class GroundData {
    /**
     *
     * @param {object} options 生成地形的配置参数
     * @param {number} options.groundNum 数量
     * @param {array} options.gaps 间距范围
     * @param {array} options.widths 宽度范围
     * @param {array} options.heights 高度范围
     */
    constructor(options) {
        this.options = options;

        return this.initData();
    }

    initData() {
        let totalWidth = 0;
        let { groundNum, gaps, widths, heights, stageHeight } = this.options;
        let groundData = [];
        while (groundNum > 0) {
            let gap = this.getRandomBetweenTwoNumbers(gaps[0], gaps[1]);
            let width = totalWidth === 0 ? 750 : this.getRandomBetweenTwoNumbers(widths[0], widths[1]);
            let height = this.getRandomBetweenTwoNumbers(
                heights[0],
                heights[1]
            );
            groundData.push({
                x: totalWidth,
                y: stageHeight - height,
                width,
                height
            });
            totalWidth += gap + width;
            groundNum--;
        }

        return groundData
    }

    getRandomBetweenTwoNumbers(start, end) {
        return Math.random() * (end - start) + start;
    }
}

export default GroundData;