| 1 | import {dispatch} from "d3-dispatch";
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| 2 | import {dragDisable, dragEnable} from "d3-drag";
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| 3 | import {interpolateZoom} from "d3-interpolate";
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| 4 | import {select, pointer} from "d3-selection";
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| 5 | import {interrupt} from "d3-transition";
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| 6 | import constant from "./constant.js";
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| 7 | import ZoomEvent from "./event.js";
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| 8 | import {Transform, identity} from "./transform.js";
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| 9 | import noevent, {nopropagation} from "./noevent.js";
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| 10 |
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| 11 | // Ignore right-click, since that should open the context menu.
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| 12 | // except for pinch-to-zoom, which is sent as a wheel+ctrlKey event
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| 13 | function defaultFilter(event) {
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| 14 | return (!event.ctrlKey || event.type === 'wheel') && !event.button;
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| 15 | }
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| 16 |
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| 17 | function defaultExtent() {
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| 18 | var e = this;
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| 19 | if (e instanceof SVGElement) {
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| 20 | e = e.ownerSVGElement || e;
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| 21 | if (e.hasAttribute("viewBox")) {
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| 22 | e = e.viewBox.baseVal;
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| 23 | return [[e.x, e.y], [e.x + e.width, e.y + e.height]];
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| 24 | }
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| 25 | return [[0, 0], [e.width.baseVal.value, e.height.baseVal.value]];
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| 26 | }
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| 27 | return [[0, 0], [e.clientWidth, e.clientHeight]];
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| 28 | }
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| 29 |
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| 30 | function defaultTransform() {
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| 31 | return this.__zoom || identity;
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| 32 | }
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| 33 |
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| 34 | function defaultWheelDelta(event) {
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| 35 | return -event.deltaY * (event.deltaMode === 1 ? 0.05 : event.deltaMode ? 1 : 0.002) * (event.ctrlKey ? 10 : 1);
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| 36 | }
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| 37 |
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| 38 | function defaultTouchable() {
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| 39 | return navigator.maxTouchPoints || ("ontouchstart" in this);
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| 40 | }
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| 41 |
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| 42 | function defaultConstrain(transform, extent, translateExtent) {
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| 43 | var dx0 = transform.invertX(extent[0][0]) - translateExtent[0][0],
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| 44 | dx1 = transform.invertX(extent[1][0]) - translateExtent[1][0],
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| 45 | dy0 = transform.invertY(extent[0][1]) - translateExtent[0][1],
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| 46 | dy1 = transform.invertY(extent[1][1]) - translateExtent[1][1];
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| 47 | return transform.translate(
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| 48 | dx1 > dx0 ? (dx0 + dx1) / 2 : Math.min(0, dx0) || Math.max(0, dx1),
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| 49 | dy1 > dy0 ? (dy0 + dy1) / 2 : Math.min(0, dy0) || Math.max(0, dy1)
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| 50 | );
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| 51 | }
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| 52 |
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| 53 | export default function() {
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| 54 | var filter = defaultFilter,
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| 55 | extent = defaultExtent,
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| 56 | constrain = defaultConstrain,
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| 57 | wheelDelta = defaultWheelDelta,
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| 58 | touchable = defaultTouchable,
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| 59 | scaleExtent = [0, Infinity],
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| 60 | translateExtent = [[-Infinity, -Infinity], [Infinity, Infinity]],
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| 61 | duration = 250,
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| 62 | interpolate = interpolateZoom,
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| 63 | listeners = dispatch("start", "zoom", "end"),
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| 64 | touchstarting,
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| 65 | touchfirst,
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| 66 | touchending,
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| 67 | touchDelay = 500,
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| 68 | wheelDelay = 150,
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| 69 | clickDistance2 = 0,
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| 70 | tapDistance = 10;
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| 71 |
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| 72 | function zoom(selection) {
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| 73 | selection
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| 74 | .property("__zoom", defaultTransform)
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| 75 | .on("wheel.zoom", wheeled, {passive: false})
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| 76 | .on("mousedown.zoom", mousedowned)
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| 77 | .on("dblclick.zoom", dblclicked)
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| 78 | .filter(touchable)
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| 79 | .on("touchstart.zoom", touchstarted)
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| 80 | .on("touchmove.zoom", touchmoved)
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| 81 | .on("touchend.zoom touchcancel.zoom", touchended)
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| 82 | .style("-webkit-tap-highlight-color", "rgba(0,0,0,0)");
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| 83 | }
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| 84 |
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| 85 | zoom.transform = function(collection, transform, point, event) {
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| 86 | var selection = collection.selection ? collection.selection() : collection;
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| 87 | selection.property("__zoom", defaultTransform);
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| 88 | if (collection !== selection) {
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| 89 | schedule(collection, transform, point, event);
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| 90 | } else {
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| 91 | selection.interrupt().each(function() {
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| 92 | gesture(this, arguments)
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| 93 | .event(event)
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| 94 | .start()
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| 95 | .zoom(null, typeof transform === "function" ? transform.apply(this, arguments) : transform)
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| 96 | .end();
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| 97 | });
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| 98 | }
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| 99 | };
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| 100 |
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| 101 | zoom.scaleBy = function(selection, k, p, event) {
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| 102 | zoom.scaleTo(selection, function() {
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| 103 | var k0 = this.__zoom.k,
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| 104 | k1 = typeof k === "function" ? k.apply(this, arguments) : k;
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| 105 | return k0 * k1;
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| 106 | }, p, event);
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| 107 | };
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| 108 |
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| 109 | zoom.scaleTo = function(selection, k, p, event) {
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| 110 | zoom.transform(selection, function() {
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| 111 | var e = extent.apply(this, arguments),
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| 112 | t0 = this.__zoom,
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| 113 | p0 = p == null ? centroid(e) : typeof p === "function" ? p.apply(this, arguments) : p,
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| 114 | p1 = t0.invert(p0),
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| 115 | k1 = typeof k === "function" ? k.apply(this, arguments) : k;
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| 116 | return constrain(translate(scale(t0, k1), p0, p1), e, translateExtent);
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| 117 | }, p, event);
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| 118 | };
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| 119 |
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| 120 | zoom.translateBy = function(selection, x, y, event) {
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| 121 | zoom.transform(selection, function() {
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| 122 | return constrain(this.__zoom.translate(
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| 123 | typeof x === "function" ? x.apply(this, arguments) : x,
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| 124 | typeof y === "function" ? y.apply(this, arguments) : y
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| 125 | ), extent.apply(this, arguments), translateExtent);
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| 126 | }, null, event);
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| 127 | };
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| 128 |
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| 129 | zoom.translateTo = function(selection, x, y, p, event) {
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| 130 | zoom.transform(selection, function() {
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| 131 | var e = extent.apply(this, arguments),
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| 132 | t = this.__zoom,
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| 133 | p0 = p == null ? centroid(e) : typeof p === "function" ? p.apply(this, arguments) : p;
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| 134 | return constrain(identity.translate(p0[0], p0[1]).scale(t.k).translate(
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| 135 | typeof x === "function" ? -x.apply(this, arguments) : -x,
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| 136 | typeof y === "function" ? -y.apply(this, arguments) : -y
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| 137 | ), e, translateExtent);
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| 138 | }, p, event);
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| 139 | };
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| 140 |
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| 141 | function scale(transform, k) {
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| 142 | k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], k));
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| 143 | return k === transform.k ? transform : new Transform(k, transform.x, transform.y);
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| 144 | }
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| 145 |
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| 146 | function translate(transform, p0, p1) {
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| 147 | var x = p0[0] - p1[0] * transform.k, y = p0[1] - p1[1] * transform.k;
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| 148 | return x === transform.x && y === transform.y ? transform : new Transform(transform.k, x, y);
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| 149 | }
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| 150 |
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| 151 | function centroid(extent) {
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| 152 | return [(+extent[0][0] + +extent[1][0]) / 2, (+extent[0][1] + +extent[1][1]) / 2];
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| 153 | }
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| 154 |
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| 155 | function schedule(transition, transform, point, event) {
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| 156 | transition
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| 157 | .on("start.zoom", function() { gesture(this, arguments).event(event).start(); })
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| 158 | .on("interrupt.zoom end.zoom", function() { gesture(this, arguments).event(event).end(); })
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| 159 | .tween("zoom", function() {
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| 160 | var that = this,
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| 161 | args = arguments,
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| 162 | g = gesture(that, args).event(event),
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| 163 | e = extent.apply(that, args),
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| 164 | p = point == null ? centroid(e) : typeof point === "function" ? point.apply(that, args) : point,
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| 165 | w = Math.max(e[1][0] - e[0][0], e[1][1] - e[0][1]),
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| 166 | a = that.__zoom,
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| 167 | b = typeof transform === "function" ? transform.apply(that, args) : transform,
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| 168 | i = interpolate(a.invert(p).concat(w / a.k), b.invert(p).concat(w / b.k));
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| 169 | return function(t) {
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| 170 | if (t === 1) t = b; // Avoid rounding error on end.
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| 171 | else { var l = i(t), k = w / l[2]; t = new Transform(k, p[0] - l[0] * k, p[1] - l[1] * k); }
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| 172 | g.zoom(null, t);
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| 173 | };
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| 174 | });
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| 175 | }
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| 176 |
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| 177 | function gesture(that, args, clean) {
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| 178 | return (!clean && that.__zooming) || new Gesture(that, args);
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| 179 | }
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| 180 |
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| 181 | function Gesture(that, args) {
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| 182 | this.that = that;
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| 183 | this.args = args;
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| 184 | this.active = 0;
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| 185 | this.sourceEvent = null;
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| 186 | this.extent = extent.apply(that, args);
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| 187 | this.taps = 0;
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| 188 | }
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| 189 |
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| 190 | Gesture.prototype = {
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| 191 | event: function(event) {
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| 192 | if (event) this.sourceEvent = event;
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| 193 | return this;
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| 194 | },
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| 195 | start: function() {
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| 196 | if (++this.active === 1) {
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| 197 | this.that.__zooming = this;
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| 198 | this.emit("start");
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| 199 | }
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| 200 | return this;
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| 201 | },
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| 202 | zoom: function(key, transform) {
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| 203 | if (this.mouse && key !== "mouse") this.mouse[1] = transform.invert(this.mouse[0]);
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| 204 | if (this.touch0 && key !== "touch") this.touch0[1] = transform.invert(this.touch0[0]);
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| 205 | if (this.touch1 && key !== "touch") this.touch1[1] = transform.invert(this.touch1[0]);
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| 206 | this.that.__zoom = transform;
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| 207 | this.emit("zoom");
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| 208 | return this;
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| 209 | },
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| 210 | end: function() {
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| 211 | if (--this.active === 0) {
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| 212 | delete this.that.__zooming;
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| 213 | this.emit("end");
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| 214 | }
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| 215 | return this;
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| 216 | },
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| 217 | emit: function(type) {
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| 218 | var d = select(this.that).datum();
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| 219 | listeners.call(
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| 220 | type,
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| 221 | this.that,
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| 222 | new ZoomEvent(type, {
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| 223 | sourceEvent: this.sourceEvent,
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| 224 | target: zoom,
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| 225 | type,
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| 226 | transform: this.that.__zoom,
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| 227 | dispatch: listeners
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| 228 | }),
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| 229 | d
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| 230 | );
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| 231 | }
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| 232 | };
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| 233 |
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| 234 | function wheeled(event, ...args) {
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| 235 | if (!filter.apply(this, arguments)) return;
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| 236 | var g = gesture(this, args).event(event),
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| 237 | t = this.__zoom,
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| 238 | k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], t.k * Math.pow(2, wheelDelta.apply(this, arguments)))),
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| 239 | p = pointer(event);
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| 240 |
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| 241 | // If the mouse is in the same location as before, reuse it.
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| 242 | // If there were recent wheel events, reset the wheel idle timeout.
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| 243 | if (g.wheel) {
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| 244 | if (g.mouse[0][0] !== p[0] || g.mouse[0][1] !== p[1]) {
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| 245 | g.mouse[1] = t.invert(g.mouse[0] = p);
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| 246 | }
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| 247 | clearTimeout(g.wheel);
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| 248 | }
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| 249 |
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| 250 | // If this wheel event won’t trigger a transform change, ignore it.
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| 251 | else if (t.k === k) return;
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| 252 |
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| 253 | // Otherwise, capture the mouse point and location at the start.
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| 254 | else {
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| 255 | g.mouse = [p, t.invert(p)];
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| 256 | interrupt(this);
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| 257 | g.start();
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| 258 | }
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| 259 |
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| 260 | noevent(event);
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| 261 | g.wheel = setTimeout(wheelidled, wheelDelay);
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| 262 | g.zoom("mouse", constrain(translate(scale(t, k), g.mouse[0], g.mouse[1]), g.extent, translateExtent));
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| 263 |
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| 264 | function wheelidled() {
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| 265 | g.wheel = null;
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| 266 | g.end();
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| 267 | }
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| 268 | }
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| 269 |
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| 270 | function mousedowned(event, ...args) {
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| 271 | if (touchending || !filter.apply(this, arguments)) return;
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| 272 | var currentTarget = event.currentTarget,
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| 273 | g = gesture(this, args, true).event(event),
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| 274 | v = select(event.view).on("mousemove.zoom", mousemoved, true).on("mouseup.zoom", mouseupped, true),
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| 275 | p = pointer(event, currentTarget),
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| 276 | x0 = event.clientX,
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| 277 | y0 = event.clientY;
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| 278 |
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| 279 | dragDisable(event.view);
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| 280 | nopropagation(event);
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| 281 | g.mouse = [p, this.__zoom.invert(p)];
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| 282 | interrupt(this);
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| 283 | g.start();
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| 284 |
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| 285 | function mousemoved(event) {
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| 286 | noevent(event);
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| 287 | if (!g.moved) {
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| 288 | var dx = event.clientX - x0, dy = event.clientY - y0;
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| 289 | g.moved = dx * dx + dy * dy > clickDistance2;
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| 290 | }
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| 291 | g.event(event)
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| 292 | .zoom("mouse", constrain(translate(g.that.__zoom, g.mouse[0] = pointer(event, currentTarget), g.mouse[1]), g.extent, translateExtent));
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| 293 | }
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| 294 |
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| 295 | function mouseupped(event) {
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| 296 | v.on("mousemove.zoom mouseup.zoom", null);
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| 297 | dragEnable(event.view, g.moved);
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| 298 | noevent(event);
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| 299 | g.event(event).end();
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| 300 | }
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| 301 | }
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| 302 |
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| 303 | function dblclicked(event, ...args) {
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| 304 | if (!filter.apply(this, arguments)) return;
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| 305 | var t0 = this.__zoom,
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| 306 | p0 = pointer(event.changedTouches ? event.changedTouches[0] : event, this),
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| 307 | p1 = t0.invert(p0),
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| 308 | k1 = t0.k * (event.shiftKey ? 0.5 : 2),
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| 309 | t1 = constrain(translate(scale(t0, k1), p0, p1), extent.apply(this, args), translateExtent);
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| 310 |
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| 311 | noevent(event);
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| 312 | if (duration > 0) select(this).transition().duration(duration).call(schedule, t1, p0, event);
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| 313 | else select(this).call(zoom.transform, t1, p0, event);
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| 314 | }
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| 315 |
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| 316 | function touchstarted(event, ...args) {
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| 317 | if (!filter.apply(this, arguments)) return;
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| 318 | var touches = event.touches,
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| 319 | n = touches.length,
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| 320 | g = gesture(this, args, event.changedTouches.length === n).event(event),
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| 321 | started, i, t, p;
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| 322 |
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| 323 | nopropagation(event);
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| 324 | for (i = 0; i < n; ++i) {
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| 325 | t = touches[i], p = pointer(t, this);
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| 326 | p = [p, this.__zoom.invert(p), t.identifier];
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| 327 | if (!g.touch0) g.touch0 = p, started = true, g.taps = 1 + !!touchstarting;
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| 328 | else if (!g.touch1 && g.touch0[2] !== p[2]) g.touch1 = p, g.taps = 0;
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| 329 | }
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| 330 |
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| 331 | if (touchstarting) touchstarting = clearTimeout(touchstarting);
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| 332 |
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| 333 | if (started) {
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| 334 | if (g.taps < 2) touchfirst = p[0], touchstarting = setTimeout(function() { touchstarting = null; }, touchDelay);
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| 335 | interrupt(this);
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| 336 | g.start();
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| 337 | }
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| 338 | }
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| 339 |
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| 340 | function touchmoved(event, ...args) {
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| 341 | if (!this.__zooming) return;
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| 342 | var g = gesture(this, args).event(event),
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| 343 | touches = event.changedTouches,
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| 344 | n = touches.length, i, t, p, l;
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| 345 |
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| 346 | noevent(event);
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| 347 | for (i = 0; i < n; ++i) {
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| 348 | t = touches[i], p = pointer(t, this);
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| 349 | if (g.touch0 && g.touch0[2] === t.identifier) g.touch0[0] = p;
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| 350 | else if (g.touch1 && g.touch1[2] === t.identifier) g.touch1[0] = p;
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| 351 | }
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| 352 | t = g.that.__zoom;
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| 353 | if (g.touch1) {
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| 354 | var p0 = g.touch0[0], l0 = g.touch0[1],
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| 355 | p1 = g.touch1[0], l1 = g.touch1[1],
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| 356 | dp = (dp = p1[0] - p0[0]) * dp + (dp = p1[1] - p0[1]) * dp,
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| 357 | dl = (dl = l1[0] - l0[0]) * dl + (dl = l1[1] - l0[1]) * dl;
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| 358 | t = scale(t, Math.sqrt(dp / dl));
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| 359 | p = [(p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2];
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| 360 | l = [(l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2];
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| 361 | }
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| 362 | else if (g.touch0) p = g.touch0[0], l = g.touch0[1];
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| 363 | else return;
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| 364 |
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| 365 | g.zoom("touch", constrain(translate(t, p, l), g.extent, translateExtent));
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| 366 | }
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| 367 |
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| 368 | function touchended(event, ...args) {
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| 369 | if (!this.__zooming) return;
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| 370 | var g = gesture(this, args).event(event),
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| 371 | touches = event.changedTouches,
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| 372 | n = touches.length, i, t;
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| 373 |
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| 374 | nopropagation(event);
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| 375 | if (touchending) clearTimeout(touchending);
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| 376 | touchending = setTimeout(function() { touchending = null; }, touchDelay);
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| 377 | for (i = 0; i < n; ++i) {
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| 378 | t = touches[i];
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| 379 | if (g.touch0 && g.touch0[2] === t.identifier) delete g.touch0;
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| 380 | else if (g.touch1 && g.touch1[2] === t.identifier) delete g.touch1;
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| 381 | }
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| 382 | if (g.touch1 && !g.touch0) g.touch0 = g.touch1, delete g.touch1;
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| 383 | if (g.touch0) g.touch0[1] = this.__zoom.invert(g.touch0[0]);
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| 384 | else {
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| 385 | g.end();
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| 386 | // If this was a dbltap, reroute to the (optional) dblclick.zoom handler.
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| 387 | if (g.taps === 2) {
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| 388 | t = pointer(t, this);
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| 389 | if (Math.hypot(touchfirst[0] - t[0], touchfirst[1] - t[1]) < tapDistance) {
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| 390 | var p = select(this).on("dblclick.zoom");
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| 391 | if (p) p.apply(this, arguments);
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| 392 | }
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| 393 | }
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| 394 | }
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| 395 | }
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| 396 |
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| 397 | zoom.wheelDelta = function(_) {
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| 398 | return arguments.length ? (wheelDelta = typeof _ === "function" ? _ : constant(+_), zoom) : wheelDelta;
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| 399 | };
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| 400 |
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| 401 | zoom.filter = function(_) {
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| 402 | return arguments.length ? (filter = typeof _ === "function" ? _ : constant(!!_), zoom) : filter;
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| 403 | };
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| 404 |
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| 405 | zoom.touchable = function(_) {
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| 406 | return arguments.length ? (touchable = typeof _ === "function" ? _ : constant(!!_), zoom) : touchable;
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| 407 | };
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| 408 |
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| 409 | zoom.extent = function(_) {
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| 410 | return arguments.length ? (extent = typeof _ === "function" ? _ : constant([[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]]), zoom) : extent;
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| 411 | };
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| 412 |
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| 413 | zoom.scaleExtent = function(_) {
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| 414 | return arguments.length ? (scaleExtent[0] = +_[0], scaleExtent[1] = +_[1], zoom) : [scaleExtent[0], scaleExtent[1]];
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| 415 | };
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| 416 |
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| 417 | zoom.translateExtent = function(_) {
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| 418 | return arguments.length ? (translateExtent[0][0] = +_[0][0], translateExtent[1][0] = +_[1][0], translateExtent[0][1] = +_[0][1], translateExtent[1][1] = +_[1][1], zoom) : [[translateExtent[0][0], translateExtent[0][1]], [translateExtent[1][0], translateExtent[1][1]]];
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| 419 | };
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| 420 |
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| 421 | zoom.constrain = function(_) {
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| 422 | return arguments.length ? (constrain = _, zoom) : constrain;
|
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| 423 | };
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| 424 |
|
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| 425 | zoom.duration = function(_) {
|
|---|
| 426 | return arguments.length ? (duration = +_, zoom) : duration;
|
|---|
| 427 | };
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| 428 |
|
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| 429 | zoom.interpolate = function(_) {
|
|---|
| 430 | return arguments.length ? (interpolate = _, zoom) : interpolate;
|
|---|
| 431 | };
|
|---|
| 432 |
|
|---|
| 433 | zoom.on = function() {
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|---|
| 434 | var value = listeners.on.apply(listeners, arguments);
|
|---|
| 435 | return value === listeners ? zoom : value;
|
|---|
| 436 | };
|
|---|
| 437 |
|
|---|
| 438 | zoom.clickDistance = function(_) {
|
|---|
| 439 | return arguments.length ? (clickDistance2 = (_ = +_) * _, zoom) : Math.sqrt(clickDistance2);
|
|---|
| 440 | };
|
|---|
| 441 |
|
|---|
| 442 | zoom.tapDistance = function(_) {
|
|---|
| 443 | return arguments.length ? (tapDistance = +_, zoom) : tapDistance;
|
|---|
| 444 | };
|
|---|
| 445 |
|
|---|
| 446 | return zoom;
|
|---|
| 447 | }
|
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