图片等比例缩小

2014-10-24 15:14:50 访问(2135) 赞(0) 踩(0)

程序代码：


        /// <summary>
        /// 转换图片的高度和宽度
        /// </summary>
        /// <param name="cur">当前图片的高度和宽度</param>
        /// <param name="allow">页面允许的图片的最大高度和最大宽度</param>
        /// <returns></returns>
        public static WidthHeightClass ConvertWidthHeightClass
            (
                WidthHeightClass cur, 
                WidthHeightClass allow
            )
        {
            int returnHeight = -1;
            int returnWidth = -1;

            if (cur.Width <= allow.Width)
            {
                if (cur.Height <= allow.Height)
                    return cur;

                returnHeight = allow.Height;

                returnWidth = (cur.Width * allow.Height) / cur.Height;

                return new WidthHeightClass(returnWidth, returnHeight);
            }
            else
            {
                if (cur.Height <= allow.Height)
                {
                    returnWidth = allow.Width;

                    returnHeight = (cur.Height * allow.Width) / cur.Width;

                    return new WidthHeightClass(returnWidth, returnHeight);
                }
                else
                {
                    returnWidth = allow.Width;

                    returnHeight = (cur.Height * allow.Width) / cur.Width;

                    if (returnHeight > allow.Height)
                    {
                        returnHeight = allow.Height;

                        returnWidth = (cur.Width * allow.Height) / cur.Height;
                    }
 
                    return new WidthHeightClass(returnWidth, returnHeight);
                }
            }
        }

WidthHeightClass


    /// <summary>
    /// 宽和高的结构
    /// </summary>
    [Serializable]
    public class WidthHeightClass
    {
        /// <summary>
        /// 宽和高的结构
        /// </summary>
        public WidthHeightClass()
        {

        }

        /// <summary>
        /// 宽和高的结构
        /// </summary>
        /// <param name="_Width"></param>
        /// <param name="_Height"></param>
        public WidthHeightClass(int _Width, int _Height)
        {
            m_Width = _Width;

            m_Height = _Height;
        }

        /// <summary>
        /// 宽
        /// </summary>
        protected int m_Width = 0;

        /// <summary>
        /// 宽
        /// </summary>
        public int Width
        {
            get
            {
                return m_Width;
            }
            set
            {
                m_Width = value;
            }
        }

        /// <summary>
        /// 高
        /// </summary>
        protected int m_Height = 0;

        /// <summary>
        /// 高
        /// </summary>
        public int Height
        {
            get
            {
                return m_Height;
            }
            set
            {
                m_Height = value;
            }
        }
    }