public async Task DownloadQueryImage(string url, bool resizeIfBigger = true)
{
try
{
Uri uri = new Uri(url);
if (uri.IsFile)
{
string correctedImageLocalTempFile = url;
bool imageModified = false;
if (resizeIfBigger)
{
var r = ImageEditor.ResizeIfBiggerAndFixOrientation(url);
correctedImageLocalTempFile = r.Item1;
imageModified = r.Item2;
}
this.DownloadedImageUri = new Uri(correctedImageLocalTempFile);
this.IsQueryImageModified = true; // local files are always "modified", so that we send them with the query
}
else
{
using (System.Net.Http.HttpClient client = new System.Net.Http.HttpClient())
{
var response = await client.GetAsync(uri);
var tempFileName = System.IO.Path.GetTempFileName();
byte[] bytes = await response.Content.ReadAsByteArrayAsync();
System.IO.File.WriteAllBytes(tempFileName, bytes);
string correctedImageLocalTempFile = tempFileName;
bool imageModified = false;
if (resizeIfBigger)
{
var r = ImageEditor.ResizeIfBiggerAndFixOrientation(tempFileName);
correctedImageLocalTempFile = r.Item1;
imageModified = r.Item2;
}
this.DownloadedImageUri = new Uri(correctedImageLocalTempFile);
this.IsQueryImageModified = imageModified; // if image was not modified (resized or orientation fixed, we will mark it so. This will control sending image vs image url)
}
}
this.TransformedImageUri = this.DownloadedImageUri;
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.ToString());
}
}
public static Tuple <string, bool> ResizeIfBiggerAndFixOrientation(string srcImageFile, int targetWidthHeight = 1000) // This method checks if an image needs to be resized or rotated and does so
{
using (var srcBitmap = new Bitmap(srcImageFile))
{
int srcWidth = srcBitmap.Width;
int srcHeight = srcBitmap.Height;
bool imageNeedsResize = false;
int n = srcWidth > srcHeight ? srcWidth : srcHeight;
if (n > targetWidthHeight)
{
imageNeedsResize = true;
} // for images smaller than target set, target is updated to the larger dimension
bool imageRotated = ImageEditor.FixImageOrientation(srcBitmap);
if (imageNeedsResize || imageRotated) // If the image needs to be resized or rotated, do so
{
var modifiedBitmap = srcBitmap; // modifiedBitmap is either already rotated and/or needs resizing
if (imageNeedsResize) // Resize the image if needed
{
// re-read dimensions
srcWidth = modifiedBitmap.Width;
srcHeight = modifiedBitmap.Height;
n = srcWidth > srcHeight ? srcWidth : srcWidth;
int dstWidth = srcWidth * targetWidthHeight / n;
int dstHeight = srcHeight * targetWidthHeight / n;
modifiedBitmap = ImageEditor.ResizeImage(modifiedBitmap, dstWidth, dstHeight);
}
var retValString = Path.GetTempFileName();
modifiedBitmap.Save(retValString, ImageFormat.Jpeg);
modifiedBitmap.Dispose();
return(new Tuple <string, bool>(retValString, true));
}
// no rotation or resize required
return(new Tuple <string, bool>(srcImageFile, false));
}
}
public static string RotateImage(string srcImageFile, float theta) // This method handles the location of an image loaded from the internet
{
if (theta == 0.0) // If there's no rotation needed, just output the original image
{
return(srcImageFile);
}
using (var srcBitmap = new Bitmap(srcImageFile)) // Create a new rotated version of the image
{
var rotatedBitmap = ImageEditor.RotateImage(srcBitmap, theta);
var retValString = Path.GetTempFileName();
rotatedBitmap.Save(retValString, ImageFormat.Jpeg);
rotatedBitmap.Dispose();
return(retValString);
}
}
