On Tue, Sep 27, 2011 at 2:13 AM, Mac Ryan <quasipe...@gmail.com> wrote:
> On Sun, 25 Sep 2011 11:41:19 -0400 > Christopher Night <cosmologi...@gmail.com> wrote: > > > Suppose the current transformation is (x, y) -> (0.1x, 0.1y). What > > pygame Rect will the following correspond to (after all the > > coordinates are coerced to ints)? > > Could you please articulate a bit more? I'm not sure I followed. From > your post it seems to me that you are imagining a two-way > transformation in which you use model-scaled data to the draw > function (draw a 150 metres radius circle) and you also get > model-scaled data when you query the object (what is the size of the > bounding rect for the circle? --> 300 metres). > > What I am talking about is just a "one-way" transformation that convert > the input of the drawing functions. In pseudocode: > > >>> init_surface(scale_factor=0.1) > >>> draw_circle(radius=150) > >>> get_size_bounding_rect() > ... 30x30 > That's how I understood it... I'm not sure what I said that made it sound like I was thinking of a two-way transformation.... Let me try rephrasing my question using your notation. Please tell me what the following would output (where I have question marks), and tell me if you don't understand what I mean by the pseudocode: >>> init_surface(scale_factor = 0.1) >>> r1 = myrect(0, 0, 108, 10) >>> r1.left = 4 >>> fill_rect(r1) >>> get_size_bounding_rect() ??? x ??? I assume it would either be 10x1 or 11x1. Do you understand my question now? -Christopher
