some basic map-drawing

src/grid.rs

@@ -0,0 +1,74 @@
+extern crate gunpowder_treason as gt;
+#[macro_use] extern crate itertools;
+
+const MAP: &'static [u8] =
+    b"0000000000000000000001110000111100111100111111001111001001000111010011\
+1111101110000001001111010011100111111000000100000001111111111111111100\
+0111111000000000010001111110111011111110000001001110111111100111010011\
+1011111110011101000100001000000111111111000010000001110100010001110000\
+0111010011110111111000000100111101110010011101001111000000100111111011\
+1101110010011100101111011111100010001000000111001001110111110001110110\
+0010011111110111011001110111110101110111001001111101111101100111011111\
+000111000000000000000000000000";
+
+fn main() {
+    let (w, h) = (11.0, 14.0);
+    let mut drawing = gt::svg(w, h);
+    drawing.add(gt::rect((0.0, 0.0), (11.0, 14.0)));
+    const N: f64 = 0.5;
+    let rows: usize = ((w - 1.0) / N).floor() as usize;
+    let cols: usize = ((h - 1.0) / N).floor() as usize;
+    let x_offset = (w - (rows as f64 * N)) / 2.0;
+    let y_offset = (h - (cols as f64 * N)) / 2.0;
+
+    let get_cell = |x: usize, y: usize| {
+        let idx = x + y * rows;
+        MAP[idx]
+    };
+
+    for (x, y) in iproduct!(0..rows-1, 0..cols-1) {
+        let xc = x_offset + x as f64 * N;
+        let yc = y_offset + y as f64 * N;
+        let d = N / 5.0;
+        let cs = N / 10.0;
+        if get_cell(x, y) != get_cell(x + 1, y) {
+            drawing.add(gt::line(xc+N, yc).to(xc+N, yc+N));
+
+            let xt = if get_cell(x, y) == '0' as u8 {
+                xc + N - 0.1
+            } else {
+                xc + N + 0.1
+            };
+            for n in 0..10 {
+                let yt = yc + cs * (n as f64 + 0.5);
+                drawing.add(gt::line(xc+N, yt).to(xt, yt));
+            }
+
+        } else if get_cell(x, y) == '1' as u8 {
+            for n in 1..5 {
+                drawing.add(gt::line(xc+N, yc + d * n as f64));
+            }
+        }
+
+        if get_cell(x, y) != get_cell(x, y+1) {
+            drawing.add(gt::line(xc, yc+N).to(xc+N, yc+N));
+
+            let yt = if get_cell(x, y) == '0' as u8 {
+                yc + N - 0.1
+            } else {
+                yc + N + 0.1
+            };
+            for n in 0..10 {
+                let xt = xc + cs * (n as f64 + 0.5);
+                drawing.add(gt::line(xt, yc+N).to(xt, yt));
+            }
+
+        } else if get_cell(x, y) == '1' as u8 {
+            for n in 1..5 {
+                drawing.add(gt::line(xc + d * n as f64, yc+N));
+            }
+        }
+    }
+
+    drawing.to_stdout();
+}