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v/examples/hot_code_reloading/bounce.v

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// Build this example with
// v -live bounce.v
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module main
import gx
import gl
import gg
import glfw
import time
struct Game {
mut:
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gg *gg.GG
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x int
y int
dy int
dx int
height int
width int
main_wnd *glfw.Window
draw_fn voidptr
}
fn main() {
glfw.init()
width := 600
height := 300
mut game := &Game{
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gg: 0
dx: 2
dy: 2
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height: height
width: width
}
mut window := glfw.create_window(glfw.WinCfg {
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width: width
height: height
borderless: false
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title: 'Hot code reloading demo'
ptr: game
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always_on_top: true
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})
//window.onkeydown(key_down)
game.main_wnd = window
window.make_context_current()
gg.init()
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game.gg = gg.new_context(gg.Cfg {
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width: width
height: height
font_size: 20
use_ortho: true
})
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println('Starting the game loop...')
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go game.run()
for {
gl.clear()
gl.clear_color(255, 255, 255, 255)
game.draw()
window.swap_buffers()
glfw.wait_events()
}
}
const (
W = 50
)
[live]
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fn (game &Game) draw() {
game.gg.draw_rect(game.x, game.y, W, W, gx.rgb(255, 0, 0))
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}
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fn (game mut Game) run() {
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for {
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game.x += game.dx
game.y += game.dy
if game.y >= game.height - W || game.y <= 0 {
game.dy = - game.dy
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}
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if game.x >= game.width - W || game.x <= 0 {
game.dx = - game.dx
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}
// Refresh
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time.sleep_ms(17)
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glfw.post_empty_event()
}
}