Asp.Net中圖片大小的縮放
來源：互聯網
上載者：User
在Asp.Net中顯示圖片的時候，如果給定一個固定大小的容器，如<Table>，圖片的大小如何根據容器的大小進行比例縮放呢。以下是一個比較簡單的函數，根據圖片的寬高比例進行計算，縮放後保持比例不變。 //ViewSize 外框大小
//ImageSize 圖片的實際大小
public Size Resize(Size ViewSize, Size ImageSize)
{
Size MySize = new Size();
if(ViewSize.Width > ViewSize.Height)//寬大於高
{
if(ImageSize.Width > ImageSize.Height)//按比例
{
float scale = ImageSize.Height / (float)ImageSize.Width;
if(ViewSize.Height / (float)ViewSize.Width < scale)
{
MySize.Height = ViewSize.Height;
MySize.Width = (int)(ViewSize.Height / scale);
}
else
{
MySize.Width = ViewSize.Width;
MySize.Height = (int)(ViewSize.Width * scale);
}
}
else if(ImageSize.Height > ImageSize.Width)//非比例
{
float scale = ImageSize.Width / (float)ImageSize.Height;
MySize.Height = ViewSize.Height;
MySize.Width = (int)(ViewSize.Height * scale);
}
else//正方
{
MySize.Height = ViewSize.Height;
MySize.Width = ViewSize.Height;
}
}
else if(ViewSize.Width < ViewSize.Height)//高大於寬
{
if(ImageSize.Width < ImageSize.Height)//按比例
{
float scale = ImageSize.Width / (float)ImageSize.Height;
if(ViewSize.Width / (float)ViewSize.Height < scale)
{
MySize.Width = ViewSize.Width;
MySize.Height = (int)(ViewSize.Width / scale);
}
else
{
MySize.Height = ViewSize.Height;
MySize.Width = (int)(ViewSize.Height * scale);
}
}
else if(ImageSize.Height < ImageSize.Width)//非比例
{
float scale = ImageSize.Height / (float)ImageSize.Width;
MySize.Width = ViewSize.Width;
MySize.Height = (int)(ViewSize.Width * scale);
}
else//正方
{
MySize.Height = ViewSize.Width;
MySize.Width = ViewSize.Width;
}
}
else//正方
{
if(ImageSize.Width > ImageSize.Height)//寬大於高
{
float scale = ImageSize.Height / (float)ImageSize.Width;
MySize.Width = ViewSize.Width;
MySize.Height = (int)(ViewSize.Width * scale);
}
else if(ImageSize.Width < ImageSize.Height)//高大於寬
{
float scale = ImageSize.Width / (float)ImageSize.Height;
MySize.Height = ViewSize.Height;
MySize.Width = (int)(ViewSize.Height * scale);
}
else//正方
{
MySize.Height = ViewSize.Height;
MySize.Width = ViewSize.Height;
}
}
return MySize;
}
