This challenge involves drawing pictures on a screen or generating image files. For pure ASCII art contests, use [ascii-art] instead. If participants can choose between graphics and ASCII art, use both tags. For images as input, use [image-processing].
95
votes
24answers
13k views
Appease Your Google Overlords: Draw the “G” Logo
Write a program or function that takes in a positive integer N, and outputs an N×N pixel image of Google's "G" logo according to this* construction:
For example, if N is 400, a 400×...
4
votes
1answer
286 views
Fabulous glamour shot
Found this picture on the web today. Being a lazy programmer, I don't want to actually open google and type a couple of characters. Way too much work! This is such an important task that it should be ...
26
votes
1answer
343 views
Build an aesthetically pleasing divisor tree
An aesthetically pleasing divisor tree is a tree of divisors of input n that, for any composite number m, has two children nodes that are the pair of divisors that are closest to the square root of m. ...
16
votes
6answers
589 views
Simulate a Rubik's cube
A Rubik's cube has 6 colors: red, orange, yellow, white, blue, and green. Red and orange, yellow and white, and blue and green faces are on opposite sides.
Net of a solved Rubik's cube looks like ...
0
votes
1answer
255 views
Write an xkcd feed bot
The new xkcd feed bot room gave me an idea for a simple challenge.
Your code will have to monitor the xkcd website and output all the new comics to the user.
Specs
When first run it should just sit ...
35
votes
9answers
3k views
Quixels - Quantum Pixels
Introduction
A quixel is a quantum pixel. Similar to a classical pixel, it is represented with 3 integer values (Red, Green, Blue). However, quixels are in a super position of these 3 states instead ...
7
votes
5answers
532 views
Draw the Union Jack
Preface
There are many "draw x flag" challenges, and upon searching it turns out there are no challenges to draw the union Jack! I feel like this would be a harder flag to draw but it should still be ...
93
votes
7answers
3k views
Exponentially Slimy Programming: Stacking Minecraft Slimes
Slimes are cube shaped enemies in Minecraft that break into multiple smaller versions of themselves when killed. For the purposes of this challenge we'll depict them as an 8×8 pixel image with 3 ...
5
votes
2answers
450 views
Draw a Fibonacci Network!
What are Fibonacci networks?
In 1202, an Italian mathematician known as Fibonacci posed the following problem:
"A male and a female rabbit are born at the beginning of the year. We assume the ...
12
votes
5answers
367 views
Algebraic curve plotter
An algebraic curve is a certain "1D subset" of the "2D-plane" that can be described as set of zeros {(x,y) in R^2 : f(x,y)=0 }of a polynomial f. Here we consider the 2D-plane as the real plane R^2 ...
2
votes
2answers
332 views
Make a sprite-sheet from all the Stack Exchange sites' favicons
Your goal in this code golf is to compile all the Stack Exchange sites' favicons.
Getting the Domains
The domains you will be using will be:
*.stackexchange.com
stackexchange.com
stackoverflow.com
...
9
votes
6answers
421 views
Reverse Bayer Filter of an image
Almost all digital camera sensors are organized in a grid of photosensors. Each photo sensor is sensitive for one of the primary colors: red, green and blue. The way those photo sensors are organized ...
8
votes
3answers
499 views
Draw the EU Estimated Sign
The specification of the "estimated" sign used by the European Union Directive (U+212e in Unicode, which you may not simply print for this challenge) is quite precise.
To copy some restrictions from ...
76
votes
65answers
17k views
Draw the national flag of Iceland
This year's UEFA Euro 2016 is over and besides a couple of negative headlines there has been a very positive surprise as well – the Iceland national football team. Let's draw their national flag.
...
19
votes
2answers
434 views
Borders of overlapping circles
Given the coordinates of several points on a plane, and the radius of a circle surrounding each point, draw polygons representing the circles and the edges where the circles meet. Straight edges will ...
24
votes
4answers
853 views
Rotate a hypercube
Introduction
A hypercube/tesseract is the 4 dimensional equivalent of a normal cube. It's made by taking a cube net, extending it to the 3rd dimension, then – using the 4th dimension – folding it ...
40
votes
3answers
1k views
Computer Generated Cracked Soil
Write a program that takes in an integer from 0 to 65535 (216-1) and generates a unique 500×500 pixel image that looks as similar as possible to these 6 real life images of cracked soil:
...
26
votes
9answers
1k views
Generate a “GitHub” Avatar
Background / Description
Note: as @HelkaHomba points out, the actual GitHub identicons are not actually random but based on the hash of a username
The default GitHub avatar is a 5x5-pixel image. A ...
10
votes
1answer
288 views
Recursive Steiner Chains
Steiner Chains are a set of N circles where each circle is tangent to 2 other non-intersecting circles as well as the the previous and next circles of the chain, as seen in the below images:
In ...
17
votes
10answers
1k views
Compress your code in an image
This is a quine variation.
Introduction
We all write short code, because some obscure reasons, but whatever we do, the'll take up at least 144 pixels/byte (with a 12px font). But what would happen, ...
27
votes
1answer
499 views
Gasket Weaving - draw a Sierpiński knot
Given an integer N >= 2, produce an image showing a Sierpiński knot of degree N.
For example, here are knots of degree 2, 3, 4 and 5:
Click on the images to view full size (the higher the degree the ...
7
votes
2answers
358 views
Outline a PNG image
Intro (semi fictional)
I'm the solo developer of a game, I'm already struggling with character design as is. Hence I've thought of a smart solution, I'll just use images for regular monsters, outline ...
5
votes
1answer
240 views
Tiling by substitution
EDIT: The incorrect A rhomb substitution has been fixed. Apologies to anoyone who had started working on a solution.
Consider the following substitutions, where the substituted rhomb(us) is scaled up ...
29
votes
9answers
1k views
Between the Lines
While doodling around on square-ruled paper the other day, I came up with the above negative-space font for digits. In case you haven't spotted it yet, the spaces between the above shapes yield the ...
23
votes
3answers
1k views
Rainbowlify An Image
This challenge is about gradually shifting hues in an image to make pretty pictures like this:
(original)
Challenge
Write a program or function that takes in two non-negative integers and an image ...
10
votes
3answers
680 views
Draw a simple cube
We don't have a single challenge about drawing a real 3 dimensional cube, so here it goes:
Challenge
Your task is to draw a rotated, cube with perspective. It can be in a separate window or as an ...
4
votes
4answers
580 views
Box-256 Assembly - BIG SQUARE II
I'd like to start a series of challenges for http://box-256.com/ starting with the first challenge, “BIG SQUARE II”. After this one I'll add another for "CHECKERBOARD" and so on.
Rules:
Complete the ...
13
votes
3answers
949 views
Create a pie chart
The challenge is simple:
Create a pie-chart based on a number of input values.
The input will be a list of positive numbers, decimal or integers, and the output will be a pie-chart where each of the ...
11
votes
3answers
509 views
Draw a spiral in a box
This geometric spiral looks complicated, but it's fairly simple to draw; take the following box:
Draw a straight line between the corner of the box and some set distance above the next corner counter-...
22
votes
3answers
783 views
Draw a random hexa-glyph
The above image is called a hexa-glyph. Hexa-glyphs are some cool patterns I made up while doodling during my DiffEq class. Here's how you make one:
Consider the following set of points, shaped ...
13
votes
16answers
3k views
Invert png image
Create program or function that takes file name as an argument or reads it from standard input, and completes the following task:
Read image from a png file (name given as argument).
Reverse colors ...
-6
votes
4answers
207 views
Graph an equation!
Please note that this question is different from this question. This one asks for graphical output, while the other one asks for ascii art.
Objective
Help! Timmy's graphing calculator broke! His ...
22
votes
29answers
3k views
Draw the rainbow
The challenge is simple: Draw a rainbow in as few bytes as possible
The specs for the rainbow are as follows:
The figure must be exactly 400 pixels wide and 200 pixels high (optionally 401x201 if ...
3
votes
1answer
301 views
What time is it again? [closed]
The Inspiration
The Challenge
I'm tired of seeing the same old-same old clock in my top-right-hand corner of my screen. It's time for a new clock. While the clock clock sated my lack of interesting ...
12
votes
3answers
578 views
Fill the holes in letters
Sometimes when I'm bored, I take some text and fill the "holes" in the letters. But isn't filling the holes the most boring thing you can do? I think we should automate it, so we could use our time ...
29
votes
3answers
3k views
Dank Meme Generator
I like making dank memes out of my own images. But all those so called "quick meme" sites just have too much code. I realized that the only way to make the dankest meme generator is to ask you guys at ...
20
votes
30answers
3k views
Build a chessboard
Saw this in a PHP challenge. The objective is to make a chessboard with 64 squares (8*8) with the minimum amount of code.
Simple enough, I made mine in PHP in 356 bytes (not impressive, I know) and I ...
83
votes
9answers
3k views
Patch the Image
In a popular image editing software there is a feature, that patches (The term used in image processing is inpainting as @mınxomaτ pointed out.) a selected area of an image, based on the information ...
189
votes
34answers
28k views
Paint Starry Night, objectively, in 1kB of code
Below is a 386x320 png representation of van Gogh's Starry Night.
Your goal is to reproduce this image as closely as possible, in no more than 1024 bytes of code. For the purposes of this challenge, ...
22
votes
6answers
1k views
Triangular Ulam spiral
We've had a couple of challenges about the Ulam spiral. But that's not enough.
In this challenge we will plot a triangular Ulam spiral (as opposed to the usual, square Ulam spiral). Here's a sketch ...
23
votes
6answers
2k views
Flip It, Flop It, Mean It
Overview
Given an image in plain PPM (P3) format as input, for each pixel p in the image, replace each of the following 4 pixels' red, green, and blue with the floored average value of the respective ...
51
votes
6answers
1k views
Paint by Numbers (using programming, not numbers)
Your task is to create a program which takes a black-and-white outlined image (example images are below) and fills it in with colour. It is up to you how you section off each region and which colour ...
7
votes
1answer
446 views
Make the pattern from composition notebooks [closed]
This challenge was xnor's idea, taken from Digital Trauma's challenge donation thread.
Your challenge is to write a program that, as xnor put it, "procedurally generate[s] the splotchy black-and-...
25
votes
6answers
587 views
Draw the Pentaflake
First of all ... I would like to wish everyone a Merry Christmas (sorry if I am a day late for your timezone).
To celebrate the occasion, we are going to draw a snowflake. Because the year is 2015 ...
15
votes
0answers
505 views
…And Mexico will Pay for It!
Donald Trump is very impressed with the work of the people on this site. He saw how amazing of a job you did helping Ben Carson, so he even hired you to build his wall. He thinks you're terrific. Now ...
9
votes
3answers
513 views
Draw a Christmas Star / Stellated Dodecahedron
Paper stars are a big thing in my family at christmas, so I thought a virtual one would be cool.
Below is an image of a regular dodecahedron (from https://en.wikipedia.org/wiki/Dodecahedron, ...
-2
votes
1answer
180 views
Creating a colour chart in PHP will all colours [duplicate]
Now, before we begin, this has already been done here. But!, there are no PHP answers.
With that in mind, my CodeGolf is thus: create a program to show all the colours in the html CSS spectrum using ...
77
votes
2answers
1k views
Sprocket Science: Animating a Chain Drive System
The goal of this challenge is to produce an animation of a chain drive system, comprised of a set of sprocket gears connected together by a chain.
General Requirements
Your program will be given a ...
14
votes
18answers
1k views
Make the PPCG Logo
Come November 1, Programming Puzzles and Code Golf will graduate, so in the next 11 months, we'll want to save some memories from when we were ungraduated.
Write a program that produces the PPCG logo,...
19
votes
1answer
489 views
Packing Circles
Take a look at this image. Specifically, at how the holes on the ends are arranged.
(Image source)
Notice how the pipes in this image are packed in a hexagonal pattern. It is known that in 2D, a ...
