Function distance

libs/echarts/echarts.simple.js:1076–1081

* 计算向量间距离 * @param {Vector2} v1 * @param {Vector2} v2 * @return {number}

(v1, v2)

 * @return {number}
 */
function distance(v1, v2) {
    return Math.sqrt(
        (v1[0] - v2[0]) * (v1[0] - v2[0])
        + (v1[1] - v2[1]) * (v1[1] - v2[1])
    );
}
var dist = distance;

/**