First, the preparation of knowledge
Now that there are more and more WP8.1 phones with different screen sizes, this requires us to consider this when designing the UI. In WP, the proportional factor (a scale factor) can solve the problem very well, and in the Microsoft system of the pc/tablet/mobile phone is done. Scale factor is based on the physical mobile phone screen size and other parameters calculated, there are specific calculation formula, not described here.
Second, what we need to do
1, provide the bitmap image to the system zoom
For example, on the page, there is an image control to show the image, we need to provide it with a relative scale factor in the system file in order to show the same clarity on different screen sizes.
This document is to be continued.
wp8.1 Study9: Adjust UI for different screen and phone orientations