Initial project import

tools/v/examples/fireworks/fireworks.v

@@ -0,0 +1,107 @@
+import objects
+import gg
+import rand
+
+struct App {
+mut:
+	gg      &gg.Context       = unsafe { nil }
+	ui      &objects.UIParams = unsafe { nil }
+	rockets []objects.Rocket
+	frames  [][]objects.Rocket
+	// i thought about using a fixed fifo queue for the frames but the array
+	// seemed to work fine, if you'd like a challenge try implementing it with the queue :)
+	draw_flag bool = true
+}
+
+fn on_frame(mut app App) {
+	if !app.draw_flag {
+		return
+	}
+	app.gg.begin()
+
+	// drawing previous frames
+	for mut frame in app.frames {
+		for mut rocket in frame {
+			if !rocket.exploded {
+				rocket.color.a = u8(f32_max(rocket.color.a - 8, 0))
+				rocket.draw(mut app.gg)
+			}
+		}
+	}
+
+	// chance of firing new rocket
+	if rand.intn(30) or { 0 } == 0 {
+		app.rockets << objects.new_rocket()
+	}
+	// simulating rockets
+	app.rockets = app.rockets.filter(!it.dead)
+
+	for mut rocket in app.rockets {
+		rocket.tick(mut app.gg)
+	}
+
+	// adding frame
+	mut frame := app.rockets.clone()
+
+	for mut rocket in frame {
+		rocket.particles = []
+	}
+
+	app.frames << frame
+
+	// trimming out frames
+	if app.frames.len > 30 {
+		app.frames.delete(0)
+	}
+
+	app.gg.end()
+}
+
+fn on_event(e &gg.Event, mut app App) {
+	match e.typ {
+		.resized, .resumed {
+			app.resize()
+		}
+		.iconified {
+			app.draw_flag = false
+		}
+		.restored {
+			app.draw_flag = true
+			app.resize()
+		}
+		else {
+			// println("Type ${e.typ}")
+		}
+	}
+}
+
+fn (mut app App) resize() {
+	size := gg.window_size()
+	// avoid calls when minimized
+	if size.width < 2 && size.height < 2 {
+		return
+	}
+	mut s := gg.dpi_scale()
+
+	if s == 0.0 {
+		s = 1.0
+	}
+	app.ui.dpi_scale = s
+	app.ui.width = size.width
+	app.ui.height = size.height
+}
+
+fn main() {
+	mut app := &App{}
+	app.ui = objects.get_params()
+	app.gg = gg.new_context(
+		width:        app.ui.width
+		height:       app.ui.height
+		window_title: 'Fireworks!'
+		bg_color:     gg.black
+		user_data:    app
+		frame_fn:     on_frame
+		event_fn:     on_event
+	)
+	app.gg.run()
+}