Prototyping raw image sequence assignment (2013)
Assignment: In Python, following the techniques shown in the Raw image and Raw image sequence examples, create a 1 second long animation by generating 25 frames of an image sequence and converting them to a GIF. Use just the basics: loops, variables, and if statements.
Rules:
- The code should be "pure" python (just using the standard libraries of python such as struct).
- The code should be no more than 50 lines.
- The images should be 320 x 240 pixels in size.
Results
To be posted / linked to here. Please post both your code (again, PURE python -- no libraries and less than 50 lines) + the resulting image (converted to GIF and uploaded to the wiki).
Luisa
import struct, sys
width = 320
height = 240
header = struct.pack("<BBBHHBHHHHBB",0,0,2,0,0,8,0,0,width,height,32,1<<5)
totalframes = 25
for frame in xrange(totalframes):
out = open("frame%04d.tga" % frame, "wb")
out.write(header)
for y in xrange(height):
for x in xrange(width):
r = (1.0-(float(frame)/totalframes))*255
g = 0
b = 0
a = 255
if x > 80 and x < 160:
g = r
out.write(struct.pack('B', b))
out.write(struct.pack('B', g))
out.write(struct.pack('B', r))
out.write(struct.pack('B', a))
print r
out.close()
Lucia
import struct, sys
width = 320
height = 240
xWhite = 0
header = struct.pack("<BBBHHBHHHHBB",0,0,2,0,0,8,0,0,width,height,32,1<<5)
totalframes = 25
for frame in xrange(totalframes):
frame = frame+1
out = open("frames/frame%02d.tga" % frame, "wb")
out.write(header)
for y in xrange(height):
for x in xrange(width):
xWhite = xWhite +1
if (frame != 1 and xWhite%frame == 0):
r = 255
g = 255
b = 255
a = 255
else:
r = 0
g = 0
b = 0
a = 255
out.write(struct.pack('B', b))
out.write(struct.pack('B', g))
out.write(struct.pack('B', r))
out.write(struct.pack('B', a))
out.close()
A variation (that's actually the original idea - the previous code was 'accidental'):
import struct, sys
width = 320
height = 240
header = struct.pack("<BBBHHBHHHHBB",0,0,2,0,0,8,0,0,width,height,32,1<<5)
totalframes = 25
for frame in xrange(totalframes):
out = open("last/frame_%02d.tga" % frame, "wb")
out.write(header)
for y in xrange(height):
for x in xrange(width):
#if (x%10==0 and x == frame*10):
#line above is redundant either one condition or the other would be enough, so
if ( x == frame*10):
r = 255
g = 255
b = 255
a = 255
else:
r = 0
g = 0
b = 0
a = 255
out.write(struct.pack('B', b))
out.write(struct.pack('B', g))
out.write(struct.pack('B', r))
out.write(struct.pack('B', a))
out.close()
Tamas
|
import math, struct, sys
from math import *
tau = 2 * pi
#computes distance from (x1,y1) to (x2,y2)
def dist(x1, y1, x2, y2):
return sqrt(float((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)))
width = 320
height = 240
nFrames = 25
header = struct.pack("<BBBHHBHHHHBB",0,0,2,0,0,8,0,0,width,height,32,1<<5)
for frame in xrange(nFrames):
output = open("frames/frame%02d.tga" % frame, "wb")
output.write(header)
for y in xrange(height):
for x in xrange(width):
offset = frame * (1.0 / nFrames)
primaryColor = abs(sin((0.2)*tau + (x) / (4.0+8.0*sin((0.2)*pi)))
+ cos((0.2)*tau + (x+y) / (6.0+16.0*cos((0.2)*tau)))
+ sin(dist(x, y, 32*sin(offset*tau)+96, 32*cos(offset*tau)+height / 2) / 24.0) # orbit 1 on left side
+ sin(dist(x, y, 32*cos(offset*tau) + width-96, 32*sin(offset*tau)+height / 2) / 8.0) # orbit 2 on right side
)
r = abs(primaryColor - abs(cos(dist(x + sin(offset*tau), y + 25*sin(offset*tau), width / 2, -2000) / 4.0))) * 48
g = primaryColor * 48 if primaryColor >= 2 else primaryColor * 36 if primaryColor > 0.2 else abs(cos(5.0*dist(x + sin(offset*tau), y + 25*sin(offset*tau), width / 2, -2000) / 4.0)) * 24
b = abs(primaryColor + abs(cos(2000*offset*tau + dist(x + sin(offset*tau), y + sin(offset*tau), width / 2, -2000) / 8.0))) * 48
a = 255
output.write(struct.pack('BBBB', b, g, r, a))
output.close()
|
________________________________________________________________________________________________________________________________________________
Mihail
|
import struct, sys
width = 320
height = 240
header = struct.pack("<BBBHHBHHHHBB",0,0,2,0,0,8,0,0,width,height,32,1<<5)
totalframes = 25
for frame in xrange(totalframes):
out = open("frame_%02d.tga" % frame, "wb")
out.write(header)
for y in xrange(height):
for x in xrange(width):
if y >= 200:
r = 5*(float(frame))
g = y/4+2*(float(frame))
b = 3*(float(frame))
a = 255
elif y <= 75:
r = (x+y)/4+(float(frame)/totalframes)
g = y+2*(float(frame))
b = y+2*(float(frame))
a = 255
else:
r = 5+5*(float(frame)/totalframes)
g = y-2*(float(frame))
b = 4*(float(frame))
a = 255
out.write(struct.pack('B', b))
out.write(struct.pack('B', g))
out.write(struct.pack('B', r))
out.write(struct.pack('B', a))
out.close()
|
Lídia
import struct, sys
import random
width = 320
height = 240
header = struct.pack("<BBBHHBHHHHBB", 0, 0, 2, 0, 0, 8, 0, 0, width, height, 32, 1 << 5)
totalFrames = 25
largeColumns = (width/5) - 25
smallColumns = 25
for frame in xrange(totalFrames):
out = open("frame%04d.tga" % frame, "wb")
out.write(header)
attempt = random.randint(height/7, height/1.2)
attempt1 = random.randint(10,90)
cor = random.randint(55,255)
for y in xrange(height):
for x in xrange(5):
for n in xrange(largeColumns):
r, g, b, a = 0, 0, 0, 255
if y <= attempt:
r, g = 55, 255
b = (frame + 1) * 10
else:
r = 155
out.write(struct.pack('B', b))
out.write(struct.pack('B', g))
out.write(struct.pack('B', r))
out.write(struct.pack('B', a))
for x in xrange(smallColumns):
r, g, b, a = 0, 0, 0, 255
if y < attempt1:
b = 155
if y > attempt1 and y < 200:
b = cor
else:
b = 90
out.write(struct.pack('B', b))
out.write(struct.pack('B', g))
out.write(struct.pack('B', r))
out.write(struct.pack('B', a))
out.close()
max
import struct, sys
import os
out = sys.stdout
width = 320
height = 240
ysquare = 0
header = struct.pack("<BBBHHBHHHHBB",0,0,2,0,0,8,0,0,width,height,32,1<<5)
out.write(header)
totalframes = 25
for frame in xrange(totalframes):
frame = frame+1
filename = ("frame%02d.tga" % frame )
out = open(filename, "wb")
out.write(header)
for y in xrange(height):
for x in xrange(width):
ysquare = ysquare +1
if (frame != 1 and ysquare%frame == 0):
r = 0
b = 0
g = 0
a = 0
if y <= 240 and x %2:
r = 255
b = 255
g = 255
a = 255
else:
r = 0
g = 0
b = 0
a = 255
out.write(struct.pack('B', b))
out.write(struct.pack('B', g))
out.write(struct.pack('B', r))
out.write(struct.pack('B', a))
out.close()
Group - Lucia, Luisa, Lídia, Mihail
Idea: draw several white diagonals on black background. The diagonals should move across the background and be made not of continuous lines, but of dashed lines.
import struct, sys
width = 320
height = 240
xWhite = 0
header = struct.pack("<BBBHHBHHHHBB",0,0,2,0,0,8,0,0,width,height,32,1<<5)
totalframes = 25
for frame in xrange(totalframes):
frame = frame+1
out = open("frames/frame%02d.tga" % frame, "wb")
out.write(header)
for y in xrange(height):
for x in xrange(width):
xWhite = xWhite +1
if (y%10>=0 and y%10<5 ):
r = 0
g = 0
b = 0
a = 255
else:
if (xWhite%11 == 0):
r = 255
g = 255
b = 255
a = 255
else:
r = 0
g = 0
b = 0
a = 255
out.write(struct.pack('B', b))
out.write(struct.pack('B', g))
out.write(struct.pack('B', r))
out.write(struct.pack('B', a))
out.close()
Nikos (w. Michael)
# rawimagesequence.py
import struct, sys
width = 320
height = 240
header = struct.pack("<BBBHHBHHHHBB",0,0,2,0,0,8,0,0,width,height,32,1<<5)
totalframes = 25
def map(x, startend, newstartnewend):
start, end = startend
newstart, newend = newstartnewend
p = (float(x) - start) / (end - start)
return newstart + (p * (newend-newstart))
for frame in xrange(totalframes):
out = open("frame%02d.tga" % frame, "wb")
out.write(header)
for y in xrange(height):
for x in xrange(width):
r = map(frame, (0, totalframes), (255, 0))
g = map(frame, (0, totalframes), (0, 255))
b = 0
a = 255
out.write(struct.pack('B', b))
out.write(struct.pack('B', g))
out.write(struct.pack('B', r))
out.write(struct.pack('B', a))
print r
out.close()
import os
os.system("convert frame* nik.gif")
Elleke
import struct, sys, random
width = 320
height = 240
header = struct.pack("<BBBHHBHHHHBB",0,0,2,0,0,8,0,0,width,height,32,1<<5)
totalframes = 25
r = 0
g = 0
b = 0
a = 255
for frame in xrange(totalframes):
out = open("frame%04d.tga" % frame, "wb")
out.write(header)
for y in xrange(height):
for x in xrange(width):
r = random.randint(0, 30)
g = random.randint(0, 30)
b = random.randint(0, 30)
out.write(struct.pack('B', b))
out.write(struct.pack('B', g))
out.write(struct.pack('B', r))
out.write(struct.pack('B', a))
print r
out.close