/// <summary>
/// 執行裁減
/// </summary>
/// <param name="imgInfo">AJAX傳過來的參數</param>
/// <param name="savePath">儲存路徑(虛擬)</param>
/// <param name="sourceImage">原圖片</param>
private static void DoCrop(ImgUploadInfo imgInfo, string savePath, Image sourceImage)
{
var sectionModal = new
{
x1 = 0,
y1 = 0,
x2 = 0,
y2 = 0,
width = 0,
height = 0,
imgControlWidth = 0.0f,
imgControlHeight = 0.0f
};
var section = JsonConvert.DeserializeAnonymousType(imgInfo.Section, sectionModal);
//判斷使用者是否有選取切割範圍
if (section.height == 0 && section.width == 0)
{
sourceImage.Save(HttpContext.Current.Server.MapPath(savePath));
}
else
{
//由於控制項的大小與圖片實際大小會有出入，因此取得其差異;
var ScaleX = sourceImage.Width / section.imgControlWidth;
var ScaleY = sourceImage.Height / section.imgControlHeight;
//設定實際儲存用的參數
int ActualX = (int)(section.x1 * ScaleX);
int ActualY = (int)(section.y1 * ScaleY);
int ActualWidth = (int)(section.width * ScaleX);
int ActualHeight = (int)(section.height * ScaleY);
//建立新的BitMap物件
Bitmap bitmap = new Bitmap(ActualWidth, ActualHeight);
var fromR = new Rectangle(ActualX, ActualY, ActualWidth, ActualHeight);
var toR = new Rectangle(0, 0, ActualWidth, ActualHeight);
Graphics g = Graphics.FromImage(bitmap);
g.Clear(Color.White);
GraphicsUnit units = GraphicsUnit.Pixel;
g.DrawImage(sourceImage, toR, fromR, units);
bitmap.Save(HttpContext.Current.Server.MapPath(savePath));
}
}
/// <summary>
/// 執行裁減
/// </summary>
/// <param name="imgInfo">AJAX傳過來的參數</param>
/// <param name="savePath">儲存路徑(虛擬)</param>
public void ProcessCrop(ImgUploadInfo imgInfo, out string savePath)
{
Stream imageStream = null;
try
{
if (imgInfo.Image != null)
{
savePath = GetGuidImageSavePath(imgInfo.Image);
imageStream = imgInfo.Image.InputStream;
}
else
{
savePath = GetGuidImageSavePath(imgInfo.ImageUrl);
imageStream = GetUrlImgStream(imgInfo.ImageUrl);
}
using (var sourceImage = Image.FromStream(imageStream))
{
if (!string.IsNullOrEmpty(imgInfo.Section))
{
DoCrop(imgInfo, savePath, sourceImage);
}
else
{
sourceImage.Save(HttpContext.Current.Server.MapPath(savePath));
}
}
}
catch (Exception e)
{
savePath = null;
}
finally
{
if (imageStream != null)
{
imageStream.Close();
imageStream.Dispose();
imageStream = null;
}
}
}
