Diff: snake_engine/snake_engine.cpp

Revision:

20:980b37fde361

Parent:

18:e58a1f8e72ad

Child:

21:7f7d09a27cc8

--- a/snake_engine/snake_engine.cpp	Tue May 08 12:51:40 2018 +0000
+++ b/snake_engine/snake_engine.cpp	Tue May 08 13:41:08 2018 +0000
@@ -2,7 +2,7 @@
 
 snake_engine::snake_engine()
 {
-  clision = 0;
+  clision = 0;// 0 means there is no collision
 }
 
 snake_engine::~snake_engine()
@@ -14,12 +14,12 @@
     s.init();
 
 }
-
+//draw the snake , fruit , and point
 void snake_engine::draw(N5110 &lcd)
 {
         lcd.refresh();
         lcd.clear();
-        lcd.drawRect(0,8,WIDTH ,HEIGHT -8,FILL_TRANSPARENT);    
+        lcd.drawRect(0,8,WIDTH ,HEIGHT -8,FILL_TRANSPARENT);  // the squre on the screen  
 
     s.draw(lcd);
     f.draw(lcd);
@@ -27,20 +27,20 @@
 }
 
 
-void snake_engine::update(Gamepad &pad, N5110 &lcd)
+void snake_engine::update(Gamepad &pad, N5110 &lcd)//update the game
 {
-    s.update(_d,_mag); 
-    collision(pad, lcd);
+    s.update(_d,_mag); //update direction of snake
+    collision(pad, lcd);//update collision
   
 
-    if(getfruit(pad)) {
-        f.reborn(); 
-        s.point(); 
+    if(getfruit(pad)) {//boolean value. return ture and false
+        f.reborn(); //reborn randomly the fruit when the old fruit is ate by snake 
+        s.point(); //update the point 
         
     }
 }
 
-
+//read the command from gamepad. From Pong sample code
 void snake_engine::read_input(Gamepad &pad)
 {
     _d = pad.get_direction();
@@ -48,7 +48,7 @@
 }
 
 
-bool snake_engine::getfruit(Gamepad &pad)
+bool snake_engine::getfruit(Gamepad &pad)//boolean function. if the snake eat fruit . returns true, else false.
 {
     Vector2D _f_pos = f.get_pos();
     Vector2D _s_pos = s.get_pos();
@@ -65,37 +65,27 @@
 }
 
  
-
+//lcd print the point
 void snake_engine::printpoint(N5110 &lcd)
 {
-    int snakepoint = s.get_point();
+    int snakepoint = s.get_point();// from the snake function,  get the points 
     char buffer[14];
     sprintf(buffer,"%2d",snakepoint);
-    lcd.printString(buffer,WIDTH/2 - 40,0); 
+    lcd.printString(buffer,WIDTH/2 - 40,0); //print the point on the left top corner on the screen
 }
 
 
 
 
-void snake_engine::collision(Gamepad &pad,N5110 &lcd)
+void snake_engine::collision(Gamepad &pad,N5110 &lcd)//check whether the snake hit the wall or not.
 {
     Vector2D _s_poss = s.get_pos();
         if (((_s_poss.x >= WIDTH -2) || (_s_poss.x <= 1)) ||((_s_poss.y >= HEIGHT -1) || (_s_poss.y <= 8))  ) {
             lcd.clear(); 
-                 clision = 1;
+                 clision = 1;//if the snake position on X and Y equal to the wall. then it happens. clision = 1.
     }
    
 }
 
 
 
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