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v/examples/hot_reload/bounce.v
2020-05-04 12:26:39 +02:00

117 lines
2.0 KiB
V

// Build this example with
// v -live bounce.v
module main
import gx
import gl
import gg
import glfw
import time
struct Game {
mut:
gg &gg.GG
x int
y int
dy int
dx int
height int
width int
main_wnd &glfw.Window
draw_fn voidptr
}
const (
window_width = 400
window_height = 300
width = 50
red = gx.rgb(255, 0, 0)
green = gx.rgb(0, 255, 0)
blue = gx.rgb(0, 0, 255)
black = gx.rgb(0, 0, 0)
)
fn main() {
glfw.init_glfw()
mut game := &Game{
gg: 0
dx: 2
dy: 2
height: window_height
width: window_width
main_wnd: 0
draw_fn: 0
}
window := glfw.create_window(glfw.WinCfg{
width: window_width
height: window_height
borderless: false
title: 'Hot code reloading demo'
ptr: game
always_on_top: true
})
// window.onkeydown(key_down)
game.main_wnd = window
window.make_context_current()
gg.init_gg()
game.gg = gg.new_context(gg.Cfg{
width: window_width
height: window_height
font_size: 20
use_ortho: true
window_user_ptr: 0
})
println('Starting the game loop...')
go game.run()
for {
if window.should_close() {
break
}
gl.clear()
gl.clear_color(255, 255, 255, 255)
game.draw()
window.swap_buffers()
glfw.wait_events()
}
}
// Try uncommenting or changing the lines inside the live functions.
// Guess what will happen:
[live]
fn (game &Game) draw() {
game.gg.draw_rect(game.x, game.y, width, width, blue)
game.gg.draw_rect(window_width - width - game.x + 10, 200 - game.y + width, width, width, gx.rgb(228, 10, 55))
game.gg.draw_rect(game.x - 25, 250 - game.y, width, width, gx.rgb(28, 240, 55))
}
[live]
fn (mut game Game) update_model() {
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
}
}
fn (mut game Game) run() {
for {
game.update_model()
glfw.post_empty_event() // Refresh
time.sleep_ms(17) // 60fps
}
}