Function truncateText

libs/echarts/echarts-en.simple.js:7846–7861

* Show ellipsis if overflow. * * @public * @param {string} text * @param {string} containerWidth * @param {string} font * @param {number} [ellipsis='...'] * @param {Object} [options] * @param {number} [options.maxIterations=3] * @param {number} [options.minChar=0] If truncate result

(text, containerWidth, font, ellipsis, options)

 * @return {string}
 */
function truncateText(text, containerWidth, font, ellipsis, options) {
    if (!containerWidth) {
        return '';
    }

    var textLines = (text + '').split('\n');
    options = prepareTruncateOptions(containerWidth, font, ellipsis, options);

    // FIXME
    // It is not appropriate that every line has '...' when truncate multiple lines.
    for (var i = 0, len = textLines.length; i < len; i++) {
        textLines[i] = truncateSingleLine(textLines[i], options);
    }

    return textLines.join('\n');
}

function prepareTruncateOptions(containerWidth, font, ellipsis, options) {
    options = extend({}, options);