import gg
import gx

struct App {
mut:
	gg       &gg.Context = 0
	rotation f32 = f32(0)
}

[console]
fn main() {
	mut app := &App{}

	app.gg = gg.new_context(
		window_title: 'Simple Polygons'
		width: 500
		height: 500
		bg_color: gx.black
		event_fn: event
		frame_fn: render
		user_data: app
	)

	app.gg.run()
}

fn render(app &App) {
	app.gg.begin()

	color := gx.Color{
		r: 175
		g: 0
		b: 0
		a: 200
	}
	mut shape := 3
	for i := 1; i < 5; i++ {
		for j := 1; j < 5; j++ {
			app.gg.draw_polygon_filled(100 * j, 100 * i, 30, shape, app.rotation, color)
			shape++
		}
	}

	app.gg.end()
}

fn event(e &gg.Event, mut app App) {
	match e.typ {
		.key_down {
			match e.key_code {
				.right { app.rotation++ }
				.left { app.rotation-- }
				.escape { app.gg.quit() }
				else {}
			}
			print('rotation: ')
			println(app.rotation)
		}
		else {}
	}
}