Develop Reference

how to set image width dynamically in windows phone 8.1?

I want to set width to dynamically added button background image.
this is my code
Buttob btn=new Button();
ImageBrush brush1 = new ImageBrush();
brush1.ImageSource = new BitmapImage(new Uri("ms-px:///Assets/emptyseat.jpg"));
btn.Background = brush1;
how to set width of the above image dynamically.

You can scale the image by creating a ScaleTransform object and applying it to the imageBrush, and setting the Stretch property on your brush to whatever it is you desire.
For example:
Button btn = new Button();
ImageBrush brush1 = new ImageBrush();
brush1.ImageSource = new BitmapImage(new Uri("ms-appx:///Assets/emptyseat.jpg"));
ScaleTransform scaleTransform = new ScaleTransform();
scaleTransform.ScaleX = 0.5;
brush1.Transform = scaleTransform;
brush1.Stretch = Stretch.Uniform;
btn.Background = brush1;
It's not entirely clear what you are trying to achieve but the above will resize the image for you.

Set position of pushpin - BingMaps

On my windows store app, im using a bings maps, and im trying to add a pushpin with an image
to do so , im doing this piece of code
Bing.Maps.Location center = new Bing.Maps.Location();
center.Latitude = 40.130066068147585;
center.Longitude = -8.338623046875;
Map.Center = center;
Map.ZoomLevel = 12D;
var pushpinLayer = new MapLayer();
pushpinLayer.Name = "PushPinLayer";
Map.Children.Add(pushpinLayer);
var location = new Location(40.130066068147585D, -8.338623046875D);
Image pinImage = new Image();
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.UriSource = new Uri("ms-appx:///Assets/POI_Red_Ipad#2x.png", UriKind.RelativeOrAbsolute);
pinImage.Width = 20;
pinImage.Height = 30;
pinImage.Source = bitmapImage;
pushpinLayer.Children.Add(pinImage);
it adds the pushpin image but it appears on the top left corner of the map, i dont know how to set its position to use the localtion variable :\

Ok so you just have things a little out of order. The first part is correct:
Bing.Maps.Location center = new Bing.Maps.Location();
center.Latitude = 40.130066068147585;
center.Longitude = -8.338623046875;
Map.Center = center;
Map.ZoomLevel = 12D;
Next, instead of creating a maplayer you would instead create your pushpin image:
Image pinImage = new Image();
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.UriSource = new Uri("ms-appx:///Assets/POI_Red_Ipad#2x.png", UriKind.RelativeOrAbsolute);
pinImage.Width = 20;
pinImage.Height = 30;
pinImage.Source = bitmapImage;
Then you can create your location:
var location = new Location(40.130066068147585D, -8.338623046875D);
Here is where it is different. You do not need to create an instance of the MapLayer class, instead assign the element (image in your case) and location - then add it to to the map.
MapLayer.SetPosition(pinImage, location);
Map.Children.Add(pinImage);

Printing XPS document with image. Different image size when set different dpi

I printing XPS document with images, that contains QR-codes.
Image creating sample here:
Image image = CreatePresentation(qrCode);
image.Height = 200;
image.Width = 200;
image.HorizontalAlignment = HorizontalAlignment.Center;
image.VerticalAlignment = VerticalAlignment.Center;
image.Stretch = Stretch.None;
where
public static Image CreatePresentation(System.Drawing.Image source)
{
Stream stream = new MemoryStream();
source.Save(stream, ImageFormat.Png);
Image image = new Image();
BitmapImage src = new BitmapImage();
src.BeginInit();
src.StreamSource = stream;
src.EndInit();
image.Source = src;
return image;
}
When i have monitor dpi=96 then image size on printed page (on paper after printing) more larger than when i have montor dpi=120.
How i can print images with the same size on different dpi?

When i replaced
image.Stretch = Stretch.None;
on
image.Stretch = Stretch.Fill;
image began print correct

How to get Image height and width issue in windows phone 7

I am trying to get the height and width of an image in windows phone...but there are few syntax errors
how should i do this?
int hight = image1.ActualHeight;
int width = image1.ActualWidth;
BitmapImage img = new BitmapImage(image1.Image);
BitmapImage newImg = new BitmapImage(hight,width);

To create an image,
<Image x:Name="image1" Source="myPicture.png" />
And then you can access it in your code behind
double height = image1.ActualHeight;
double width = image1.ActualWidth;
And there is no constructor for BitmapImage class which takes the arguments that you are passing. You can create a new BitmapImage in either of the following ways
BitmapImage bmp = new BitmapImage(new Uri("myPicture.jpg", UriKind.RelativeOrAbsolute));
or
BitmapImage bmp = new BitmapImage();
bmp.UriSource = new Uri("myPicture.jpg", UriKind.RelativeOrAbsolute);
or
BitmapImage bitmapImage = image1.Source as BitmapImage;
Hope this clears your doubt

Convert BitmapImage to System.Windows.Media.Brush

How would I convert a BitmapImage to a System.Windows.Media.Brush?
I have a BitmapImage imaginatively called bitmap, and I have a Canvas (also imaginatively titled) canvas. How would I set the value of canvas to the value of bitmap?
I've tried canvas.Background = bitmap;, but that didn't work: image.Source = bitmap; works for images, but not Canvases: and ImageSourceConverter imgs = new ImageSourceConverter();
canvas.SetValue(Image.SourceProperty, imgs.ConvertFromString(bitmap.ToString()));
didn't work either.All of these worked with images, however.Maybe something with bitmap.ToString() would work?

Create an ImageBrush and use that as the background:
ImageBrush ib = new ImageBrush();
ib.ImageSource = bitmap;
canvas.Background = ib;

Simply:
canvas.Background = new ImageBrush(bitmap);