How to resolve the algorithm Colour pinstripe/Display step by step in the Go programming language

Published on 12 May 2024 09:40 PM
#Go

How to resolve the algorithm Colour pinstripe/Display step by step in the Go programming language

Table of Contents

Problem Statement

The task is to create 1 pixel wide coloured vertical pinstripes with a sufficient number of pinstripes to span the entire width of the graphics display.

The pinstripes should either follow the system palette sequence,   or a sequence that includes: black,   red,   green,   blue,   magenta,   cyan,   yellow,   and   white:

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Colour pinstripe/Display step by step in the Go programming language

Explanation:

This Go program generates an image with a color pinstripe pattern using the gg (Go Graphics) library. Here's how it works:

  1. Palette Definition: The program defines a palette of eight colors as hex strings. These colors range from black to white, including primary and secondary colors.

  2. pinstripe Function: This function is responsible for drawing the pinstripe pattern on a graphics context.

    • It calculates the width and height of the context and divides the height by 4.
    • Using a for loop, it iterates through four "bands" of equal height.
    • Within each band, it uses a nested for loop to draw rectangles of increasing width.
    • Each rectangle is assigned a color from the palette in a repeating cycle.
    • The rectangles are drawn filled, creating solid colored stripes.
  3. main Function:

    • In the main function, a graphics context is created and passed to the pinstripe function to draw the pattern.
    • The resulting image is saved as a PNG file.

Usage:

To use this program:

  1. Install the gg library.
  2. Run the program using go run main.go.
  3. The program will generate an image file named color_pinstripe.png.

Output:

The output image will have four bands of colored pinstripes, each band with a slightly wider set of stripes. The colors of the stripes will follow the palette defined at the beginning of the program.

Source code in the go programming language

package main

import "github.com/fogleman/gg"

var palette = [8]string{
    "000000", // black
    "FF0000", // red
    "00FF00", // green
    "0000FF", // blue
    "FF00FF", // magenta
    "00FFFF", // cyan
    "FFFF00", // yellow
    "FFFFFF", // white
}

func pinstripe(dc *gg.Context) {
    w := dc.Width()
    h := dc.Height() / 4
    for b := 1; b <= 4; b++ {
        for x, ci := 0, 0; x < w; x, ci = x+b, ci+1 {
            dc.SetHexColor(palette[ci%8])
            y := h * (b - 1)
            dc.DrawRectangle(float64(x), float64(y), float64(b), float64(h))
            dc.Fill()
        }
    }
}

func main() {
    dc := gg.NewContext(900, 600)
    pinstripe(dc)
    dc.SavePNG("color_pinstripe.png")
}


  

You may also check:How to resolve the algorithm Determine if a string is collapsible step by step in the AWK programming language
You may also check:How to resolve the algorithm Palindrome detection step by step in the Emacs Lisp programming language
You may also check:How to resolve the algorithm Ackermann function step by step in the Icon and Unicon programming language
You may also check:How to resolve the algorithm Polynomial long division step by step in the C++ programming language
You may also check:How to resolve the algorithm Leap year step by step in the Stata programming language