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;
}
}
}