Roygbiv Code

We are going to write an encoding function that makes an image like a bar code, but using colored rectangles instead of bars.

Encoded phone number

Each digit will map to a 30x70 rectangle. The colors of the digits 0 through 9 will be the usual rainbow: red, orange, yellow, green, blue, indigo, violet, and then three randomly chosen colors:

 (define rc7 (make-color 25 134 240))
 (define rc8 (make-color 121 143 37))
 (define rc9 (make-color 220 194 21))

For example, an input of 7510 to encode gives the code below.

(encode 7510)

Write a function to create a color-based bar code.

Answered questions

  • You should ignore leading zeros.

Intermediate

Got the encoder working? Write a decoder that takes in an image and produces an integer.

Last modified February 22, 2024: Edits. Updates for new Hugo and Docsy versions. (00256f7)