fix foodgen to use correct dim, add limit on food

src/lib/entity.rs

@@ -203,20 +203,21 @@ impl Renderable for Food {
 // no position, does not get rendered yet acts per turn
 #[derive(Clone)]
 pub struct FoodGenerator {
-    counter: u32,
+    timer: u32,
     pos: Point,
-    id: u32
+    id: u32,
+    counter: u32
 }
 
 impl FoodGenerator {
     pub fn new() -> FoodGenerator {
-        FoodGenerator { counter: 0, id: 0, pos: Point(0,0) }
+        FoodGenerator { timer: 0, id: 0, pos: Point(0,0), counter: 0 }
     }
 }
 
 impl AI for FoodGenerator {
     fn step(&mut self, b: &Screen, w: &mut World) -> BoardCommand {
-        if self.counter % 600 == 0 {
+        if self.timer % 600 == 0 && self.counter < 10 {
             // generate random coords, if valid, spawn
             // if not, try again next step
             let (min, max) = b.get_dimensions();
@@ -225,9 +226,10 @@ impl AI for FoodGenerator {
             let r_x = rng.gen_range(min.0..max.0 + 1);
             let r_y = rng.gen_range(min.1..max.1 + 1);
             
+            self.counter += 1;
             return BoardCommand::SpawnFood(Point(r_x, r_y));
         }
-        self.counter += 1;
+        self.timer += 1;
         BoardCommand::Noop
     }
 }

src/lib/screen.rs

@@ -49,7 +49,7 @@ impl Screen {
     }
 
     pub fn get_dimensions(&self) -> (Point, Point) {
-        (Point(-self.max_x, -self.max_y), Point(self.max_x, self.max_y))    
+        (Point(0,0), Point(self.max_x, self.max_y))    
     }
 }