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import {dispatch} from "d3-dispatch"; |
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import {dragDisable, dragEnable} from "d3-drag"; |
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import {interpolateZoom} from "d3-interpolate"; |
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import {select, pointer} from "d3-selection"; |
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import {interrupt} from "d3-transition"; |
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import constant from "./constant.js"; |
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import ZoomEvent from "./event.js"; |
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import {Transform, identity} from "./transform.js"; |
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import noevent, {nopropagation} from "./noevent.js"; |
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function defaultFilter(event) { |
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return (!event.ctrlKey || event.type === 'wheel') && !event.button; |
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} |
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function defaultExtent() { |
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var e = this; |
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if (e instanceof SVGElement) { |
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e = e.ownerSVGElement || e; |
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if (e.hasAttribute("viewBox")) { |
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e = e.viewBox.baseVal; |
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return [[e.x, e.y], [e.x + e.width, e.y + e.height]]; |
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} |
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return [[0, 0], [e.width.baseVal.value, e.height.baseVal.value]]; |
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} |
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return [[0, 0], [e.clientWidth, e.clientHeight]]; |
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} |
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function defaultTransform() { |
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return this.__zoom || identity; |
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} |
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function defaultWheelDelta(event) { |
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return -event.deltaY * (event.deltaMode === 1 ? 0.05 : event.deltaMode ? 1 : 0.002) * (event.ctrlKey ? 10 : 1); |
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} |
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function defaultTouchable() { |
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return navigator.maxTouchPoints || ("ontouchstart" in this); |
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} |
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function defaultConstrain(transform, extent, translateExtent) { |
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var dx0 = transform.invertX(extent[0][0]) - translateExtent[0][0], |
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dx1 = transform.invertX(extent[1][0]) - translateExtent[1][0], |
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dy0 = transform.invertY(extent[0][1]) - translateExtent[0][1], |
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dy1 = transform.invertY(extent[1][1]) - translateExtent[1][1]; |
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return transform.translate( |
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dx1 > dx0 ? (dx0 + dx1) / 2 : Math.min(0, dx0) || Math.max(0, dx1), |
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dy1 > dy0 ? (dy0 + dy1) / 2 : Math.min(0, dy0) || Math.max(0, dy1) |
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); |
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} |
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export default function() { |
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var filter = defaultFilter, |
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extent = defaultExtent, |
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constrain = defaultConstrain, |
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wheelDelta = defaultWheelDelta, |
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touchable = defaultTouchable, |
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scaleExtent = [0, Infinity], |
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translateExtent = [[-Infinity, -Infinity], [Infinity, Infinity]], |
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duration = 250, |
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interpolate = interpolateZoom, |
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listeners = dispatch("start", "zoom", "end"), |
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touchstarting, |
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touchfirst, |
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touchending, |
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touchDelay = 500, |
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wheelDelay = 150, |
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clickDistance2 = 0, |
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tapDistance = 10; |
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function zoom(selection) { |
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selection |
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.property("__zoom", defaultTransform) |
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.on("wheel.zoom", wheeled, {passive: false}) |
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.on("mousedown.zoom", mousedowned) |
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.on("dblclick.zoom", dblclicked) |
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.filter(touchable) |
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.on("touchstart.zoom", touchstarted) |
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.on("touchmove.zoom", touchmoved) |
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.on("touchend.zoom touchcancel.zoom", touchended) |
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.style("-webkit-tap-highlight-color", "rgba(0,0,0,0)"); |
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} |
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zoom.transform = function(collection, transform, point, event) { |
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var selection = collection.selection ? collection.selection() : collection; |
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selection.property("__zoom", defaultTransform); |
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if (collection !== selection) { |
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schedule(collection, transform, point, event); |
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} else { |
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selection.interrupt().each(function() { |
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gesture(this, arguments) |
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.event(event) |
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.start() |
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.zoom(null, typeof transform === "function" ? transform.apply(this, arguments) : transform) |
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.end(); |
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}); |
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} |
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}; |
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zoom.scaleBy = function(selection, k, p, event) { |
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zoom.scaleTo(selection, function() { |
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var k0 = this.__zoom.k, |
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k1 = typeof k === "function" ? k.apply(this, arguments) : k; |
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return k0 * k1; |
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}, p, event); |
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}; |
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zoom.scaleTo = function(selection, k, p, event) { |
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zoom.transform(selection, function() { |
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var e = extent.apply(this, arguments), |
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t0 = this.__zoom, |
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p0 = p == null ? centroid(e) : typeof p === "function" ? p.apply(this, arguments) : p, |
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p1 = t0.invert(p0), |
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k1 = typeof k === "function" ? k.apply(this, arguments) : k; |
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return constrain(translate(scale(t0, k1), p0, p1), e, translateExtent); |
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}, p, event); |
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}; |
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zoom.translateBy = function(selection, x, y, event) { |
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zoom.transform(selection, function() { |
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return constrain(this.__zoom.translate( |
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typeof x === "function" ? x.apply(this, arguments) : x, |
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typeof y === "function" ? y.apply(this, arguments) : y |
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), extent.apply(this, arguments), translateExtent); |
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}, null, event); |
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}; |
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zoom.translateTo = function(selection, x, y, p, event) { |
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zoom.transform(selection, function() { |
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var e = extent.apply(this, arguments), |
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t = this.__zoom, |
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p0 = p == null ? centroid(e) : typeof p === "function" ? p.apply(this, arguments) : p; |
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return constrain(identity.translate(p0[0], p0[1]).scale(t.k).translate( |
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typeof x === "function" ? -x.apply(this, arguments) : -x, |
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typeof y === "function" ? -y.apply(this, arguments) : -y |
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), e, translateExtent); |
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}, p, event); |
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}; |
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function scale(transform, k) { |
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k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], k)); |
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return k === transform.k ? transform : new Transform(k, transform.x, transform.y); |
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} |
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function translate(transform, p0, p1) { |
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var x = p0[0] - p1[0] * transform.k, y = p0[1] - p1[1] * transform.k; |
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return x === transform.x && y === transform.y ? transform : new Transform(transform.k, x, y); |
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} |
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function centroid(extent) { |
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return [(+extent[0][0] + +extent[1][0]) / 2, (+extent[0][1] + +extent[1][1]) / 2]; |
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} |
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function schedule(transition, transform, point, event) { |
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transition |
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.on("start.zoom", function() { gesture(this, arguments).event(event).start(); }) |
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.on("interrupt.zoom end.zoom", function() { gesture(this, arguments).event(event).end(); }) |
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.tween("zoom", function() { |
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var that = this, |
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args = arguments, |
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g = gesture(that, args).event(event), |
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e = extent.apply(that, args), |
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p = point == null ? centroid(e) : typeof point === "function" ? point.apply(that, args) : point, |
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w = Math.max(e[1][0] - e[0][0], e[1][1] - e[0][1]), |
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a = that.__zoom, |
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b = typeof transform === "function" ? transform.apply(that, args) : transform, |
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i = interpolate(a.invert(p).concat(w / a.k), b.invert(p).concat(w / b.k)); |
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return function(t) { |
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if (t === 1) t = b; |
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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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g.zoom(null, t); |
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}; |
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}); |
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} |
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function gesture(that, args, clean) { |
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return (!clean && that.__zooming) || new Gesture(that, args); |
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} |
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function Gesture(that, args) { |
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this.that = that; |
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this.args = args; |
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this.active = 0; |
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this.sourceEvent = null; |
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this.extent = extent.apply(that, args); |
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this.taps = 0; |
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} |
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Gesture.prototype = { |
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event: function(event) { |
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if (event) this.sourceEvent = event; |
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return this; |
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}, |
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start: function() { |
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if (++this.active === 1) { |
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this.that.__zooming = this; |
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this.emit("start"); |
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} |
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return this; |
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}, |
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zoom: function(key, transform) { |
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if (this.mouse && key !== "mouse") this.mouse[1] = transform.invert(this.mouse[0]); |
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if (this.touch0 && key !== "touch") this.touch0[1] = transform.invert(this.touch0[0]); |
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if (this.touch1 && key !== "touch") this.touch1[1] = transform.invert(this.touch1[0]); |
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this.that.__zoom = transform; |
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this.emit("zoom"); |
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return this; |
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}, |
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end: function() { |
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if (--this.active === 0) { |
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delete this.that.__zooming; |
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this.emit("end"); |
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} |
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return this; |
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}, |
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emit: function(type) { |
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var d = select(this.that).datum(); |
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listeners.call( |
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type, |
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this.that, |
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new ZoomEvent(type, { |
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sourceEvent: this.sourceEvent, |
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target: zoom, |
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type, |
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transform: this.that.__zoom, |
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dispatch: listeners |
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}), |
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d |
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); |
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} |
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}; |
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function wheeled(event, ...args) { |
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if (!filter.apply(this, arguments)) return; |
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var g = gesture(this, args).event(event), |
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t = this.__zoom, |
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k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], t.k * Math.pow(2, wheelDelta.apply(this, arguments)))), |
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p = pointer(event); |
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if (g.wheel) { |
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if (g.mouse[0][0] !== p[0] || g.mouse[0][1] !== p[1]) { |
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g.mouse[1] = t.invert(g.mouse[0] = p); |
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} |
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clearTimeout(g.wheel); |
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} |
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else if (t.k === k) return; |
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else { |
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g.mouse = [p, t.invert(p)]; |
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interrupt(this); |
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g.start(); |
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} |
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noevent(event); |
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g.wheel = setTimeout(wheelidled, wheelDelay); |
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g.zoom("mouse", constrain(translate(scale(t, k), g.mouse[0], g.mouse[1]), g.extent, translateExtent)); |
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function wheelidled() { |
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g.wheel = null; |
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g.end(); |
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} |
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} |
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function mousedowned(event, ...args) { |
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if (touchending || !filter.apply(this, arguments)) return; |
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var currentTarget = event.currentTarget, |
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g = gesture(this, args, true).event(event), |
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v = select(event.view).on("mousemove.zoom", mousemoved, true).on("mouseup.zoom", mouseupped, true), |
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p = pointer(event, currentTarget), |
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x0 = event.clientX, |
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y0 = event.clientY; |
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dragDisable(event.view); |
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nopropagation(event); |
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g.mouse = [p, this.__zoom.invert(p)]; |
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interrupt(this); |
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g.start(); |
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function mousemoved(event) { |
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noevent(event); |
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if (!g.moved) { |
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var dx = event.clientX - x0, dy = event.clientY - y0; |
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g.moved = dx * dx + dy * dy > clickDistance2; |
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} |
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g.event(event) |
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.zoom("mouse", constrain(translate(g.that.__zoom, g.mouse[0] = pointer(event, currentTarget), g.mouse[1]), g.extent, translateExtent)); |
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} |
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function mouseupped(event) { |
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v.on("mousemove.zoom mouseup.zoom", null); |
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dragEnable(event.view, g.moved); |
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noevent(event); |
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g.event(event).end(); |
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} |
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} |
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function dblclicked(event, ...args) { |
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if (!filter.apply(this, arguments)) return; |
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var t0 = this.__zoom, |
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p0 = pointer(event.changedTouches ? event.changedTouches[0] : event, this), |
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p1 = t0.invert(p0), |
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k1 = t0.k * (event.shiftKey ? 0.5 : 2), |
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t1 = constrain(translate(scale(t0, k1), p0, p1), extent.apply(this, args), translateExtent); |
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noevent(event); |
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if (duration > 0) select(this).transition().duration(duration).call(schedule, t1, p0, event); |
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else select(this).call(zoom.transform, t1, p0, event); |
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} |
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function touchstarted(event, ...args) { |
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if (!filter.apply(this, arguments)) return; |
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var touches = event.touches, |
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n = touches.length, |
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g = gesture(this, args, event.changedTouches.length === n).event(event), |
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started, i, t, p; |
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nopropagation(event); |
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for (i = 0; i < n; ++i) { |
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t = touches[i], p = pointer(t, this); |
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p = [p, this.__zoom.invert(p), t.identifier]; |
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if (!g.touch0) g.touch0 = p, started = true, g.taps = 1 + !!touchstarting; |
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else if (!g.touch1 && g.touch0[2] !== p[2]) g.touch1 = p, g.taps = 0; |
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} |
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if (touchstarting) touchstarting = clearTimeout(touchstarting); |
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if (started) { |
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if (g.taps < 2) touchfirst = p[0], touchstarting = setTimeout(function() { touchstarting = null; }, touchDelay); |
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interrupt(this); |
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g.start(); |
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} |
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} |
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function touchmoved(event, ...args) { |
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if (!this.__zooming) return; |
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var g = gesture(this, args).event(event), |
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touches = event.changedTouches, |
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n = touches.length, i, t, p, l; |
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noevent(event); |
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for (i = 0; i < n; ++i) { |
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t = touches[i], p = pointer(t, this); |
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if (g.touch0 && g.touch0[2] === t.identifier) g.touch0[0] = p; |
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else if (g.touch1 && g.touch1[2] === t.identifier) g.touch1[0] = p; |
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} |
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t = g.that.__zoom; |
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if (g.touch1) { |
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var p0 = g.touch0[0], l0 = g.touch0[1], |
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p1 = g.touch1[0], l1 = g.touch1[1], |
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dp = (dp = p1[0] - p0[0]) * dp + (dp = p1[1] - p0[1]) * dp, |
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dl = (dl = l1[0] - l0[0]) * dl + (dl = l1[1] - l0[1]) * dl; |
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t = scale(t, Math.sqrt(dp / dl)); |
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p = [(p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2]; |
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l = [(l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2]; |
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} |
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else if (g.touch0) p = g.touch0[0], l = g.touch0[1]; |
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else return; |
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g.zoom("touch", constrain(translate(t, p, l), g.extent, translateExtent)); |
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} |
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function touchended(event, ...args) { |
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if (!this.__zooming) return; |
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var g = gesture(this, args).event(event), |
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touches = event.changedTouches, |
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n = touches.length, i, t; |
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nopropagation(event); |
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if (touchending) clearTimeout(touchending); |
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touchending = setTimeout(function() { touchending = null; }, touchDelay); |
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for (i = 0; i < n; ++i) { |
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t = touches[i]; |
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if (g.touch0 && g.touch0[2] === t.identifier) delete g.touch0; |
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else if (g.touch1 && g.touch1[2] === t.identifier) delete g.touch1; |
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} |
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if (g.touch1 && !g.touch0) g.touch0 = g.touch1, delete g.touch1; |
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if (g.touch0) g.touch0[1] = this.__zoom.invert(g.touch0[0]); |
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else { |
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g.end(); |
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if (g.taps === 2) { |
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t = pointer(t, this); |
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if (Math.hypot(touchfirst[0] - t[0], touchfirst[1] - t[1]) < tapDistance) { |
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var p = select(this).on("dblclick.zoom"); |
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if (p) p.apply(this, arguments); |
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} |
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} |
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} |
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} |
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zoom.wheelDelta = function(_) { |
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return arguments.length ? (wheelDelta = typeof _ === "function" ? _ : constant(+_), zoom) : wheelDelta; |
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}; |
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zoom.filter = function(_) { |
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return arguments.length ? (filter = typeof _ === "function" ? _ : constant(!!_), zoom) : filter; |
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}; |
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zoom.touchable = function(_) { |
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return arguments.length ? (touchable = typeof _ === "function" ? _ : constant(!!_), zoom) : touchable; |
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}; |
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zoom.extent = function(_) { |
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return arguments.length ? (extent = typeof _ === "function" ? _ : constant([[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]]), zoom) : extent; |
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}; |
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zoom.scaleExtent = function(_) { |
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return arguments.length ? (scaleExtent[0] = +_[0], scaleExtent[1] = +_[1], zoom) : [scaleExtent[0], scaleExtent[1]]; |
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}; |
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zoom.translateExtent = function(_) { |
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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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}; |
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zoom.constrain = function(_) { |
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return arguments.length ? (constrain = _, zoom) : constrain; |
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}; |
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zoom.duration = function(_) { |
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return arguments.length ? (duration = +_, zoom) : duration; |
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}; |
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zoom.interpolate = function(_) { |
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return arguments.length ? (interpolate = _, zoom) : interpolate; |
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}; |
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zoom.on = function() { |
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var value = listeners.on.apply(listeners, arguments); |
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return value === listeners ? zoom : value; |
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}; |
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zoom.clickDistance = function(_) { |
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return arguments.length ? (clickDistance2 = (_ = +_) * _, zoom) : Math.sqrt(clickDistance2); |
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}; |
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zoom.tapDistance = function(_) { |
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return arguments.length ? (tapDistance = +_, zoom) : tapDistance; |
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}; |
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return zoom; |
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} |
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