GENERATING DATAURI IMAGES WITH GO - main.go - 2

main.go

//main.go
package main

import (...)

func main() {
    // Seed the std random number generator
    rand.Seed(time.Now().UTC().UnixNano())

    // We will leave out creating the png image file since we
    // don't need the file

    // Set the bounds of the image basically 100px width / height
    imgRect := image.Rect(0, 0, 100, 100)
    // This creates the image in memory, and sets all pixels to a gray value.
    // And it sets the size based on the Rect we just created
    img := image.NewGray(imgRect)

    // Ok a lot going on here. Let's start creates a nil mask layer on the image
    // Tt takes the image we created in memory, and then the bounding Rect
    // Next we add a reference to a uniform color (white) over the mask
    // The image.ZP means the mask we are drawing starts at the 0,0 point
    // draw.Src reference the source mask
    draw.Draw(img, img.Bounds(), &image.Uniform{color.White}, image.ZP, draw.Src)

    // These nested loop reference the y,x coordinates.
    // 100 is reference to the image with / height in pixels
    // 10 is reference to the size of the random blocks to be generated
    for y := 0; y < 100; y += 10 {
        for x := 0; x < 100; x += 10 {
            // Here we create a color to be set as a black block
            fill := &image.Uniform{color.Black}
            // rand.Intn(10) creates a random non-negative number between 0,10
            // Then checks if it's even
            if rand.Intn(10)%2 == 0 {
                fill = &image.Uniform{color.White}
            }
            // This draw.Draw takes a new Rect that is 10px,10px and sets
            // color based on fill
            draw.Draw(img, image.Rect(x, y, x+10, y+10), fill, image.ZP, draw.Src)
        }
    }
}