module main import gg import gx struct App { mut: gg &gg.Context = unsafe { 0 } rotation f32 = f32(0) edge int = 3 } [console] fn main() { println('rotation: left arrow key, right arrow key') println('center polygon edge: up arrow key, down arrow key') 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 edge := 3 for i := 0; i <= 5; i++ { for j := 0; j <= 5; j++ { if i == 0 || j == 0 || i == 5 || j == 5 { app.gg.draw_polygon_filled(50 + 80 * i, 50 + 80 * j, 30, edge, app.rotation, color) edge++ } } } app.gg.draw_polygon_filled(250, 250, 150, app.edge, app.rotation, color) app.gg.end() } fn event(e &gg.Event, mut app App) { match e.typ { .key_down { match e.key_code { .up { app.edge++ } .down { if app.edge > 3 { app.edge-- } } .right { app.rotation++ } .left { app.rotation-- } .escape { app.gg.quit() } else {} } } else {} } }