src/coord/cartesian/Grid.js

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/**
 * Grid is a region which contains at most 4 cartesian systems
 *
 * TODO Default cartesian
 */
define(function(require, factory) {

    var layout = require('../../util/layout');
    var axisHelper = require('../../coord/axisHelper');

    var zrUtil = require('zrender/core/util');
    var Cartesian2D = require('./Cartesian2D');
    var Axis2D = require('./Axis2D');

    var each = zrUtil.each;

    var ifAxisCrossZero = axisHelper.ifAxisCrossZero;
    var niceScaleExtent = axisHelper.niceScaleExtent;

    // 依赖 GridModel, AxisModel 做预处理
    require('./GridModel');

    /**
     * Check if the axis is used in the specified grid
     * @inner
     */
    function isAxisUsedInTheGrid(axisModel, gridModel, ecModel) {
        return axisModel.findGridModel() === gridModel;
    }

    function getLabelUnionRect(axis) {
        var axisModel = axis.model;
        var labels = axisModel.getFormattedLabels();
        var rect;
        var step = 1;
        var labelCount = labels.length;
        if (labelCount > 40) {
            // Simple optimization for large amount of labels
            step = Math.ceil(labelCount / 40);
        }
        for (var i = 0; i < labelCount; i += step) {
            if (!axis.isLabelIgnored(i)) {
                var singleRect = axisModel.getTextRect(labels[i]);
                // FIXME consider label rotate
                rect ? rect.union(singleRect) : (rect = singleRect);
            }
        }
        return rect;
    }

    function Grid(gridModel, ecModel, api) {
        /**
         * @type {Object.<string, module:echarts/coord/cartesian/Cartesian2D>}
         * @private
         */
        this._coordsMap = {};

        /**
         * @type {Array.<module:echarts/coord/cartesian/Cartesian>}
         * @private