@antv/g2/lib/util/scale.js

the Grammar of Graphics in Javascript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.getDefaultCategoryScaleRange = exports.getName = exports.syncScale = exports.createScaleByField = void 0;
var tslib_1 = require("tslib");
var util_1 = require("@antv/util");
var dependents_1 = require("../dependents");
var coordinate_1 = require("./coordinate");
var dateRegex = /^(?:(?!0000)[0-9]{4}([-/.]+)(?:(?:0?[1-9]|1[0-2])\1(?:0?[1-9]|1[0-9]|2[0-8])|(?:0?[13-9]|1[0-2])\1(?:29|30)|(?:0?[13578]|1[02])\1(?:31))|(?:[0-9]{2}(?:0[48]|[2468][048]|[13579][26])|(?:0[48]|[2468][048]|[13579][26])00)([-/.]+)0?2\2(?:29))(\s+([01]|([01][0-9]|2[0-3])):([0-9]|[0-5][0-9]):([0-9]|[0-5][0-9]))?$/;
/**
 * 获取字段对应数据的类型
 * @param field 数据字段名
 * @param data 数据源
 * @returns default type 返回对应的数据类型
 */
function getDefaultType(value) {
    var type = 'linear';
    if (dateRegex.test(value)) {
        type = 'timeCat';
    }
    else if (util_1.isString(value)) {
        type = 'cat';
    }
    return type;
}
/**
 * @ignore
 * 为指定的 `field` 字段数据创建 scale
 * @param field 字段名
 * @param [data] 数据集，可为空
 * @param [scaleDef] 列定义，可为空
 * @returns scale 返回创建的 Scale 实例
 */
function createScaleByField(field, data, scaleDef) {
    var validData = data || [];
    if (util_1.isNumber(field) || (util_1.isNil(util_1.firstValue(validData, field)) && util_1.isEmpty(scaleDef))) {
        var Identity = dependents_1.getScale('identity');
        return new Identity({
            field: field.toString(),
            values: [field],
        });
    }
    var values = util_1.valuesOfKey(validData, field);
    // 如果已经定义过这个度量
    var type = util_1.get(scaleDef, 'type', getDefaultType(values[0]));
    var ScaleCtor = dependents_1.getScale(type);
    return new ScaleCtor(tslib_1.__assign({ field: field,
        values: values }, scaleDef));
}
exports.createScaleByField = createScaleByField;
/**
 * @ignore
 * 同步 scale
 * @todo 是否可以通过 scale.update() 方法进行更新
 * @param scale 需要同步的 scale 实例
 * @param newScale 同步源 Scale
 */
function syncScale(scale, newScale) {
    if (scale.type !== 'identity' && newScale.type !== 'identity') {
        var obj = {};
        for (var k in newScale) {
            if (Object.prototype.hasOwnProperty.call(newScale, k)) {
                obj[k] = newScale[k];
            }
        }
        scale.change(obj);
    }
}
exports.syncScale = syncScale;
/**
 * @ignore
 * get the scale name, if alias exist, return alias, or else field
 * @param scale
 * @returns the name of field
 */
function getName(scale) {
    return scale.alias || scale.field;
}
exports.getName = getName;
/**
 * 根据 scale values 和 coordinate 获取分类默认 range
 * @param scale 需要获取的 scale 实例
 * @param coordinate coordinate 实例
 * @param theme theme
 */
function getDefaultCategoryScaleRange(scale, coordinate, theme) {
    var values = scale.values;
    var count = values.length;
    var range;
    if (count === 1) {
        range = [0.5, 1]; // 只有一个分类时,防止计算出现 [0.5,0.5] 的状态
    }
    else {
        var widthRatio = 1;
        var offset = 0;
        if (coordinate_1.isFullCircle(coordinate)) {
            if (!coordinate.isTransposed) {
                range = [0, 1 - 1 / count];
            }
            else {
                widthRatio = util_1.get(theme, 'widthRatio.multiplePie', 1 / 1.3);
                offset = (1 / count) * widthRatio;
                range = [offset / 2, 1 - offset / 2];
            }
        }
        else {
            offset = 1 / count / 2; // 两边留下分类空间的一半
            range = [offset, 1 - offset]; // 坐标轴最前面和最后面留下空白防止绘制柱状图时
        }
    }
    return range;
}
exports.getDefaultCategoryScaleRange = getDefaultCategoryScaleRange;
//# sourceMappingURL=scale.js.map