import { SGradient, SPoint } from "./";

/**
 * 线性渐变
 *
 * @author  庞利祥(sybotan@126.com)
 */
export class SLinearGradient extends SGradient {
    /**
     * 构造函数
     *
     * @param   start   起点坐标
     * @param   end     终点坐标
     */
    constructor(start: SPoint, end: SPoint);

    /**
     * 构造函数
     *
     * @param   x1      起点X坐标
     * @param   y1      起点Y坐标
     * @param   x2      终点X坐标
     * @param   y2      终点Y坐标
     */
    constructor(x1: number, y1: number, x2: number, y2: number);

    /**
     * 构造函数（重载实现）
     *
     * @param   x1      起点X坐标
     * @param   y1      起点Y坐标
     * @param   x2      终点X坐标
     * @param   y2      终点Y坐标
     */
    constructor(
        x1: number | SPoint,
        y1: number | SPoint,
        x2?: number,
        y2?: number
    ) {
        super();
        if (x1 instanceof SPoint && y1 instanceof SPoint) {
            this.start = new SPoint(x1);
            this.end = new SPoint(y1);
        } else {
            this.start = new SPoint(x1 as number, y1 as number);
            this.end = new SPoint(x2 as number, y2 as number);
        }
    } // Constructor()
} // Class SGradientBrush