public static System.Drawing.Image CreateThumbnail(this System.Drawing.Image original, int percentage)
{
if (percentage < 1)
{
throw new ArgumentNullException("percentage", "缩放比例不能小于1%");
}
return(original.CreateThumbnail(((int)((original.Width * 0.01f) * percentage)), ((int)((original.Height * 0.01f) * percentage))));
}
public static System.Drawing.Image CreateThumbnail(this System.Drawing.Image original, string widthCondition, string heightCondition)
{
int width = 0;
int num2 = 0;
string str = "";
int height = 0;
int num4 = 0;
string str2 = "";
if (widthCondition.StartsWith("="))
{
str = "=";
if (widthCondition.EndsWith("%"))
{
num2 = (int)((int.Parse(widthCondition.Substring(1).TrimEnd(new char[] { '%' })) * original.Width) * 0.01);
}
else
{
num2 = int.Parse(widthCondition.Substring(1));
}
}
else
{
str = "<=";
if (widthCondition.EndsWith("%"))
{
num2 = (int)((int.Parse(widthCondition.Substring(2).TrimEnd(new char[] { '%' })) * original.Width) * 0.01);
}
else
{
num2 = int.Parse(widthCondition.Substring(2));
}
}
if (heightCondition.StartsWith("="))
{
str2 = "=";
if (heightCondition.EndsWith("%"))
{
num4 = (int)((int.Parse(heightCondition.Substring(1).TrimEnd(new char[] { '%' })) * original.Height) * 0.01);
}
else
{
num4 = int.Parse(heightCondition.Substring(1));
}
}
else
{
str2 = "<=";
if (heightCondition.EndsWith("%"))
{
num4 = (int)((int.Parse(heightCondition.Substring(2).TrimEnd(new char[] { '%' })) * original.Height) * 0.01);
}
else
{
num4 = int.Parse(heightCondition.Substring(2));
}
}
float num5 = ((float)num4) / ((float)original.Height);
float num6 = ((float)num2) / ((float)original.Width);
if ((str == "=") && (str2 == "="))
{
width = num2;
height = num4;
}
else if (str == "=")
{
int num7 = (int)(original.Height * num6);
width = num2;
height = (num7 <= num4) ? num7 : num4;
}
else if (str2 == "=")
{
int num8 = (int)(original.Width * num5);
width = (num8 <= num2) ? num8 : num2;
height = num4;
}
else
{
if ((original.Width <= num2) && (original.Height <= num4))
{
return(original);
}
float num9 = (num6 >= num5) ? num5 : num6;
width = (int)(original.Width * num9);
height = (int)(original.Height * num9);
}
return(original.CreateThumbnail(width, height));
}
