renderer can navigate forward in time (and also in the + or - z direction)

Can't navigate backward yet

src/render.rs

@@ -1,16 +1,17 @@
-use ansi_term::Color::RGB;
 use crate::geom::{Index, Meters, Vec2, Vec3, Vec3u};
 use crate::{flt::{Flt, Real}, Material as _};
 use crate::mat;
 use crate::sim::{Cell, GenericSim};
 use crate::meas::AbstractMeasurement;
+use crossterm::{cursor, ExecutableCommand as _, QueueableCommand as _};
+use crossterm::style::{style, Color, PrintStyledContent, StyledContent as _};
 use font8x8::{BASIC_FONTS, GREEK_FONTS, UnicodeFonts as _};
 use log::{trace, info};
 use plotly;
 use image::{RgbImage, Rgb};
 use imageproc::{pixelops, drawing};
 use std::fs::File;
-use std::io::BufWriter;
+use std::io::{BufWriter, Write as _};
 use std::path::PathBuf;
 use std::sync::{Mutex, RwLock};
 use y4m;
@@ -274,17 +275,25 @@ pub struct ColorTermRenderer;
 
 impl Renderer for ColorTermRenderer {
     fn render_with_image(&self, _state: &dyn GenericSim, im: &RgbImage) {
-        let square = "█";
-        let buf: String = im
-            .enumerate_rows()
-            .map(|(_y, row)| {
-                format!("{}\n", row.map(|(_x, _y, p)| {
-                    format!("{}", RGB(p.0[0], p.0[1], p.0[2]).paint(square))
-                }).collect::<String>())
-            })
-            .collect();
-
-        println!("{}", buf);
+        // TODO: should scale the image to the size of the terminal!
+        let mut stdout = std::io::stdout();
+        let (w, h) = crossterm::terminal::size().unwrap();
+        stdout.queue(cursor::MoveTo(0, 0));
+        for (y, row) in im.enumerate_rows() {
+            if y >= h.into() {
+                break;
+            }
+            stdout.queue(cursor::MoveDown(1));
+            stdout.queue(cursor::MoveToColumn(0));
+            for (_x, _y, p) in row {
+                stdout.queue(PrintStyledContent(style(" ").on(Color::Rgb {
+                    r: p.0[0],
+                    g: p.0[1],
+                    b: p.0[2],
+                })));
+            }
+        }
+        stdout.flush();
     }
 }