added automatic series approximation terms calculation

Author: jackyarndley

output.png

@@ -53,15 +53,15 @@ fn main() {
     println!("Zoom: {}", zoom);
 
     let mut renderer = FractalRenderer::new(
-        5000,
-        5000,
+        1000,
+        1000,
         zoom,
         iterations.parse::<usize>().unwrap(),
         center_re,
         center_im,
         0.01,
         false,
-        32
+        0
     );
 
     let time = Instant::now();

src/bin/main.rs

@@ -2,7 +2,7 @@ use crate::util::{image::Image, ComplexFixed, ComplexArbitrary, PixelData, compl
 use crate::math::{SeriesApproximation, Perturbation};
 
 use std::time::Instant;
-use std::cmp::max;
+use std::cmp::{min, max};
 use std::f64::consts::LOG2_10;
 
 use rand::seq::SliceRandom;
@@ -46,14 +46,21 @@ impl FractalRenderer {
             precision as u32,
             ComplexArbitrary::parse("(".to_owned() + center_real + "," + center_imag + ")").expect("Location is not valid!"));
 
+        let auto_approximation = if approximation_order == 0 {
+            let auto = (((image_width * image_height) as f64).log(1e6).powi(2) * 21.0f64) as usize;
+            min(max(auto, 3), 64)
+        } else {
+            approximation_order
+        };
+
         FractalRenderer {
             image_width,
             image_height,
             aspect,
             zoom,
             center_location,
             maximum_iteration,
-            approximation_order,
+            approximation_order: auto_approximation,
             glitch_tolerance,
             image: Image::new(image_width, image_height, display_glitches)
         }