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camera.rs
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use crate::input::Input;
use sdl2::{pixels::Color, rect::Rect, render::Canvas, ttf, video::Window};
use std::{sync::mpsc::channel, time::Duration};
use threadpool::ThreadPool;
const SPEED: f64 = 0.2;
const THRESHOLD: u32 = 2;
pub const BASE_DEPTH: u32 = 40;
#[derive(Copy, Clone)]
pub struct Camera {
x: f64,
y: f64,
screen_width: u32,
screen_height: u32,
max_depth: u32,
depth_inc: u32,
zoom: f64,
}
struct ColoredRect {
rect: Rect,
color: Color,
}
impl Camera {
pub fn new(screen_width: u32, screen_height: u32, max_depth: u32) -> Self {
Self {
x: 0.0,
y: 0.0,
screen_width,
screen_height,
max_depth,
depth_inc: 0,
zoom: 1.0,
}
}
pub fn update_with_delta_time(&mut self, current_input: &Input, delta_time: Duration) {
if current_input.up {
self.y -= SPEED * delta_time.as_secs_f64() / self.zoom
}
if current_input.left {
self.x -= SPEED * delta_time.as_secs_f64() / self.zoom
}
if current_input.down {
self.y += SPEED * delta_time.as_secs_f64() / self.zoom
}
if current_input.right {
self.x += SPEED * delta_time.as_secs_f64() / self.zoom
}
if current_input.zoom_in {
self.zoom += SPEED * delta_time.as_secs_f64() * self.zoom;
self.depth_inc += 1;
}
if current_input.zoom_out && self.depth_inc > 0 {
self.zoom -= SPEED * delta_time.as_secs_f64() * self.zoom;
self.depth_inc -= 1;
}
self.max_depth = BASE_DEPTH + (self.depth_inc / THRESHOLD);
}
fn screen_origin_in_world_coordinate(&self) -> (f64, f64) {
(self.x - 1.0 / self.zoom, self.y - 1.0 / self.zoom)
}
fn convert_screen_coordinate_to_world_coordinate(
&self,
screen_x: u32,
screen_y: u32,
) -> (f64, f64) {
let (origin_x, origin_y) = self.screen_origin_in_world_coordinate();
let mut tup = (
2.0 * (screen_x as f64) / (self.zoom * ((self.screen_width - 1) as f64)) + origin_x,
2.0 * (screen_y as f64) / (self.zoom * ((self.screen_height - 1) as f64)) + origin_y,
);
if self.screen_width > self.screen_height {
let aspect_ratio = self.screen_height as f64 / self.screen_width as f64;
tup = (tup.0, tup.1 * aspect_ratio);
}
tup
}
fn get_color_of_world_coordinate(&self, world_coordinate: (f64, f64)) -> Color {
let (x0, y0) = world_coordinate;
let mut x2 = 0.0;
let mut y2 = 0.0;
let mut x = 0.0;
let mut y = 0.0;
let mut iteration = 0;
while x2 + y2 <= 4.0 && iteration < self.max_depth {
y = 2.0 * x * y + y0;
x = x2 - y2 + x0;
x2 = x * x;
y2 = y * y;
iteration += 1;
}
if iteration == self.max_depth {
Color::BLACK
} else {
let abs = x2 + y2;
let nsmooth = (iteration + 1) as f64 - abs.ln().ln() / (2.0_f64).ln();
Color::RGB(
((3.0 * nsmooth + 4.0) as u32 % 255).try_into().unwrap(),
((nsmooth + 2.0) as u32 % 255).try_into().unwrap(),
((nsmooth * nsmooth + 5.0 * nsmooth + 20.0) as u32 % 255)
.try_into()
.unwrap(),
)
}
}
pub fn render_mandelbrot(&self, canvas: &mut Canvas<Window>) {
self.render_mandelbrot_recursive(0, 0, self.screen_width, self.screen_height)
.iter()
.for_each(|colored_rect| {
canvas.set_draw_color(colored_rect.color);
canvas.fill_rect(colored_rect.rect).unwrap();
});
let ttf2 = ttf::init().unwrap();
let font = ttf2.load_font("./ComicSansMS3.ttf", 20).unwrap();
let x = font
.render(format!("ZOOM: {:.2}", self.zoom).as_str())
.solid(Color::WHITE)
.unwrap();
let z = canvas.texture_creator();
let y = x.as_texture(&z).unwrap();
canvas
.copy(&y, None, Some(Rect::new(10, -10, 200, 80)))
.unwrap();
}
fn render_mandelbrot_recursive(&self, x: u32, y: u32, w: u32, h: u32) -> Vec<ColoredRect> {
let origin = self.convert_screen_coordinate_to_world_coordinate(x, y);
let rect_origin_color: Color = self.get_color_of_world_coordinate(origin);
if w <= 1 && h <= 1 {
return vec![ColoredRect {
rect: Rect::new(x as i32, y as i32, 1, 1),
color: rect_origin_color,
}];
}
for i in x..(x + w) {
let coordinate1 = self.convert_screen_coordinate_to_world_coordinate(i, y);
let coordinate2 = self.convert_screen_coordinate_to_world_coordinate(i, y + h);
let color1 = self.get_color_of_world_coordinate(coordinate1);
let color2 = self.get_color_of_world_coordinate(coordinate2);
if color1 != color2 || color1 != rect_origin_color {
let mut result = Vec::new();
if w == self.screen_width && h == self.screen_height {
//topmost func call
let n_workers = 4;
let pool = ThreadPool::new(n_workers);
let (tx, rx) = channel();
let tx1 = tx.clone();
let cam = *self;
pool.execute(move || {
tx1.send(cam.render_mandelbrot_recursive(
x,
y,
w / 2 + w % 2,
h / 2 + h % 2,
))
.unwrap();
});
let tx2 = tx.clone();
let cam = *self;
pool.execute(move || {
tx2.send(cam.render_mandelbrot_recursive(
x + w / 2 + w % 2,
y,
w / 2,
h / 2 + h % 2,
))
.unwrap();
});
let cam = *self;
pool.execute(move || {
tx.send(cam.render_mandelbrot_recursive(
x,
y + h / 2 + h % 2,
w / 2 + w % 2,
h / 2,
))
.unwrap();
});
result.append(&mut self.render_mandelbrot_recursive(
x + w / 2 + w % 2,
y + h / 2 + h % 2,
w / 2,
h / 2,
));
rx.iter().for_each(|mut r| {
result.append(&mut r);
});
} else {
result.append(&mut self.render_mandelbrot_recursive(
x,
y,
w / 2 + w % 2,
h / 2 + h % 2,
));
result.append(&mut self.render_mandelbrot_recursive(
x + w / 2 + w % 2,
y,
w / 2,
h / 2 + h % 2,
));
result.append(&mut self.render_mandelbrot_recursive(
x,
y + h / 2 + h % 2,
w / 2 + w % 2,
h / 2,
));
result.append(&mut self.render_mandelbrot_recursive(
x + w / 2 + w % 2,
y + h / 2 + h % 2,
w / 2,
h / 2,
));
}
return result;
}
}
for j in y..(y + h) {
let coordinate1 = self.convert_screen_coordinate_to_world_coordinate(x, j);
let coordinate2 = self.convert_screen_coordinate_to_world_coordinate(x + w, j);
let color1 = self.get_color_of_world_coordinate(coordinate1);
let color2 = self.get_color_of_world_coordinate(coordinate2);
if color1 != color2 || color1 != rect_origin_color {
let mut result = Vec::new();
if w == self.screen_width && h == self.screen_height {
//topmost func call
let n_workers = 4;
let pool = ThreadPool::new(n_workers);
let (tx, rx) = channel();
let tx1 = tx.clone();
let cam = *self;
pool.execute(move || {
tx1.send(cam.render_mandelbrot_recursive(
x,
y,
w / 2 + w % 2,
h / 2 + h % 2,
))
.unwrap();
});
let tx2 = tx.clone();
let cam = *self;
pool.execute(move || {
tx2.send(cam.render_mandelbrot_recursive(
x + w / 2 + w % 2,
y,
w / 2,
h / 2 + h % 2,
))
.unwrap();
});
let cam = *self;
pool.execute(move || {
tx.send(cam.render_mandelbrot_recursive(
x,
y + h / 2 + h % 2,
w / 2 + w % 2,
h / 2,
))
.unwrap();
});
result.append(&mut self.render_mandelbrot_recursive(
x + w / 2 + w % 2,
y + h / 2 + h % 2,
w / 2,
h / 2,
));
rx.iter().for_each(|mut r| {
result.append(&mut r);
});
} else {
result.append(&mut self.render_mandelbrot_recursive(
x,
y,
w / 2 + w % 2,
h / 2 + h % 2,
));
result.append(&mut self.render_mandelbrot_recursive(
x + w / 2 + w % 2,
y,
w / 2,
h / 2 + h % 2,
));
result.append(&mut self.render_mandelbrot_recursive(
x,
y + h / 2 + h % 2,
w / 2 + w % 2,
h / 2,
));
result.append(&mut self.render_mandelbrot_recursive(
x + w / 2 + w % 2,
y + h / 2 + h % 2,
w / 2,
h / 2,
));
}
return result;
}
}
vec![ColoredRect {
rect: Rect::new(x as i32, y as i32, w as u32, h as u32),
color: rect_origin_color,
}]
}
}