import { Vec2, Vec3 } from "cc";
/**
 * 几何工具类
 * @author 袁浩、王锡铜
 */
export class GeometryUtils {
    /**
     * Vec2转Vec3
     * @param v2 2D坐标
     * @returns 
     */
    public static V2ToV3(v2: Vec2): Vec3 {
        return new Vec3(v2.x, v2.y, 0);
    }
    /**
     * Vec3转Vec2
     * @param v2 2D坐标
     * @returns 
     */
    public static V3ToV2(v3: Vec3): Vec2 {
        return new Vec2(v3.x, v3.y);
    }
    /**
     * 对值进行约束
     * @returns 
     */
    public static clamp(value: number, min: number, max: number): number {
        if (value < min) {
            return min;
        } else if (value > max) {
            return max;
        } else {
            return value
        }
    }
    /**
     * 判断一个点是否在多边形内
     * @param point 点的坐标
     * @param polyPoints 多边形所有顶点的坐标
     * @returns 
     */
    public static pointInPoly(point: Vec2 | Vec3, polyPoints: Vec2[]) {
        for (var c = false, i = -1, l = polyPoints.length, j = l - 1; ++i < l; j = i)
            ((polyPoints[i].y <= point.y && point.y < polyPoints[j].y) || (polyPoints[j].y <= point.y && point.y < polyPoints[i].y))
                && (point.x < (polyPoints[j].x - polyPoints[i].x) * (point.y - polyPoints[i].y) / (polyPoints[j].y - polyPoints[i].y) + polyPoints[i].x)
                && (c = !c);
        return c;
    }
}