,
        k = Math.max(k0, Math.min(k1, t.k * Math.pow(2, wheelDelta.apply(this, arguments)))),
        p = d3Selection.mouse(this);

    // If the mouse is in the same location as before, reuse it.
    // If there were recent wheel events, reset the wheel idle timeout.
    if (g.wheel) {
      if (g.mouse[0][0] !== p[0] || g.mouse[0][1] !== p[1]) {
        g.mouse[1] = t.invert(g.mouse[0] = p);
      }
      clearTimeout(g.wheel);
    }

    // If this wheel event won’t trigger a transform change, ignore it.
    else if (t.k === k) return;

    // Otherwise, capture the mouse point and location at the start.
    else {
      g.mouse = [p, t.invert(p)];
      d3Transition.interrupt(this);
      g.start();
    }

    noevent();
    g.wheel = setTimeout(wheelidled, wheelDelay);
    g.zoom("mouse", constrain(translate(scale(t, k), g.mouse[0], g.mouse[1]), g.extent));

    function wheelidled() {
      g.wheel = null;
      g.end();
    }
  }

  function mousedowned() {
    if (touchending || !filter.apply(this, arguments)) return;
    var g = gesture(this, arguments),
        v = d3Selection.select(d3Selection.event.view).on("mousemove.zoom", mousemoved, true).on("mouseup.zoom", mouseupped, true),
        p = d3Selection.mouse(this),
        x0 = d3Selection.event.clientX,
        y0 = d3Selection.event.clientY;

    d3Drag.dragDisable(d3Selection.event.view);
    nopropagation();
    g.mouse = [p, this.__zoom.invert(p)];
    d3Transition.interrupt(this);
    g.start();

    function mousemoved() {
      noevent();
      if (!g.moved) {
        var dx = d3Selection.event.clientX - x0, dy = d3Selection.event.clientY - y0;
        g.moved = dx * dx + dy * dy > clickDistance2;
      }
      g.zoom("mouse", constrain(translate(g.that.__zoom, g.mouse[0] = d3Selection.mouse(g.that), g.mouse[1]), g.extent));
    }

    function mouseupped() {
      v.on("mousemove.zoom mouseup.zoom", null);
      d3Drag.dragEnable(d3Selection.event.view, g.moved);
      noevent();
      g.end();
    }
  }

  function dblclicked() {
    if (!filter.apply(this, arguments)) return;
    var t0 = this.__zoom,
        p0 = d3Selection.mouse(this),
        p1 = t0.invert(p0),
        k1 = t0.k * (d3Selection.event.shiftKey ? 0.5 : 2),
        t1 = constrain(translate(scale(t0, k1), p0, p1), extent.apply(this, arguments));

    noevent();
    if (duration > 0) d3Selection.select(this).transition().duration(duration).call(schedule, t1, p0);
    else d3Selection.select(this).call(zoom.transform, t1);
  }

  function touchstarted() {
    if (!filter.apply(this, arguments)) return;
    var g = gesture(this, arguments),
        touches = d3Selection.event.changedTouches,
        started,
        n = touches.length, i, t, p;

    nopropagation();
    for (i = 0; i < n; ++i) {
      t = touches[i], p = d3Selection.touch(this, touches, t.identifier);
      p = [p, this.__zoom.invert(p), t.identifier];
      if (!g.touch0) g.touch0 = p, started = true;
      else if (!g.touch1) g.touch1 = p;
    }

    // If this is a dbltap, reroute to the (optional) dblclick.zoom handler.
    if (touchstarting) {
      touchstarting = clearTimeout(touchstarting);
      if (!g.touch1) {
        g.end();
        p = d3Selection.select(this).on("dblclick.zoom");
        if (p) p.apply(this, arguments);
        return;
      }
    }

    if (started) {
      touchstarting = setTimeout(function() { touchstarting = null; }, touchDelay);
      d3Transition.interrupt(this);
      g.start();
    }
  }

  function touchmoved() {
    var g = gesture(this, arguments),
        touches = d3Selection.event.changedTouches,
        n = touches.length, i, t, p, l;

    noevent();
    if (touchstarting) touchstarting = clearTimeout(touchstarting);
    for (i = 0; i < n; ++i) {
      t = touches[i], p = d3Selection.touch(this, touches, t.identifier);
      if (g.touch0 && g.touch0[2] === t.identifier) g.touch0[0] = p;
      else if (g.touch1 && g.touch1[2] === t.identifier) g.touch1[0] = p;
    }
    t = g.that.__zoom;
    if (g.touch1) {
      var p0 = g.touch0[0], l0 = g.touch0[1],
          p1 = g.touch1[0], l1 = g.touch1[1],
          dp = (dp = p1[0] - p0[0]) * dp + (dp = p1[1] - p0[1]) * dp,
          dl = (dl = l1[0] - l0[0]) * dl + (dl = l1[1] - l0[1]) * dl;
      t = scale(t, Math.sqrt(dp / dl));
      p = [(p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2];
      l = [(l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2];
    }
    else if (g.touch0) p = g.touch0[0], l = g.touch0[1];
    else return;
    g.zoom("touch", constrain(translate(t, p, l), g.extent));
  }

  function touchended() {
    var g = gesture(this, arguments),
        touches = d3Selection.event.changedTouches,
        n = touches.length, i, t;

    nopropagation();
    if (touchending) clearTimeout(touchending);
    touchending = setTimeout(function() { touchending = null; }, touchDelay);
    for (i = 0; i < n; ++i) {
      t = touches[i];
      if (g.touch0 && g.touch0[2] === t.identifier) delete g.touch0;
      else if (g.touch1 && g.touch1[2] === t.identifier) delete g.touch1;
    }
    if (g.touch1 && !g.touch0) g.touch0 = g.touch1, delete g.touch1;
    if (g.touch0) g.touch0[1] = this.__zoom.invert(g.touch0[0]);
    else g.end();
  }

  zoom.wheelDelta = function(_) {
    return arguments.length ? (wheelDelta = typeof _ === "function" ? _ : constant(+_), zoom) : wheelDelta;
  };

  zoom.filter = function(_) {
    return arguments.length ? (filter = typeof _ === "function" ? _ : constant(!!_), zoom) : filter;
  };

  zoom.extent = function(_) {
    return arguments.length ? (extent = typeof _ === "function" ? _ : constant([[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]]), zoom) : extent;
  };

  zoom.scaleExtent = function(_) {
    return arguments.length ? (k0 = +_[0], k1 = +_[1], zoom) : [k0, k1];
  };

  zoom.translateExtent = function(_) {
    return arguments.length ? (x0 = +_[0][0], x1 = +_[1][0], y0 = +_[0][1], y1 = +_[1][1], zoom) : [[x0, y0], [x1, y1]];
  };

  zoom.duration = function(_) {
    return arguments.length ? (duration = +_, zoom) : duration;
  };

  zoom.interpolate = function(_) {
    return arguments.length ? (interpolate = _, zoom) : interpolate;
  };

  zoom.on = function() {
    var value = listeners.on.apply(listeners, arguments);
    return value === listeners ? zoom : value;
  };

  zoom.clickDistance = function(_) {
    return arguments.length ? (clickDistance2 = (_ = +_) * _, zoom) : Math.sqrt(clickDistance2);
  };

  return zoom;
};

exports.zoom = zoom;
exports.zoomTransform = transform;
exports.zoomIdentity = identity;

Object.defineProperty(exports, '__esModule', { value: true });

})));
