ELEC2645 (2015/16) / Mbed 2 deprecated SnakeProjectRev1

Dependencies:   Joystick N5110 SDFileSystem beep fsmMenu mbed

Fork of SnakeProjectRev1 by Meurig Phillips

Revision:
4:3ceebacef5f1
Parent:
3:0e3179c452c5
Child:
5:257b4816ac6a
--- a/main.cpp	Wed Apr 06 11:52:25 2016 +0000
+++ b/main.cpp	Wed Apr 06 12:42:02 2016 +0000
@@ -78,12 +78,20 @@
 int snakeTailY[100];
 int snakeTailLength;
 
+int i = 41; // snake head origin x
+int j = 23; // snake head origin y
+int prev_i;
+int prev_j;
+int prev2_i;
+int prev2_j;
+
 // function prototypes
 void calibrateJoystick();
 void updateJoystick();
 void joystickDirection();
 void generateFood();
 void newFruitValues();
+void moveSnake();
 
  
 int main()
@@ -93,12 +101,7 @@
     pollJoystick.attach(&updateJoystick,1.0/10.0);  // read joystick 10 times per second
 
     
-    int i = 41; // snake head origin x
-    int j = 23; // snake head origin y
-    int prev_i;
-    int prev_j;
-    int prev2_i;
-    int prev2_j;
+   
 
     
     srand(time(NULL));
@@ -115,143 +118,21 @@
             printFlag = 0;
             
             joystickDirection();
-                
-            if (joystick.direction == LEFT) {
-                if (currentDirection != right) { // user can't turn opposite way
-                currentDirection = left; // direct enum updated
-                }
-                while (currentDirection == left) { // enters left movement loop
-                lcd.clear();
-                prev2_i = prev_i;
-                prev2_j = prev_j;
-                prev_i = i;
-                prev_j = j;
-                i -= 2; // shifts two pixels (snake thickness)
-                lcd.drawRect(i,j,1,1,1); // snake head
-                lcd.drawRect(prev_i,prev_j,1,1,1);
-                lcd.drawRect(prev2_i,prev2_j,1,1,1);
-                lcd.drawRect(randomX,randomY,1,1,1); // food
-                if (i == randomX && j == randomY) { // if fruit is eaten
-                    snakeTailLength++;
-                    newFruitValues();
-                    generateFood();  
-                    }
-                wait(1.0);
-                if (joystick.direction == UP) {
-                    currentDirection = up; // direction enum updated, this while loop ends, up while loop starts
-                    }
-                if (joystick.direction == DOWN) {
-                    currentDirection = down; // direction enum updated, this while loop ends, down while loop starts
-                    }
-                }
-            }
-            if (joystick.direction == RIGHT) {
-                if (currentDirection != left) {
-                currentDirection = right;
-                }
-                while (currentDirection == right) {
-                lcd.clear();
-                prev2_i = prev_i;
-                prev2_j = prev_j;
-                prev_i = i;
-                prev_j = j;
-                i += 2;
-                lcd.drawRect(i,j,1,1,1); // snake head
-                lcd.drawRect(prev_i,prev_j,1,1,1);
-                lcd.drawRect(prev2_i,prev2_j,1,1,1);
-                lcd.drawRect(randomX,randomY,1,1,1); // food
-                if (i == randomX && j == randomY) { // if fruit is eaten
-                    snakeTailLength++;
-                    newFruitValues();
-                    generateFood();  
-                    }
-                wait(1.0);
-                if (joystick.direction == UP) {
-                    currentDirection = up; // direction enum updated, this while loop ends, up while loop starts
-                    }
-                if (joystick.direction == DOWN) {
-                    currentDirection = down; // direction enum updated, this while loop ends, down while loop starts
-                    }
-                }
-            }
-            if (joystick.direction == UP) {
-                if (currentDirection != down) {
-                currentDirection = up; 
-                }
-                while (currentDirection == up) {
-                lcd.clear();
-                prev2_i = prev_i;
-                prev2_j = prev_j;
-                prev_i = i;
-                prev_j = j;
-                j -= 2;
-                lcd.drawRect(i,j,1,1,1); // snake head
-                lcd.drawRect(prev_i,prev_j,1,1,1);
-                lcd.drawRect(prev2_i,prev2_j,1,1,1);
-                lcd.drawRect(randomX,randomY,1,1,1); // food
-                if (i == randomX && j == randomY) { // if fruit is eaten
-                    snakeTailLength++;
-                    newFruitValues();
-                    generateFood();  
-                    }
-                wait(1.0);
-                if (joystick.direction == LEFT) {
-                    currentDirection = left; // direction enum updated, this while loop ends, left while loop starts
-                    }
-                if (joystick.direction == RIGHT) {
-                    currentDirection = right; // direction enum updated, this while loop ends, right while loop starts
-                    }
-                }
-            }
-            if (joystick.direction == DOWN) {
-                if (currentDirection != up) {
-                currentDirection = down;
-                }
-                while (currentDirection == down) { 
-                lcd.clear();
-                prev2_i = snakeTailX[];
-                prev2_j = snakeTailY[];
-                snakeTailX[] = prev_i;
-                snakeTailY[] = prev_j;
-                prev_i = i;
-                prev_j = j;
-                j += 2;
-                lcd.drawRect(i,j,1,1,1); // snake head
-                for (k=0; k<snakeTailLength; k++) {
-                    lcd.drawRect(prev_i,prev_j,1,1,1);
-                    }
-                lcd.drawRect(randomX,randomY,1,1,1); // food
-                if (i == randomX && j == randomY) { // if fruit is eaten
-                    snakeTailLength++;
-                    newFruitValues();
-                    generateFood();  
-                    }
-                wait(1.0);
-                if (joystick.direction == LEFT) {
-                    currentDirection = left; // direction enum updated, this while loop ends, left while loop starts
-                    }
-                if (joystick.direction == RIGHT) {
-                    currentDirection = right; // direction enum updated, this while loop ends, right while loop starts
-                    } 
-                }
-            }
-            
-                
- 
-        }
-                // put the MCU to sleep until an interrupt wakes it up
-                sleep();
+            moveSnake();
+        } 
+            sleep(); // put the MCU to sleep until an interrupt wakes it up
     }
 }
  
-// read default positions of the joystick to calibrate later readings
-void calibrateJoystick()
+
+void calibrateJoystick() // read default positions of the joystick to calibrate later readings
 {
     button.mode(PullDown);
     // must not move during calibration
     joystick.x0 = xPot;  // initial positions in the range 0.0 to 1.0 (0.5 if centred exactly)
     joystick.y0 = yPot;
 }
+
 void updateJoystick()
 {
     // read current joystick values relative to calibrated values (in range -0.5 to 0.5, 0.0 is centred)
@@ -298,10 +179,9 @@
 
 }
 
-void newFruitValues()
+void newFruitValues() // new fruit coordinate values are given before it is passed to the generateFood function
 {
-        // new fruit coordinate values are given before it is passed to the generateFood function
-                
+                 
         randomX =  rand() % 83 + 1;     // randomX in the range 1 to 81
         randomY =  rand() % 47 + 1;     // randomY in the range 1 to 47
         randomXoddEven = randomX%2; // find out whether odd or even
@@ -309,7 +189,7 @@
  
 }
 
-void joystickDirection() {
+void joystickDirection() { // stcik direction for debug
  
  serial.printf("x = %f y = %f button = %d ",joystick.x,joystick.y,joystick.button);
  
@@ -328,4 +208,55 @@
                 serial.printf(" Unsupported direction\n");
 
  }
-             
\ No newline at end of file
+ 
+void moveSnake() {
+    
+    if (joystick.direction == LEFT) { 
+                if (currentDirection != right) { // change the currentDirection according to joystick input, providing
+                currentDirection = left;         // it's not the opposite direction to the current direction
+                }
+                }
+    else if (joystick.direction == RIGHT) {
+                if (currentDirection != left) { // change the currentDirection according to joystick input, providing
+                currentDirection = right;       // it's not the opposite direction to the current direction
+                }
+                }
+    else if (joystick.direction == UP) {
+                if (currentDirection != down) { // change the currentDirection according to joystick input, providing
+                currentDirection = up;          // it's not the opposite direction to the current direction
+                }
+                }
+    else if (joystick.direction == DOWN) {
+                if (currentDirection != up) { // change the currentDirection according to joystick input, providing
+                currentDirection = down;      // it's not the opposite direction to the current direction
+                }
+                }
+                
+                lcd.clear();
+                prev2_i = prev_i; // previous coordinates of the previous snake head coordinates
+                prev2_j = prev_j;
+                prev_i = i; // previous coordinates of the snake head
+                prev_j = j;
+                
+                if (currentDirection == left) { // shift snake head coordinates according to current direction
+                i -= 2; }
+                else if (currentDirection == right) {
+                i += 2; }
+                else if (currentDirection == up) {
+                j -= 2; }
+                else if (currentDirection == down) {
+                j += 2; }
+                
+                lcd.drawRect(i,j,1,1,1); // snake head
+                lcd.drawRect(prev_i,prev_j,1,1,1); // seg 1
+                lcd.drawRect(prev2_i,prev2_j,1,1,1); // seg 2
+                lcd.drawRect(randomX,randomY,1,1,1); // food
+                
+                if (i == randomX && j == randomY) { // if fruit is eaten
+                    snakeTailLength++;
+                    newFruitValues();
+                    generateFood();  
+                    }
+                wait(1.0);
+    
+ }         
\ No newline at end of file