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游戏开发中--角度-方向计算

发布时间：2017-08-15 08:27查看次数：3663

/**
 * 计算角度类
 */
class jisuan {
    public constructor() {
    }
    /**
     * 计算目标坐标在左边值的那个方向
     * 当前位置X
     * 当前位置Y
     * 目标位置X
     * 目标位置Y
     */
    public static getFangXiang(x: number, y: number, endX: number, endY: number): string {
        //求弧度
        var returnNumber: number = Math.atan2(endY - y, endX - x);
        //求角度
        var N = returnNumber * 180 / Math.PI;
        var Z: string = "无";
        if (endY == x && endY == y) {
            return Z;
        } else {
            if (N <= 20 && N >= -20) {
                Z = "右";
            } else if (N <= 110 && N >= 70) {
                Z = "下";
            } else if (N <= -160 || N >= 160) {
                Z = "左";
            } else if (N <= -70 && N >= -110) {
                Z = "上";
            } else if (N < 70 && N > 20) {
                Z = "右下";
            } else if (N < 160 && N > 110) {
                Z = "左下";
            } else if (N < -110 && N > -160) {
                Z = "左上";
            } else if (N < -20 && N > -70) {
                Z = "右上";
            }
            return Z;
        }
    }
    /***
     * 求角度
     * 方向 换算角度
     */
    public static getJiaoDu(fangxian: string): number {
        var N = 0;
        switch (fangxian) {
            case "上":
                N = 0
                break;
            case "右上":
                N += 45
                break;
            case "右":
                N += 90
                break;
            case "右下":
                N += 135
                break;
            case "下":
                N += 180
                break;
            case "左下":
                N += 225
                break;
            case "左":
                N += 270
                break;
            case "左上":
                N += 315
                break;
                default:
                N = 0;
                break
        }
        return N;
    }
    /**
     * 取下一个移动坐标值
     * 当前坐标 X
     * 当前坐标 Y
     * 移动方向  
     * 移动速度  
     */
    public static getNestPosition(x: number, y: number, fangxian: string, speed: number):Array<Object> {
        switch (fangxian) {
            case "上":
                y -= speed;
                break
            case "下":
                y += speed;
                break
            case "左":
                x -= speed;
                break
            case "右":
                y += speed;
                break
            case "左上":
                y -= speed;
                x -= speed;
                break
            case "右上":
                y -= speed;
                x += speed;
                break
            case "左下":
                y += speed;
                x -= speed;
                break
            case "右下":
                y += speed;
                x += speed;
                break
            default:
                y -= speed;
                break
        }
        var t_array = []
        t_array['x'] = x
        t_array['y'] = y;
        return t_array;
   
}