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dragbox.js
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/**
* Copyright 2012-2018, Plotly, Inc.
* All rights reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
'use strict';
var d3 = require('d3');
var tinycolor = require('tinycolor2');
var supportsPassive = require('has-passive-events');
var Registry = require('../../registry');
var Lib = require('../../lib');
var svgTextUtils = require('../../lib/svg_text_utils');
var clearGlCanvases = require('../../lib/clear_gl_canvases');
var Color = require('../../components/color');
var Drawing = require('../../components/drawing');
var Fx = require('../../components/fx');
var setCursor = require('../../lib/setcursor');
var dragElement = require('../../components/dragelement');
var FROM_TL = require('../../constants/alignment').FROM_TL;
var Plots = require('../plots');
var doTicksSingle = require('./axes').doTicksSingle;
var getFromId = require('./axis_ids').getFromId;
var prepSelect = require('./select').prepSelect;
var clearSelect = require('./select').clearSelect;
var selectOnClick = require('./select').selectOnClick;
var scaleZoom = require('./scale_zoom');
var constants = require('./constants');
var MINDRAG = constants.MINDRAG;
var MINZOOM = constants.MINZOOM;
// flag for showing "doubleclick to zoom out" only at the beginning
var SHOWZOOMOUTTIP = true;
// dragBox: create an element to drag one or more axis ends
// inputs:
// plotinfo - which subplot are we making dragboxes on?
// x,y,w,h - left, top, width, height of the box
// ns - how does this drag the vertical axis?
// 'n' - top only
// 's' - bottom only
// 'ns' - top and bottom together, difference unchanged
// ew - same for horizontal axis
function makeDragBox(gd, plotinfo, x, y, w, h, ns, ew) {
// mouseDown stores ms of first mousedown event in the last
// DBLCLICKDELAY ms on the drag bars
// numClicks stores how many mousedowns have been seen
// within DBLCLICKDELAY so we can check for click or doubleclick events
// dragged stores whether a drag has occurred, so we don't have to
// redraw unnecessarily, ie if no move bigger than MINDRAG or MINZOOM px
var zoomlayer = gd._fullLayout._zoomlayer;
var isMainDrag = (ns + ew === 'nsew');
var singleEnd = (ns + ew).length === 1;
// main subplot x and y (i.e. found in plotinfo - the main ones)
var xa0, ya0;
// {ax._id: ax} hash objects
var xaHash, yaHash;
// xaHash/yaHash values (arrays)
var xaxes, yaxes;
// main axis offsets
var xs, ys;
// main axis lengths
var pw, ph;
// contains keys 'xaHash', 'yaHash', 'xaxes', and 'yaxes'
// which are the x/y {ax._id: ax} hash objects and their values
// for linked axis relative to this subplot
var links;
// set to ew/ns val when active, set to '' when inactive
var xActive, yActive;
// are all axes in this subplot are fixed?
var allFixedRanges;
// is subplot constrained?
var isSubplotConstrained;
// do we need to edit x/y ranges?
var editX, editY;
// graph-wide optimization flags
var hasScatterGl, hasOnlyLargeSploms, hasSplom, hasSVG;
function recomputeAxisLists() {
xa0 = plotinfo.xaxis;
ya0 = plotinfo.yaxis;
pw = xa0._length;
ph = ya0._length;
xs = xa0._offset;
ys = ya0._offset;
xaHash = {};
xaHash[xa0._id] = xa0;
yaHash = {};
yaHash[ya0._id] = ya0;
// if we're dragging two axes at once, also drag overlays
if(ns && ew) {
var overlays = plotinfo.overlays;
for(var i = 0; i < overlays.length; i++) {
var xa = overlays[i].xaxis;
xaHash[xa._id] = xa;
var ya = overlays[i].yaxis;
yaHash[ya._id] = ya;
}
}
xaxes = hashValues(xaHash);
yaxes = hashValues(yaHash);
xActive = isDirectionActive(xaxes, ew);
yActive = isDirectionActive(yaxes, ns);
allFixedRanges = !yActive && !xActive;
links = calcLinks(gd, xaHash, yaHash);
isSubplotConstrained = links.isSubplotConstrained;
editX = ew || isSubplotConstrained;
editY = ns || isSubplotConstrained;
var fullLayout = gd._fullLayout;
hasScatterGl = fullLayout._has('scattergl');
hasOnlyLargeSploms = fullLayout._hasOnlyLargeSploms;
hasSplom = hasOnlyLargeSploms || fullLayout._has('splom');
hasSVG = fullLayout._has('svg');
}
recomputeAxisLists();
var cursor = getDragCursor(yActive + xActive, gd._fullLayout.dragmode, isMainDrag);
var dragger = makeRectDragger(plotinfo, ns + ew + 'drag', cursor, x, y, w, h);
// still need to make the element if the axes are disabled
// but nuke its events (except for maindrag which needs them for hover)
// and stop there
if(allFixedRanges && !isMainDrag) {
dragger.onmousedown = null;
dragger.style.pointerEvents = 'none';
return dragger;
}
var dragOptions = {
element: dragger,
gd: gd,
plotinfo: plotinfo
};
dragOptions.prepFn = function(e, startX, startY) {
var dragModePrev = dragOptions.dragmode;
var dragModeNow = gd._fullLayout.dragmode;
if(dragModeNow !== dragModePrev) {
dragOptions.dragmode = dragModeNow;
}
recomputeAxisLists();
if(!allFixedRanges) {
if(isMainDrag) {
// main dragger handles all drag modes, and changes
// to pan (or to zoom if it already is pan) on shift
if(e.shiftKey) {
if(dragModeNow === 'pan') dragModeNow = 'zoom';
else if(!isSelectOrLasso(dragModeNow)) dragModeNow = 'pan';
}
else if(e.ctrlKey) {
dragModeNow = 'pan';
}
}
// all other draggers just pan
else dragModeNow = 'pan';
}
if(dragModeNow === 'lasso') dragOptions.minDrag = 1;
else dragOptions.minDrag = undefined;
if(isSelectOrLasso(dragModeNow)) {
dragOptions.xaxes = xaxes;
dragOptions.yaxes = yaxes;
// this attaches moveFn, clickFn, doneFn on dragOptions
prepSelect(e, startX, startY, dragOptions, dragModeNow);
} else {
dragOptions.clickFn = clickFn;
if(isSelectOrLasso(dragModePrev)) {
// TODO Fix potential bug
// Note: clearing / resetting selection state only happens, when user
// triggers at least one interaction in pan/zoom mode. Otherwise, the
// select/lasso outlines are deleted (in plots.js.cleanPlot) but the selection
// cache isn't cleared. So when the user switches back to select/lasso and
// 'adds to a selection' with Shift, the "old", seemingly removed outlines
// are redrawn again because the selection cache still holds their coordinates.
// However, this isn't easily solved, since plots.js would need
// to have a reference to the dragOptions object (which holds the
// selection cache).
clearAndResetSelect();
}
if(!allFixedRanges) {
if(dragModeNow === 'zoom') {
dragOptions.moveFn = zoomMove;
dragOptions.doneFn = zoomDone;
// zoomMove takes care of the threshold, but we need to
// minimize this so that constrained zoom boxes will flip
// orientation at the right place
dragOptions.minDrag = 1;
zoomPrep(e, startX, startY);
} else if(dragModeNow === 'pan') {
dragOptions.moveFn = plotDrag;
dragOptions.doneFn = dragTail;
}
}
}
};
function clearAndResetSelect() {
// clear selection polygon cache (if any)
dragOptions.plotinfo.selection = false;
// clear selection outlines
clearSelect(zoomlayer);
}
function clickFn(numClicks, evt) {
var clickmode = gd._fullLayout.clickmode;
removeZoombox(gd);
if(numClicks === 2 && !singleEnd) doubleClick();
if(isMainDrag) {
if(clickmode.indexOf('event') > -1) {
Fx.click(gd, evt, plotinfo.id);
}
if(clickmode.indexOf('select') > -1) {
selectOnClick(evt, gd, xaxes, yaxes, plotinfo.id, dragOptions);
}
}
else if(numClicks === 1 && singleEnd) {
var ax = ns ? ya0 : xa0,
end = (ns === 's' || ew === 'w') ? 0 : 1,
attrStr = ax._name + '.range[' + end + ']',
initialText = getEndText(ax, end),
hAlign = 'left',
vAlign = 'middle';
if(ax.fixedrange) return;
if(ns) {
vAlign = (ns === 'n') ? 'top' : 'bottom';
if(ax.side === 'right') hAlign = 'right';
}
else if(ew === 'e') hAlign = 'right';
if(gd._context.showAxisRangeEntryBoxes) {
d3.select(dragger)
.call(svgTextUtils.makeEditable, {
gd: gd,
immediate: true,
background: gd._fullLayout.paper_bgcolor,
text: String(initialText),
fill: ax.tickfont ? ax.tickfont.color : '#444',
horizontalAlign: hAlign,
verticalAlign: vAlign
})
.on('edit', function(text) {
var v = ax.d2r(text);
if(v !== undefined) {
Registry.call('relayout', gd, attrStr, v);
}
});
}
}
}
dragElement.init(dragOptions);
var x0,
y0,
box,
lum,
path0,
dimmed,
zoomMode,
zb,
corners;
// zoom takes over minDrag, so it also has to take over gd._dragged
var zoomDragged;
// collected changes to be made to the plot by relayout at the end
var updates = {};
function zoomPrep(e, startX, startY) {
var dragBBox = dragger.getBoundingClientRect();
x0 = startX - dragBBox.left;
y0 = startY - dragBBox.top;
box = {l: x0, r: x0, w: 0, t: y0, b: y0, h: 0};
lum = gd._hmpixcount ?
(gd._hmlumcount / gd._hmpixcount) :
tinycolor(gd._fullLayout.plot_bgcolor).getLuminance();
path0 = 'M0,0H' + pw + 'V' + ph + 'H0V0';
dimmed = false;
zoomMode = 'xy';
zoomDragged = false;
zb = makeZoombox(zoomlayer, lum, xs, ys, path0);
corners = makeCorners(zoomlayer, xs, ys);
}
function zoomMove(dx0, dy0) {
if(gd._transitioningWithDuration) {
return false;
}
var x1 = Math.max(0, Math.min(pw, dx0 + x0)),
y1 = Math.max(0, Math.min(ph, dy0 + y0)),
dx = Math.abs(x1 - x0),
dy = Math.abs(y1 - y0);
box.l = Math.min(x0, x1);
box.r = Math.max(x0, x1);
box.t = Math.min(y0, y1);
box.b = Math.max(y0, y1);
function noZoom() {
zoomMode = '';
box.r = box.l;
box.t = box.b;
corners.attr('d', 'M0,0Z');
}
if(isSubplotConstrained) {
if(dx > MINZOOM || dy > MINZOOM) {
zoomMode = 'xy';
if(dx / pw > dy / ph) {
dy = dx * ph / pw;
if(y0 > y1) box.t = y0 - dy;
else box.b = y0 + dy;
}
else {
dx = dy * pw / ph;
if(x0 > x1) box.l = x0 - dx;
else box.r = x0 + dx;
}
corners.attr('d', xyCorners(box));
}
else {
noZoom();
}
}
// look for small drags in one direction or the other,
// and only drag the other axis
else if(!yActive || dy < Math.min(Math.max(dx * 0.6, MINDRAG), MINZOOM)) {
if(dx < MINDRAG || !xActive) {
noZoom();
} else {
box.t = 0;
box.b = ph;
zoomMode = 'x';
corners.attr('d', xCorners(box, y0));
}
}
else if(!xActive || dx < Math.min(dy * 0.6, MINZOOM)) {
box.l = 0;
box.r = pw;
zoomMode = 'y';
corners.attr('d', yCorners(box, x0));
}
else {
zoomMode = 'xy';
corners.attr('d', xyCorners(box));
}
box.w = box.r - box.l;
box.h = box.b - box.t;
if(zoomMode) zoomDragged = true;
gd._dragged = zoomDragged;
updateZoombox(zb, corners, box, path0, dimmed, lum);
dimmed = true;
}
function zoomDone() {
// more strict than dragged, which allows you to come back to where you started
// and still count as dragged
if(Math.min(box.h, box.w) < MINDRAG * 2) {
return removeZoombox(gd);
}
// TODO: edit linked axes in zoomAxRanges and in dragTail
if(zoomMode === 'xy' || zoomMode === 'x') {
zoomAxRanges(xaxes, box.l / pw, box.r / pw, updates, links.xaxes);
}
if(zoomMode === 'xy' || zoomMode === 'y') {
zoomAxRanges(yaxes, (ph - box.b) / ph, (ph - box.t) / ph, updates, links.yaxes);
}
removeZoombox(gd);
dragTail();
showDoubleClickNotifier(gd);
}
// scroll zoom, on all draggers except corners
var scrollViewBox = [0, 0, pw, ph];
// wait a little after scrolling before redrawing
var redrawTimer = null;
var REDRAWDELAY = constants.REDRAWDELAY;
var mainplot = plotinfo.mainplot ? gd._fullLayout._plots[plotinfo.mainplot] : plotinfo;
function zoomWheel(e) {
// deactivate mousewheel scrolling on embedded graphs
// devs can override this with layout._enablescrollzoom,
// but _ ensures this setting won't leave their page
if(!gd._context.scrollZoom && !gd._fullLayout._enablescrollzoom) {
return;
}
clearAndResetSelect();
// If a transition is in progress, then disable any behavior:
if(gd._transitioningWithDuration) {
e.preventDefault();
e.stopPropagation();
return;
}
var pc = gd.querySelector('.plotly');
recomputeAxisLists();
// if the plot has scrollbars (more than a tiny excess)
// disable scrollzoom too.
if(pc.scrollHeight - pc.clientHeight > 10 ||
pc.scrollWidth - pc.clientWidth > 10) {
return;
}
clearTimeout(redrawTimer);
var wheelDelta = -e.deltaY;
if(!isFinite(wheelDelta)) wheelDelta = e.wheelDelta / 10;
if(!isFinite(wheelDelta)) {
Lib.log('Did not find wheel motion attributes: ', e);
return;
}
var zoom = Math.exp(-Math.min(Math.max(wheelDelta, -20), 20) / 200),
gbb = mainplot.draglayer.select('.nsewdrag')
.node().getBoundingClientRect(),
xfrac = (e.clientX - gbb.left) / gbb.width,
yfrac = (gbb.bottom - e.clientY) / gbb.height,
i;
function zoomWheelOneAxis(ax, centerFraction, zoom) {
if(ax.fixedrange) return;
var axRange = Lib.simpleMap(ax.range, ax.r2l),
v0 = axRange[0] + (axRange[1] - axRange[0]) * centerFraction;
function doZoom(v) { return ax.l2r(v0 + (v - v0) * zoom); }
ax.range = axRange.map(doZoom);
}
if(editX) {
// if we're only zooming this axis because of constraints,
// zoom it about the center
if(!ew) xfrac = 0.5;
for(i = 0; i < xaxes.length; i++) {
zoomWheelOneAxis(xaxes[i], xfrac, zoom);
}
scrollViewBox[2] *= zoom;
scrollViewBox[0] += scrollViewBox[2] * xfrac * (1 / zoom - 1);
}
if(editY) {
if(!ns) yfrac = 0.5;
for(i = 0; i < yaxes.length; i++) {
zoomWheelOneAxis(yaxes[i], yfrac, zoom);
}
scrollViewBox[3] *= zoom;
scrollViewBox[1] += scrollViewBox[3] * (1 - yfrac) * (1 / zoom - 1);
}
// viewbox redraw at first
updateSubplots(scrollViewBox);
ticksAndAnnotations(ns, ew);
// then replot after a delay to make sure
// no more scrolling is coming
redrawTimer = setTimeout(function() {
scrollViewBox = [0, 0, pw, ph];
dragTail();
}, REDRAWDELAY);
e.preventDefault();
return;
}
// everything but the corners gets wheel zoom
if(ns.length * ew.length !== 1) {
attachWheelEventHandler(dragger, zoomWheel);
}
// plotDrag: move the plot in response to a drag
function plotDrag(dx, dy) {
// If a transition is in progress, then disable any behavior:
if(gd._transitioningWithDuration) {
return;
}
if(xActive === 'ew' || yActive === 'ns') {
if(xActive) dragAxList(xaxes, dx);
if(yActive) dragAxList(yaxes, dy);
updateSubplots([xActive ? -dx : 0, yActive ? -dy : 0, pw, ph]);
ticksAndAnnotations(yActive, xActive);
return;
}
// dz: set a new value for one end (0 or 1) of an axis array axArray,
// and return a pixel shift for that end for the viewbox
// based on pixel drag distance d
// TODO: this makes (generally non-fatal) errors when you get
// near floating point limits
function dz(axArray, end, d) {
var otherEnd = 1 - end,
movedAx,
newLinearizedEnd;
for(var i = 0; i < axArray.length; i++) {
var axi = axArray[i];
if(axi.fixedrange) continue;
movedAx = axi;
newLinearizedEnd = axi._rl[otherEnd] +
(axi._rl[end] - axi._rl[otherEnd]) / dZoom(d / axi._length);
var newEnd = axi.l2r(newLinearizedEnd);
// if l2r comes back false or undefined, it means we've dragged off
// the end of valid ranges - so stop.
if(newEnd !== false && newEnd !== undefined) axi.range[end] = newEnd;
}
return movedAx._length * (movedAx._rl[end] - newLinearizedEnd) /
(movedAx._rl[end] - movedAx._rl[otherEnd]);
}
if(isSubplotConstrained && xActive && yActive) {
// dragging a corner of a constrained subplot:
// respect the fixed corner, but harmonize dx and dy
var dxySign = ((xActive === 'w') === (yActive === 'n')) ? 1 : -1;
var dxyFraction = (dx / pw + dxySign * dy / ph) / 2;
dx = dxyFraction * pw;
dy = dxySign * dxyFraction * ph;
}
if(xActive === 'w') dx = dz(xaxes, 0, dx);
else if(xActive === 'e') dx = dz(xaxes, 1, -dx);
else if(!xActive) dx = 0;
if(yActive === 'n') dy = dz(yaxes, 1, dy);
else if(yActive === 's') dy = dz(yaxes, 0, -dy);
else if(!yActive) dy = 0;
var x0 = (xActive === 'w') ? dx : 0;
var y0 = (yActive === 'n') ? dy : 0;
if(isSubplotConstrained) {
var i;
if(!xActive && yActive.length === 1) {
// dragging one end of the y axis of a constrained subplot
// scale the other axis the same about its middle
for(i = 0; i < xaxes.length; i++) {
xaxes[i].range = xaxes[i]._r.slice();
scaleZoom(xaxes[i], 1 - dy / ph);
}
dx = dy * pw / ph;
x0 = dx / 2;
}
if(!yActive && xActive.length === 1) {
for(i = 0; i < yaxes.length; i++) {
yaxes[i].range = yaxes[i]._r.slice();
scaleZoom(yaxes[i], 1 - dx / pw);
}
dy = dx * ph / pw;
y0 = dy / 2;
}
}
updateSubplots([x0, y0, pw - dx, ph - dy]);
ticksAndAnnotations(yActive, xActive);
}
// Draw ticks and annotations (and other components) when ranges change.
// Also records the ranges that have changed for use by update at the end.
function ticksAndAnnotations(ns, ew) {
var activeAxIds = [],
i;
function pushActiveAxIds(axList) {
for(i = 0; i < axList.length; i++) {
if(!axList[i].fixedrange) activeAxIds.push(axList[i]._id);
}
}
if(editX) {
pushActiveAxIds(xaxes);
pushActiveAxIds(links.xaxes);
}
if(editY) {
pushActiveAxIds(yaxes);
pushActiveAxIds(links.yaxes);
}
updates = {};
for(i = 0; i < activeAxIds.length; i++) {
var axId = activeAxIds[i];
doTicksSingle(gd, axId, true);
var ax = getFromId(gd, axId);
updates[ax._name + '.range[0]'] = ax.range[0];
updates[ax._name + '.range[1]'] = ax.range[1];
}
function redrawObjs(objArray, method, shortCircuit) {
for(i = 0; i < objArray.length; i++) {
var obji = objArray[i];
if((ew && activeAxIds.indexOf(obji.xref) !== -1) ||
(ns && activeAxIds.indexOf(obji.yref) !== -1)) {
method(gd, i);
// once is enough for images (which doesn't use the `i` arg anyway)
if(shortCircuit) return;
}
}
}
// annotations and shapes 'draw' method is slow,
// use the finer-grained 'drawOne' method instead
redrawObjs(gd._fullLayout.annotations || [], Registry.getComponentMethod('annotations', 'drawOne'));
redrawObjs(gd._fullLayout.shapes || [], Registry.getComponentMethod('shapes', 'drawOne'));
redrawObjs(gd._fullLayout.images || [], Registry.getComponentMethod('images', 'draw'), true);
}
function doubleClick() {
if(gd._transitioningWithDuration) return;
var doubleClickConfig = gd._context.doubleClick,
axList = (xActive ? xaxes : []).concat(yActive ? yaxes : []),
attrs = {};
var ax, i, rangeInitial;
// For reset+autosize mode:
// If *any* of the main axes is not at its initial range
// (or autoranged, if we have no initial range, to match the logic in
// doubleClickConfig === 'reset' below), we reset.
// If they are *all* at their initial ranges, then we autosize.
if(doubleClickConfig === 'reset+autosize') {
doubleClickConfig = 'autosize';
for(i = 0; i < axList.length; i++) {
ax = axList[i];
if((ax._rangeInitial && (
ax.range[0] !== ax._rangeInitial[0] ||
ax.range[1] !== ax._rangeInitial[1]
)) ||
(!ax._rangeInitial && !ax.autorange)
) {
doubleClickConfig = 'reset';
break;
}
}
}
if(doubleClickConfig === 'autosize') {
// don't set the linked axes here, so relayout marks them as shrinkable
// and we autosize just to the requested axis/axes
for(i = 0; i < axList.length; i++) {
ax = axList[i];
if(!ax.fixedrange) attrs[ax._name + '.autorange'] = true;
}
}
else if(doubleClickConfig === 'reset') {
// when we're resetting, reset all linked axes too, so we get back
// to the fully-auto-with-constraints situation
if(xActive || isSubplotConstrained) axList = axList.concat(links.xaxes);
if(yActive && !isSubplotConstrained) axList = axList.concat(links.yaxes);
if(isSubplotConstrained) {
if(!xActive) axList = axList.concat(xaxes);
else if(!yActive) axList = axList.concat(yaxes);
}
for(i = 0; i < axList.length; i++) {
ax = axList[i];
if(!ax._rangeInitial) {
attrs[ax._name + '.autorange'] = true;
}
else {
rangeInitial = ax._rangeInitial;
attrs[ax._name + '.range[0]'] = rangeInitial[0];
attrs[ax._name + '.range[1]'] = rangeInitial[1];
}
}
}
gd.emit('plotly_doubleclick', null);
Registry.call('relayout', gd, attrs);
}
// dragTail - finish a drag event with a redraw
function dragTail() {
// put the subplot viewboxes back to default (Because we're going to)
// be repositioning the data in the relayout. But DON'T call
// ticksAndAnnotations again - it's unnecessary and would overwrite `updates`
updateSubplots([0, 0, pw, ph]);
// since we may have been redrawing some things during the drag, we may have
// accumulated MathJax promises - wait for them before we relayout.
Lib.syncOrAsync([
Plots.previousPromises,
function() { Registry.call('relayout', gd, updates); }
], gd);
}
// x/y scaleFactor stash,
// minimizes number of per-point DOM updates in updateSubplots below
var xScaleFactorOld, yScaleFactorOld;
// updateSubplots - find all plot viewboxes that should be
// affected by this drag, and update them. look for all plots
// sharing an affected axis (including the one being dragged),
// includes also scattergl and splom logic.
function updateSubplots(viewBox) {
var fullLayout = gd._fullLayout;
var plotinfos = fullLayout._plots;
var subplots = fullLayout._subplots.cartesian;
var i, sp, xa, ya;
if(hasSplom || hasScatterGl) {
clearGlCanvases(gd);
}
if(hasSplom) {
Registry.subplotsRegistry.splom.drag(gd);
if(hasOnlyLargeSploms) return;
}
if(hasScatterGl) {
// loop over all subplots (w/o exceptions) here,
// as we cleared the gl canvases above
for(i = 0; i < subplots.length; i++) {
sp = plotinfos[subplots[i]];
xa = sp.xaxis;
ya = sp.yaxis;
var scene = sp._scene;
if(scene) {
// FIXME: possibly we could update axis internal _r and _rl here
var xrng = Lib.simpleMap(xa.range, xa.r2l);
var yrng = Lib.simpleMap(ya.range, ya.r2l);
scene.update({range: [xrng[0], yrng[0], xrng[1], yrng[1]]});
}
}
}
if(hasSVG) {
var xScaleFactor = viewBox[2] / xa0._length;
var yScaleFactor = viewBox[3] / ya0._length;
for(i = 0; i < subplots.length; i++) {
sp = plotinfos[subplots[i]];
xa = sp.xaxis;
ya = sp.yaxis;
var editX2 = editX && !xa.fixedrange && xaHash[xa._id];
var editY2 = editY && !ya.fixedrange && yaHash[ya._id];
var xScaleFactor2, yScaleFactor2;
var clipDx, clipDy;
if(editX2) {
xScaleFactor2 = xScaleFactor;
clipDx = ew ? viewBox[0] : getShift(xa, xScaleFactor2);
} else {
xScaleFactor2 = getLinkedScaleFactor(xa, xScaleFactor, yScaleFactor);
clipDx = scaleAndGetShift(xa, xScaleFactor2);
}
if(editY2) {
yScaleFactor2 = yScaleFactor;
clipDy = ns ? viewBox[1] : getShift(ya, yScaleFactor2);
} else {
yScaleFactor2 = getLinkedScaleFactor(ya, xScaleFactor, yScaleFactor);
clipDy = scaleAndGetShift(ya, yScaleFactor2);
}
// don't scale at all if neither axis is scalable here
if(!xScaleFactor2 && !yScaleFactor2) {
continue;
}
// but if only one is, reset the other axis scaling
if(!xScaleFactor2) xScaleFactor2 = 1;
if(!yScaleFactor2) yScaleFactor2 = 1;
var plotDx = xa._offset - clipDx / xScaleFactor2;
var plotDy = ya._offset - clipDy / yScaleFactor2;
// TODO could be more efficient here:
// setTranslate and setScale do a lot of extra work
// when working independently, should perhaps combine
// them into a single routine.
sp.clipRect
.call(Drawing.setTranslate, clipDx, clipDy)
.call(Drawing.setScale, xScaleFactor2, yScaleFactor2);
sp.plot
.call(Drawing.setTranslate, plotDx, plotDy)
.call(Drawing.setScale, 1 / xScaleFactor2, 1 / yScaleFactor2);
// apply an inverse scale to individual points to counteract
// the scale of the trace group.
// apply only when scale changes, as adjusting the scale of
// all the points can be expansive.
if(xScaleFactor2 !== xScaleFactorOld || yScaleFactor2 !== yScaleFactorOld) {
Drawing.setPointGroupScale(sp.zoomScalePts, xScaleFactor2, yScaleFactor2);
Drawing.setTextPointsScale(sp.zoomScaleTxt, xScaleFactor2, yScaleFactor2);
}
Drawing.hideOutsideRangePoints(sp.clipOnAxisFalseTraces, sp);
// update x/y scaleFactor stash
xScaleFactorOld = xScaleFactor2;
yScaleFactorOld = yScaleFactor2;
}
}
}
// Find the appropriate scaling for this axis, if it's linked to the
// dragged axes by constraints. 0 is special, it means this axis shouldn't
// ever be scaled (will be converted to 1 if the other axis is scaled)
function getLinkedScaleFactor(ax, xScaleFactor, yScaleFactor) {
if(ax.fixedrange) return 0;
if(editX && links.xaHash[ax._id]) {
return xScaleFactor;
}
if(editY && (isSubplotConstrained ? links.xaHash : links.yaHash)[ax._id]) {
return yScaleFactor;
}
return 0;
}
function scaleAndGetShift(ax, scaleFactor) {
if(scaleFactor) {
ax.range = ax._r.slice();
scaleZoom(ax, scaleFactor);
return getShift(ax, scaleFactor);
}
return 0;
}
function getShift(ax, scaleFactor) {
return ax._length * (1 - scaleFactor) * FROM_TL[ax.constraintoward || 'middle'];
}
return dragger;
}
function makeDragger(plotinfo, nodeName, dragClass, cursor) {
var dragger3 = Lib.ensureSingle(plotinfo.draglayer, nodeName, dragClass, function(s) {
s.classed('drag', true)
.style({fill: 'transparent', 'stroke-width': 0})
.attr('data-subplot', plotinfo.id);
});
dragger3.call(setCursor, cursor);
return dragger3.node();
}
function makeRectDragger(plotinfo, dragClass, cursor, x, y, w, h) {
var dragger = makeDragger(plotinfo, 'rect', dragClass, cursor);
d3.select(dragger).call(Drawing.setRect, x, y, w, h);
return dragger;
}
function isDirectionActive(axList, activeVal) {
for(var i = 0; i < axList.length; i++) {
if(!axList[i].fixedrange) return activeVal;
}
return '';
}
function getEndText(ax, end) {
var initialVal = ax.range[end],
diff = Math.abs(initialVal - ax.range[1 - end]),
dig;
// TODO: this should basically be ax.r2d but we're doing extra
// rounding here... can we clean up at all?
if(ax.type === 'date') {
return initialVal;
}
else if(ax.type === 'log') {
dig = Math.ceil(Math.max(0, -Math.log(diff) / Math.LN10)) + 3;
return d3.format('.' + dig + 'g')(Math.pow(10, initialVal));
}
else { // linear numeric (or category... but just show numbers here)
dig = Math.floor(Math.log(Math.abs(initialVal)) / Math.LN10) -
Math.floor(Math.log(diff) / Math.LN10) + 4;
return d3.format('.' + String(dig) + 'g')(initialVal);
}
}
function zoomAxRanges(axList, r0Fraction, r1Fraction, updates, linkedAxes) {
var i,
axi,
axRangeLinear0,
axRangeLinearSpan;
for(i = 0; i < axList.length; i++) {
axi = axList[i];
if(axi.fixedrange) continue;
axRangeLinear0 = axi._rl[0];
axRangeLinearSpan = axi._rl[1] - axRangeLinear0;
axi.range = [
axi.l2r(axRangeLinear0 + axRangeLinearSpan * r0Fraction),
axi.l2r(axRangeLinear0 + axRangeLinearSpan * r1Fraction)
];
updates[axi._name + '.range[0]'] = axi.range[0];
updates[axi._name + '.range[1]'] = axi.range[1];
}
// zoom linked axes about their centers
if(linkedAxes && linkedAxes.length) {
var linkedR0Fraction = (r0Fraction + (1 - r1Fraction)) / 2;
zoomAxRanges(linkedAxes, linkedR0Fraction, 1 - linkedR0Fraction, updates);
}
}
function dragAxList(axList, pix) {
for(var i = 0; i < axList.length; i++) {
var axi = axList[i];
if(!axi.fixedrange) {
axi.range = [
axi.l2r(axi._rl[0] - pix / axi._m),
axi.l2r(axi._rl[1] - pix / axi._m)
];
}
}
}
// common transform for dragging one end of an axis
// d>0 is compressing scale (cursor is over the plot,
// the axis end should move with the cursor)
// d<0 is expanding (cursor is off the plot, axis end moves
// nonlinearly so you can expand far)
function dZoom(d) {
return 1 - ((d >= 0) ? Math.min(d, 0.9) :
1 / (1 / Math.max(d, -0.3) + 3.222));
}
function getDragCursor(nsew, dragmode, isMainDrag) {
if(!nsew) return 'pointer';
if(nsew === 'nsew') {
// in this case here, clear cursor and
// use the cursor style set on <g .draglayer>
if(isMainDrag) return '';
if(dragmode === 'pan') return 'move';
return 'crosshair';
}
return nsew.toLowerCase() + '-resize';
}
function makeZoombox(zoomlayer, lum, xs, ys, path0) {
return zoomlayer.append('path')
.attr('class', 'zoombox')
.style({
'fill': lum > 0.2 ? 'rgba(0,0,0,0)' : 'rgba(255,255,255,0)',
'stroke-width': 0
})
.attr('transform', 'translate(' + xs + ', ' + ys + ')')
.attr('d', path0 + 'Z');
}
function makeCorners(zoomlayer, xs, ys) {
return zoomlayer.append('path')
.attr('class', 'zoombox-corners')
.style({
fill: Color.background,