Re: [pygame] question about Rect objects

[Alex Hall <mehgcap@xxxxxxxxx>]

Interesting idea. Is there a way of resizing an image? For example, if
the user has a 10x10 grid, each square will be bigger than on a 15x15
grid. Also, I will need to catch keyboard keys (mostly ctrl-m, space,
enter, and space/enter with modifiers) as well as mouse clicks
(differentiating between left and right) for each square. So maybe you
left click a square, or move to it and press ctrl-m. Can Pygame detect
where on the grid that is with some sort of onImageClick type method,
or do I have to track coordinates?
Looks like I have to do a lot more reading on sprites. I heard the
concept and coding is more difficult than basic Pygame. Oh, you
mentioned using rects even with sprites; I am not sure why, then, I
would not just use colored rects in the first place, maybe define a
blue, red, and white rect and then just overwrite the current rect
with the appropriate color by changing the new rect's left/top
arguments? Again, I am quite new to this; I have not even done it in
another language as I have done with other things, so I am coming at
it with no reference. Thanks!

On 5/18/10, Jason M. Marshall <jmm0@xxxxxxxxx> wrote:
> Alex,
>
> In your situation, I would approach the problem differently. I think that
> the sprite module's Group class and Sprite class would save you some time.
>
> If I were creating your GUI, I would pre-draw red, blue, and white images.
> Then, I would make a Sprite for each square on your grid. I would make
> references to the Sprite in two locations. First, I would put each Sprite in
> a position in a 2D array. (I would implement this 2D array as a list of
> lists; there's no need to be fancy.) Second, I would add every sprite to a
> Group. For each sprite, a Rect would represent the Sprite's position and
> size on the screen; this Rect would be assigned to Sprite.rect. The state of
> each square (hit, miss, etc.) would be indicated by changing the
> Sprite.image attribute to the appropriate pre-drawn image.
>
> Jason
>
>
>
> ________________________________
> From: Alex Hall <mehgcap@xxxxxxxxx>
> To: pygame-users@xxxxxxxx
> Sent: Mon, May 17, 2010 11:24:15 PM
> Subject: [pygame] question about Rect objects
>
> Hi all,
> I am new to this list. A quick intro:
> I am a blind college student studying for a computer science degree. I
> use Jaws for Windows from Freedom Scientific to read the content of my
> computer screen. I have a bit of vision, enough to see high-contrast
> colors in a big enough window (500x500 or larger is good).
> I use Python2.6 with the latest release of Pygame. I am trying to add
> a visual element to a Battleship game I wrote last year. Originally,
> the game was all based on screen readers; the user could arrow around
> and their screen reader (the program that reads text on the computer)
> would announce which square they were on and the status of that
> square, among other information. No visuals were needed since most
> screen readers offer an API which I can interface with directly.
> However, I want to expand this to a 2-player, online game so my
> sighted friend and I can play against each other. Of course, for that,
> I need to give him something to look at.
>
> I am trying to generate a grid of rectangles, each rect a square on
> the classic Battleship grid. All rects will start out gray, and will
> then change color as the game progresses (red=hit, white=miss,
> blue=enemy sighted). I have a Square class, which has variables like
> firedOn or ship. That way I can examine the square on which the user
> fired, change its firedOn from False to True, and say something like
> "if(grid[i][j].ship!=None): #change color to red". You get the idea.
>
> Anyway, the pygame documentation says rect cannot be subclassed. Is
> there any way, then, for me to put a rect object in my Square class,
> then draw the grid using my grid (a 2d array of Squares)? I guess what
> I want is to say:
> bg.replace_ip(red, grid[i][j].rect) #change fired-on grid square to
> red and redraw it
> after building my grid of rects? I am quite new to Pygame, and this is
> my first time venturing into the world of generating shapes and grids;
> up to now, my involvement in visual elements has been some
> experimenting with wxPython and XRC, and that package does most of the
> layout for you. Any help with this grid problem would be greatly
> appreciated, and please tell me if my above question and explanation
> do not make sense (as I doubt they will).
>
> --
> Have a great day,
> Alex (msg sent from GMail website)
> mehgcap@xxxxxxxxx; http://www.facebook.com/mehgcap
>
>
>
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap@xxxxxxxxx; http://www.facebook.com/mehgcap