Re: [pygame] Capabilities of Pygame
FORTRAN is still used in some circles because it's still very fast for number crunching. A bit off topic, but I've seen this bit of folk wisdom repeated online for a long time and have always been skeptical. How does a C command that gets compiled to a CPU's MUL instruction differ in any way from a Fortran command that also gets compiled to that same CPU's same MUL instruction? Honest question. Alan
Re: [pygame] man oh man Java is painful
(though I understand Java is capable of as good or better performance than C/C++) In execution speed, yes. In RAM usage and startup time, definitely not. Alan
Re: [pygame] trajectory
i would like to know what are the common way to handle trajectory in a 2d game. http://hyperphysics.phy-astr.gsu.edu/hbase/traj.html
Re: [pygame] Resolution for a 2d game
Please don't force a fullscreen resolution. It doesn't restore properly on dual-head setups. Agreed. Even on single screens it often repositions other running apps' windows. A real nuisance. Alan
Re: [pygame] Resolution for a 2d game
For example, someone who play in 800*600 will move one side of the screen to another faster than someone who play in 1280*800... I really dont know how to handle several resolution especially for my online game. Track all positions in floating point and multiply them by a different scaling factor depending on resolution? OpenGL somewhat automates this, and you get nice filtered scaling on your sprites, too. Alan
Re: [pygame] frame independant movement
In other words, use a small enough time step that the difference is not big enough to be a problem. But if you're doing that, you might as well pick one sufficiently small time step and use a variable number of them per frame, so that the physics is always predictable whatever the frame rate. While we're on the time topic, is there an easy way to do slo-mo, a la Peggle Extreme Fever or a Burnout multi-car pileup? Alan
Re: [pygame] frame independant movement
The nice thing about limiting the framerate versus having calculations be done based on time passed is that it is much more consistent. With dt calculations you will often get huge jumps on slower computers and extra slow movement in cases on fast machines, just do to inaccuracies and error in the calculation. On a slower machine, no matter which timing method you use it will be unpleasant. What kind of innacuracies, specifically? One method for having a smooth variable framerate, without the issues of variable time calculations, is to have a fixed time step. Each frame, you may process more than one timestep, if you need to in order to keep up. The timestep has a fixed amount of time it is supposed to similate, say, .02, which would be 60 times per second. If the user is able to run at 60 fps, they get very smooth animation, as only one step is occuring on each frame. If the user can only run at 30 fps, they will get two steps each frame, so it will be jerkier, but still accurate. If they can only run at 10 fps, you would set a limit on it (maybe the max is two timesteps in a frame), so things would be slower for them but maybe still playable. [code snipped] Is anyone aware of any websites that describe this time/frame business pictorially? I have read about it repeatedly and browsed a lot of pseudocod over the years, but without a proper diagram it's not really sinking in for a visual thinker like myself. Alan
Re: [pygame] Speed up image.tostring with OpenGL ?
The only other way I know how to make OpenGL textures is with NumPy, using the GL_FLOAT token. This may be better for your purposes--although the way I see it, converting a surface to a texture is going to involve a conversion no matter which way you do it. Note that it's much faster to *update* a texture rather than create a new one. If at all possible, this may be your best opinion to improve speed. I'm very skeptical that PyOpenGL actually works correctly. On my box (old 2.4 GHz laptop w/geforce 4), the classic nehe lesson 42 (drawing a maze to a texture) python port gives HORRIBLE framerates, judging by eye to be about 5 fps, no matter whether I'm using Python 2.4, 2.5, 2.6, and I've tried repeated reinstalls and upgrades of PyOpenGL. The maze drawing always stops prematurely too, but that may be a logic bug in the ported version. Has anyone else duplicated this problem? The original C version of lesson 42 works at full frame rate. My self-written programs have really bad framerates too, but I barely understand OpenGL so it's possible those are my own fault. Alan
Re: [pygame] Make a sprite fall with realistic gravity?
I've been trying to get a sprite (the ball) to fall from the top of the screen with realistic gravity. I did attempt it, however it's not so great so I won't post it here. These might help: http://hyperphysics.phy-astr.gsu.edu/hbase/traj.html http://www.makingthemodernworld.org/learning_modules/maths/04.TU.02/?section=1 Alan
Re: [pygame] audio programming with pygame?
i would like to learn how to program simple synthesizers and sound effects and it would be nice if i could experiment with this in python. Along these lines, does anyone know of a way to: 1. write VSTs in Python (Steinberg Virtual Synthesizer format) 2. drive existing VSTs from Python I don't have a current need for it, but I was curious in case the need arose at some point. Alan
Re: [pygame] Help Starting/doing The Main Code
Well, I want to make an action platformer game like the metroid series, mega man series, castlevania series etc.I already have the sprites and the music, just need to know how to program the main code. I've looked at the code of many games, but each one of them was written differently... and no one of them had a weapon for the player to use. All of them were just platformers, jump and dodge.I have no idea of where to start... This is pretty dated, but may help: http://www.fastgraph.com/makegames/sidescroller/ Alan
Re: [pygame] Anybody think they can help me with my small problem?
def check_mouse(self,mouse): m1 = mouse[0] m2 = mouse[1] Can you just divide m1 and m2 by 100? Alan
Re: [pygame] Anybody think they can help me with my small problem?
Okay I took your idea Alan and I finally got the outcome that I wanted. Thanks. Not sure you got what I meant :) If you divide the mouse coordinate by 100, you'll automatically either get a 0, 1, or 2 as the result. No need for any kind of in range(0,50) comparison at all. Alan
Re: [pygame] [Pygame] Generating a map
talking a little recently about random terrain generation. One technique worth looking at is Perlins noise, one way of implementing which is to draw various surfaces full of random data, overlay them with different weights, and use the result to decide gameplay features such as the height of terrain. After a LOT of trial and error, I managed to implement a proper Perlin noise routine and draw a heightfield with it. Run main2D.py. I was surprised at how slow it is. Alan#http://freespace.virgin.net/hugo.elias/models/m_perlin.htm #~ http://www.noisemachine.com/talk1/17.html import random import math #=== p=[x for x in range(100)] random.shuffle(p) rg=[x/16.0 for x in range(100)] random.shuffle(rg) g=[ (math.cos(x), math.sin(x) ) for x in rg] def noiser(x): return g[x % 100] def noiser2(x,y): return g[ ( x + p[y%100] ) %100 ] #=== #=== #=== def interpolatednoiser(n): intn = int(n) fracn = n - intn v1=noiser(intn) / 100.0 v2=noiser(intn + 1) / 100.0 ft = fracn * math.pi#cos interp f = (1.0 - math.cos(ft)) * .5 return v1*(1-f) + v2*f def interpolatednoiser2(x, y): intx = int(x) fracx = x - intx inty = int(y) fracy = y - inty gx, gy = noiser2(intx, inty) v1 = (gx*fracx) + (gy*fracy) gx, gy = noiser2(intx + 1, inty) v2 = (gx*(fracx-1)) + (gy*fracy) gx, gy = noiser2(intx, inty +1) v3 = (gx*fracx) + (gy*(fracy-1)) gx, gy = noiser2(intx + 1, inty + 1) v4 = (gx*(fracx-1)) + (gy*(fracy-1)) ftx = fracx * math.pi#cos interp fx = (1.0 - math.cos(ftx)) * .5 midx1= v1*(1-fx) + v2*fx midx2 = v3*(1-fx) + v4*fx fty = fracy * math.pi#cos interp fy = (1.0 - math.cos(fty)) * .5 return (midx1*(1.0-fy)) + (midx2 * fy) #=== #=== #=== def perlin1(x,oct=6,per=0.7): total=0 j=0 for i in range(oct): freq = 2**i amp = per**(i*2) j = interpolatednoiser( x * freq) * amp total += j return total def perlin2(x, y, oct=6,per=0.9): total=0 for i in range(oct): freq = 2**i amp = per**i #(i*2) total += interpolatednoiser2( x * freq, y*freq) * amp return total #=== #=== #=== def testperlin1(): for x in range(25): y=perlin1(x, 4) z=int(y*50) print y def testperlin2(): for y in range(10): row = [] for x in range(10): z = perlin2(x/4.0,y/4.0, 4) row.append(z) print %3.3f %(z,), print if __name__ == __main__: #print p #print g #testperlin1() testperlin2() import pygame import math from pygame.locals import * import perlin def main(): pygame.init() screen = pygame.display.set_mode((1024,768) ) stretch=50.0 zoom=6 octaves=4 persist=0.7 minc=255 maxc=0 screen.fill( (0,0,0) ) for y in range(400): for x in range (400): p=perlin.perlin2(x/stretch, y/stretch, octaves, persist ) #*(y/400.0) ) z = p*170 +128 #- 30 #classic c=int(z) if cmaxc: maxc=c if cminc: minc=c if c255: c=255 if c=0: c=0 pygame.draw.line(screen, (c,c,c), (x+y/3, y + 20), (x+y/3, y + (20-(z/4))) ) #grayscale screen.set_at( (x+512,y), (c,c,c) ) pygame.display.update() event = pygame.event.poll() if event.type == QUIT or (event.type == KEYDOWN and event.key == K_ESCAPE): break print minc:, minc, maxc:,maxc while 1: event = pygame.event.wait() if event.type == QUIT or (event.type == KEYDOWN and event.key == K_ESCAPE): break if (event.type == KEYDOWN and event.key == K_o): octaves += 1 main()
Re: [pygame] Path finding demo, now with more fugu
Just put a path finding demo on my website, that you may find interesting. http://www.willmcgugan.com/2007/04/20/swim-fugu-swim/ Works great, although it pegs the cpu at 100% :) Alan
Re: [pygame] Scripting language
I've been reading up on perspective broker since you emailed it and I think a solution of that sort is the most likely that I will end up with. Also check out a competing but lesser known technology: Ice from http://www.zeroc.com/ Alan
Re: [pygame] PyOpenGL
The whole Numeric / numarray / numpy / scipy thing is getting a bit confusing. I agree. Bloody nightmare. Alan
Re: [pygame] movie
hello, I am new to pygame and I want to make a very short movie(25secs tops) it requires a snake to twist and turn, and change direction. how can I do this? Brian One way is to do it like Windows Mystify screensaver. You know the one I'm talking about? Use a list to hold the current position of the head, body, body, body, body, tail pieces. Alan
Re: [pygame] Sky Algorithm
Let's say I have a simple flat bitmap, and I wish to tile it across a 3d plane and suspend it in the air, so it looks like cloud cover. I could 'drag' those tiling perspective corrected bitmaps about to simulate it pretty well, I believe, but I don't want to use OpenGL to do it. Without OpenGL I'm thinking you're stuck with software rendering. This was one of the top hits on google using search terms raycaster texture mapped floor plane. Plenty of pictures and explanations. http://student.kuleuven.be/~m0216922/CG/raycasting2.html Alan
