module main

import gg

struct App {
mut:
    gg     &gg.Context = unsafe { nil }
    pixels []f32
}

fn main() {
    mut pixels := []f32{}
    density := 4
    for x in 30 .. 60 {
        if x % density == 0 {
            continue
        }
        for y in 30 .. 60 {
            if y % density == 0 {
                continue
            }
            pixels << f32(x + density)
            pixels << f32(y + density)
        }
    }
    mut app := &App{
        pixels: pixels
    }
    app.gg = gg.new_context(
        bg_color:     gg.rgb(174, 198, 255)
        width:        100
        height:       100
        window_title: 'Set Pixels'
        frame_fn:     frame
        user_data:    app
    )
    app.gg.run()
}

fn frame(mut app App) {
    app.gg.begin()

    // Draw a blue pixel near each corner. (Find your magnifying glass)
    app.gg.draw_pixel(2, 2, gg.blue)
    app.gg.draw_pixel(app.gg.width - 2, 2, gg.blue)
    app.gg.draw_pixel(app.gg.width - 2, app.gg.height - 2, gg.blue)
    app.gg.draw_pixel(2, app.gg.height - 2, gg.blue)

    // Draw pixels in a grid-like pattern.
    app.gg.draw_pixels(app.pixels, gg.red)
    app.gg.end()
}