File content as of revision 2:748d7682d43c:

#include "main.h"
// this game is similar to flappy bird
// the ball will always drop so player should use joystick up 
// if the ball touch the ground or half ball over the highest line, the game will finish
// if the ball touch the line, the game will finish
// press button could stop the game and press again to play 
// when the game start, the led will fliker
// when the game finish, the buzzer will sound
int main()
{
// first need to initialise display+
    lcd.init();
    button.fall(&ting);
    button.mode(PullDown);

//show the name of this game
    lcd.printString("Flappy ball",10,1); //show game name
    lcd.printString("YangQing",10,3);    //show desgin name
    lcd.printString("200986056",10,5);   //show student code

    wait(0.5);                           //keep screen 0.5s
    lcd.clear();                         //clear screen show another screen

//just simulate the loading
    lcd.printString("LOADING...",8,2);
    char loading [14];
    for (int a = 0; a<=100; a = a+20) {
        sprintf(loading,"%d %%",a);
        lcd.printString(loading,18,4);
        wait(0.5);
    }
    lcd.clear();                        //clear screen show another screen
    ticker.attach(&yellow,0.1);         //make yellow light work, lip per 0.1s

    // normal colour mode back
    lcd.normalMode();
    // put LED backlight on 50%
    lcd.setBrightness(0.5);



    calibrateJoystick();  // get centred values of joystick
    pollJoystick.attach(&updateJoystick,1.0/10.0);  // read joystick 10 times per second


    while(1) {


        // can directly print strings at specified co-ordinates
        if(stop == true) {

            if (printFlag) {  // if flag set, clear flag and print joystick values to serial port
                printFlag = 0;

//  use a random variable to change the height of vartical line.
                if ( linex1<0 ) {
                    linex1 = 80; // for first line the strat x-axis is 80
                    liney1 =rand()%48+30;//random value from 30 to 48
                }

                if ( linex2<0 ) {
                    linex2 = 80; // for second line the strat x-axis is 80
                    liney2 =rand()%48+30;//random value from 30 to 48
                }

                if ( linex3<0 ) {
                    linex3 = 80; // for third line the strat x-axis is 80
                    liney3 =rand()%48+20;//random value from 20 to 48
                }

                if ( linex4<0 ) {
                    linex4 = 80; // for fourth line the strat x-axis is 80
                    liney4 =rand()%48+10; //random value from 10 to 48
                }
                if ( linex5<0 ) {
                    linex5 = 81; // for fifth line the strat x-axis is 81
                    liney5 =rand()%48+10; //random value from 10 to 48
                }

// let x variable refuce to make these lines like moving to left
                linex1--;
                linex2--;
                linex3--;
                linex4--;
                linex5--;
                lcd.clear();

// use linex and liney to draw lines
                lcd.drawLine(linex1,liney1,linex1,48,1);  // draw first line
                lcd.drawLine(linex2,liney2,linex2,48,1);  // draw second line
                lcd.drawLine(linex3,liney3,linex3,48,1);  // draw third line
                lcd.drawLine(linex4,liney4,linex4,48,1);  // draw fourth line
                lcd.drawLine(linex5,liney5,linex5,48,1);  // draw fifth line

// check joystick direction
                if (joystick.direction == UP ) {
                    d-=1;                                // let ball move to up
                    char score [14];                     // char score variable
                    sprintf(score,"%d %",s);             // let score show s vaule
                    s++;                                 // s increase 1
                    touch();
                    if (flag) {
                        lcd.clear();                     //clean screen
                        lcd.printString("Game over",5,1);//show game over
                        lcd.printString("Score:",5,4);   //show score on screen
                        lcd.printString(score,45,4);
                        buzzer.period(0.001);            //game over and buzzer work for 0.001 frequency
                        buzzer = 0.5;                    //the volume strong
                        wait(1.0);
                        break;                           //game break
                    }
                    lcd.drawCircle(c,d,4,0);             //draw circle
                }

                if (joystick.direction == DOWN /*&& d > 5*/) {
                    d+=1;                                // let ball move down
                    char score [14];                     // char score variable
                    sprintf(score,"%d %",s);             // let score show s vaule
                    s++;                                 // s increase 1
                    touch();
                    if (flag) {
                        lcd.clear();                     //clean screen
                        lcd.printString("Game over",5,1);//show game over
                        lcd.printString("Score:",5,4);   //show score on screen
                        lcd.printString(score,45,4);
                        buzzer.period(0.001);            //game over and buzzer work for 0.001 frequency
                        buzzer = 0.5;                    //the volume strong
                        wait(1.0);
                        break;                           //game break
                    }
                    lcd.drawCircle(c,d,4,0);             //draw circle
                }

                if (joystick.direction == LEFT ) {
                    c+=1;                                // let ball move to left
                    char score [14];                     // char score variable
                    sprintf(score,"%d %",s);             // let score show s vaule
                    s++;                                 // s increase 1
                    touch();
                    if (flag) {
                        lcd.clear();                     //clean screen
                        lcd.printString("Game over",5,1);//show game over
                        lcd.printString("Score:",5,4);   //show score on screen
                        lcd.printString(score,45,4);
                        buzzer.period(0.001);            //game over and buzzer work for 0.001 frequency
                        buzzer = 0.5;                    //the volume strong
                        wait(1.0);
                        break;                           //game break
                    }
                    lcd.drawCircle(c,d,4,0);             //draw circle
                }

                if (joystick.direction == RIGHT ) {
                    c-=1;                                // let ball move to right
                    char score [14];                     // char score variable
                    sprintf(score,"%d %",s);             // let score show s vaule
                    s++;                                 // s increase 1
                    touch();
                    if (flag) {
                        lcd.clear();                     //clean screen
                        lcd.printString("Game over",5,1);//show game over
                        lcd.printString("Score:",5,4);   //show score on screen
                        lcd.printString(score,45,4);
                        buzzer.period(0.001);            //game over and buzzer work for 0.001 frequency
                        buzzer = 0.5;                    //the volume strong
                        wait(1.0);
                        break;                           //game break
                    }
                    lcd.drawCircle(c,d,4,0);             //draw circle
                }

                if (joystick.direction == CENTRE ) {
                    d+=1;                                // make ball always fall down
                    char score [14];                     // char score variable
                    sprintf(score,"%d %",s);             // let score show s vaule
                    s++;                                 // s increase 1
                    touch();
                    if (flag) {
                        lcd.clear();                     //clean screen
                        lcd.printString("Game over",5,1);//show game over
                        lcd.printString("Score:",5,4);   //show score on screen
                        lcd.printString(score,45,4);
                        buzzer.period(0.001);            //game over and buzzer work for 0.001 frequency
                        buzzer = 0.5;                    //the volume strong
                        wait(1.0);
                        break;                           //game break
                    }
                    lcd.drawCircle(c,d,4,0);             //draw circle
                }

            }
            lcd.refresh();
        } else {
            lcd.clear();
            lcd.printString("Press to play",0,3);        //when game stop to show
            lcd.refresh();
        }
        sleep();
    }
}



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;
}
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;
    } else if ( joystick.y < DIRECTION_TOLERANCE && fabs(joystick.x) < DIRECTION_TOLERANCE) {
        joystick.direction = DOWN;
    } else if ( joystick.x > DIRECTION_TOLERANCE && fabs(joystick.y) < DIRECTION_TOLERANCE) {
        joystick.direction = RIGHT;
    } else if ( joystick.x < DIRECTION_TOLERANCE && fabs(joystick.y) < DIRECTION_TOLERANCE) {
        joystick.direction = LEFT;
    } else {
        joystick.direction = UNKNOWN;
    }

    // set flag for printing
    printFlag = 1;
}

// this function is to judge whether it touch or mot
void touch()
{
// these information is the condition of judgment
    if (lcd.getPixel(c,d+4)||d+4==47||d==-4||lcd.getPixel(-4+c,d)||lcd.getPixel(4+c,d)||lcd.getPixel(c,d-4)||lcd.getPixel(c-1,d-4)||lcd.getPixel(c-2,d-4)||lcd.getPixel(c+1,d-3)) {
// flag = 1 means the conduction is achieved
        flag=1;
    } else {
        flag=0;
    }
}

void yellow() //the function judge yellow lights lip
{
    yellow_led =! yellow_led;
}

void ting() // the function judge tp stop game
{
    stop = !stop;
}