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