Diff: main.cpp

Revision:

0:62b17bedfb7c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon May 11 21:47:51 2015 +0000
@@ -0,0 +1,374 @@
+#include "mbed.h"
+#include "N5110.h"
+
+/**
+@ snake maximum body columns value can be used
+*/
+int snakeColumns[84];
+
+/**
+@ snake maximum body columns value can be used
+*/
+int snakeRows[48];
+
+/**
+@ all pixels were seted
+@ param.84 - x value to add
+@ param.48 - y value to add
+*/
+char cells[84][48];//all pix
+
+/**
+@ define the structure of snake
+@ param.x - initial x value of snake to add
+@ param.y - initial y value of snake to add
+@ param.headx - x-coordinate of snake head to add
+@ param.heady - y-coordinate of snake head to add
+*/
+typedef struct Snake Snake;//structure of snake
+struct Snake {//structure of snake
+    int x;//initial x value of snake
+    int y;//initial y value of snake
+    int headx;//x-coordinate of snake head
+    int heady;//y-coordinate of snake tail
+};
+
+/**
+@define the name of snake
+*/
+Snake snake;//name of Snake
+
+
+int Food_x=20;//initial x value of Food
+int Food_y=20;//initial y value of Food
+
+/**
+@define the direction of snake's movement
+*/
+int up;
+int down;
+int left;
+int right;
+
+/**
+@initialize the value of LED when LED is not lighted
+*/
+int LED = 0;
+
+
+/**
+@initialize the value of score
+*/
+const char score=0;
+
+/**
+@ initialize the value of snake length and snake's life and the food appears
+@param.snakeLength - snake length to add
+@param.snakelife - snake is alive to add
+@param.foodyes - food appears to add
+*/
+int snakeLength = 6;
+int snakelife = 1;
+int foodyes = 1;
+// change this to alter tolerance of joystick direction
+#define DIRECTION_TOLERANCE 0.05
+
+/**
+@ connections for joystick
+*/
+AnalogIn xPot(p15);
+AnalogIn yPot(p16);
+DigitalIn button(p17);
+N5110 lcd(p7,p8,p9,p10,p11,p13,p26);
+
+/**
+@ timer to regularly read the joystick
+*/
+Ticker pollJoystick;
+/**
+@ Serial for debug
+*/
+Serial serial(USBTX,USBRX);
+
+/**
+@ create enumerated type (0,1,2,3 etc. for direction)
+@ could be extended for diagonals etc.
+*/
+enum DirectionName {
+    UP,
+    DOWN,
+    LEFT,
+    RIGHT,
+    CENTRE,
+    UNKNOWN
+}
+
+/**
+@define the struct for Joystick
+@ param.x - current x value to add
+@ param.y - current y value to add
+@ param.x0 - centred x value to add
+@ param.y0 - centred y value to add
+@ copied from sample code, but do not know why they have error
+*/
+typedef struct JoyStick Joystick;
+struct JoyStick {
+    float x;    // current x value
+    float x0;   // 'centred' x value
+    float y;    // current y value
+    float y0;   // 'centred' y value
+    int button; // button state (assume pull-down used, so 1 = pressed, 0 = unpressed)
+    DirectionName direction;  // current direction
+};
+/**
+@ create struct variable
+*/
+Joystick joystick;
+
+int printFlag = 0;
+
+/**
+@ function prototypes
+*/
+void calibrateJoystick();
+void updateJoystick();
+void light();
+void wholeSnake();
+void drawSnake();
+void drawFood();
+void moveSnake();
+void eatFood();
+void crashCheck();
+void endGame();
+
+/**
+@ main code
+@ calibrateJoystick() - get centred value of joystick
+@ read joystick 10 times per second
+@control the joysick
+*/
+int main()
+{
+    calibrateJoystick();  // get centred values of joystick
+    pollJoystick.attach(&updateJoystick,1.0/10.0);  // read joystick 10 times per second
+
+    while(1) {
+
+        if (printFlag) {  // if flag set, clear flag and print joystick values to serial port
+            printFlag = 0;
+            serial.printf("x = %f y = %f button = %d ",joystick.x,joystick.y,joystick.button);
+
+            // check joystick direction
+            if (joystick.direction == UP)
+                serial.printf(" UP\n");
+            if (joystick.direction == DOWN)
+                serial.printf(" DOWN\n");
+            if (joystick.direction == LEFT)
+                serial.printf(" LEFT\n");
+            if (joystick.direction == RIGHT)
+                serial.printf(" RIGHT\n");
+            if (joystick.direction == CENTRE)
+                serial.printf(" CENTRE\n");
+            if (joystick.direction == UNKNOWN)
+                serial.printf(" Unsupported direction\n");
+
+        }
+
+        if (button ==0) { //button state assume pull-down used, 0 = unpressed
+            lcd. printString ("Game Start", 2,2);// print cover
+            lcd. printString ("By Troy",3,3);//print cover
+        } else {
+            lcd.clear();//function of clear screen
+            light();//function to light the led
+            drawSnake();//draw a snake
+            drawFood();//draw food
+            moveSnake();
+            eatFood();//function of checking the snake eat food
+            crashCheck();//check the collision detection
+            endGame();
+            wait(0.2);//wait 0.2 second repeat the whine loop
+
+        }
+    }
+}
+/**
+@ read default positions of the joystick to calibrate later readings
+@ initial positions in the range 0.0 to 1.0 (0.5 if centred exactly)
+@ param.joystick.x0, value of x0 is to add
+@ param.joystick.y0, value of y0 is to add
+*/
+void calibrateJoystick()
+{
+    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;
+}
+
+/**
+@ read value from joystick
+*/
+void updateJoystick()
+{
+    // read current joystick values relative to calibrated values (in range -0.5 to 0.5, 0.0 is centred)
+    joystick.x = xPot - joystick.x0;
+    joystick.y = yPot - joystick.y0;
+    // read button state
+    joystick.button = button;
+
+
+    /**
+    @ calculate direction depending on x,y values
+    @ tolerance allows a little lee-way in case joystick not exactly in the stated direction
+    */
+    if ( fabs(joystick.y) < DIRECTION_TOLERANCE && fabs(joystick.x) < DIRECTION_TOLERANCE) {
+        joystick.direction = CENTRE;
+
+    } else if ( joystick.y > DIRECTION_TOLERANCE && fabs(joystick.x) < DIRECTION_TOLERANCE) {
+        joystick.direction = UP;
+        snake.y = snake.y-1;
+    } else if ( joystick.y < DIRECTION_TOLERANCE && fabs(joystick.x) < DIRECTION_TOLERANCE) {
+        joystick.direction = DOWN;
+        snake.y = snake.y+1;
+    } else if ( joystick.x > DIRECTION_TOLERANCE && fabs(joystick.y) < DIRECTION_TOLERANCE) {
+        joystick.direction = RIGHT;
+        snake.x = snake.x+1;
+    } else if ( joystick.x < DIRECTION_TOLERANCE && fabs(joystick.y) < DIRECTION_TOLERANCE) {
+        joystick.direction = LEFT;
+        snake.x = snake.x-1;
+    } else {
+        joystick.direction = UNKNOWN;
+    }
+    /**
+    @ set flag for printing
+    */
+    printFlag = 1;
+
+    lcd.init();//initialize nokia N5110
+    lcd.setBrightness(0.5); // put backlight on 50%
+    calibrateJoystick();  // get centred values of joystick
+    pollJoystick.attach(&updateJoystick,1.0/10.0);  // read joystick 10 times per second
+    lcd.refresh();//reset the screen
+}
+/**
+define the light function
+*/
+void light()
+{
+    if (button == 1)
+        LED = 1;
+    else
+        LED = 0;
+}
+
+/**
+define the wholeSnake function
+*/
+void wholeSnake()
+{
+
+    snake.x = 5;
+    snake.y = 5;
+    snake.headx = 11;
+    snake.heady = 7;
+
+}
+
+
+/**
+define the eatFood function
+*/
+void eatFood()
+{
+    while (1) {
+
+        if(foodyes == 1) {
+            srand(time(NULL));
+            int Food_x = rand() % 84;
+            int Food_y= rand() % 48;
+            while(Food_x%84 != 0)
+                Food_x++;
+            while(Food_y%48 != 0)
+                Food_y++;
+        }
+
+    }
+
+    /**
+    define the darwSnake function
+    */
+    void drawSnake() {
+
+        lcd.drawRect(snake.x,snake.y,6,2,1);//draw the rectangle with top left position, height, width and fill the rectangle in black
+    
+    }
+
+    /**
+    define the drawFood function
+    */
+    void drawFood() { //method to define drawFood function
+        
+        lcd.drawRect(Food_x,Food_y,2,2,1);//draw the rectangle with top left position, height, width and fill the rectangle in black
+        
+    }
+
+    /**
+    define the moveSnake function
+    */
+    void moveSnake() { //method to define moveSnake function
+        button == 1;// button of joystick is pressed
+
+        switch (direction) {//check the direction of the joystick button is pressed
+            case up:  //when the direction of joystick is up
+                snake.y = snake.y-1;//the change of y value fron joystick
+                break;
+                jump out
+
+            case down;
+                snake.y = snake.y+1;
+                break;
+
+            case left;
+                snake.x = snake.x+1;
+                break;
+
+            case right;
+                snake.x = snake.x+1;
+                break;
+        }
+    }
+
+    /**
+    define the crashCheck function
+    */
+    void crashCheck() { //method to define endGame function
+        while(1) { //infinite loop
+
+            // if snake hit itself
+            if (snake.headx == snake.x && snake.heady == snake.y) {//coordinate of snake head is equal to snake tail
+                snakelife = 0;// snake dead
+                endGame();//game end
+            }
+
+
+            //if snake hit wall
+            if (snake.x > 47 || snake.x < 0  || snake.y < 0 || snake.y > 83) {//the limit of top and bottom side
+                //the limit of left and right side
+                //check the snake head over the value of four sides
+                snakelife = 0;// snake dead
+                endGame();//game end
+
+            }
+        }
+    }
+
+    /**
+    define the endGame function
+    */
+    void endGame () { //method to define endGame function
+
+        lcd.printString ("END!", 29, 0);//the position and word"End" are printed on LCD display
+        lcd.printString ("Score: ", 10, 2);//the position and word"Score" are printed on LCD display
+        lcd.printString (score, 20, 2);//the position and number are printedon LCD display
+        wait (0.2);
+}