From 4b1c0785a145b35affaf6ec4d6e35363e8fce383 Mon Sep 17 00:00:00 2001
From: Tom Barrett <tom@tombarrett.xyz>
Date: Mon, 27 Jul 2020 13:09:36 +0200
Subject: spider web

---
 src/main.rs | 121 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 120 insertions(+), 1 deletion(-)

(limited to 'src/main.rs')

diff --git a/src/main.rs b/src/main.rs
index e7a11a9..20b9c9c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,122 @@
+use std::thread;
+use std::time::Duration;
+
+extern crate rand;
+use rand::seq::SliceRandom;
+use rand::Rng;
+
+extern crate sdl2;
+use sdl2::event::Event;
+use sdl2::gfx::primitives::DrawRenderer;
+use sdl2::pixels::Color;
+
+fn find_origin() -> (i16, i16) {
+    let mut rng = rand::thread_rng();
+    (rng.gen_range(100, 400), rng.gen_range(100, 400))
+}
+
+struct Line {
+    x1: i16,
+    y1: i16,
+    x2: i16,
+    y2: i16,
+}
+
+struct Pixel {
+    x: i16,
+    y: i16,
+}
+
 fn main() {
-    println!("Hello, world!");
+    let context = sdl2::init().unwrap();
+    let video = context.video().unwrap();
+    let (height, width) = (500, 500);
+    let window = video.window("web", height, width).opengl().build().unwrap();
+    let mut canvas = window.into_canvas().build().unwrap();
+    let mut events = context.event_pump().unwrap();
+
+    canvas.set_draw_color(Color::RGB(0, 0, 0));
+    canvas.clear();
+    canvas.present();
+
+    let (x, y) = find_origin();
+    let delay = 50;
+    let mut lines = Vec::new();
+    for i in (0..(height as i16 + 1)).step_by(50) {
+        lines.push(Line {
+            x1: i,
+            y1: 0,
+            x2: x,
+            y2: y,
+        });
+        lines.push(Line {
+            x1: i,
+            y1: height as i16,
+            x2: x,
+            y2: y,
+        });
+        lines.push(Line {
+            x1: 0,
+            y1: i,
+            x2: x,
+            y2: y,
+        });
+        lines.push(Line {
+            x1: width as i16,
+            y1: i,
+            x2: x,
+            y2: y,
+        });
+    }
+
+    let mut rng = rand::thread_rng();
+    lines.shuffle(&mut rng);
+
+    let a = rng.gen_range(-10.0, 10.0);
+    let b = rng.gen_range(-10.0, 10.0);
+
+    let mut pixels = Vec::new();
+    for i in (1000..200000).step_by(10) {
+        let i = i as f64 * 0.001;
+        let x = (a + b * i) * i.cos() + x as f64;
+        let y = (a + b * i) * i.sin() + y as f64;
+        pixels.push(Pixel {
+            x: x as i16,
+            y: y as i16,
+        });
+    }
+
+    let mut i = 0;
+    let mut run = true;
+    while run {
+        for event in events.poll_iter() {
+            if let Event::Quit { .. } = event {
+                run = false
+            };
+        }
+
+        if i < lines.len() {
+            let line = &lines[i];
+            canvas
+                .line(
+                    line.x1,
+                    line.y1,
+                    line.x2,
+                    line.y2,
+                    Color::RGB(255, 255, 255),
+                )
+                .unwrap();
+            canvas.present();
+            thread::sleep(Duration::from_millis(delay));
+        }
+        if i < pixels.len() {
+            let pixel = &pixels[i];
+            canvas
+                .pixel(pixel.x, pixel.y, Color::RGB(255, 255, 255))
+                .unwrap();
+            canvas.present();
+        }
+
+        i += 1;
+    }
 }
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