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v/examples/quadtree_demo/quadtree_demo.v

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module main
import datatypes
import gg
import gx
import os
import time
import math
import rand
const (
win_width = 1340
win_height = 640
timer_period = 40 * time.millisecond // defaulted at 25 fps
font_small = gx.TextCfg{
color: gx.black
size: 20
}
font_large = gx.TextCfg{
color: gx.black
size: 40
}
)
struct App {
mut:
gg &gg.Context
qt datatypes.Quadtree
players []datatypes.AABB
particles []Particle
retrieveds []datatypes.AABB
nodes []datatypes.Quadtree
width f64 = 1340
height f64 = 640
}
struct Particle {
mut:
pmt datatypes.AABB
speed f64
angle f64
}
fn (mut p Particle) update() {
p.pmt.x += p.speed * math.cos(p.angle * math.pi / 180)
p.pmt.y += p.speed * math.sin(p.angle * math.pi / 180)
if p.pmt.x < 0 {
p.pmt.x = 0
p.speed = -p.speed
p.angle = -p.angle
}
if p.pmt.x > 1340 {
p.pmt.x = 1340
p.speed = -p.speed
p.angle = -p.angle
}
if p.pmt.y < 0 {
p.pmt.y = 0
p.speed = -p.speed
p.angle = 180 - p.angle
}
if p.pmt.y > 640 {
p.pmt.y = 640
p.speed = -p.speed
p.angle = 180 - p.angle
}
}
fn (mut app App) start() {
app.players << datatypes.AABB{1200 * rand.f64(), 500 * rand.f64(), 20, 20}
app.insert_particles()
for mut particle in app.particles {
particle.speed = 10 * rand.f64()
particle.angle = 200 * rand.f64()
}
app.nodes << app.qt.get_nodes()
}
fn (mut app App) update() {
app.qt.clear()
app.nodes = []
for mut particle in app.particles {
particle.update()
app.qt.insert(particle.pmt)
}
app.find_particles()
app.nodes << app.qt.get_nodes()
}
fn (mut app App) insert_particles() {
mut grid := 10.0
mut gridh := app.qt.perimeter.width / grid
mut gridv := app.qt.perimeter.height / grid
num_particles := 100
for _ in 0 .. num_particles {
mut x := rand_minmax(0, gridh) * grid
mut y := rand_minmax(0, gridv) * grid
mut random_particle := datatypes.AABB{
x: x
y: y
width: rand_minmax(1, 4) * grid
height: rand_minmax(1, 4) * grid
}
app.particles << Particle{random_particle, 0.0, 0.0}
}
}
fn (mut app App) find_particles() {
app.retrieveds = []
app.retrieveds << app.qt.retrieve(app.players[0])
}
fn main() {
mut app := &App{
gg: 0
}
app.gg = gg.new_context(
bg_color: gx.white
width: win_width
height: win_height
use_ortho: true
create_window: true
window_title: 'Quadtree Demo'
frame_fn: frame
event_fn: on_event
user_data: app
font_path: os.resource_abs_path('../assets/fonts/RobotoMono-Regular.ttf')
)
app.qt = app.qt.create(0, 0, 1340, 640, 8, 4, 0)
app.start()
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spawn app.run()
app.gg.run()
}
fn (mut app App) on_mouse_move(mouse_x f32, mouse_y f32) {
for mut player in app.players {
player.x = (mouse_x / gg.window_size_real_pixels().width) * 1340
player.y = (mouse_y / gg.window_size_real_pixels().height) * 640
}
}
fn on_event(mut e gg.Event, mut app App) {
match e.typ {
.mouse_move { app.on_mouse_move(e.mouse_x, e.mouse_y) }
else {}
}
}
fn (mut app App) run() {
for {
app.update()
time.sleep(timer_period)
}
}
fn frame(app &App) {
app.gg.begin()
app.draw()
app.gg.end()
}
fn (app &App) display() {
for player in app.players {
app.gg.draw_rect_filled(f32(player.x), f32(player.y), f32(player.width), f32(player.height),
gx.black)
}
for particle in app.particles {
app.gg.draw_rect_empty(f32(particle.pmt.x), f32(particle.pmt.y), f32(particle.pmt.width),
f32(particle.pmt.height), gx.blue)
}
for node in app.nodes {
app.gg.draw_rect_empty(f32(node.perimeter.x), f32(node.perimeter.y), f32(node.perimeter.width),
f32(node.perimeter.height), gx.red)
}
for retrieved in app.retrieveds {
app.gg.draw_rect_filled(f32(retrieved.x + 1), f32(retrieved.y + 1), f32(retrieved.width - 2),
f32(retrieved.height - 2), gx.green)
}
app.gg.draw_text(1200, 25, 'Nodes: ${app.nodes.len}', font_small)
app.gg.draw_text(1200, 50, 'Particles: ${app.particles.len}', font_small)
}
fn (app &App) draw() {
app.display()
}
fn rand_minmax(min f64, max f64) f64 {
mut val := min + (rand.f64() * (max - min))
return val
}