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

The provided source code is written in Go and uses the github.com/fogleman/gg library to create a "pinstripe" pattern image. Let's go through the code step by step:

1. Package Declaration:

   package main

   This line declares the main package.

2. Palette:

   var palette = [2]string{
      "FFFFFF", // white
      "000000", // black
   }

   This line defines a color palette with two colors: white and black. The colors are represented as hexadecimal color codes.

3. pinstripe Function:

   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%2])
              y := h * (b - 1)
              dc.DrawRectangle(float64(x), float64(y), float64(b), float64(h))
              dc.Fill()
          }
      }
   }

   This function creates the pinstripe pattern. Here's what it does:

   • It gets the width (w) and height (h) of the drawing context (dc).
   • It iterates through four blocks (represented by the b loop).
   • For each block, it loops through the width of the image, creating stripes of alternating colors. The color index (ci) is incremented to switch between the two colors in the palette.
   • It sets the drawing color using SetHexColor, draws a rectangle, and fills it.

4. main Function:

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

   • The main function is the entry point of the program.
   • It creates a drawing context (dc) with a width of 900 and a height of 600.
   • It calls the pinstripe function to draw the pattern on the context.
   • Finally, it saves the image as a PNG file named "w_pinstripe.png".

In summary, this program creates a "pinstripe" pattern image where alternating stripes of white and black are drawn horizontally. The pattern is saved as a PNG file.

package main

import "github.com/fogleman/gg"

var palette = [2]string{
    "FFFFFF", // white
    "000000", // black    
}

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%2])
            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("w_pinstripe.png")
}