Re: [pygame] question about Rect objects

[Jake b <ninmonkeys@xxxxxxxxx>]

Maps that use tilesets, like super nintendo/nes RPG's store the tile ID number for each tile. Map is a 2d array of ID's. This takes almost no memory, since if you have 100 tiles, with 2 types of tiles, you end up with 2 images loaded. vs redundant Sprites on every square.

source_x = tile_width * ID
source_rect = Rect( source_x, 0, tile_width, tile_height )

The pinman tutorials use tiles as well, just not in a grid. At game start, it creates a rectangle filled Sprite using Color. Then in the loop, it draws the pre-rendered surface.

This is because re-creating a new surface, every loop, is slow. It has some SpriteGroup examples that can make the other tut easier to read.

http://www.sacredchao.net/~piman/writing/sprite-tutorial.shtml

And probably overkill for now, but sometime you'll want NumPy. Reading 'quick intro' section is enough. Good page for a quickref to numpy.
http://www.scipy.org/Tentative_NumPy_Tutorial

On Tue, May 18, 2010 at 8:12 PM, Alex Hall <mehgcap@xxxxxxxxx> wrote:

Okay, so to sprite or not to sprite... More reading. In the meantime,
do you have a place where I can find an example of drawing a grid of
Rects? Also, I would still like to put a rect into a boardSquare
object (an object I have defined) so I can call something like
board[i][j].Rect.changeColor(red) where changeColor is a method I
implement. Is this not possible / a huge waste of resources? Again, I
come with no prior experience or reference for anything like this.
Thanks for answering my newbie questions. :)

On 5/18/10, Greg Ewing <greg.ewing@xxxxxxxxxxxxxxxx> wrote:
> Alex Hall wrote:
>> Can Pygame detect
>> where on the grid that is with some sort of onImageClick type method,
>> or do I have to track coordinates?
>
> Just track coordinates. For a regular grid, it's very easy. If the
> user clicks at (x, y) and the size of your grid cell is (w, h), then
> the coordinates of the clicked cell are (x // w, y // h).
>
>> Looks like I have to do a lot more reading on sprites.
>
> I wouldn't bother with sprites. Just loop over your grid coordinates,
> calculate the pixel coordinates of the corresponding rect for each
> cell, and fill it with the appropriate colour.
>
>> maybe define a
>> blue, red, and white rect
>
> Rects don't have colours, they just hold coordinates. You only need
> one rect. The colour is specified when you make the call to draw it.
>
> --
> Greg
>

--

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

-- 
Jake