responsive paint web app

Is about a clasic Paint application made in JavaScript and using canvas. The application must work in desktops and mobiles. At the moment is almost done, but it is still missing some advanced features: --Web camera implementation for the responsive view: The Idea is that the user can take a picture with the camera and the picture is loaded in the canvas for modifications later. -- When the user open a picture in a responsive view, it needs to keep proportions, either in portrait view or landscape view. --When the user rotate the screen in the mobile, the canvas needs to keep proportions so that the picture doesnt distorsion. --The selection tool, is still not working. The idea of this tool is to draw an area where the user can move with the finger (or the mouse) or do any opperation with the selected tool in that area. All the operations and the code already done are in the following link [login to view URL] you can see the app working and the issues I have mentioned above.