//determines whether the ball touches the brick
//and takes the necessary action
void whetherBallTouchesBrick(){
for(int i=0;i<20;i++){
for(int j=0;j<8;j++){
if(isBrick[i][j]==1&&b.cy<240){
int touchCx=abs(b.cx+5);
int touchCy=abs(b.cy+5);
int brickLeft=i*brickLen;
int brickRight=brickLeft+brickLen;
int brickUp=j*brickBred;
int brickDown=brickUp+brickBred;
if((touchCx==brickRight)&&(abs(b.upy-brickUp)<=abs(brickBred-b.radius)&&abs(b.downy-brickDown)<=abs(brickBred-b.radius))){
touchLeft();
isBrick[i][j]=0;
}
else if((touchCx==brickLeft)&&(abs(b.upy-brickUp)<=abs(brickBred-b.radius)&&abs(b.downy-brickDown)<=abs(brickBred-b.radius))){
touchRight();
isBrick[i][j]=0;
}
else if((touchCy==brickDown)&&(abs(b.leftx-brickLeft)<=abs(brickLen-b.radius)&&abs(b.rightx-brickRight)<=abs(brickLen-b.radius))){
touchUp();
isBrick[i][j]=0;
}
else if((touchCy==brickUp)&&(abs(b.leftx-brickLeft)<=abs(brickLen-b.radius)&&abs(b.rightx-brickRight)<=abs(brickLen-b.radius))){
touchDown();
isBrick[i][j]=0;
}
else if((abs(abs(b.cx)-brickLeft)+abs(abs(b.cx)-brickRight)==brickLen)&&(abs(abs(b.cy)-brickUp)+abs(abs(b.cy)-brickDown)==brickBred)){
touchCorner();
isBrick[i][j]=0;
}
if(isBrick[i][j]==0){
score=score+(10*abs(j-8));
setScoreString();
int brick[8];
setcolor(0);
brick[0]=brick[6]=brickLeft;
brick[1]=brick[3]=brickUp;
brick[2]=brick[4]=brickRight;
brick[5]=brick[7]=brickDown;
setfillstyle(1,0);
fillpoly(4,brick);
rectangle(brick[0],brick[1],brick[2],brick[5]);
drawBricks();
i=0,j=0;
}
}
}
}
}
// This function does boundary checking on the ball, also determines where
// it hits the paddle, and changes the behavior of the ball depending.
void checkBallCollisions(int paddlePos)
{
// first check for any brick collisions
char detected = drawBricks(&ball);
// if no bricks hit, continue with normal collision detection
if(detected == 'n')
{
// right wall
if(ball.x >= SCREEN_WIDTH - BALL_RADIUS)
{
ball.x = SCREEN_WIDTH - (BALL_RADIUS + 1);
xdir = -xdir;
playTone(500, 50);
return;
}
// left wall
if(ball.x <= BALL_RADIUS)
{
ball.x = BALL_RADIUS + 1;
xdir = -xdir;
playTone(500, 50);
return;
}
// ceiling
if(ball.y >= SCREEN_HEIGHT - BALL_RADIUS)
{
ydir = -1.0;
playTone(500, 50);
return;
}
// middle of paddle
if(ball.y <= 19 && (ball.x <= paddlePos + (PADDLE_WIDTH / 2) + (BALL_RADIUS + 1) &&
ball.x >= paddlePos + (PADDLE_WIDTH / 2) - (BALL_RADIUS + 1)))
{
paddleHits++;
// increase ball speed slightly with every 6 paddle hits
if((paddleHits % 18 == 0) && (paddleHits <= 36))
speed += 1.0;
ball.y = 20;
ydir = 1.0;
playTone(500,50);
return;
}
// right side of paddle
else if(ball.y <= 19 && ((ball.x <= paddlePos + PADDLE_WIDTH) &&
(ball.x > paddlePos + (PADDLE_WIDTH / 2) + (BALL_RADIUS + 1))))
{
paddleHits++;
// increase ball speed slightly with every 6 paddle hits
if((paddleHits % 18 == 0) && (paddleHits <= 36))
speed += 1.0;
ball.y = 20;
ydir = 1.0;
xdir += 1.0;
playTone(500, 50);
return;
}
// left side of paddle
else if(ball.y <= 19 && ((ball.x >= paddlePos) &&
(ball.x < paddlePos + (PADDLE_WIDTH / 2) - (BALL_RADIUS + 1))))
{
paddleHits++;
// increase ball speed slightly with every 6 paddle hits
if((paddleHits % 18 == 0) && (paddleHits <= 36))
speed += 1.0;
ball.y = 20;
ydir = 1.0;
xdir -= 1.0;
playTone(500, 50);
return;
}
// ball hits floor, lives lost, score deducted
if(ball.y <= 10 && ((ball.x < paddlePos) || (ball.x > paddlePos + PADDLE_WIDTH)))
{
playTone(50,500);
tft.fillCircle(ball.y, ball.x, BALL_RADIUS, ST7735_BLACK);
drawPaddle();
initializeBall(getDifficulty());
decreaseLives();
displayStats();
delay(20);
}
}
// brick collision detected, adjust ball accordingly
else
{
// corner of brick hit
if(detected == 'c')
{
xdir = -xdir;
ydir = -ydir;
playTone(200,50);
return;
}
else
{
// left/right side of brick hit
if(detected == 'x')
{
xdir = -xdir;
playTone(200,50);
return;
}
// top/bottom of brick hit
else if(detected == 'y')
{
ydir = -ydir;
playTone(200,50);
return;
}
}
}
}
//function which centrally controls the execution of game
void gameHandler(){
settextstyle(0,0,6);
outtextxy(180,200,"DX-Ball");
getch();
clearviewport();
brickLen=25,brickBred=15;
for(int i=0;i<20;i++)
for(int j=0;j<8;j++)
isBrick[i][j]=1;
drawBricks();
b.cx=20;
b.cy=240;
b.xIncre=1;
b.yIncre=1;
b.radius=5;
br.size=80;
br.movement=10;
score=0;
livesRemain[0]=' ';
livesRemain[1]=' ';
strcat(livesRemain,"live(s) remaining.");
b.lives=3;
line(500,0,500,480);
settextstyle(0,0,2);
outtextxy(535,200,"Score:");
settextstyle(0,0,2);
setScoreString();
outtextxy(535,230,scoreString);
outtextxy(535,320,"Lives:");
setLivesString();
outtextxy(565,350,livesString);
b.ulimit=0;
b.llimit=0;
b.rlimit=500;
br.llimit=0;
br.rlimit=500;
br.rePositionBar(0);
br.drawBar();
int ch='a';
while(1){
while(!kbhit()){
delay(4);
b.removePreviousBall();
changeScore();
initializeVariables();
whetherBallTouchesBrick();
b.drawBall();
br.removePreviousBar();
br.drawBar();
line(500,0,500,480);
}
ch=getch();
if(ch=='a'){
br.removePreviousBar();
br.rePositionBar('a');
br.drawBar();
}
if(ch=='s'){
br.removePreviousBar();
br.rePositionBar('s');
br.drawBar();
}
if(ch=='p')
ch=getch();
if(ch=='q'){
displayAbout();
getch();
exit(0);
}
}
}
int playLevel(int levelNo, int pause) {
lcdClear();
lcdFill(GLOBAL(nickbg));
// load level
int bricks[FIELD_HEIGHT][FIELD_WIDTH];
memcpy(bricks, levels[levelNo], sizeof(bricks));
// initialisation
int ball[2] = {SCREEN_WIDTH / 2, FIELD_HEIGHT * (BRICK_HEIGHT + BRICK_SPACING) + 1};
int direction[2] = {1,1};
int paddleX = SCREEN_WIDTH / 2 - PADDLE_WIDTH / 2;
int lives = LIVES_INITIAL;
drawBricks(bricks);
while ( 1 ) {
// ball
drawBall(ball, GLOBAL(nickbg));
ball[0] += direction[0];
ball[1] += direction[1];
// paddle / user input
drawPaddle(paddleX, GLOBAL(nickbg));
int key = getInputRaw();
switch (key) {
case BTN_ENTER:
// exit
return 0;
case BTN_LEFT:
paddleX -= PADDLE_SPEED;
if (paddleX < 0)
paddleX = 0;
break;
case BTN_RIGHT:
paddleX += PADDLE_SPEED;
if (paddleX + PADDLE_WIDTH > SCREEN_WIDTH)
paddleX = SCREEN_WIDTH - PADDLE_WIDTH;
break;
}
drawPaddle(paddleX, GLOBAL(nickfg));
// collisions
// bricks
int x = ball[0] / ((BRICK_WIDTH + BRICK_SPACING));
int y = ball[1] / ((BRICK_HEIGHT + BRICK_SPACING));
if (0 <= x && x < FIELD_WIDTH && 0 <= y && y < FIELD_HEIGHT) {
if (bricks[y][x] == 1) {
// collision with brick
int xRel = ball[0] - x * (BRICK_WIDTH + BRICK_SPACING);
int yRel = ball[1] - y * (BRICK_HEIGHT + BRICK_SPACING);
if (xRel == 0 || xRel == BRICK_WIDTH)
direction[0] *= -1; // hit top or bottom
if (yRel == 0 || yRel == BRICK_HEIGHT)
direction[1] *= -1; // hit left or right
bricks[y][x] = 0;
if (fieldIsCleared(bricks))
return 1; // next level
}
}
// paddle / bottom
if (direction[1] > 0) {
// moving to the bottom
if (ball[1] >= PADDLE_Y) {
if (paddleX <= ball[0] && ball[0] <= paddleX + PADDLE_WIDTH) {
// collision with paddle
direction[1] = - abs(direction[1]);
if (key == BTN_LEFT)
direction[0] = -2;
else if (key == BTN_RIGHT)
direction[0] = 2;
else
direction[0] = (direction[0] > 0) ? 1 : -1;
}
else {
// ball lost
lives--;
if (lives == 0) {
lcdClear();
lcdPrintln("");
lcdPrintln("");
lcdPrintln("");
lcdPrintln("");
lcdPrintln(" GAME OVER");
lcdDisplay();
delayms(2000);
return 0;
}
ball[0] = SCREEN_WIDTH / 2;
ball[1] = FIELD_HEIGHT * (BRICK_HEIGHT + BRICK_SPACING) + 1;
direction[0] = (paddleX + PADDLE_WIDTH / 2 < ball[0]) ? -1 : 1;
direction[1] = 1;
}
}
}
// walls
if (ball[1] <= 0)
direction[1] = abs(direction[1]);
if (ball[0] <= 0)
direction[0] = abs(direction[0]);
else if (ball[0] >= SCREEN_WIDTH - 1)
direction[0] = - abs(direction[0]);
drawBricks(bricks);
drawBall(ball, GLOBAL(nickfg));
lcdDisplay();
delayms(pause);
}
return 0;
}
