echarts/src/component/axis/singleAxisHelper.js

A powerful charting and visualization library for browser

define(function (require) {

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

    var helper = {};

    /**
     * @param {Object} opt {labelInside}
     * @return {Object} {
     *  position, rotation, labelDirection, labelOffset,
     *  tickDirection, labelRotate, labelInterval, z2
     * }
     */
    helper.layout = function (axisModel, opt) {
        opt = opt || {};
        var single = axisModel.coordinateSystem;
        var axis = axisModel.axis;
        var layout = {};

        var axisPosition = axis.position;
        var orient = axis.orient;

        var rect = single.getRect();
        var rectBound = [rect.x, rect.x + rect.width, rect.y, rect.y + rect.height];

        var positionMap = {
            horizontal: {top: rectBound[2], bottom: rectBound[3]},
            vertical: {left: rectBound[0], right: rectBound[1]}
        };

        layout.position = [
            orient === 'vertical'
                ? positionMap.vertical[axisPosition]
                : rectBound[0],
            orient === 'horizontal'
                ? positionMap.horizontal[axisPosition]
                : rectBound[3]
        ];

        var r = {horizontal: 0, vertical: 1};
        layout.rotation = Math.PI / 2 * r[orient];

        var directionMap = {top: -1, bottom: 1, right: 1, left: -1};

        layout.labelDirection = layout.tickDirection
            = layout.nameDirection
            = directionMap[axisPosition];

        if (axisModel.get('axisTick.inside')) {
            layout.tickDirection = -layout.tickDirection;
        }

        if (zrUtil.retrieve(opt.labelInside, axisModel.get('axisLabel.inside'))) {
            layout.labelDirection = -layout.labelDirection;
        }

        var labelRotation = opt.rotate;
        labelRotation == null && (labelRotation = axisModel.get('axisLabel.rotate'));
        layout.labelRotation = axisPosition === 'top' ? -labelRotation : labelRotation;

        layout.labelInterval = axis.getLabelInterval();

        layout.z2 = 1;

        return layout;
    };

    return helper;

});