Buffer the rendering for better framerates; create a more useful example

examples/coremem.rs

@@ -4,23 +4,13 @@ use coremem::consts;
 use std::{thread, time};
 
 fn main() {
-    let mut state = SimState::new(64, 16);
+    let mut state = SimState::new(101, 101);
+    let mut step = 0u64;
     loop {
-        state.impulse_ey(7, 2, 1.0);
+        step += 1;
+        state.impulse_ey(50, 50, 50f32 * ((step as f64)*0.1f64).sin() as f32);
         Renderer.render(&state);
         state.step();
-        thread::sleep(time::Duration::from_millis(50));
-        state.impulse_ey(50, 10, 1.0);
-        Renderer.render(&state);
-        state.step();
-        thread::sleep(time::Duration::from_millis(50));
-        state.impulse_ey(7, 2, -1.0);
-        Renderer.render(&state);
-        state.step();
-        thread::sleep(time::Duration::from_millis(50));
-        state.impulse_ey(50, 10, -1.0);
-        Renderer.render(&state);
-        state.step();
-        thread::sleep(time::Duration::from_millis(50));
+        thread::sleep(time::Duration::from_millis(33));
     }
 }

src/render.rs

@@ -1,6 +1,7 @@
 use ansi_term::Color::RGB;
 use crate::consts;
 use crate::SimState;
+use std::fmt::Write as _;
 
 pub struct NumericTermRenderer;
 
@@ -34,17 +35,19 @@ fn norm_color(v: f32) -> u8 {
 
 impl ColorTermRenderer {
     pub fn render(&self, state: &SimState) {
+        let mut buf = String::new();
         let square = "█";
         for y in 0..state.height() {
             for x in 0..state.width() {
                 let cell = state.get(x, y);
-                let r = norm_color(cell.bz() * consts::C);
+                //let r = norm_color(cell.bz() * consts::C);
+                let r = 0;
                 let g = norm_color(cell.ex());
                 let b = norm_color(cell.ey());
-                print!("{}", RGB(r, g, b).paint(square));
+                write!(&mut buf, "{}", RGB(r, g, b).paint(square));
             }
-            print!("\n");
+            write!(&mut buf, "\n");
         }
-        print!("\n");
+        println!("{}", buf);
     }
 }