How to resolve the algorithm Colour pinstripe/Display step by step in the Go programming language
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:
-
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.
-
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.
-
main
Function:- In the
main
function, a graphics context is created and passed to thepinstripe
function to draw the pattern. - The resulting image is saved as a PNG file.
- In the
Usage:
To use this program:
- Install the
gg
library. - Run the program using
go run main.go
. - 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")
}
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