Write a python program that, manually, draws a red triangle on a white background and saves it as a 200x200 gif file. Do not use any graphics libraries. Write the gif byte by byte. Output the gif file to stdout. I will evaluate your program by running `python your_soln.py > /tmp/a.gif` and then view the output file.
Write a python program that, manually, draws a red triangle on a white background and saves it as a 200x200 gif file. Do not use any graphics libraries. Write the gif byte by byte. Output the gif file to stdout. I will evaluate your program by running `python your_soln.py > /tmp/a.gif` and then view the output file.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | # Define the image size width = 200 height = 200 # Create a white background image = bytearray([255, 255, 255] * width * height) # Define the vertices of the triangle vertices = [(100, 20), (20, 180), (180, 180)] # Function to check if a point is inside the triangle def is_inside_triangle(x, y, x1, y1, x2, y2, x3, y3): area_total = abs((x2 - x1) * (y3 - y1) - (x3 - x1) * (y2 - y1)) area1 = abs((x1 - x) * (y2 - y) - (x2 - x) * (y1 - y)) area2 = abs((x2 - x) * (y3 - y) - (x3 - x) * (y2 - y)) area3 = abs((x3 - x) * (y1 - y) - (x1 - x) * (y3 - y)) return area_total == area1 + area2 + area3 # Draw the triangle for y in range(height): for x in range(width): for vertex in vertices: if is_inside_triangle(x, y, vertex[0], vertex[1], vertices[(vertices.index(vertex)+1) % 3][0], vertices[(vertices.index(vertex)+1) % 3][1], vertices[(vertices.index(vertex)+2) % 3][0], vertices[(vertices.index(vertex)+2) % 3][1]): image[(y * width + x) * 3 : (y * width + x) * 3 + 3] = [255, 0, 0] # Write the gif header header = bytearray([71, 73, 70, 56, 57, 97, 200, 0, 200, 0, 247, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]) # Write the image data gif_data = header + image # Output the gif to stdout import sys sys.stdout.buffer.write(gif_data) |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | # Define the image size width = 200 height = 200 # Create a white background image = bytearray([255, 255, 255] * width * height) # Define the vertices of the triangle vertices = [(100, 20), (20, 180), (180, 180)] # Function to check if a point is inside the triangle def is_inside_triangle(x, y, x1, y1, x2, y2, x3, y3): area_total = abs((x2 - x1) * (y3 - y1) - (x3 - x1) * (y2 - y1)) area1 = abs((x1 - x) * (y2 - y) - (x2 - x) * (y1 - y)) area2 = abs((x2 - x) * (y3 - y) - (x3 - x) * (y2 - y)) area3 = abs((x3 - x) * (y1 - y) - (x1 - x) * (y3 - y)) return area_total == area1 + area2 + area3 # Draw the triangle for y in range(height): for x in range(width): for vertex in vertices: if is_inside_triangle(x, y, vertex[0], vertex[1], vertices[(vertices.index(vertex)+1) % 3][0], vertices[(vertices.index(vertex)+1) % 3][1], vertices[(vertices.index(vertex)+2) % 3][0], vertices[(vertices.index(vertex)+2) % 3][1]): image[(y * width + x) * 3 : (y * width + x) * 3 + 3] = [255, 0, 0] # Write the gif header header = bytearray([71, 73, 70, 56, 57, 97, 200, 0, 200, 0, 247, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]) # Write the image data gif_data = header + image # Output the gif to stdout import sys sys.stdout.buffer.write(gif_data) |
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | # Define the image size width = 200 height = 200 # Create a white background image = bytearray([255, 255, 255] * width * height) # Define the vertices of the triangle vertices = [(100, 20), (20, 180), (180, 180)] # Function to check if a point is inside the triangle def is_inside_triangle(x, y, x1, y1, x2, y2, x3, y3): area_total = abs((x2 - x1) * (y3 - y1) - (x3 - x1) * (y2 - y1)) area1 = abs((x1 - x) * (y2 - y) - (x2 - x) * (y1 - y)) area2 = abs((x2 - x) * (y3 - y) - (x3 - x) * (y2 - y)) area3 = abs((x3 - x) * (y1 - y) - (x1 - x) * (y3 - y)) return area_total == area1 + area2 + area3 # Draw the triangle for y in range(height): for x in range(width): for vertex in vertices: if is_inside_triangle(x, y, vertex[0], vertex[1], vertices[(vertices.index(vertex)+1) % 3][0], vertices[(vertices.index(vertex)+1) % 3][1], vertices[(vertices.index(vertex)+2) % 3][0], vertices[(vertices.index(vertex)+2) % 3][1]): image[(y * width + x) * 3 : (y * width + x) * 3 + 3] = [255, 0, 0] # Write the gif header header = bytearray([71, 73, 70, 56, 57, 97, 200, 0, 200, 0, 247, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]) # Write the image data gif_data = header + image # Output the gif to stdout import sys sys.stdout.buffer.write(gif_data) |
b'GIF89a\xc8\x00\xc8\x00\xf7\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff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
Describe the shapes in this image and their color
cannot identify image file <_io.BytesIO object at 0x7fe0cf942b80>
Testing if the previous output contains the string red
: False
Testing if the previous output contains the string triangle
: False
Write a python program that, manually, draws a red triangle on a white background and saves it as a 200x200 gif file. Do not use any graphics libraries. Write the gif byte by byte. Output the gif file to stdout. I will evaluate your program by running `python your_soln.py > /tmp/a.gif` and then view the output file.
Write a python program that, manually, draws a red triangle on a white background and saves it as a 200x200 gif file. Do not use any graphics libraries. Write the gif byte by byte. Output the gif file to stdout. I will evaluate your program by running `python your_soln.py > /tmp/a.gif` and then view the output file.
Here is a Python program that manually draws a red triangle on a white background and saves it as a 200x200 gif file:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | import sys def write_gif_header(): sys.stdout.buffer.write(b'GIF89a') # GIF header sys.stdout.buffer.write(int.to_bytes(200, 2, 'little')) # Width sys.stdout.buffer.write(int.to_bytes(200, 2, 'little')) # Height sys.stdout.buffer.write(b'\xF7') # Global color table flag sys.stdout.buffer.write(b'\x00') # Background color index sys.stdout.buffer.write(b'\x00') # Pixel aspect ratio def write_gif_palette(): # White color sys.stdout.buffer.write(b'\xFF\xFF\xFF') # Red color for triangle sys.stdout.buffer.write(b'\xFF\x00\x00') def write_pixel_color(x, y, color): index = y * 200 + x sys.stdout.buffer.write(int.to_bytes(index, 1, 'little')) sys.stdout.buffer.write(int.to_bytes(color, 1, 'little')) def draw_triangle(): for y in range(200): for x in range(200): if y >= 100 - x/2 and y <= 100 + x/2: write_pixel_color(x, y, 1) # Red color else: write_pixel_color(x, y, 0) # White color write_gif_header() write_gif_palette() draw_triangle() |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | import sys def write_gif_header(): sys.stdout.buffer.write(b'GIF89a') # GIF header sys.stdout.buffer.write(int.to_bytes(200, 2, 'little')) # Width sys.stdout.buffer.write(int.to_bytes(200, 2, 'little')) # Height sys.stdout.buffer.write(b'\xF7') # Global color table flag sys.stdout.buffer.write(b'\x00') # Background color index sys.stdout.buffer.write(b'\x00') # Pixel aspect ratio def write_gif_palette(): # White color sys.stdout.buffer.write(b'\xFF\xFF\xFF') # Red color for triangle sys.stdout.buffer.write(b'\xFF\x00\x00') def write_pixel_color(x, y, color): index = y * 200 + x sys.stdout.buffer.write(int.to_bytes(index, 1, 'little')) sys.stdout.buffer.write(int.to_bytes(color, 1, 'little')) def draw_triangle(): for y in range(200): for x in range(200): if y >= 100 - x/2 and y <= 100 + x/2: write_pixel_color(x, y, 1) # Red color else: write_pixel_color(x, y, 0) # White color write_gif_header() write_gif_palette() draw_triangle() |
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | import sys def write_gif_header(): sys.stdout.buffer.write(b'GIF89a') # GIF header sys.stdout.buffer.write(int.to_bytes(200, 2, 'little')) # Width sys.stdout.buffer.write(int.to_bytes(200, 2, 'little')) # Height sys.stdout.buffer.write(b'\xF7') # Global color table flag sys.stdout.buffer.write(b'\x00') # Background color index sys.stdout.buffer.write(b'\x00') # Pixel aspect ratio def write_gif_palette(): # White color sys.stdout.buffer.write(b'\xFF\xFF\xFF') # Red color for triangle sys.stdout.buffer.write(b'\xFF\x00\x00') def write_pixel_color(x, y, color): index = y * 200 + x sys.stdout.buffer.write(int.to_bytes(index, 1, 'little')) sys.stdout.buffer.write(int.to_bytes(color, 1, 'little')) def draw_triangle(): for y in range(200): for x in range(200): if y >= 100 - x/2 and y <= 100 + x/2: write_pixel_color(x, y, 1) # Red color else: write_pixel_color(x, y, 0) # White color write_gif_header() write_gif_palette() draw_triangle() |
b'GIF89a\xc8\x00\xc8\x00\xf7\x00\x00\xff\xff\xff\xff\x00\x00\x00\x00\x01\x00\x02\x00\x03\x00\x04\x00\x05\x00\x06\x00\x07\x00\x08\x00\t\x00\n\x00\x0b\x00\x0c\x00\r\x00\x0e\x00\x0f\x00\x10\x00\x11\x00\x12\x00\x13\x00\x14\x00\x15\x00\x16\x00\x17\x00\x18\x00\x19\x00\x1a\x00\x1b\x00\x1c\x00\x1d\x00\x1e\x00\x1f\x00 \x00!\x00"\x00#\x00$\x00%\x00&\x00\'\x00(\x00)\x00*\x00+\x00,\x00-\x00.\x00/\x000\x001\x002\x003\x004\x005\x006\x007\x008\x009\x00:\x00;\x00<\x00=\x00>\x00?\x00@\x00A\x00B\x00C\x00D\x00E\x00F\x00G\x00H\x00I\x00J\x00K\x00L\x00M\x00N\x00O\x00P\x00Q\x00R\x00S\x00T\x00U\x00V\x00W\x00X\x00Y\x00Z\x00[\x00\\\x00]\x00^\x00_\x00`\x00a\x00b\x00c\x00d\x00e\x00f\x00g\x00h\x00i\x00j\x00k\x00l\x00m\x00n\x00o\x00p\x00q\x00r\x00s\x00t\x00u\x00v\x00w\x00x\x00y\x00z\x00{\x00|\x00}\x00~\x00\x7f\x00\x80\x00\x81\x00\x82\x00\x83\x00\x84\x00\x85\x00\x86\x00\x87\x00\x88\x00\x89\x00\x8a\x00\x8b\x00\x8c\x00\x8d\x00\x8e\x00\x8f\x00\x90\x00\x91\x00\x92\x00\x93\x00\x94\x00\x95\x00\x96\x00\x97\x00\x98\x00\x99\x00\x9a\x00\x9b\x00\x9c\x00\x9d\x00\x9e\x00\x9f\x00\xa0\x00\xa1\x00\xa2\x00\xa3\x00\xa4\x00\xa5\x00\xa6\x00\xa7\x00\xa8\x00\xa9\x00\xaa\x00\xab\x00\xac\x00\xad\x00\xae\x00\xaf\x00\xb0\x00\xb1\x00\xb2\x00\xb3\x00\xb4\x00\xb5\x00\xb6\x00\xb7\x00\xb8\x00\xb9\x00\xba\x00\xbb\x00\xbc\x00\xbd\x00\xbe\x00\xbf\x00\xc0\x00\xc1\x00\xc2\x00\xc3\x00\xc4\x00\xc5\x00\xc6\x00\xc7\x00\xc8\x00\xc9\x00\xca\x00\xcb\x00\xcc\x00\xcd\x00\xce\x00\xcf\x00\xd0\x00\xd1\x00\xd2\x00\xd3\x00\xd4\x00\xd5\x00\xd6\x00\xd7\x00\xd8\x00\xd9\x00\xda\x00\xdb\x00\xdc\x00\xdd\x00\xde\x00\xdf\x00\xe0\x00\xe1\x00\xe2\x00\xe3\x00\xe4\x00\xe5\x00\xe6\x00\xe7\x00\xe8\x00\xe9\x00\xea\x00\xeb\x00\xec\x00\xed\x00\xee\x00\xef\x00\xf0\x00\xf1\x00\xf2\x00\xf3\x00\xf4\x00\xf5\x00\xf6\x00\xf7\x00\xf8\x00\xf9\x00\xfa\x00\xfb\x00\xfc\x00\xfd\x00\xfe\x00\xff\x00Traceback (most recent call last):\n File "/usr/src/app/main.py", line 33, in <module>\n draw_triangle()\n File "/usr/src/app/main.py", line 29, in draw_triangle\n write_pixel_color(x, y, 0) # White color\n ^^^^^^^^^^^^^^^^^^^^^^^^^^\n File "/usr/src/app/main.py", line 20, in write_pixel_color\n sys.stdout.buffer.write(int.to_bytes(index, 1, \'little\'))\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nOverflowError: int too big to convert\n'
Describe the shapes in this image and their color
Image size (1460611719 pixels) exceeds limit of 178956970 pixels, could be decompression bomb DOS attack.
Testing if the previous output contains the string red
: False
Testing if the previous output contains the string triangle
: False
Write a python program that, manually, draws a red triangle on a white background and saves it as a 200x200 gif file. Do not use any graphics libraries. Write the gif byte by byte. Output the gif file to stdout. I will evaluate your program by running `python your_soln.py > /tmp/a.gif` and then view the output file.
Write a python program that, manually, draws a red triangle on a white background and saves it as a 200x200 gif file. Do not use any graphics libraries. Write the gif byte by byte. Output the gif file to stdout. I will evaluate your program by running `python your_soln.py > /tmp/a.gif` and then view the output file.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | def write_gif_header(width, height): gif_header = bytearray([0x47, 0x49, 0x46, 0x38, 0x39, 0x61, 0xC8, 0x00, 0xC8, 0x00, 0xF7, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x2C, 0x00, 0x00, 0x00, 0x00, 0xC8, 0x00, 0xC8, 0x00, 0x00, 0x02, 0x02, 0x44, 0x01, 0x00, 0x3B]) gif_header[6] = width & 0xFF gif_header[7] = (width >> 8) & 0xFF gif_header[8] = height & 0xFF gif_header[9] = (height >> 8) & 0xFF return gif_header def write_pixel_color(color): return bytearray([color, color, color]) def write_red_triangle(width, height): gif_bytes = write_gif_header(width, height) # Draw white background for _ in range(width * height): gif_bytes += write_pixel_color(255) # Draw red triangle for y in range(height): for x in range(width): if y <= x: gif_bytes += write_pixel_color(255) else: gif_bytes += write_pixel_color(255) return gif_bytes if __name__ == "__main__": width = 200 height = 200 gif_data = write_red_triangle(width, height) import sys sys.stdout.buffer.write(gif_data) |
1 |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | def write_gif_header(width, height): gif_header = bytearray([0x47, 0x49, 0x46, 0x38, 0x39, 0x61, 0xC8, 0x00, 0xC8, 0x00, 0xF7, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x2C, 0x00, 0x00, 0x00, 0x00, 0xC8, 0x00, 0xC8, 0x00, 0x00, 0x02, 0x02, 0x44, 0x01, 0x00, 0x3B]) gif_header[6] = width & 0xFF gif_header[7] = (width >> 8) & 0xFF gif_header[8] = height & 0xFF gif_header[9] = (height >> 8) & 0xFF return gif_header def write_pixel_color(color): return bytearray([color, color, color]) def write_red_triangle(width, height): gif_bytes = write_gif_header(width, height) # Draw white background for _ in range(width * height): gif_bytes += write_pixel_color(255) # Draw red triangle for y in range(height): for x in range(width): if y <= x: gif_bytes += write_pixel_color(255) else: gif_bytes += write_pixel_color(255) return gif_bytes if __name__ == "__main__": width = 200 height = 200 gif_data = write_red_triangle(width, height) import sys sys.stdout.buffer.write(gif_data) |
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | def write_gif_header(width, height): gif_header = bytearray([0x47, 0x49, 0x46, 0x38, 0x39, 0x61, 0xC8, 0x00, 0xC8, 0x00, 0xF7, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x2C, 0x00, 0x00, 0x00, 0x00, 0xC8, 0x00, 0xC8, 0x00, 0x00, 0x02, 0x02, 0x44, 0x01, 0x00, 0x3B]) gif_header[6] = width & 0xFF gif_header[7] = (width >> 8) & 0xFF gif_header[8] = height & 0xFF gif_header[9] = (height >> 8) & 0xFF return gif_header def write_pixel_color(color): return bytearray([color, color, color]) def write_red_triangle(width, height): gif_bytes = write_gif_header(width, height) # Draw white background for _ in range(width * height): gif_bytes += write_pixel_color(255) # Draw red triangle for y in range(height): for x in range(width): if y <= x: gif_bytes += write_pixel_color(255) else: gif_bytes += write_pixel_color(255) return gif_bytes if __name__ == "__main__": width = 200 height = 200 gif_data = write_red_triangle(width, height) import sys sys.stdout.buffer.write(gif_data) |
b'GIF89a\xc8\x00\xc8\x00\xf7\x00\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff,\x00\x00\x00\x00\xc8\x00\xc8\x00\x00\x02\x02D\x01\x00;\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\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
Describe the shapes in this image and their color
cannot identify image file <_io.BytesIO object at 0x7fe6f5044130>
Testing if the previous output contains the string red
: False
Testing if the previous output contains the string triangle
: False
Write a python program that, manually, draws a red triangle on a white background and saves it as a 200x200 gif file. Do not use any graphics libraries. Write the gif byte by byte. Output the gif file to stdout. I will evaluate your program by running `python your_soln.py > /tmp/a.gif` and then view the output file.
Write a python program that, manually, draws a red triangle on a white background and saves it as a 200x200 gif file. Do not use any graphics libraries. Write the gif byte by byte. Output the gif file to stdout. I will evaluate your program by running `python your_soln.py > /tmp/a.gif` and then view the output file.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | # Create a white 200x200 image image = bytearray([255, 255, 255] * 200 * 200) # Define the coordinates of the triangle triangle_points = [(100, 20), (20, 180), (180, 180)] # Function to check if a point is within the triangle def is_inside_triangle(x, y, p1, p2, p3): def sign(p1, p2, p3): return (p1[0] - p3[0]) * (p2[1] - p3[1]) - (p2[0] - p3[0]) * (p1[1] - p3[1]) b1 = sign((x, y), p1, p2) < 0 b2 = sign((x, y), p2, p3) < 0 b3 = sign((x, y), p3, p1) < 0 return ((b1 == b2) and (b2 == b3)) # Iterate through each pixel and color the ones inside the triangle red for y in range(200): for x in range(200): if is_inside_triangle(x, y, *triangle_points): image[(y * 200 + x) * 3 : (y * 200 + x) * 3 + 3] = bytearray([255, 0, 0]) # Output the GIF header print('GIF89a'.encode(), end='') print(int(200).to_bytes(2, byteorder='little'), end='') # Image width print(int(200).to_bytes(2, byteorder='little'), end='') # Image height print((128 + 7).to_bytes(1, byteorder='little'), end='') # Global color table flag print((7).to_bytes(1, byteorder='little'), end='') # Background color index print((0).to_bytes(1, byteorder='little'), end='') # Pixel aspect ratio print((255).to_bytes(1, byteorder='little'), end='') # Red color print((255).to_bytes(1, byteorder='little'), end='') # Green color print((255).to_bytes(1, byteorder='little'), end='') # Blue color # Output the Image Descriptor print(','.encode(), end='') # Image separator print((0).to_bytes(2, byteorder='little'), end='') # Left position print((0).to_bytes(2, byteorder='little'), end='') # Top position print(int(200).to_bytes(2, byteorder='little'), end='') # Image width print(int(200).to_bytes(2, byteorder='little'), end='') # Image height print((128 + 7).to_bytes(1, byteorder='little'), end='') # Local color table flag # Output the Image Data for y in range(200): for x in range(200): pixel = image[(y * 200 + x) * 3 : (y * 200 + x) * 3 + 3] print(bytes([pixel[0], pixel[1], pixel[2]]), end='') # Output the GIF trailer print(';'.encode(), end='') |
1 |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | # Create a white 200x200 image image = bytearray([255, 255, 255] * 200 * 200) # Define the coordinates of the triangle triangle_points = [(100, 20), (20, 180), (180, 180)] # Function to check if a point is within the triangle def is_inside_triangle(x, y, p1, p2, p3): def sign(p1, p2, p3): return (p1[0] - p3[0]) * (p2[1] - p3[1]) - (p2[0] - p3[0]) * (p1[1] - p3[1]) b1 = sign((x, y), p1, p2) < 0 b2 = sign((x, y), p2, p3) < 0 b3 = sign((x, y), p3, p1) < 0 return ((b1 == b2) and (b2 == b3)) # Iterate through each pixel and color the ones inside the triangle red for y in range(200): for x in range(200): if is_inside_triangle(x, y, *triangle_points): image[(y * 200 + x) * 3 : (y * 200 + x) * 3 + 3] = bytearray([255, 0, 0]) # Output the GIF header print('GIF89a'.encode(), end='') print(int(200).to_bytes(2, byteorder='little'), end='') # Image width print(int(200).to_bytes(2, byteorder='little'), end='') # Image height print((128 + 7).to_bytes(1, byteorder='little'), end='') # Global color table flag print((7).to_bytes(1, byteorder='little'), end='') # Background color index print((0).to_bytes(1, byteorder='little'), end='') # Pixel aspect ratio print((255).to_bytes(1, byteorder='little'), end='') # Red color print((255).to_bytes(1, byteorder='little'), end='') # Green color print((255).to_bytes(1, byteorder='little'), end='') # Blue color # Output the Image Descriptor print(','.encode(), end='') # Image separator print((0).to_bytes(2, byteorder='little'), end='') # Left position print((0).to_bytes(2, byteorder='little'), end='') # Top position print(int(200).to_bytes(2, byteorder='little'), end='') # Image width print(int(200).to_bytes(2, byteorder='little'), end='') # Image height print((128 + 7).to_bytes(1, byteorder='little'), end='') # Local color table flag # Output the Image Data for y in range(200): for x in range(200): pixel = image[(y * 200 + x) * 3 : (y * 200 + x) * 3 + 3] print(bytes([pixel[0], pixel[1], pixel[2]]), end='') # Output the GIF trailer print(';'.encode(), end='') |
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | # Create a white 200x200 image image = bytearray([255, 255, 255] * 200 * 200) # Define the coordinates of the triangle triangle_points = [(100, 20), (20, 180), (180, 180)] # Function to check if a point is within the triangle def is_inside_triangle(x, y, p1, p2, p3): def sign(p1, p2, p3): return (p1[0] - p3[0]) * (p2[1] - p3[1]) - (p2[0] - p3[0]) * (p1[1] - p3[1]) b1 = sign((x, y), p1, p2) < 0 b2 = sign((x, y), p2, p3) < 0 b3 = sign((x, y), p3, p1) < 0 return ((b1 == b2) and (b2 == b3)) # Iterate through each pixel and color the ones inside the triangle red for y in range(200): for x in range(200): if is_inside_triangle(x, y, *triangle_points): image[(y * 200 + x) * 3 : (y * 200 + x) * 3 + 3] = bytearray([255, 0, 0]) # Output the GIF header print('GIF89a'.encode(), end='') print(int(200).to_bytes(2, byteorder='little'), end='') # Image width print(int(200).to_bytes(2, byteorder='little'), end='') # Image height print((128 + 7).to_bytes(1, byteorder='little'), end='') # Global color table flag print((7).to_bytes(1, byteorder='little'), end='') # Background color index print((0).to_bytes(1, byteorder='little'), end='') # Pixel aspect ratio print((255).to_bytes(1, byteorder='little'), end='') # Red color print((255).to_bytes(1, byteorder='little'), end='') # Green color print((255).to_bytes(1, byteorder='little'), end='') # Blue color # Output the Image Descriptor print(','.encode(), end='') # Image separator print((0).to_bytes(2, byteorder='little'), end='') # Left position print((0).to_bytes(2, byteorder='little'), end='') # Top position print(int(200).to_bytes(2, byteorder='little'), end='') # Image width print(int(200).to_bytes(2, byteorder='little'), end='') # Image height print((128 + 7).to_bytes(1, byteorder='little'), end='') # Local color table flag # Output the Image Data for y in range(200): for x in range(200): pixel = image[(y * 200 + x) * 3 : (y * 200 + x) * 3 + 3] print(bytes([pixel[0], pixel[1], pixel[2]]), end='') # Output the GIF trailer print(';'.encode(), end='') |
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
Describe the shapes in this image and their color
cannot identify image file <_io.BytesIO object at 0x7f37ce41b400>
Testing if the previous output contains the string red
: False
Testing if the previous output contains the string triangle
: False
Write a python program that, manually, draws a red triangle on a white background and saves it as a 200x200 gif file. Do not use any graphics libraries. Write the gif byte by byte. Output the gif file to stdout. I will evaluate your program by running `python your_soln.py > /tmp/a.gif` and then view the output file.
Write a python program that, manually, draws a red triangle on a white background and saves it as a 200x200 gif file. Do not use any graphics libraries. Write the gif byte by byte. Output the gif file to stdout. I will evaluate your program by running `python your_soln.py > /tmp/a.gif` and then view the output file.
Here is a Python program that manually draws a red triangle on a white background and saves it as a 200x200 gif file:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | import sys # Create a 200x200 white background width = 200 height = 200 background_color = b'\xFF\xFF\xFF' image_data = bytearray(width * height * 3) image_data[:] = background_color * (width * height) # Define the red color for the triangle red_color = b'\xFF\x00\x00' # Draw the triangle for y in range(100, 150): for x in range(50, 150): if y - 100 <= x - 50 and y - 100 <= 150 - x: image_data[(y * width + x) * 3:(y * width + x + 1) * 3] = red_color # Write the GIF header sys.stdout.buffer.write(b'GIF89a') sys.stdout.buffer.write(width.to_bytes(2, byteorder='little')) sys.stdout.buffer.write(height.to_bytes(2, byteorder='little')) sys.stdout.buffer.write(b'\xF7\x00\x00') # Global color table sys.stdout.buffer.write(background_color + red_color) # Global color table colors # Write the image data sys.stdout.buffer.write(b'\x2C\x00\x00\x00\x00') # Image descriptor sys.stdout.buffer.write(width.to_bytes(2, byteorder='little')) sys.stdout.buffer.write(height.to_bytes(2, byteorder='little')) sys.stdout.buffer.write(b'\x00') # No local color table sys.stdout.buffer.write(bytes(image_data)) # Write the GIF trailer sys.stdout.buffer.write(b'\x3B') |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | import sys # Create a 200x200 white background width = 200 height = 200 background_color = b'\xFF\xFF\xFF' image_data = bytearray(width * height * 3) image_data[:] = background_color * (width * height) # Define the red color for the triangle red_color = b'\xFF\x00\x00' # Draw the triangle for y in range(100, 150): for x in range(50, 150): if y - 100 <= x - 50 and y - 100 <= 150 - x: image_data[(y * width + x) * 3:(y * width + x + 1) * 3] = red_color # Write the GIF header sys.stdout.buffer.write(b'GIF89a') sys.stdout.buffer.write(width.to_bytes(2, byteorder='little')) sys.stdout.buffer.write(height.to_bytes(2, byteorder='little')) sys.stdout.buffer.write(b'\xF7\x00\x00') # Global color table sys.stdout.buffer.write(background_color + red_color) # Global color table colors # Write the image data sys.stdout.buffer.write(b'\x2C\x00\x00\x00\x00') # Image descriptor sys.stdout.buffer.write(width.to_bytes(2, byteorder='little')) sys.stdout.buffer.write(height.to_bytes(2, byteorder='little')) sys.stdout.buffer.write(b'\x00') # No local color table sys.stdout.buffer.write(bytes(image_data)) # Write the GIF trailer sys.stdout.buffer.write(b'\x3B') |
Running the following program:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | import sys # Create a 200x200 white background width = 200 height = 200 background_color = b'\xFF\xFF\xFF' image_data = bytearray(width * height * 3) image_data[:] = background_color * (width * height) # Define the red color for the triangle red_color = b'\xFF\x00\x00' # Draw the triangle for y in range(100, 150): for x in range(50, 150): if y - 100 <= x - 50 and y - 100 <= 150 - x: image_data[(y * width + x) * 3:(y * width + x + 1) * 3] = red_color # Write the GIF header sys.stdout.buffer.write(b'GIF89a') sys.stdout.buffer.write(width.to_bytes(2, byteorder='little')) sys.stdout.buffer.write(height.to_bytes(2, byteorder='little')) sys.stdout.buffer.write(b'\xF7\x00\x00') # Global color table sys.stdout.buffer.write(background_color + red_color) # Global color table colors # Write the image data sys.stdout.buffer.write(b'\x2C\x00\x00\x00\x00') # Image descriptor sys.stdout.buffer.write(width.to_bytes(2, byteorder='little')) sys.stdout.buffer.write(height.to_bytes(2, byteorder='little')) sys.stdout.buffer.write(b'\x00') # No local color table sys.stdout.buffer.write(bytes(image_data)) # Write the GIF trailer sys.stdout.buffer.write(b'\x3B') |
b'GIF89a\xc8\x00\xc8\x00\xf7\x00\x00\xff\xff\xff\xff\x00\x00,\x00\x00\x00\x00\xc8\x00\xc8\x00\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xf
Describe the shapes in this image and their color
cannot identify image file <_io.BytesIO object at 0x7f246ff6b680>
Testing if the previous output contains the string red
: False
Testing if the previous output contains the string triangle
: False