At 01:16 PM 3/13/2008 -0700, Warren wrote: >David, > >There is a known problem with Pygame and IDLE. (Something about IDLE not >running the program in a separate process.) If you just run the program form >a command window, or use a different editor (like SPE) you wouldn't see that >problem about closing the window.
Well, it's probably not the TKinter "dueling event loops" problem. (PyGame doesn't use TKinter for its own event loop.) But I do see an FAQ at http://www.pygame.org/wiki/search.php?query=IDLE and the proposed solution is to make sure there is always a call to pygame.quit(). The example in the FAQ doesn't work, but I see what they are trying to do. Here is how I would write the final loop: while True: event = pygame.event.wait() if event.type == pygame.QUIT: break if event.type == pygame.MOUSEBUTTONDOWN: print "Enter new data" pygame.quit() Now there is no problem running from IDLE. >Changing the program so it updates as the calculation is ongoing is certainly >possible. I'll play around with this some more. I'm very pleased with the documentation on PyGame. Without knowing anything about the program, I was able to find the functions and event types used in the snippet above. Many thanks for your help. -- Dave >----- Original Message ---- >From: David MacQuigg <[EMAIL PROTECTED]> >To: Warren Sande <[EMAIL PROTECTED]> >Sent: Thursday, March 13, 2008 2:51:00 PM >Subject: Re: [Edu-sig] Introducing Python to Engineering Students > >At 08:19 PM 3/12/2008 -0700, Warren Sande wrote: > >>By the way, here is a non-OO version of a the fractals program that uses >>Pygame to display the output. > >Very nice! I installed PyGame under Python25/Lib/site-packages, using the >Windows installer from ><http://www.pygame.org/install.html>http://www.pygame.org/install.html, and >ran the script below from my favorite IDE (IDLE). I wish Unix installs would >go so smoothly. > >The only problem I noticed is that the CPU runs 100% and doesn't stop if you >forget to click the X on the PyGame window. When I do click the X, the event >loop stops, but he window remains. If I click the X again, I get Microsoft's >"program is not responding" dialog, and its "please tell Microsoft" follow-on. > There must be a better way to close this window. > >Also, it would be nice if we could show the window as it is being painted, and >allow students to interrupt a long computation and try different coordinates. > >-- Dave > > >>#------------------------- >># Simple fractal program using Pygame to display results >># (Based on Kirby Urner's OO version) >>import pygame, sys >>palette = [(0,0,0)] >> >>def mkpalette(): >> global palette >> for i in range(0,255): >> palette.append((i*5%200 + 20, i*7%200 + 20, i*11%200 + 20)) >> return palette >> >>def compute_fractal(n, uleft_x, uleft_y, lright_x, lright_y): >> global pixels >> xwidth = lright_x - uleft_x >> ywidth = uleft_y - lright_y >> pixels = [] >> for x in range (500): >> pixel_row = [] >> for y in range (500): >> percentx = x/500.0 >> percenty = y/500.0 >> xp = uleft_x + percentx * xwidth >> yp = uleft_y - percenty * ywidth >> z = complex(xp,yp) >> o = complex(0,0) >> dotcolor = 0 >> for trials in range(n): >> if abs(o) <= 2.0: >> o = o**2 + z >> else: >> dotcolor = trials >> break >> pixel_row.append(palette[dotcolor]) >> pixels.append(pixel_row) >> >>mkpalette() >>pixels = [] >>print "computing fractal..." >>compute_fractal(64, -2, 1.25, 0.5, -1.25) >>print "done." >>screen = pygame.display.set_mode((500,500)) >>f_surf = pygame.Surface((500, 500)) >>for x in range(500): >> for y in range(500): >> f_surf.set_at((x, y), pixels[x][y]) >>screen.blit(f_surf, [0,0,500,500]) >>pygame.display.flip() >>while True: >> for event in pygame.event.get(): >> if event.type == pygame.QUIT: >> sys.exit() >>#------------------------- > > > >>----- Original Message ---- >>From: Warren Sande <<mailto:[EMAIL PROTECTED]>[EMAIL PROTECTED]> >>To: <mailto:edu-sig@python.org>edu-sig@python.org >>Sent: Tuesday, March 11, 2008 12:20:02 AM >>Subject: Re: [Edu-sig] Introducing Python to Engineering Students >> >>David, >> >>For output graphics, you might want to have a look at >><<http://www.pygame.org/>http://www.pygame.org/>Pygame. It is a wrapper for >>the SDL library. It has functionality for creating graphics windows, >>drawing, sprites, etc. But what might be of interest for you is the simple >>set_at(x,y) method, to set the color of individual pixels in a window. >> >>I have found the Pygame documentation to be pretty good. >> >>Here is a simple example of plotting a sinewave using set_at() >> >>#----------------------------- >>import pygame, sys, math >>screen = pygame.display.set_mode([640,480]) >>for x in range(0, 640): >> y = int(math.sin(x/640.0 * 4 * math.pi) * 200 + 240) >> screen.set_at([x, y],[255,0,0]) >>pygame.display.flip() >>while True: >> for event in pygame.event.get(): >> if event.type == pygame.QUIT: >> sys.exit() >>#------------------------------ >> >>Warren Sande > > _______________________________________________ Edu-sig mailing list Edu-sig@python.org http://mail.python.org/mailman/listinfo/edu-sig
