v/examples/hot_reload/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
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main_wnd &glfw.Window
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draw_fn voidptr
}
fn main() {
glfw.init_glfw()
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width := 600
height := 300
mut game := &Game{
gg: 0
dx: 2
dy: 2
height: height
width: width
main_wnd: 0
draw_fn: 0
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}
window := glfw.create_window(glfw.WinCfg {
width: width
height: height
borderless: false
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title: 'Hot code reloading demo'
ptr: game
always_on_top: true
})
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//window.onkeydown(key_down)
game.main_wnd = window
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window.make_context_current()
gg.init_gg()
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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
window_user_ptr: 0
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})
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println('Starting the game loop...')
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go game.run()
for {
if window.should_close() {
break
}
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gl.clear()
gl.clear_color(255, 255, 255, 255)
game.draw()
window.swap_buffers()
glfw.wait_events()
}
}
const (
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width = 50
red = gx.rgb(255,0,0)
green = gx.rgb(0,255,0)
blue = gx.rgb(0,0,255)
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)
// Try uncommenting or changing the lines inside the live functions.
// Guess what will happen:
[live]
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fn (game &Game) draw() {
game.gg.draw_rect(game.x, game.y, width, width, blue)
// game.gg.draw_rect(game.x, game.y, width, width, gx.rgb(128,10,255))
}
[live]
fn (game mut Game) update_model() {
// game.x = 0 game.y = 0 game.dx = 1 game.dy = 1
// game.dx = 3 game.dy = 3
speed := 2
game.x += speed * game.dx
game.y += speed * game.dy
if game.y >= game.height - width || game.y <= 0 {
game.dy = - game.dy
}
if game.x >= game.width - width || game.x <= 0 {
game.dx = - game.dx
}
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}
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fn (game mut Game) run() {
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for {
game.update_model()
glfw.post_empty_event() // Refresh
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time.sleep_ms(17)
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}
}