Koch curve: Difference between revisions

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// svg = "0.8.0"

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use svg::node::element::Rectangle;

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use svg::node::element::Path;

use svg::node::element::path::Data;

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use svg::node::element::Path;

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use svg::node::element::Rectangle;

const SQRT3_2 : f64 = 0.86602540378444;

const SQRT3_2: f64 = 0.86602540378444;

fn koch_curve(mut data: Data, x0 : f64, y0 : f64,

fn koch_curve(mut data: Data, x0: f64, y0: f64, x1: f64, y1: f64, order: usize) -> Data {

x1 : f64, y1 : f64, order : usize) -> Data {

if order == 0 {

data = data.line_to((x1, y1));

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let dx = x1 - x0;

let dy = y1 - y0;

let x2 = x0 + dx/3.0;

let x2 = x0 + dx / 3.0;

let y2 = y0 + dy/3.0;

let y2 = y0 + dy / 3.0;

let x3 = x0 + dx/2.0 - dy * SQRT3_2/3.0;

let x3 = x0 + dx / 2.0 - dy * SQRT3_2 / 3.0;

let y3 = y0 + dy/2.0 + dx * SQRT3_2/3.0;

let y3 = y0 + dy / 2.0 + dx * SQRT3_2 / 3.0;

let x4 = x0 + 2.0 * dx/3.0;

let x4 = x0 + 2.0 * dx / 3.0;

let y4 = y0 + 2.0 * dy/3.0;

let y4 = y0 + 2.0 * dy / 3.0;

data = koch_curve(data, x0, y0, x2, y2, order - 1);

data = koch_curve(data, x2, y2, x3, y3, order - 1);

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}

fn write_koch_snowflake(file : &str, size : usize,

fn write_koch_snowflake(file: &str, size: usize, order: usize) -> std::io::Result<()> {

order : usize) -> std::io::Result<()> {

let length = (size as f64) * SQRT3_2 * 0.95;

let x0 = ((size as f64) - length)/2.0;

let x0 = ((size as f64) - length) / 2.0;

let y0 = (size as f64)/2.0 - length * SQRT3_2/3.0;

let y0 = (size as f64) / 2.0 - length * SQRT3_2 / 3.0;

let x1 = x0 + length/2.0;

let x1 = x0 + length / 2.0;

let y1 = y0 + length * SQRT3_2;

let x2 = x0 + length;