Shark.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Drawing;

namespace Fishy
{
    class Shark
    {
        /// <summary>
        /// 鲨鱼类
        /// </summary>
        public Rectangle Rectangle { get; set; }
        //定义左右上下移动的速度
        private int SpeedX;
        private int SpeedY;
        //定义矩形
        public Shark(Rectangle rec)
        {
            Rectangle = rec;
            SpeedX = +8;
            SpeedY = -8;
        }
        //定义嘴的矩形
        public Rectangle MouthRectangle
        {
            get
            {
                if(SpeedX<0)
                {
                    return new Rectangle(Rectangle.X + Rectangle.Width - 50, Rectangle.Y + Rectangle.Height - 25, 50, 50);
                }
                else
                {
                    return new Rectangle(Rectangle.X, Rectangle.Y + Rectangle.Height - 25, 50, 50);
                }
            }
        }
        /// <summary>
        /// 画鲨鱼并定义转向
        /// </summary>
        /// <returns></returns>
        private Image OtherImage()
        {
            //向左
            if(SpeedX<0)
                return (Image)Properties.Resources.SharkL.Clone();
            Image img = (Image)Properties.Resources.SharkL.Clone();
            //向右
           img.RotateFlip(RotateFlipType.RotateNoneFlipX);
            return img;
        }
        //画鲨鱼
        public void Draw(Graphics g)
        {
            g.DrawImage(OtherImage(), Rectangle);
        }
        //鲨鱼的移动以及到边界转向再随机出现