calc.js

/**
* 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 colorscaleCalc = require('../../components/colorscale/calc');
var hasColumns = require('../heatmap/has_columns');
var convertColumnData = require('../heatmap/convert_column_xyz');
var clean2dArray = require('../heatmap/clean_2d_array');
var maxRowLength = require('../heatmap/max_row_length');
var interp2d = require('../heatmap/interp2d');
var findEmpties = require('../heatmap/find_empties');
var makeBoundArray = require('../heatmap/make_bound_array');
var supplyDefaults = require('./defaults');
var lookupCarpet = require('../carpet/lookup_carpetid');
var setContours = require('../contour/set_contours');

// most is the same as heatmap calc, then adjust it
// though a few things inside heatmap calc still look for
// contour maps, because the makeBoundArray calls are too entangled
module.exports = function calc(gd, trace) {
    var carpet = trace._carpetTrace = lookupCarpet(gd, trace);
    if(!carpet || !carpet.visible || carpet.visible === 'legendonly') return;

    if(!trace.a || !trace.b) {
        // Look up the original incoming carpet data:
        var carpetdata = gd.data[carpet.index];

        // Look up the incoming trace data, *except* perform a shallow
        // copy so that we're not actually modifying it when we use it
        // to supply defaults:
        var tracedata = gd.data[trace.index];
        // var tracedata = extendFlat({}, gd.data[trace.index]);

        // If the data is not specified
        if(!tracedata.a) tracedata.a = carpetdata.a;
        if(!tracedata.b) tracedata.b = carpetdata.b;

        supplyDefaults(tracedata, trace, trace._defaultColor, gd._fullLayout);
    }

    var cd = heatmappishCalc(gd, trace);

    setContours(trace);

    return cd;
};

function heatmappishCalc(gd, trace) {
    // prepare the raw data
    // run makeCalcdata on x and y even for heatmaps, in case of category mappings
    var carpet = trace._carpetTrace;
    var aax = carpet.aaxis;
    var bax = carpet.baxis;
    var a,
        a0,
        da,
        b,
        b0,
        db,
        z;

    // cancel minimum tick spacings (only applies to bars and boxes)
    aax._minDtick = 0;
    bax._minDtick = 0;

    if(hasColumns(trace)) convertColumnData(trace, aax, bax, 'a', 'b', ['z']);

    a = trace.a ? aax.makeCalcdata(trace, 'a') : [];
    b = trace.b ? bax.makeCalcdata(trace, 'b') : [];
    a0 = trace.a0 || 0;
    da = trace.da || 1;
    b0 = trace.b0 || 0;
    db = trace.db || 1;

    z = clean2dArray(trace.z, trace.transpose);

    trace._emptypoints = findEmpties(z);
    trace._interpz = interp2d(z, trace._emptypoints, trace._interpz);

    // create arrays of brick boundaries, to be used by autorange and heatmap.plot
    var xlen = maxRowLength(z),
        xIn = trace.xtype === 'scaled' ? '' : a,
        xArray = makeBoundArray(trace, xIn, a0, da, xlen, aax),
        yIn = trace.ytype === 'scaled' ? '' : b,
        yArray = makeBoundArray(trace, yIn, b0, db, z.length, bax);

    var cd0 = {
        a: xArray,
        b: yArray,
        z: z,
    };

    if(trace.contours.type === 'levels') {
        // auto-z and autocolorscale if applicable
        colorscaleCalc(trace, z, '', 'z');
    }

    return [cd0];
}