Added vectors indicators

src/main.rs

@@ -20,13 +20,13 @@ const WINDOW_HEIGHT:i32 = 600;
 const WINDOW_WIDTH:i32 = 800;
 const BIRD_SPEED:i32 = 2;
 const MAX_BIRD_SPEED:i32 = 15;
-const BIRDS_COUNT:i32 = 500;
+const BIRDS_COUNT:i32 = 200;
 const BIRD_SIZE:i32 = 15;
 
-const VISION_RANGE:i32 = 150;
+const VISION_RANGE:i32 = 100;
 const COHERENCE_RATE:i32 = 1;
 const SEPRATION_RATE:i32 = 1;
-const ALIGNEMENT_RATE:i32 = 2;
+const ALIGNEMENT_RATE:i32 = 1;
 const NEIGHBOUR_TRESHOLD:i32 = 10;
 
 pub struct Bird{
@@ -41,9 +41,14 @@ impl Simulation{
     pub fn render(&mut self,ctx:&mut sdl2::render::Canvas<sdl2::video::Window>){
         ctx.set_draw_color(Color::RGB(0x6D, 0x6D, 0x64));
         ctx.clear();
-        ctx.set_draw_color(Color::RGB(0x33, 0x33, 0x33));
+        
         for bird in self.birds.iter(){
+            ctx.set_draw_color(Color::RGB(0x33, 0x33, 0x33));
             ctx.fill_rect(bird.shape).expect("Rusty Boids");
+            ctx.set_draw_color(Color::RGB(0xe7, 0x4c, 0x3c));
+            let start_pos = Point::new(bird.shape.x + bird.shape.width() as i32 / 2,bird.shape.y + bird.shape.height() as i32 /2);
+            let end_pos = Point::new(start_pos.x + bird.velocity.x * 2,start_pos.y + bird.velocity.y * 2);
+            ctx.draw_line(start_pos,end_pos).expect("Could nor draw vector line");
         }
     }
     pub fn apply_coherence(&mut self){
@@ -177,29 +182,62 @@ impl Simulation{
             let mut posy = bird.shape.y;
             let width:i32 = bird.shape.width() as i32;
             let height:i32 = bird.shape.height() as i32;
-            //let left_wall = WINDOW_WIDTH - width;
-            //let bottom_wall = WINDOW_HEIGHT- height;
 
-            if posx + bird.velocity.x > WINDOW_WIDTH - width{
+            let push_back = 1;
-                posx = 0;
+            let soft_border_margin = 30;
-                //bird.velocity.x -= bird.velocity.x / 2;
+            let left_soft_border = 0 + soft_border_margin;
+            let right_soft_border = WINDOW_WIDTH - soft_border_margin;
+            let top_soft_border = 0 + soft_border_margin;
+            let bottom_soft_border = WINDOW_HEIGHT -soft_border_margin;
+
+            
+            if posx + bird.velocity.x > WINDOW_WIDTH - width || posx + bird.velocity.x < 0{
+                bird.velocity.x = 0;
             }
-            if posx + bird.velocity.x < 0{
+            if posy + bird.velocity.y > WINDOW_HEIGHT - height || posy + bird.velocity.y < 0{
-                posx = WINDOW_WIDTH - bird.shape.width() as i32;
+                bird.velocity.y = 0;
-                //bird.velocity.x += bird.velocity.x / 2;
+            }
+            
+            if posx + bird.velocity.x > right_soft_border && bird.velocity.x <= 0{
+                //the bird is coming from the border so we accelerate it
+                bird.velocity.x -= push_back;
+            }else{
+                bird.velocity.x += push_back;
+            }
+            if posx - bird.velocity.x < left_soft_border && bird.velocity.x >= 0{
+                //the bird is coming from the border so we accelerate it
+                bird.velocity.x += push_back;
+            }else{
+                bird.velocity.x -= push_back;
             }
 
-            if posy + bird.velocity.y > WINDOW_HEIGHT - height{
+            if posy + bird.velocity.y > bottom_soft_border && bird.velocity.y <= 0{
-                posy = 0;
+                //the bird is coming from the border so we accelerate it
-                //bird.velocity.y -= bird.velocity.y / 2;
+                bird.velocity.y -= push_back;
+            }else{
+                bird.velocity.y += push_back;
             }
-            if posy + bird.velocity.y < 0{
+            if posy - bird.velocity.y < top_soft_border && bird.velocity.y >= 0{
-                posy = WINDOW_HEIGHT - bird.shape.height() as i32;
+                //the bird is coming from the border so we accelerate it
-                //bird.velocity.x += bird.velocity.x / 2;
+                bird.velocity.y += push_back;
+            }else{
+                bird.velocity.y -= push_back;
             }
 
-            posx += bird.velocity.x;
+            if bird.velocity.y > MAX_BIRD_SPEED{
-            posy += bird.velocity.y;
+                bird.velocity.y = MAX_BIRD_SPEED;
+            }else if bird.velocity.y < -MAX_BIRD_SPEED{
+                bird.velocity.y = -MAX_BIRD_SPEED;
+            }
+            if bird.velocity.x > MAX_BIRD_SPEED{
+                bird.velocity.x = MAX_BIRD_SPEED;
+            }else if bird.velocity.x < -MAX_BIRD_SPEED{
+                bird.velocity.x = -MAX_BIRD_SPEED;
+            }
+            
+
+            posx += bird.velocity.x / 2;
+            posy += bird.velocity.y / 2;
             bird.shape.set_x(posx);
             bird.shape.set_y(posy);
         }