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).

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):
                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()