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Added comments.
ExpressHermes Jan 6, 2019
89c5b52
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ExpressHermes Jan 17, 2019
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164 changes: 98 additions & 66 deletions src/snakes.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -202,11 +202,11 @@ std::string sha256(std::string input)
return std::string(buf);
}

void exitnow()
void exitnow() //to exit the game
{
std::cout<<"Game Over!\nScore: "<<score<<std::endl;

if (score>scoreold)
if (score>scoreold)// if current score grater than last high score
{
std::cout<<"You have got a new high score!"<<std::endl;
std::ofstream fout;
Expand All @@ -220,92 +220,119 @@ void exitnow()
exit(0);
}

void setDir(char a)
void setDir(char a) //to set direction
{
if (a=='a' && dir!=2)
if (a=='a' && dir!=2) //when 'a' is pressed and snake is not moving towards right
dir=1; //left
if (a=='d' && dir!=1)
if (a=='d' && dir!=1) //when 'd' is pressed and snake is not moving towards left
dir=2; //right
if (a=='w' && dir!=4)
if (a=='w' && dir!=4) //when 'w' is pressed and snake is not moving in the back(bottom) direction
dir=3; //front
if (a=='s' && dir!=3)
if (a=='s' && dir!=3) //when 's' is pressed and direction is not moving in the front(up) direction
dir=4; //back
}

void setPos()
void setPos() //to set postion when direction keys are pressed
{

if (dir==1)
if (dir==1) //left
{
for (int i=len-1;i>0;i--)
for (int i=len-1;i>0;i--)//moving x-coordinate of snake towards left
arrx[i]=arrx[i-1];
for (int i=len-1;i>0;i--)
for (int i=len-1;i>0;i--)//moving y-coordinate of snake towards left
arry[i]=arry[i-1];
arrx[0]-=1;
if (arrx[0]<0) arrx[0]=799;
}
if (dir==2)
if(arrx[0]<14) exitnow();//terminate game if snake touches the wall

if(arrx[0]<500 && arrx[0]>300)
{
if((arry[0]>250&&arry[0]<265) ||(arry[0]>335 && arry[0]<350)) exitnow();}
}
if (dir==2) //right
{
for (int i=len-1;i>0;i--)
for (int i=len-1;i>0;i--)//moving x-coordinate of snake towards right
arrx[i]=arrx[i-1];
for (int i=len-1;i>0;i--)
for (int i=len-1;i>0;i--)//moving y-coordinate of snake towards right
arry[i]=arry[i-1];
arrx[0]+=1;
if (arrx[0]>799) arrx[0]=0;
}
if (dir==3)
if (arrx[0]>786) exitnow();//terminate game if snake touches the wall
if(arrx[0]<500&& arrx[0]>300)
{
if((arry[0]>250&&arry[0]<265) ||(arry[0]>335 && arry[0]<350)) exitnow(); }
}
if (dir==3) //front(up)
{
for (int i=len-1;i>0;i--)
for (int i=len-1;i>0;i--)//moving x-coordinate of snake towards front(up)
arry[i]=arry[i-1];
for (int i=len-1;i>0;i--)
for (int i=len-1;i>0;i--)//moving y-coordinate of snake towards front(up)
arrx[i]=arrx[i-1];
arry[0]-=1;
if (arry[0]<0) arry[0]=599;
if (arry[0]<14) exitnow();//terminate game if snake touches the wall

if((arry[0]>=250&&arry[0]<=265) ||(arry[0]<350 && arry[0]>335))
{
if(arrx[0]<500&& arrx[0]>300) exitnow();
}
}
if (dir==4)
if (dir==4) //down(bottom)
{
for (int i=len-1;i>0;i--)
for (int i=len-1;i>0;i--)//moving x-coordinate of snake towards down(bottom)
arry[i]=arry[i-1];
for (int i=len-1;i>0;i--)
for (int i=len-1;i>0;i--)//moving y-coordinate of snake towards down(bottom)
arrx[i]=arrx[i-1];
arry[0]+=1;
if (arry[0]>599) arry[0]=0;
if (arry[0]>586) exitnow();//terminate game if snake touches the wall
if((arry[0]>250&&arry[0]<265) ||(arry[0]<350 && arry[0]>335))
{
if(arrx[0]<500&& arrx[0]>300) exitnow();
}
}
}

void giveFood()
void giveFood()//to generate food
{
if (fc==1)
{
srand(::count);
fx=50+rand()%700;fy=50+rand()%500;
do
{
srand(::count);
fx=50+rand()%700;fy=50+rand()%500;//random postion for food b/w 50 to 750 horizontal pixels and 50 to 550 vertical pixels
}while((fx>300&&fx<500)&&(fy>250&&fy<265));//to regenerate food's coordinate if they are on the mid-walls
fc=0;
}
for (int i=fx-(12-level);i<=fx+(12-level);i++)
for (int j=fy-(12-level);j<=fy+(12-level);j++)
img.at<uchar>(j, i) =200;
for (int i=fx-(12-level);i<=fx+(12-level);i++)//determining food's size according to the level(larger for low level and vice versa)
for (int j=fy-(12-level);j<=fy+(12-level);j++)//used 12 to make sure food is visble in the last level(10)
img.at<uchar>(j, i) =200;//food's pixel colour(200) lighter than the snake(255)
::count++;
}

void sprint()
void sprint()//to print the map and snake
{
for (int i=0;i<img.rows;i++)
for (int i=0;i<img.rows;i++)//to print map with walls
for (int j=0; j<img.cols;j++)
img.at<uchar>(i, j) = 0;
for (int i=0;i<len;i++)
if((j<=14)||(j>=img.cols-15)||(i<=14)||(i>=img.rows-15))//to print the bounday wall
img.at<uchar>(i,j) = 200;
else if(j>=300&&j<=500&&i>=img.rows/2-50&&i<=img.rows/2-35)//to print the upper mid-wall
img.at<uchar>(i,j) = 200;
else if(j>=300&&j<=500&&i>=img.rows/2+35&&i<=img.rows/2+50)//to print the lower mid wall
img.at<uchar>(i,j) = 200;
else
img.at<uchar>(i, j) = 0;//to print map except wall

for (int i=0;i<len;i++)//loop to print snake
{
int x=arrx[i],y=arry[i];
img.at<uchar>(y, x) = 255;
img.at<uchar>(y, x) = 255;//setting snake's pixel to white
}
}

void incLen()
void incLen()// to increase length
{
int xd=arrx[len-2]-arrx[len-1];
int yd=arry[len-2]-arry[len-1];
int xd=arrx[len-2]-arrx[len-1];// determining the change in length
int yd=arry[len-2]-arry[len-1];// determining the change in width
arrx=(int*)realloc(arrx,(len+leninc)*sizeof(int));
arry=(int*)realloc(arry,(len+leninc)*sizeof(int));
if (xd>0)
if (xd>0)//to increase the length by 1 pixel when snake is moving towards left
{
for (int i=len;i<len+leninc;i++)
{
Expand All @@ -315,7 +342,7 @@ void incLen()
for (int i=len;i<len+leninc;i++)
arry[i]=arry[i-1];
}
if (xd<0)
if (xd<0)//to increase the length by 1 pixel when snake is moving towards right
{
for (int i=len;i<len+leninc;i++)
{
Expand All @@ -325,7 +352,7 @@ void incLen()
for (int i=len;i<len+leninc;i++)
arry[i]=arry[i-1];
}
if (yd>0)
if (yd>0)//to increase the length by 1 pixel when snake is moving upwards
{
for (int i=len;i<len+leninc;i++)
{
Expand All @@ -335,7 +362,7 @@ void incLen()
for (int i=len;i<len+leninc;i++)
arrx[i]=arrx[i-1];
}
if (yd<0)
if (yd<0)//to increase the length by 1 pixel when snake is moving downwards
{
for (int i=len;i<len+leninc;i++)
{
Expand All @@ -349,31 +376,33 @@ void incLen()
slim=0;
}

void checkFood()
void checkFood()// eating food and generaing bonus
{
int flag=0, k;
for (int i=fx-(12-level);i<=fx+(12-level);i++)
for (int j=fy-(12-level);j<=fy+(12-level);j++)
for(k=0;k<len;k++)
if (arrx[k]==i && arry[k]==j)
if (arrx[k]==i && arry[k]==j)// check if snake's and food's coordinate are same
{flag=1; break;}
if (flag==1)
{incLen(); score++; if (score%4==0) {showbonus=1;bc=1;} fc=1;}
{
incLen(); score++; //increase length and score
if (score%4==0) {showbonus=1;bc=1;} fc=1;}// print bonus when score is divisible by 4
}

void gameOver()
void gameOver()// to exit game
{
int lennow=len;
if (slim>10)
lennow-=5;
int x=arrx[0],y=arry[0];
for (int i=1;i<lennow;i++)
if (arrx[i]==x && arry[i]==y)
exitnow();
if (arrx[i]==x && arry[i]==y)//if snakes's head touches any part of its body
exitnow();// game terminates
}
void a(int value, void*)
{
printf("Level set to: %2d\n",value);
printf("Level set to: %2d\n",value);//to print the level on which game is being played
if (value<oldvalue)
{
arrx=(int*)realloc(arrx,(len-leninc)*sizeof(int));
Expand All @@ -385,31 +414,34 @@ void a(int value, void*)
oldvalue=value;
}

void printBonus()
void printBonus() // to print bonus
{
if (bc==1)
{bx=50+rand()%700;by=50+rand()%500;}
{bx=50+rand()%700;by=50+rand()%500;} //genrating random position for bonus
if ((bc/10)%2==0)
for (int i=bx-6;i<=bx+6;i++)
for (int j=by-6;j<=by+6;j++)
img.at<uchar>(j, i) =200;
for (int i=bx-6;i<=bx+6;i++) // bx: x-cordinate of bonus
for (int j=by-6;j<=by+6;j++) // by: y-cordinate of bonus
img.at<uchar>(j, i) =200;// printing bonus
bc++;
}

void checkBonus()
void checkBonus()//to eat bonus
{
int flag=0, k;
for (int i=bx-6;i<=bx+6;i++)
for (int j=by-6;j<=by+6;j++)
for (k=0;k<len;k++)
if (arrx[k]==i && arry[k]==j)
if (arrx[k]==i && arry[k]==j)// if snake's and bonus' coordinte are same
{flag=1; break;}
if (flag==1)
{incLen(); incLen();score+=2; if (score%4==0) {showbonus=1;bc=1;} showbonus=0; bc=0;}
{incLen(); incLen();// increase length by two
score+=2; // increase score by two
if (score%4==0) //if score divisible by 4
{showbonus=1;bc=1;} showbonus=0; bc=0;}
if (bc>80) {showbonus=0;bc=0;}
}

void itoa(int num, char ch[])
void itoa(int num, char ch[])// converting integer to alphabets
{
if (num==0) {ch[0]='0'; ch[1]='\0'; return;}
int c=0;
Expand Down Expand Up @@ -455,8 +487,8 @@ int main()
arrx[i]=posx-i;
arry[i]=posy;
}
img = cv::Mat::zeros(600,800, CV_8U);
cv::namedWindow("Snakes",1);
img = cv::Mat::zeros(600,800, CV_8U); // creating the map
cv::namedWindow("Snakes",1);// creating display window
cv::createTrackbar( "Level: ", "Snakes", &level, 10,a);
while(1)
{
Expand All @@ -465,11 +497,11 @@ int main()
slim++;
char ch='d';
ch=cv::waitKey((101-level*10));
if (ch=='p') score++;
if (ch=='\n') exitnow();
if (ch==' ') fc=1;
if (ch=='p') score++; // if p is pressed increase score by 1
if (ch=='\n') exitnow(); // enter key for instant exit
if (ch==' ') fc=1;// space key for producing food at different location
setDir(ch);
for (int i=1; i<=8+(1.5*level);i++)
for (int i=1; i<=8+(1.5*level);i++)//loop to decide speed depending on level
setPos();
gameOver();
sprint();
Expand Down