module main

import gg

const points = [f32(200.0), 200.0, 200.0, 100.0, 400.0, 100.0, 400.0, 300.0]

struct App {
mut:
    gg    &gg.Context = unsafe { nil }
    steps int         = 30
}

fn main() {
    mut app := &App{}
    app.gg = gg.new_context(
        bg_color:     gg.rgb(174, 198, 255)
        width:        600
        height:       400
        window_title: 'Cubic Bézier curve'
        frame_fn:     frame
        user_data:    app
    )
    app.gg.run()
}

fn (mut app App) change(delta int) {
    app.steps += delta
    println('app.steps: ${app.steps}')
}

fn frame(mut app App) {
    app.gg.begin()
    app.gg.draw_cubic_bezier_in_steps(points, u32(app.steps), gg.blue)
    app.gg.draw_cubic_bezier_recursive(points, gg.rgba(255, 50, 50, 150))
    app.gg.end()
    if app.gg.pressed_keys[int(gg.KeyCode.down)] {
        app.change(-1)
    }
    if app.gg.pressed_keys[int(gg.KeyCode.up)] {
        app.change(1)
    }
}