echarts/lib/coord/single/prepareCustom.js

A powerful charting and visualization library for browser

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

    function dataToCoordSize(dataSize, dataItem) {
        // dataItem is necessary in log axis.
        var axis = this.getAxis();
        var val = dataItem instanceof Array ? dataItem[0] : dataItem;
        var halfSize = (dataSize instanceof Array ? dataSize[0] : dataSize) / 2;
        return axis.type === 'category'
            ? axis.getBandWidth()
            : Math.abs(axis.dataToCoord(val - halfSize) - axis.dataToCoord(val + halfSize));
    }

    function prepareCustom(coordSys) {
        var rect = coordSys.getRect();

        return {
            coordSys: {
                type: 'singleAxis',
                x: rect.x,
                y: rect.y,
                width: rect.width,
                height: rect.height
            },
            api: {
                coord: zrUtil.bind(coordSys.dataToPoint, coordSys),
                size: zrUtil.bind(dataToCoordSize, coordSys)
            }
        };
    }

    module.exports = prepareCustom;