import os import objects import gg import gx import rand struct App { mut: gg &gg.Context = 0 ui &objects.UIParams = 0 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 = byte(f32_max(rocket.color.a - 8, 0)) rocket.draw(mut app.gg) } } } // chance of firing new rocket if rand.intn(30) == 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 } [console] // is needed for easier diagnostics on windows fn main() { mut font_path := os.resource_abs_path(os.join_path('../assets/fonts/', 'RobotoMono-Regular.ttf')) $if android { font_path = 'fonts/RobotoMono-Regular.ttf' } 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: gx.black use_ortho: true user_data: app frame_fn: on_frame event_fn: on_event font_path: font_path ) app.gg.run() }