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polar.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 Registry = require('../../registry');
var Lib = require('../../lib');
var Color = require('../../components/color');
var Drawing = require('../../components/drawing');
var Plots = require('../plots');
var setConvertCartesian = require('../cartesian/set_convert');
var setConvertPolar = require('./set_convert');
var doAutoRange = require('../cartesian/autorange').doAutoRange;
var doTicksSingle = require('../cartesian/axes').doTicksSingle;
var dragBox = require('../cartesian/dragbox');
var dragElement = require('../../components/dragelement');
var Fx = require('../../components/fx');
var Titles = require('../../components/titles');
var prepSelect = require('../cartesian/select').prepSelect;
var clearSelect = require('../cartesian/select').clearSelect;
var setCursor = require('../../lib/setcursor');
var polygonTester = require('../../lib/polygon').tester;
var MID_SHIFT = require('../../constants/alignment').MID_SHIFT;
var constants = require('./constants');
var _ = Lib._;
var deg2rad = Lib.deg2rad;
var rad2deg = Lib.rad2deg;
var wrap360 = Lib.wrap360;
var wrap180 = Lib.wrap180;
var isFullCircle = Lib.isFullCircle;
var isAngleInsideSector = Lib.isAngleInsideSector;
var angleDelta = Lib.angleDelta;
function Polar(gd, id) {
this.id = id;
this.gd = gd;
this._hasClipOnAxisFalse = null;
this.vangles = null;
this.radialAxisAngle = null;
this.traceHash = {};
this.layers = {};
this.clipPaths = {};
this.clipIds = {};
this.viewInitial = {};
var fullLayout = gd._fullLayout;
var clipIdBase = 'clip' + fullLayout._uid + id;
this.clipIds.forTraces = clipIdBase + '-for-traces';
this.clipPaths.forTraces = fullLayout._clips.append('clipPath')
.attr('id', this.clipIds.forTraces);
this.clipPaths.forTraces.append('path');
this.framework = fullLayout._polarlayer.append('g')
.attr('class', id);
// unfortunately, we have to keep track of some axis tick settings
// so that we don't have to call doTicksSingle with its special redraw flag
this.radialTickLayout = null;
this.angularTickLayout = null;
}
var proto = Polar.prototype;
module.exports = function createPolar(gd, id) {
return new Polar(gd, id);
};
proto.plot = function(polarCalcData, fullLayout) {
var _this = this;
var polarLayout = fullLayout[_this.id];
_this._hasClipOnAxisFalse = false;
for(var i = 0; i < polarCalcData.length; i++) {
var trace = polarCalcData[i][0].trace;
if(trace.cliponaxis === false) {
_this._hasClipOnAxisFalse = true;
break;
}
}
_this.updateLayers(fullLayout, polarLayout);
_this.updateLayout(fullLayout, polarLayout);
Plots.generalUpdatePerTraceModule(_this.gd, _this, polarCalcData, polarLayout);
_this.updateFx(fullLayout, polarLayout);
};
proto.updateLayers = function(fullLayout, polarLayout) {
var _this = this;
var layers = _this.layers;
var radialLayout = polarLayout.radialaxis;
var angularLayout = polarLayout.angularaxis;
var layerNames = constants.layerNames;
var frontPlotIndex = layerNames.indexOf('frontplot');
var layerData = layerNames.slice(0, frontPlotIndex);
var isAngularAxisBelowTraces = angularLayout.layer === 'below traces';
var isRadialAxisBelowTraces = radialLayout.layer === 'below traces';
if(isAngularAxisBelowTraces) layerData.push('angular-axis');
if(isRadialAxisBelowTraces) layerData.push('radial-axis');
if(isAngularAxisBelowTraces) layerData.push('angular-line');
if(isRadialAxisBelowTraces) layerData.push('radial-line');
layerData.push('frontplot');
if(!isAngularAxisBelowTraces) layerData.push('angular-axis');
if(!isRadialAxisBelowTraces) layerData.push('radial-axis');
if(!isAngularAxisBelowTraces) layerData.push('angular-line');
if(!isRadialAxisBelowTraces) layerData.push('radial-line');
var join = _this.framework.selectAll('.polarsublayer')
.data(layerData, String);
join.enter().append('g')
.attr('class', function(d) { return 'polarsublayer ' + d;})
.each(function(d) {
var sel = layers[d] = d3.select(this);
switch(d) {
case 'frontplot':
sel.append('g').classed('scatterlayer', true);
break;
case 'backplot':
sel.append('g').classed('maplayer', true);
break;
case 'plotbg':
layers.bg = sel.append('path');
break;
case 'radial-grid':
sel.style('fill', 'none');
sel.append('g').classed('x', 1);
break;
case 'angular-grid':
sel.style('fill', 'none');
sel.append('g').classed('angularaxis', 1);
break;
case 'radial-line':
sel.append('line').style('fill', 'none');
break;
case 'angular-line':
sel.append('path').style('fill', 'none');
break;
}
});
join.order();
};
/* Polar subplots juggle with 6 'axis objects' (!), these are:
*
* - polarLayout.radialaxis (aka radialLayout in this file):
* - polarLayout.angularaxis (aka angularLayout in this file):
* used for data -> calcdata conversions (aka d2c) during the calc step
*
* - this.radialAxis
* extends polarLayout.radialaxis, adds mocked 'domain' and
* few other keys in order to reuse Cartesian doAutoRange and doTicksSingle,
* used for calcdata -> geometric conversions (aka c2g) during the plot step
* + setGeometry setups ax.c2g for given ax.range
* + setScale setups ax._m,ax._b for given ax.range
*
* - this.angularAxis
* extends polarLayout.angularaxis, adds mocked 'range' and 'domain' and
* a few other keys in order to reuse Cartesian doTicksSingle,
* used for calcdata -> geometric conversions (aka c2g) during the plot step
* + setGeometry setups ax.c2g given ax.rotation, ax.direction & ax._categories,
* and mocks ax.range
* + setScale setups ax._m,ax._b with that mocked ax.range
*
* - this.xaxis
* - this.yaxis
* setup so that polar traces can reuse plot methods of Cartesian traces
* which mostly rely on 2pixel methods (e.g ax.c2p)
*/
proto.updateLayout = function(fullLayout, polarLayout) {
var _this = this;
var layers = _this.layers;
var gs = fullLayout._size;
// axis attributes
var radialLayout = polarLayout.radialaxis;
var angularLayout = polarLayout.angularaxis;
// layout domains
var xDomain = polarLayout.domain.x;
var yDomain = polarLayout.domain.y;
// offsets from paper edge to layout domain box
_this.xOffset = gs.l + gs.w * xDomain[0];
_this.yOffset = gs.t + gs.h * (1 - yDomain[1]);
// lengths of the layout domain box
var xLength = _this.xLength = gs.w * (xDomain[1] - xDomain[0]);
var yLength = _this.yLength = gs.h * (yDomain[1] - yDomain[0]);
// sector to plot
var sector = _this.sector = polarLayout.sector;
var sectorBBox = _this.sectorBBox = computeSectorBBox(sector);
var dxSectorBBox = sectorBBox[2] - sectorBBox[0];
var dySectorBBox = sectorBBox[3] - sectorBBox[1];
// aspect ratios
var arDomain = yLength / xLength;
var arSector = Math.abs(dySectorBBox / dxSectorBBox);
// actual lengths and domains of subplot box
var xLength2, yLength2;
var xDomain2, yDomain2;
var gap;
if(arDomain > arSector) {
xLength2 = xLength;
yLength2 = xLength * arSector;
gap = (yLength - yLength2) / gs.h / 2;
xDomain2 = [xDomain[0], xDomain[1]];
yDomain2 = [yDomain[0] + gap, yDomain[1] - gap];
} else {
xLength2 = yLength / arSector;
yLength2 = yLength;
gap = (xLength - xLength2) / gs.w / 2;
xDomain2 = [xDomain[0] + gap, xDomain[1] - gap];
yDomain2 = [yDomain[0], yDomain[1]];
}
_this.xLength2 = xLength2;
_this.yLength2 = yLength2;
_this.xDomain2 = xDomain2;
_this.yDomain2 = yDomain2;
// actual offsets from paper edge to the subplot box top-left corner
var xOffset2 = _this.xOffset2 = gs.l + gs.w * xDomain2[0];
var yOffset2 = _this.yOffset2 = gs.t + gs.h * (1 - yDomain2[1]);
// circle radius in px
var radius = _this.radius = xLength2 / dxSectorBBox;
// circle center position in px
var cx = _this.cx = xOffset2 - radius * sectorBBox[0];
var cy = _this.cy = yOffset2 + radius * sectorBBox[3];
// circle center in the coordinate system of plot area
var cxx = _this.cxx = cx - xOffset2;
var cyy = _this.cyy = cy - yOffset2;
_this.radialAxis = _this.mockAxis(fullLayout, polarLayout, radialLayout, {
_axislayer: layers['radial-axis'],
_gridlayer: layers['radial-grid'],
// make this an 'x' axis to make positioning (especially rotation) easier
_id: 'x',
// convert to 'x' axis equivalent
side: {
counterclockwise: 'top',
clockwise: 'bottom'
}[radialLayout.side],
// spans length 1 radius
domain: [0, radius / gs.w]
});
_this.angularAxis = _this.mockAxis(fullLayout, polarLayout, angularLayout, {
_axislayer: layers['angular-axis'],
_gridlayer: layers['angular-grid'],
side: 'right',
// to get auto nticks right
domain: [0, Math.PI],
// don't pass through autorange logic
autorange: false
});
_this.doAutoRange(fullLayout, polarLayout);
// N.B. this sets _this.vangles
_this.updateAngularAxis(fullLayout, polarLayout);
// N.B. this sets _this.radialAxisAngle
_this.updateRadialAxis(fullLayout, polarLayout);
_this.updateRadialAxisTitle(fullLayout, polarLayout);
_this.xaxis = _this.mockCartesianAxis(fullLayout, polarLayout, {
_id: 'x',
domain: xDomain2
});
_this.yaxis = _this.mockCartesianAxis(fullLayout, polarLayout, {
_id: 'y',
domain: yDomain2
});
_this.clipPaths.forTraces.select('path')
.attr('d', pathSectorClosed(radius, sector, _this.vangles))
.attr('transform', strTranslate(cxx, cyy));
layers.frontplot
.attr('transform', strTranslate(xOffset2, yOffset2))
.call(Drawing.setClipUrl, _this._hasClipOnAxisFalse ? null : _this.clipIds.forTraces);
layers.bg
.attr('d', pathSectorClosed(radius, sector, _this.vangles))
.attr('transform', strTranslate(cx, cy))
.call(Color.fill, polarLayout.bgcolor);
// remove crispEdges - all the off-square angles in polar plots
// make these counterproductive.
_this.framework.selectAll('.crisp').classed('crisp', 0);
};
proto.mockAxis = function(fullLayout, polarLayout, axLayout, opts) {
var commonOpts = {
// to get _boundingBox computation right when showticklabels is false
anchor: 'free',
position: 0,
_pos: 0,
// dummy truthy value to make doTicksSingle draw the grid
_counteraxis: true,
// don't use automargins routine for labels
automargin: false
};
var ax = Lib.extendFlat(commonOpts, axLayout, opts);
setConvertPolar(ax, polarLayout, fullLayout);
return ax;
};
proto.mockCartesianAxis = function(fullLayout, polarLayout, opts) {
var _this = this;
var axId = opts._id;
var ax = Lib.extendFlat({type: 'linear'}, opts);
setConvertCartesian(ax, fullLayout);
var bboxIndices = {
x: [0, 2],
y: [1, 3]
};
ax.setRange = function() {
var sectorBBox = _this.sectorBBox;
var radialRange = _this.radialAxis.range;
var rSpan = radialRange[1] - radialRange[0];
var ind = bboxIndices[axId];
ax.range = [sectorBBox[ind[0]] * rSpan, sectorBBox[ind[1]] * rSpan];
};
ax.isPtWithinRange = axId === 'x' ?
function(d) { return _this.isPtInside(d); } :
function() { return true; };
ax.setRange();
ax.setScale();
return ax;
};
proto.doAutoRange = function(fullLayout, polarLayout) {
var gd = this.gd;
var radialAxis = this.radialAxis;
var radialLayout = polarLayout.radialaxis;
radialAxis.setScale();
doAutoRange(gd, radialAxis);
var rng = radialAxis.range;
radialLayout.range = rng.slice();
radialLayout._input.range = rng.slice();
};
proto.updateRadialAxis = function(fullLayout, polarLayout) {
var _this = this;
var gd = _this.gd;
var layers = _this.layers;
var radius = _this.radius;
var cx = _this.cx;
var cy = _this.cy;
var radialLayout = polarLayout.radialaxis;
var sector = polarLayout.sector;
var a0 = wrap360(sector[0]);
var ax = _this.radialAxis;
_this.fillViewInitialKey('radialaxis.angle', radialLayout.angle);
_this.fillViewInitialKey('radialaxis.range', ax.range.slice());
ax.setGeometry();
// rotate auto tick labels by 180 if in quadrant II and III to make them
// readable from left-to-right
//
// TODO try moving deeper in doTicksSingle for better results?
if(ax.tickangle === 'auto' && (a0 > 90 && a0 <= 270)) {
ax.tickangle = 180;
}
// easier to set rotate angle with custom translate function
ax._transfn = function(d) {
return 'translate(' + ax.l2p(d.x) + ',0)';
};
// set special grid path function
ax._gridpath = function(d) {
var r = ax.r2p(d.x);
return pathSector(r, sector, _this.vangles);
};
var newTickLayout = strTickLayout(radialLayout);
if(_this.radialTickLayout !== newTickLayout) {
layers['radial-axis'].selectAll('.xtick').remove();
_this.radialTickLayout = newTickLayout;
}
ax.setScale();
doTicksSingle(gd, ax, true);
// stash 'actual' radial axis angle for drag handlers (in degrees)
var angle = _this.radialAxisAngle = _this.vangles ?
rad2deg(snapToVertexAngle(deg2rad(radialLayout.angle), _this.vangles)) :
radialLayout.angle;
var trans = strTranslate(cx, cy) + strRotate(-angle);
updateElement(layers['radial-axis'], radialLayout.showticklabels || radialLayout.ticks, {
transform: trans
});
// move all grid paths to about circle center,
// undo individual grid lines translations
updateElement(layers['radial-grid'], radialLayout.showgrid, {
transform: strTranslate(cx, cy)
})
.selectAll('path').attr('transform', null);
updateElement(layers['radial-line'].select('line'), radialLayout.showline, {
x1: 0,
y1: 0,
x2: radius,
y2: 0,
transform: trans
})
.attr('stroke-width', radialLayout.linewidth)
.call(Color.stroke, radialLayout.linecolor);
};
proto.updateRadialAxisTitle = function(fullLayout, polarLayout, _angle) {
var _this = this;
var gd = _this.gd;
var radius = _this.radius;
var cx = _this.cx;
var cy = _this.cy;
var radialLayout = polarLayout.radialaxis;
var titleClass = _this.id + 'title';
var angle = _angle !== undefined ? _angle : _this.radialAxisAngle;
var angleRad = deg2rad(angle);
var cosa = Math.cos(angleRad);
var sina = Math.sin(angleRad);
var pad = 0;
if(radialLayout.title) {
var h = Drawing.bBox(_this.layers['radial-axis'].node()).height;
var ts = radialLayout.titlefont.size;
pad = radialLayout.side === 'counterclockwise' ?
-h - ts * 0.4 :
h + ts * 0.8;
}
_this.layers['radial-axis-title'] = Titles.draw(gd, titleClass, {
propContainer: radialLayout,
propName: _this.id + '.radialaxis.title',
placeholder: _(gd, 'Click to enter radial axis title'),
attributes: {
x: cx + (radius / 2) * cosa + pad * sina,
y: cy - (radius / 2) * sina + pad * cosa,
'text-anchor': 'middle'
},
transform: {rotate: -angle}
});
};
proto.updateAngularAxis = function(fullLayout, polarLayout) {
var _this = this;
var gd = _this.gd;
var layers = _this.layers;
var radius = _this.radius;
var cx = _this.cx;
var cy = _this.cy;
var angularLayout = polarLayout.angularaxis;
var sector = polarLayout.sector;
var ax = _this.angularAxis;
_this.fillViewInitialKey('angularaxis.rotation', angularLayout.rotation);
ax.setGeometry();
// 't'ick to 'g'eometric radians is used all over the place here
var t2g = function(d) { return ax.t2g(d.x); };
// (x,y) at max radius
function rad2xy(rad) {
return [radius * Math.cos(rad), radius * Math.sin(rad)];
}
// run rad2deg on tick0 and ditck for thetaunit: 'radians' axes
if(ax.type === 'linear' && ax.thetaunit === 'radians') {
ax.tick0 = rad2deg(ax.tick0);
ax.dtick = rad2deg(ax.dtick);
}
// Use tickval filter for category axes instead of tweaking
// the range w.r.t sector, so that sectors that cross 360 can
// show all their ticks.
if(ax.type === 'category') {
ax._tickFilter = function(d) {
return isAngleInsideSector(t2g(d), sector);
};
}
ax._transfn = function(d) {
var rad = t2g(d);
var xy = rad2xy(rad);
var out = strTranslate(cx + xy[0], cy - xy[1]);
// must also rotate ticks, but don't rotate labels and grid lines
var sel = d3.select(this);
if(sel && sel.node() && sel.classed('ticks')) {
out += strRotate(-rad2deg(rad));
}
return out;
};
ax._gridpath = function(d) {
var rad = t2g(d);
var xy = rad2xy(rad);
return 'M0,0L' + (-xy[0]) + ',' + xy[1];
};
var offset4fontsize = (angularLayout.ticks !== 'outside' ? 0.7 : 0.5);
ax._labelx = function(d) {
var rad = t2g(d);
var labelStandoff = ax._labelStandoff;
var pad = ax._pad;
var offset4tx = signSin(rad) === 0 ?
0 :
Math.cos(rad) * (labelStandoff + pad + offset4fontsize * d.fontSize);
var offset4tick = signCos(rad) * (d.dx + labelStandoff + pad);
return offset4tx + offset4tick;
};
ax._labely = function(d) {
var rad = t2g(d);
var labelStandoff = ax._labelStandoff;
var labelShift = ax._labelShift;
var pad = ax._pad;
var offset4tx = d.dy + d.fontSize * MID_SHIFT - labelShift;
var offset4tick = -Math.sin(rad) * (labelStandoff + pad + offset4fontsize * d.fontSize);
return offset4tx + offset4tick;
};
ax._labelanchor = function(angle, d) {
var rad = t2g(d);
return signSin(rad) === 0 ?
(signCos(rad) > 0 ? 'start' : 'end') :
'middle';
};
var newTickLayout = strTickLayout(angularLayout);
if(_this.angularTickLayout !== newTickLayout) {
layers['angular-axis'].selectAll('.' + ax._id + 'tick').remove();
_this.angularTickLayout = newTickLayout;
}
ax.setScale();
doTicksSingle(gd, ax, true);
// angle of polygon vertices in geometric radians (null means circles)
// TODO what to do when ax.period > ax._categories ??
var vangles;
if(polarLayout.gridshape === 'linear') {
vangles = ax._vals.map(t2g);
// ax._vals should be always ordered, make them
// always turn counterclockwise for convenience here
if(angleDelta(vangles[0], vangles[1]) < 0) {
vangles = vangles.slice().reverse();
}
} else {
vangles = null;
}
_this.vangles = vangles;
updateElement(layers['angular-line'].select('path'), angularLayout.showline, {
d: pathSectorClosed(radius, sector, vangles),
transform: strTranslate(cx, cy)
})
.attr('stroke-width', angularLayout.linewidth)
.call(Color.stroke, angularLayout.linecolor);
};
proto.updateFx = function(fullLayout, polarLayout) {
if(!this.gd._context.staticPlot) {
this.updateAngularDrag(fullLayout, polarLayout);
this.updateRadialDrag(fullLayout, polarLayout);
this.updateMainDrag(fullLayout, polarLayout);
}
};
proto.updateMainDrag = function(fullLayout, polarLayout) {
var _this = this;
var gd = _this.gd;
var layers = _this.layers;
var zoomlayer = fullLayout._zoomlayer;
var MINZOOM = constants.MINZOOM;
var OFFEDGE = constants.OFFEDGE;
var radius = _this.radius;
var cx = _this.cx;
var cy = _this.cy;
var cxx = _this.cxx;
var cyy = _this.cyy;
var sector = polarLayout.sector;
var vangles = _this.vangles;
var chw = constants.cornerHalfWidth;
var chl = constants.cornerLen / 2;
var mainDrag = dragBox.makeDragger(layers, 'path', 'maindrag', 'crosshair');
d3.select(mainDrag)
.attr('d', pathSectorClosed(radius, sector, vangles))
.attr('transform', strTranslate(cx, cy));
var dragOpts = {
element: mainDrag,
gd: gd,
subplot: _this.id,
plotinfo: {
xaxis: _this.xaxis,
yaxis: _this.yaxis
},
xaxes: [_this.xaxis],
yaxes: [_this.yaxis]
};
// mouse px position at drag start (0), move (1)
var x0, y0;
// radial distance from circle center at drag start (0), move (1)
var r0, r1;
// zoombox persistent quantities
var path0, dimmed, lum;
// zoombox, corners elements
var zb, corners;
function norm(x, y) {
return Math.sqrt(x * x + y * y);
}
function xy2r(x, y) {
return norm(x - cxx, y - cyy);
}
function xy2a(x, y) {
return Math.atan2(cyy - y, x - cxx);
}
function ra2xy(r, a) {
return [r * Math.cos(a), r * Math.sin(-a)];
}
function _pathSectorClosed(r) {
return pathSectorClosed(r, sector, vangles);
}
function pathCorner(r, a) {
if(r === 0) return _pathSectorClosed(2 * chw);
var da = chl / r;
var am = a - da;
var ap = a + da;
var rb = Math.max(0, Math.min(r, radius));
var rm = rb - chw;
var rp = rb + chw;
return 'M' + ra2xy(rm, am) +
'A' + [rm, rm] + ' 0,0,0 ' + ra2xy(rm, ap) +
'L' + ra2xy(rp, ap) +
'A' + [rp, rp] + ' 0,0,1 ' + ra2xy(rp, am) +
'Z';
}
// (x,y) is the pt at middle of the va0 <-> va1 edge
//
// ... we could eventually add another mode for cursor
// angles 'close to' enough to a particular vertex.
function pathCornerForPolygons(r, va0, va1) {
if(r === 0) return _pathSectorClosed(2 * chw);
var xy0 = ra2xy(r, va0);
var xy1 = ra2xy(r, va1);
var x = clampTiny((xy0[0] + xy1[0]) / 2);
var y = clampTiny((xy0[1] + xy1[1]) / 2);
var innerPts, outerPts;
if(x && y) {
var m = y / x;
var mperp = -1 / m;
var midPts = findXYatLength(chw, m, x, y);
innerPts = findXYatLength(chl, mperp, midPts[0][0], midPts[0][1]);
outerPts = findXYatLength(chl, mperp, midPts[1][0], midPts[1][1]);
} else {
var dx, dy;
if(y) {
// horizontal handles
dx = chl;
dy = chw;
} else {
// vertical handles
dx = chw;
dy = chl;
}
innerPts = [[x - dx, y - dy], [x + dx, y - dy]];
outerPts = [[x - dx, y + dy], [x + dx, y + dy]];
}
return 'M' + innerPts.join('L') +
'L' + outerPts.reverse().join('L') + 'Z';
}
function zoomPrep() {
r0 = null;
r1 = null;
path0 = _pathSectorClosed(radius);
dimmed = false;
var polarLayoutNow = gd._fullLayout[_this.id];
lum = tinycolor(polarLayoutNow.bgcolor).getLuminance();
zb = dragBox.makeZoombox(zoomlayer, lum, cx, cy, path0);
zb.attr('fill-rule', 'evenodd');
corners = dragBox.makeCorners(zoomlayer, cx, cy);
clearSelect(zoomlayer);
}
// N.B. this sets scoped 'r0' and 'r1'
// return true if 'valid' zoom distance, false otherwise
function clampAndSetR0R1(rr0, rr1) {
rr1 = Math.min(rr1, radius);
// starting or ending drag near center (outer edge),
// clamps radial distance at origin (at r=radius)
if(rr0 < OFFEDGE) rr0 = 0;
else if((radius - rr0) < OFFEDGE) rr0 = radius;
else if(rr1 < OFFEDGE) rr1 = 0;
else if((radius - rr1) < OFFEDGE) rr1 = radius;
// make sure r0 < r1,
// to get correct fill pattern in path1 below
if(Math.abs(rr1 - rr0) > MINZOOM) {
if(rr0 < rr1) {
r0 = rr0;
r1 = rr1;
} else {
r0 = rr1;
r1 = rr0;
}
return true;
} else {
r0 = null;
r1 = null;
return false;
}
}
function applyZoomMove(path1, cpath) {
path1 = path1 || path0;
cpath = cpath || 'M0,0Z';
zb.attr('d', path1);
corners.attr('d', cpath);
dragBox.transitionZoombox(zb, corners, dimmed, lum);
dimmed = true;
}
function zoomMove(dx, dy) {
var x1 = x0 + dx;
var y1 = y0 + dy;
var rr0 = xy2r(x0, y0);
var rr1 = Math.min(xy2r(x1, y1), radius);
var a0 = xy2a(x0, y0);
var path1;
var cpath;
if(clampAndSetR0R1(rr0, rr1)) {
path1 = path0 + _pathSectorClosed(r1) + _pathSectorClosed(r0);
// keep 'starting' angle
cpath = pathCorner(r0, a0) + pathCorner(r1, a0);
}
applyZoomMove(path1, cpath);
}
function findEnclosingVertexAngles(a) {
var i0 = findIndexOfMin(vangles, function(v) {
var adelta = angleDelta(v, a);
return adelta > 0 ? adelta : Infinity;
});
var i1 = Lib.mod(i0 + 1, vangles.length);
return [vangles[i0], vangles[i1]];
}
function findPolygonRadius(x, y, va0, va1) {
var xy = findIntersectionXY(va0, va1, va0, [x - cxx, cyy - y]);
return norm(xy[0], xy[1]);
}
function zoomMoveForPolygons(dx, dy) {
var x1 = x0 + dx;
var y1 = y0 + dy;
var a0 = xy2a(x0, y0);
var a1 = xy2a(x1, y1);
var vangles0 = findEnclosingVertexAngles(a0);
var vangles1 = findEnclosingVertexAngles(a1);
var rr0 = findPolygonRadius(x0, y0, vangles0[0], vangles0[1]);
var rr1 = Math.min(findPolygonRadius(x1, y1, vangles1[0], vangles1[1]), radius);
var path1;
var cpath;
if(clampAndSetR0R1(rr0, rr1)) {
path1 = path0 + _pathSectorClosed(r1) + _pathSectorClosed(r0);
// keep 'starting' angle here too
cpath = [
pathCornerForPolygons(r0, vangles0[0], vangles0[1]),
pathCornerForPolygons(r1, vangles0[0], vangles0[1])
].join(' ');
}
applyZoomMove(path1, cpath);
}
function zoomDone() {
dragBox.removeZoombox(gd);
if(r0 === null || r1 === null) return;
dragBox.showDoubleClickNotifier(gd);
var radialAxis = _this.radialAxis;
var radialRange = radialAxis.range;
var drange = radialRange[1] - radialRange[0];
var updateObj = {};
updateObj[_this.id + '.radialaxis.range'] = [
radialRange[0] + r0 * drange / radius,
radialRange[0] + r1 * drange / radius
];
Registry.call('relayout', gd, updateObj);
}
dragOpts.prepFn = function(evt, startX, startY) {
var dragModeNow = gd._fullLayout.dragmode;
var bbox = mainDrag.getBoundingClientRect();
x0 = startX - bbox.left;
y0 = startY - bbox.top;
// need to offset x/y as bbox center does not
// match origin for asymmetric polygons
if(vangles) {
var offset = findPolygonOffset(radius, sector, vangles);
x0 += cxx + offset[0];
y0 += cyy + offset[1];
}
switch(dragModeNow) {
case 'zoom':
if(vangles) {
dragOpts.moveFn = zoomMoveForPolygons;
} else {
dragOpts.moveFn = zoomMove;
}
dragOpts.doneFn = zoomDone;
zoomPrep(evt, startX, startY);
break;
case 'select':
case 'lasso':
prepSelect(evt, startX, startY, dragOpts, dragModeNow);
break;
}
};
dragOpts.clickFn = function(numClicks, evt) {
dragBox.removeZoombox(gd);
// TODO double once vs twice logic (autorange vs fixed range)
if(numClicks === 2) {
var updateObj = {};
for(var k in _this.viewInitial) {
updateObj[_this.id + '.' + k] = _this.viewInitial[k];
}
gd.emit('plotly_doubleclick', null);
Registry.call('relayout', gd, updateObj);
}
Fx.click(gd, evt, _this.id);
};
mainDrag.onmousemove = function(evt) {
Fx.hover(gd, evt, _this.id);
gd._fullLayout._lasthover = mainDrag;
gd._fullLayout._hoversubplot = _this.id;
};
mainDrag.onmouseout = function(evt) {
if(gd._dragging) return;
dragElement.unhover(gd, evt);
};
dragElement.init(dragOpts);
};
proto.updateRadialDrag = function(fullLayout, polarLayout) {
var _this = this;
var gd = _this.gd;
var layers = _this.layers;
var radius = _this.radius;
var cx = _this.cx;
var cy = _this.cy;
var radialAxis = _this.radialAxis;
var radialLayout = polarLayout.radialaxis;
var angle0 = deg2rad(_this.radialAxisAngle);
var range0 = radialAxis.range.slice();
var drange = range0[1] - range0[0];
var bl = constants.radialDragBoxSize;
var bl2 = bl / 2;
if(!radialLayout.visible) return;
var radialDrag = dragBox.makeRectDragger(layers, 'radialdrag', 'crosshair', -bl2, -bl2, bl, bl);
var dragOpts = {element: radialDrag, gd: gd};
var tx = cx + (radius + bl2) * Math.cos(angle0);
var ty = cy - (radius + bl2) * Math.sin(angle0);
d3.select(radialDrag)
.attr('transform', strTranslate(tx, ty));
// move function (either rotate or re-range flavor)
var moveFn2;
// rotate angle on done
var angle1;
// re-range range[1] on done
var rng1;
function moveFn(dx, dy) {
if(moveFn2) {
moveFn2(dx, dy);
} else {
var dvec = [dx, -dy];
var rvec = [Math.cos(angle0), Math.sin(angle0)];
var comp = Math.abs(Lib.dot(dvec, rvec) / Math.sqrt(Lib.dot(dvec, dvec)));
// mostly perpendicular motions rotate,
// mostly parallel motions re-range
if(!isNaN(comp)) {
moveFn2 = comp < 0.5 ? rotateMove : rerangeMove;
}
}
}
function doneFn() {
if(angle1 !== null) {
Registry.call('relayout', gd, _this.id + '.radialaxis.angle', angle1);
} else if(rng1 !== null) {
Registry.call('relayout', gd, _this.id + '.radialaxis.range[1]', rng1);
}
}
function rotateMove(dx, dy) {
var x1 = tx + dx;
var y1 = ty + dy;
angle1 = Math.atan2(cy - y1, x1 - cx);
if(_this.vangles) angle1 = snapToVertexAngle(angle1, _this.vangles);
angle1 = rad2deg(angle1);
var transform = strTranslate(cx, cy) + strRotate(-angle1);
layers['radial-axis'].attr('transform', transform);
layers['radial-line'].select('line').attr('transform', transform);
var fullLayoutNow = _this.gd._fullLayout;
var polarLayoutNow = fullLayoutNow[_this.id];
_this.updateRadialAxisTitle(fullLayoutNow, polarLayoutNow, angle1);
}
function rerangeMove(dx, dy) {
// project (dx, dy) unto unit radial axis vector
var dr = Lib.dot([dx, -dy], [Math.cos(angle0), Math.sin(angle0)]);
var rprime = range0[1] - drange * dr / radius * 0.75;
// make sure new range[1] does not change the range[0] -> range[1] sign
if((drange > 0) !== (rprime > range0[0])) return;
// update radial range -> update c2g -> update _m,_b
rng1 = radialAxis.range[1] = rprime;
radialAxis.setGeometry();
radialAxis.setScale();