first steps

src/level.rs

@@ -0,0 +1,38 @@
+#[derive(Copy, Clone, Debug, PartialEq)]
+enum LevelElement {
+    Wall,
+    Floor,
+    StairDown,
+    StairUp,
+}
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub struct Level {
+    structure: [[LevelElement; 25]; 80],
+}
+
+impl Level {
+    pub fn new() -> Level {
+        let mut s = [[LevelElement::Wall; 25]; 80];
+        s[4][4] = LevelElement::StairDown;
+        s[75][20] = LevelElement::StairUp;
+        Level {
+            structure: s
+        }
+    }
+    pub fn get_element(&self, x: usize, y: usize) -> Option<LevelElement> {
+        if x >= 80 || y >= 25 {
+            return None;
+        }
+        Some(self.structure[x][y])
+    }
+}
+
+#[test]
+fn test_get_element() {
+    let l = Level::new();
+    assert_eq!(l.get_element(0, 0).unwrap(), LevelElement::Wall);
+    assert_eq!(l.get_element(4, 4).unwrap(), LevelElement::StairDown);
+    assert_eq!(l.get_element(79, 24).unwrap(), LevelElement::Wall);
+    assert_eq!(l.get_element(80, 25), None);
+}