Function prepareTruncateOptions

libs/echarts/echarts.simple.js:7863–7899

(containerWidth, font, ellipsis, options)

}

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

    options.font = font;
    var ellipsis = retrieve2(ellipsis, '...');
    options.maxIterations = retrieve2(options.maxIterations, 2);
    var minChar = options.minChar = retrieve2(options.minChar, 0);
    // FIXME
    // Other languages?
    options.cnCharWidth = getWidth('国', font);
    // FIXME
    // Consider proportional font?
    var ascCharWidth = options.ascCharWidth = getWidth('a', font);
    options.placeholder = retrieve2(options.placeholder, '');

    // Example 1: minChar: 3, text: 'asdfzxcv', truncate result: 'asdf', but not: 'a...'.
    // Example 2: minChar: 3, text: '维度', truncate result: '维', but not: '...'.
    var contentWidth = containerWidth = Math.max(0, containerWidth - 1); // Reserve some gap.
    for (var i = 0; i < minChar && contentWidth >= ascCharWidth; i++) {
        contentWidth -= ascCharWidth;
    }

    var ellipsisWidth = getWidth(ellipsis, font);
    if (ellipsisWidth > contentWidth) {
        ellipsis = '';
        ellipsisWidth = 0;
    }

    contentWidth = containerWidth - ellipsisWidth;

    options.ellipsis = ellipsis;
    options.ellipsisWidth = ellipsisWidth;
    options.contentWidth = contentWidth;
    options.containerWidth = containerWidth;

    return options;
}

function truncateSingleLine(textLine, options) {
    var containerWidth = options.containerWidth;