100 lines
1.7 KiB
V
100 lines
1.7 KiB
V
// Copyright(C) 2019 Lars Pontoppidan. All rights reserved.
|
|
// Use of this source code is governed by an MIT license file distributed with this software package
|
|
module particle
|
|
|
|
import vec2
|
|
import rand
|
|
import sokol.sgl
|
|
|
|
pub struct SystemConfig {
|
|
pool int
|
|
}
|
|
|
|
pub struct System {
|
|
width int
|
|
height int
|
|
mut:
|
|
pool []&Particle
|
|
bin []&Particle
|
|
}
|
|
|
|
pub fn (mut s System) init(sc SystemConfig) {
|
|
for i := 0; i < sc.pool; i++ {
|
|
p := new(vec2.Vec2{f32(s.width) * 0.5, f32(s.height) * 0.5})
|
|
s.pool << p
|
|
}
|
|
}
|
|
|
|
pub fn (mut s System) update(dt f64) {
|
|
mut p := &Particle(0)
|
|
for i := 0; i < s.pool.len; i++ {
|
|
p = s.pool[i]
|
|
p.update(dt)
|
|
if p.is_dead() {
|
|
s.bin << p
|
|
s.pool.delete(i)
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn (s System) draw() {
|
|
sgl.begin_quads()
|
|
for p in s.pool {
|
|
p.draw()
|
|
}
|
|
sgl.end()
|
|
}
|
|
|
|
pub fn (mut s System) reset() {
|
|
for p in s.pool {
|
|
p.reset()
|
|
p.life_time = 0
|
|
}
|
|
for p_ in s.bin {
|
|
p_.reset()
|
|
p_.life_time = 0
|
|
}
|
|
}
|
|
|
|
pub fn (mut s System) explode(x, y f32) {
|
|
mut reserve := 500
|
|
center := vec2.Vec2{x, y}
|
|
mut p := &Particle(0)
|
|
for i := 0; i < s.bin.len && reserve > 0; i++ {
|
|
p = s.bin[i]
|
|
p.reset()
|
|
p.location.from(center)
|
|
p.acceleration = vec2.Vec2{rand.f32_in_range(-0.5, 0.5), rand.f32_in_range(-0.5,
|
|
0.5)}
|
|
p.velocity = vec2.Vec2{rand.f32_in_range(-0.5, 0.5), rand.f32_in_range(-0.5, 0.5)}
|
|
p.life_time = rand.f64_in_range(500, 2000)
|
|
s.pool << p
|
|
s.bin.delete(i)
|
|
reserve--
|
|
}
|
|
}
|
|
|
|
pub fn (mut s System) free() {
|
|
for p in s.pool {
|
|
if p == 0 {
|
|
print(ptr_str(p) + ' ouch')
|
|
continue
|
|
}
|
|
unsafe {
|
|
free(p)
|
|
}
|
|
}
|
|
s.pool.clear()
|
|
for p in s.bin {
|
|
if p == 0 {
|
|
print(ptr_str(p) + ' ouch')
|
|
continue
|
|
}
|
|
unsafe {
|
|
// println('Freeing from bin')
|
|
free(p)
|
|
}
|
|
}
|
|
s.bin.clear()
|
|
}
|