图片缩放转换类

在处理图片显示的时候，我们经常会用到图片的缩放功能。

 

    /// <summary>

    /// 图片大小规格变换工具

    /// </summary>

    public sealed class ZoomPicture

    {

        /// <summary>

        /// 缩放图片

        /// </summary>

        /// <param name="srcPicPath">来源图片文件完整路径</param>

        /// <param name="tagPicPath">目标图片文件完整路径</param>

        /// <param name="width">目标图片宽度</param>

        /// <param name="height">目标图片高度</param>

        public static void SmallPicture(string srcPicPath, string tagPicPath, int width, int height)

        {

            System.Drawing.Bitmap objPic, objNewPic;

            try

            {

                objPic = new System.Drawing.Bitmap(srcPicPath);

                objNewPic = new System.Drawing.Bitmap(objPic, width, height);

                objNewPic.Save(tagPicPath);

            }

            catch (Exception exp)

            {

                throw exp;

            }

            finally

            {

                objPic = null;

                objNewPic = null;

            }

        }



        /// <summary>

        /// 按比例缩放图片

        /// </summary>

        /// <param name="srcPicPath">来源图片文件完整路径</param>

        /// <param name="tagPicPath">目标图片文件完整路径</param>

        /// <param name="proportion">缩小比例0～100</param>

        public static void SmallPicture(string srcPicPath, string tagPicPath, int proportion)

        {



            System.Drawing.Bitmap objPic, objNewPic;

            try

            {

                objPic = new System.Drawing.Bitmap(srcPicPath);

                int width = objPic.Width * proportion / 100;

                int intHeight = (width / objPic.Width) * objPic.Height;

                objNewPic = new System.Drawing.Bitmap(objPic, width, intHeight);

                objNewPic.Save(tagPicPath);



            }

            catch (Exception exp)

            {

                throw exp;

            }

            finally

            {

                objPic = null;

                objNewPic = null;

            }

        }



        /// <summary>

        /// 按宽度比例缩放图片，自动计算高度

        /// </summary>

        /// <param name="srcPicPath">来源图片文件完整路径</param>

        /// <param name="tagPicPath">目标图片文件完整路径</param>

        /// <param name="intWidth">目标图片宽度</param>

        public static void SmallPictureForWidth(string srcPicPath, string tagPicPath, int intWidth)

        {



            System.Drawing.Bitmap objPic, objNewPic;

            try

            {

                objPic = new System.Drawing.Bitmap(srcPicPath);

                int intHeight = (intWidth / objPic.Width) * objPic.Height;

                objNewPic = new System.Drawing.Bitmap(objPic, intWidth, intHeight);

                objNewPic.Save(srcPicPath);



            }

            catch (Exception exp)

            {

                throw exp;

            }

            finally

            {

                objPic = null;

                objNewPic = null;

            }

        }



        /// <summary>

        /// 按高度比例缩放图片，自动计算宽度

        /// </summary>

        /// <param name="srcPicPath">来源图片文件完整路径</param>

        /// <param name="tagPicPath">目标图片文件完整路径</param>

        /// <param name="intHeight">目标图片高度</param>

        public static void SmallPictureForHeight(string srcPicPath, string tagPicPath, int intHeight)

        {



            System.Drawing.Bitmap objPic, objNewPic;

            try

            {

                objPic = new System.Drawing.Bitmap(srcPicPath);

                int intWidth = (intHeight / objPic.Height) * objPic.Width;

                objNewPic = new System.Drawing.Bitmap(objPic, intWidth, intHeight);

                objNewPic.Save(tagPicPath);



            }

            catch (Exception exp)

            {

                throw exp;

            }

            finally

            {

                objPic = null;

                objNewPic = null;

            }

        }



    }