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polar.js
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/**
* Copyright 2012-2020, 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 strRotate = Lib.strRotate;
var strTranslate = Lib.strTranslate;
var Color = require('../../components/color');
var Drawing = require('../../components/drawing');
var Plots = require('../plots');
var Axes = require('../../plots/cartesian/axes');
var setConvertCartesian = require('../cartesian/set_convert');
var setConvertPolar = require('./set_convert');
var doAutoRange = require('../cartesian/autorange').doAutoRange;
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 selectOnClick = require('../cartesian/select').selectOnClick;
var clearSelect = require('../cartesian/select').clearSelect;
var setCursor = require('../../lib/setcursor');
var clearGlCanvases = require('../../lib/clear_gl_canvases');
var redrawReglTraces = require('../../plot_api/subroutines').redrawReglTraces;
var MID_SHIFT = require('../../constants/alignment').MID_SHIFT;
var constants = require('./constants');
var helpers = require('./helpers');
var _ = Lib._;
var mod = Lib.mod;
var deg2rad = Lib.deg2rad;
var rad2deg = Lib.rad2deg;
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
// as polar subplots do not implement the 'ticks' editType
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-line');
if(isRadialAxisBelowTraces) layerData.push('radial-line');
if(isAngularAxisBelowTraces) layerData.push('angular-axis');
if(isRadialAxisBelowTraces) layerData.push('radial-axis');
layerData.push('frontplot');
if(!isAngularAxisBelowTraces) layerData.push('angular-line');
if(!isRadialAxisBelowTraces) layerData.push('radial-line');
if(!isAngularAxisBelowTraces) layerData.push('angular-axis');
if(!isRadialAxisBelowTraces) layerData.push('radial-axis');
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':
// TODO add option to place in 'backplot' layer??
sel.append('g').classed('barlayer', true);
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');
break;
case 'angular-grid':
sel.style('fill', 'none');
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 the Axes
* drawing routines.
* 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 the Axes drawing routines.
* 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 = polarLayout.sector;
_this.sectorInRad = sector.map(deg2rad);
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;
// 'inner' radius in px (when polar.hole is set)
var innerRadius = _this.innerRadius = polarLayout.hole * radius;
// 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, {
// 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],
// keep track of real side
_realSide: radialLayout.side,
// spans length 1 radius
domain: [innerRadius / gs.w, radius / gs.w]
});
_this.angularAxis = _this.mockAxis(fullLayout, polarLayout, angularLayout, {
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
});
var dPath = _this.pathSubplot();
_this.clipPaths.forTraces.select('path')
.attr('d', dPath)
.attr('transform', strTranslate(cxx, cyy));
layers.frontplot
.attr('transform', strTranslate(xOffset2, yOffset2))
.call(Drawing.setClipUrl, _this._hasClipOnAxisFalse ? null : _this.clipIds.forTraces, _this.gd);
layers.bg
.attr('d', dPath)
.attr('transform', strTranslate(cx, cy))
.call(Color.fill, polarLayout.bgcolor);
};
proto.mockAxis = function(fullLayout, polarLayout, axLayout, opts) {
var ax = Lib.extendFlat({}, 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 ind = bboxIndices[axId];
var rl = _this.radialAxis._rl;
var drl = (rl[1] - rl[0]) / (1 - polarLayout.hole);
ax.range = [sectorBBox[ind[0]] * drl, sectorBBox[ind[1]] * drl];
};
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();
radialAxis._rl = [
radialAxis.r2l(rng[0], null, 'gregorian'),
radialAxis.r2l(rng[1], null, 'gregorian')
];
};
proto.updateRadialAxis = function(fullLayout, polarLayout) {
var _this = this;
var gd = _this.gd;
var layers = _this.layers;
var radius = _this.radius;
var innerRadius = _this.innerRadius;
var cx = _this.cx;
var cy = _this.cy;
var radialLayout = polarLayout.radialaxis;
var a0 = mod(polarLayout.sector[0], 360);
var ax = _this.radialAxis;
var hasRoomForIt = innerRadius < radius;
_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 Axes.drawLabels for better results?
if(ax.tickangle === 'auto' && (a0 > 90 && a0 <= 270)) {
ax.tickangle = 180;
}
// easier to set rotate angle with custom translate function
var transFn = function(d) {
return strTranslate(ax.l2p(d.x) + innerRadius, 0);
};
// set special grid path function
var gridPathFn = function(d) {
return _this.pathArc(ax.r2p(d.x) + innerRadius);
};
var newTickLayout = strTickLayout(radialLayout);
if(_this.radialTickLayout !== newTickLayout) {
layers['radial-axis'].selectAll('.xtick').remove();
_this.radialTickLayout = newTickLayout;
}
if(hasRoomForIt) {
ax.setScale();
var vals = Axes.calcTicks(ax);
var valsClipped = Axes.clipEnds(ax, vals);
var tickSign = Axes.getTickSigns(ax)[2];
Axes.drawTicks(gd, ax, {
vals: vals,
layer: layers['radial-axis'],
path: Axes.makeTickPath(ax, 0, tickSign),
transFn: transFn,
crisp: false
});
Axes.drawGrid(gd, ax, {
vals: valsClipped,
layer: layers['radial-grid'],
path: gridPathFn,
transFn: Lib.noop,
crisp: false
});
Axes.drawLabels(gd, ax, {
vals: vals,
layer: layers['radial-axis'],
transFn: transFn,
labelFns: Axes.makeLabelFns(ax, 0)
});
}
// 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 tLayer = strTranslate(cx, cy);
var tLayer2 = tLayer + strRotate(-angle);
updateElement(
layers['radial-axis'],
hasRoomForIt && (radialLayout.showticklabels || radialLayout.ticks),
{transform: tLayer2}
);
updateElement(
layers['radial-grid'],
hasRoomForIt && radialLayout.showgrid,
{transform: tLayer}
);
updateElement(
layers['radial-line'].select('line'),
hasRoomForIt && radialLayout.showline,
{
x1: innerRadius,
y1: 0,
x2: radius,
y2: 0,
transform: tLayer2
}
)
.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;
// Hint: no need to check if there is in fact a title.text set
// because if plot is editable, pad needs to be calculated anyways
// to properly show placeholder text when title is empty.
if(radialLayout.title) {
var h = Drawing.bBox(_this.layers['radial-axis'].node()).height;
var ts = radialLayout.title.font.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 innerRadius = _this.innerRadius;
var cx = _this.cx;
var cy = _this.cy;
var angularLayout = polarLayout.angularaxis;
var ax = _this.angularAxis;
_this.fillViewInitialKey('angularaxis.rotation', angularLayout.rotation);
ax.setGeometry();
ax.setScale();
// 't'ick to 'g'eometric radians is used all over the place here
var t2g = function(d) { return ax.t2g(d.x); };
// 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);
}
var _transFn = function(rad) {
return strTranslate(cx + radius * Math.cos(rad), cy - radius * Math.sin(rad));
};
var transFn = function(d) {
return _transFn(t2g(d));
};
var transFn2 = function(d) {
var rad = t2g(d);
return _transFn(rad) + strRotate(-rad2deg(rad));
};
var gridPathFn = function(d) {
var rad = t2g(d);
var cosRad = Math.cos(rad);
var sinRad = Math.sin(rad);
return 'M' + [cx + innerRadius * cosRad, cy - innerRadius * sinRad] +
'L' + [cx + radius * cosRad, cy - radius * sinRad];
};
var out = Axes.makeLabelFns(ax, 0);
var labelStandoff = out.labelStandoff;
var labelFns = {};
labelFns.xFn = function(d) {
var rad = t2g(d);
return Math.cos(rad) * labelStandoff;
};
labelFns.yFn = function(d) {
var rad = t2g(d);
var ff = Math.sin(rad) > 0 ? 0.2 : 1;
return -Math.sin(rad) * (labelStandoff + d.fontSize * ff) +
Math.abs(Math.cos(rad)) * (d.fontSize * MID_SHIFT);
};
labelFns.anchorFn = function(d) {
var rad = t2g(d);
var cos = Math.cos(rad);
return Math.abs(cos) < 0.1 ?
'middle' :
(cos > 0 ? 'start' : 'end');
};
labelFns.heightFn = function(d, a, h) {
var rad = t2g(d);
return -0.5 * (1 + Math.sin(rad)) * h;
};
var newTickLayout = strTickLayout(angularLayout);
if(_this.angularTickLayout !== newTickLayout) {
layers['angular-axis'].selectAll('.' + ax._id + 'tick').remove();
_this.angularTickLayout = newTickLayout;
}
var vals = Axes.calcTicks(ax);
// 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 = vals.map(t2g);
// ax._vals should be always ordered, make them
// always turn counterclockwise for convenience here
if(Lib.angleDelta(vangles[0], vangles[1]) < 0) {
vangles = vangles.slice().reverse();
}
} else {
vangles = null;
}
_this.vangles = vangles;
// 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') {
vals = vals.filter(function(d) {
return Lib.isAngleInsideSector(t2g(d), _this.sectorInRad);
});
}
if(ax.visible) {
var tickSign = ax.ticks === 'inside' ? -1 : 1;
var pad = (ax.linewidth || 1) / 2;
Axes.drawTicks(gd, ax, {
vals: vals,
layer: layers['angular-axis'],
path: 'M' + (tickSign * pad) + ',0h' + (tickSign * ax.ticklen),
transFn: transFn2,
crisp: false
});
Axes.drawGrid(gd, ax, {
vals: vals,
layer: layers['angular-grid'],
path: gridPathFn,
transFn: Lib.noop,
crisp: false
});
Axes.drawLabels(gd, ax, {
vals: vals,
layer: layers['angular-axis'],
repositionOnUpdate: true,
transFn: transFn,
labelFns: labelFns
});
}
// TODO maybe two arcs is better here?
// maybe split style attributes between inner and outer angular axes?
updateElement(layers['angular-line'].select('path'), angularLayout.showline, {
d: _this.pathSubplot(),
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);
this.updateRadialDrag(fullLayout, polarLayout, 0);
this.updateRadialDrag(fullLayout, polarLayout, 1);
this.updateMainDrag(fullLayout);
}
};
proto.updateMainDrag = function(fullLayout) {
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 innerRadius = _this.innerRadius;
var cx = _this.cx;
var cy = _this.cy;
var cxx = _this.cxx;
var cyy = _this.cyy;
var sectorInRad = _this.sectorInRad;
var vangles = _this.vangles;
var radialAxis = _this.radialAxis;
var clampTiny = helpers.clampTiny;
var findXYatLength = helpers.findXYatLength;
var findEnclosingVertexAngles = helpers.findEnclosingVertexAngles;
var chw = constants.cornerHalfWidth;
var chl = constants.cornerLen / 2;
var scaleX;
var scaleY;
var mainDrag = dragBox.makeDragger(layers, 'path', 'maindrag', 'crosshair');
d3.select(mainDrag)
.attr('d', _this.pathSubplot())
.attr('transform', strTranslate(cx, cy));
var dragOpts = {
element: mainDrag,
gd: gd,
subplot: _this.id,
plotinfo: {
id: _this.id,
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 pathCorner(r, a) {
if(r === 0) return _this.pathSector(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 _this.pathSector(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 = _this.pathSubplot();
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(gd);
}
// N.B. this sets scoped 'r0' and 'r1'
// return true if 'valid' zoom distance, false otherwise
function clampAndSetR0R1(rr0, rr1) {
rr1 = Math.max(Math.min(rr1, radius), innerRadius);
// 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;
var updateObj = {};
computeZoomUpdates(updateObj);
gd.emit('plotly_relayouting', updateObj);
}
function zoomMove(dx, dy) {
dx = dx * scaleX;
dy = dy * scaleY;
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 + _this.pathSector(r1);
if(r0) path1 += _this.pathSector(r0);
// keep 'starting' angle
cpath = pathCorner(r0, a0) + pathCorner(r1, a0);
}
applyZoomMove(path1, cpath);
}
function findPolygonRadius(x, y, va0, va1) {
var xy = helpers.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, vangles);
var vangles1 = findEnclosingVertexAngles(a1, vangles);
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 + _this.pathSector(r1);
if(r0) path1 += _this.pathSector(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;
var updateObj = {};
computeZoomUpdates(updateObj);
dragBox.showDoubleClickNotifier(gd);
Registry.call('_guiRelayout', gd, updateObj);
}
function computeZoomUpdates(update) {
var rl = radialAxis._rl;
var m = (rl[1] - rl[0]) / (1 - innerRadius / radius) / radius;
var newRng = [
rl[0] + (r0 - innerRadius) * m,
rl[0] + (r1 - innerRadius) * m
];
update[_this.id + '.radialaxis.range'] = newRng;
}
function zoomClick(numClicks, evt) {
var clickMode = gd._fullLayout.clickmode;
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('_guiRelayout', gd, updateObj);
}
if(clickMode.indexOf('select') > -1 && numClicks === 1) {
selectOnClick(evt, gd, [_this.xaxis], [_this.yaxis], _this.id, dragOpts);
}
if(clickMode.indexOf('event') > -1) {
Fx.click(gd, evt, _this.id);
}
}
dragOpts.prepFn = function(evt, startX, startY) {
var dragModeNow = gd._fullLayout.dragmode;
var bbox = mainDrag.getBoundingClientRect();
gd._fullLayout._calcInverseTransform(gd);
var inverse = gd._fullLayout._invTransform;
scaleX = gd._fullLayout._invScaleX;
scaleY = gd._fullLayout._invScaleY;
var transformedCoords = Lib.apply3DTransform(inverse)(startX - bbox.left, startY - bbox.top);
x0 = transformedCoords[0];
y0 = transformedCoords[1];
// need to offset x/y as bbox center does not
// match origin for asymmetric polygons
if(vangles) {
var offset = helpers.findPolygonOffset(radius, sectorInRad[0], sectorInRad[1], vangles);
x0 += cxx + offset[0];
y0 += cyy + offset[1];
}
switch(dragModeNow) {
case 'zoom':
if(vangles) {
dragOpts.moveFn = zoomMoveForPolygons;
} else {
dragOpts.moveFn = zoomMove;
}
dragOpts.clickFn = zoomClick;
dragOpts.doneFn = zoomDone;
zoomPrep(evt, startX, startY);
break;
case 'select':
case 'lasso':
prepSelect(evt, startX, startY, dragOpts, dragModeNow);
break;
}
};
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, rngIndex) {
var _this = this;
var gd = _this.gd;
var layers = _this.layers;
var radius = _this.radius;