On 2011-10-05, Westley Martínez wrote: > On Wed, Oct 05, 2011 at 02:29:38PM +0100, Adam Funk wrote:
>> I only know PyGame because we did an exercise in recreating the old >> breakout game and messing around with it at a local Python group. >> >> I was under the mistaken impression from that exercise that you have >> to maintain a set of all the objects on the screen and redraw them all >> every time through the loop that ends with pygame.display.flip() --- >> *but* I now see that the loop starts with these: >> >> clock.tick(tick_rate) >> screen.fill((0,0,0)) >> # comes from screen = >> pygame.display.set_mode((screen_width,screen_height)) >> # before the loop >> >> and that I was then deleting hit bricks, calculating the new positions >> of the balls, and then redrawing everything that was left on the >> secondary screen because things were moving around and disappearing. >> >> I guess if I don't clear the screen at the beginning of the loop but >> just blit pixels onto it, when I call display.flip(), it will add the >> new blittings to what was already there? If that's true, this will be >> much easier than I thought. > Yep. Blitting is replacing the old colors with new colors. It doesn't > replace colors unless you tell it to. My mistake was in sample code, running with it, & not looking at it too closely. ;-) -- Mathematiker sind wie Franzosen: Was man ihnen auch sagt, übersetzen sie in ihre eigene Sprache, so daß unverzüglich etwas völlig anderes daraus wird. [Goethe] -- http://mail.python.org/mailman/listinfo/python-list
