I'm building the 2D interactive graphics engine for mobile platforms. The focus is on authoring all of content on phone/tablet.
Instead of using bitmaps/meshes, the user starts with single primitive (y < 0 half-plane) and applies series of transformations (wrap, intersect, linear transform...) to sculpture it into desired shape. This scene description looks and behaves both like JSON tree and S-expressions.
For interactivity, I would like to have a lisp-like language that's visualized as tree. The user would execute 'macros' to modify existing code, for example to wrap a function into a loop or to make a mirror reflection of existing graphics. The host should make sure that code is always syntactically correct and should provide default primitives when constructing new code, that will be replaced or modified by user.
