kristoferssolo/donut-rs
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Fix flickering

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This commit is contained in:
Kristofers Solo 2022-08-30 21:44:14 +03:00
parent 3f0e643614
commit 0d2d5548ae
1 changed files with 19 additions and 16 deletions
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35
src/main.rs
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@ -5,11 +5,11 @@ fn main() {
let mut a: f32 = 0.0;
let mut b: f32 = 0.0;
print!("\x1B[2J"); // clears screen
print!("\x1b[2J"); // clears screen
loop {
let mut z: [f32; SCREEN_SIZE] = [0.0; SCREEN_SIZE];
let mut screen: [char; SCREEN_SIZE] = [' '; SCREEN_SIZE];
let mut zbuffer: [f32; SCREEN_SIZE] = [0.0; SCREEN_SIZE];
let mut output: [char; SCREEN_SIZE] = [' '; SCREEN_SIZE];
for j in (0..=628).step_by(7) {
let j: f32 = 0.01 * j as f32;
@ -28,16 +28,19 @@ fn main() {
let cos_j: f32 = j.cos();
let cos_j2: f32 = cos_j + 2.0;
let mess: f32 = 1.0 / (sin_i * cos_j2 * sin_a + sin_j * cos_a + 5.0);
let z: f32 = sin_i * cos_j2 * sin_a + sin_j * cos_a + 5.0;
let ooz: f32 = 1.0 / z; // one over z
let t: f32 = sin_i * cos_j2 * cos_a - sin_j * sin_a;
// 40 is the left screen shift
let x: i32 = (40.0 + 30.0 * mess * (cos_i * cos_j2 * cos_b - t * sin_b)) as i32;
let x: i32 = (40.0 + 30.0 * ooz * (cos_i * cos_j2 * cos_b - t * sin_b)) as i32;
// 12 is the bottom screen shift
let y: i32 = (12.0 + 15.0 * mess * (cos_i * cos_j2 * sin_b + t * cos_b)) as i32;
let y: i32 = (12.0 + 15.0 * ooz * (cos_i * cos_j2 * sin_b + t * cos_b)) as i32;
let o: usize = (x + WIDTH * y) as usize;
// multiplying by 8 to bring in range 0-11 as 8*(sqrt(2))=11
// because we have 11 luminance characters
let n: i32 = (8.0
let luminance_index: i32 = (8.0
* ((sin_j * sin_a - sin_i * cos_j * cos_a) * cos_b
- sin_i * cos_j * sin_a
- sin_j * cos_a
@ -50,25 +53,25 @@ fn main() {
// i.e. when z[o] is 0 or the prev point is behind the new point
// so we change it to the point nearer to the eye/ above prev point
if 0 < y && y < HEIGHT && 0 < x && x < WIDTH && mess > z[o] {
z[o] = mess;
if n > 0 {
let m: usize = n as usize;
screen[o] = ".,-~:;=!*#$Q".chars().nth(m).unwrap();
if 0 < y && y < HEIGHT && 0 < x && x < WIDTH && ooz > zbuffer[o] {
zbuffer[o] = ooz;
if luminance_index > 0 {
let m: usize = luminance_index as usize;
output[o] = ".,-~:;=!*#$@".chars().nth(m).unwrap();
} else {
screen[o] = '.';
output[o] = '.';
}
}
}
}
// print
print!("\x1B[2J");
for index in 0..screen.len() {
print!("\x1b[H");
for index in 0..output.len() {
let i: i32 = index as i32;
if i % WIDTH == 0 {
println!();
} else {
print!("{}", screen[index]);
print!("{}", output[index]);
}
}