/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="originalPath">源图路径</param>
/// <param name="thumbnailPath">生成后缩略图路径</param>
/// <param name="toWidth">目标宽度</param>
/// <param name="toHeight">目标高度</param>
/// <param name="thumbsType">生成类型</param>
/// <returns></returns>
public static bool ThumbsImage(string originalPath, string thumbnailPath, int toWidth, int toHeight, ThumbsType thumbsType)
{
return(ThumbsImage(GetBitmap(originalPath), thumbnailPath, toWidth, toHeight, thumbsType));
}
/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="originalImage">源图</param>
/// <param name="thumbnailPath">缩略图路径（物理路径）</param>
/// <param name="toWidth">最终缩略图宽度</param>
/// <param name="toHeight">最终缩略图高度</param>
/// <param name="thumbsType">生成缩略图的方式</param>
public static bool ThumbsImage(Image originalImage, string thumbnailPath, int toWidth, int toHeight, ThumbsType thumbsType)
{
int num = toWidth;
int num2 = toHeight;
int num3 = toWidth;
int num4 = toHeight;
int x = 0;
int y = 0;
int num5 = originalImage.Width;
int num6 = originalImage.Height;
int x2 = 0;
int y2 = 0;
switch (thumbsType)
{
case ThumbsType.Fill:
num4 = toHeight;
num3 = num4 * num5 / num6;
if (num3 > toWidth)
{
num4 = num4 * toWidth / num3;
num3 = toWidth;
}
x2 = (toWidth - num3) / 2;
y2 = (toHeight - num4) / 2;
break;
case ThumbsType.HeightAndWidth:
num4 = (num2 = originalImage.Height * toWidth / originalImage.Width);
num3 = (num = originalImage.Width * toHeight / originalImage.Height);
break;
case ThumbsType.Width:
num4 = (num2 = originalImage.Height * toWidth / originalImage.Width);
break;
case ThumbsType.Height:
num3 = (num = originalImage.Width * toHeight / originalImage.Height);
break;
case ThumbsType.Cut:
if ((double)originalImage.Width / (double)originalImage.Height > (double)num / (double)num2)
{
num6 = originalImage.Height;
num5 = originalImage.Height * num / num2;
y = 0;
x = (originalImage.Width - num5) / 2;
}
else
{
num5 = originalImage.Width;
num6 = originalImage.Width * toHeight / num;
x = 0;
y = (originalImage.Height - num6) / 2;
}
break;
}
Bitmap bitmap = new Bitmap(num, num2);
Graphics graphics = Graphics.FromImage(bitmap);
graphics.InterpolationMode = InterpolationMode.High;
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.CompositingQuality = CompositingQuality.HighQuality;
graphics.InterpolationMode = InterpolationMode.High;
if (thumbnailPath.EndsWith(".png", true, CultureInfo.CurrentCulture))
{
graphics.Clear(Color.Transparent);
}
else
{
graphics.Clear(Color.White);
}
graphics.Clear(Color.White);
graphics.DrawImage(originalImage, new Rectangle(x2, y2, num3, num4), new Rectangle(x, y, num5, num6), GraphicsUnit.Pixel);
try
{
return(CompressImage(bitmap, thumbnailPath));
}
catch
{
return(false);
}
finally
{
bitmap.Dispose();
graphics.Dispose();
}
}
/// <summary>
/// 缩小图片
/// </summary>
/// <param name="filePath">文件路径</param>
/// <param name="width">缩略图宽</param>
/// <param name="height">缩略图高</param>
/// <param name="type">缩放方式</param>
/// <returns></returns>
public static bool Resize(string filePath, int width, int height, ThumbsType type)
{
return(ThumbsImage(GetBitmap(filePath), FileHelper.GetTruePath(filePath), width, height, type));
}