92 lines
2.2 KiB
V
92 lines
2.2 KiB
V
// Copyright(C) 2019 Lars Pontoppidan. All rights reserved.
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// Use of this source code is governed by an MIT license file distributed with this software package.
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module main
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// Example of how to send a value through a channel from a worker thread to the main/rendering thread.
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// This can be useful to do long running computations while keeping your framerate high (60 fps in this example).
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import gg
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import gx
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import math
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import time
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const (
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win_width = 600
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win_height = 700
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bg_color = gx.white
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count_color = gx.black
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)
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struct App {
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mut:
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gg &gg.Context
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ch chan i64
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counter i64
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}
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fn main() {
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mut app := &App{
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gg: 0
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}
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app.gg = gg.new_context(
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width: win_width
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height: win_height
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use_ortho: true // This is needed for 2D drawing
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create_window: true
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window_title: 'Counter'
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user_data: app
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bg_color: bg_color
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frame_fn: frame
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init_fn: init
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font_path: gg.system_font_path()
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)
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app.gg.run()
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}
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fn init(mut app App) {
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// Spawn a new worker thread.
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go worker(mut app)
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}
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// worker simulates a workload. This should be run in a separate thread.
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fn worker(mut app App) {
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stopwatch := time.new_stopwatch({})
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mut elapsed := stopwatch.elapsed()
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// Do heavy operations here - like invoking a path finding algorithm, load an image or similar.
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for {
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now := stopwatch.elapsed()
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// When done - send the result through a channel to the main/rendering thread.
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app.ch <- (now - elapsed)
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elapsed = now
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time.sleep(1 * time.second)
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}
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}
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fn frame(mut app App) {
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app.gg.begin()
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size := gg.window_size()
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mut scale_factor := math.round(f32(size.width) / win_width)
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if scale_factor <= 0 {
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scale_factor = 1
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}
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text_cfg := gx.TextCfg{
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size: 64 * int(scale_factor)
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}
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// Try a pop from the channel
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mut count := i64(0)
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if app.ch.try_pop(mut count) == .success {
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// A value was assigned - increase the counter
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app.counter += i64(f64(count) / time.second)
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}
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label := '$app.counter'
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label_width := (f64(label.len * text_cfg.size) / 4.0)
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label_height := (f64(1 * text_cfg.size) / 2.0)
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mut x := f32(size.width) * 0.5 - label_width
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mut y := f32(size.height) * 0.5 - label_height
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app.gg.draw_text(int(x), int(y), label, text_cfg)
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app.gg.end()
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}
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