//Constants

var SPEED = 3,

SIZE = 21,

COLS = floor(width/SIZE),

ROWS = floor(height/SIZE-1),

WEST = 1,

NORTH = 2,

EAST = 4,

SOUTH = 8,

PELLET = 16,

POWERUP = 32,

PELLET_POINTS = 10,

ENEMIES = 4;

//Variables

var g = {isDone:true,score:0};

var p = {x:0,y:0,d:EAST,n:EAST}; //Player

var e = []; //Enemies

var m; //Maze

//Functions

var canMove = function(m,p,d){

var c,r;

c=floor(p.x/SIZE);

r=floor(p.y/SIZE);

switch(d){

case WEST:

c+=p.x%SIZE?1:0;

if(p.y%SIZEm[r][c]&WEST){return false;}

break;

case NORTH:

r+=p.y%SIZE?1:0;

if(p.x%SIZEm[r][c]&NORTH){return false;}

break;

case EAST:

if(p.y%SIZEm[r][c]&EAST){return false;}

break;

case SOUTH:

if(p.x%SIZEm[r][c]&SOUTH){return false;}

break;

}

return true;

};

var keyPressed = function(){

var d = pow(2,keyCode-37);

if(canMove(m,p,d)){

p.d=d;

}

p.n=d;

};

var getGrid=function(){

var a=[],r,c;

for(r=0;r<ROWS;r++){

a.push([]);

for(c=0;c<COLS;c++){

a[r].push(31);

}

}

return a;

};

var generateMaze=function(){

var s = [{r:0,c:0}], r,c,u,d;

while(s.length){

r=s[s.length-1].r;

c=s[s.length-1].c;

u=[];

if(c>0 && m[r][c-1]%16===15){u.push(WEST);}

if(r>0 && m[r-1][c]%16===15){u.push(NORTH);}

if(c<COLS-1 && m[r][c+1]%16===15){u.push(EAST);}

if(r<ROWS-1 && m[r+1][c]%16===15){u.push(SOUTH);}

if(u.length){

d=u[round(random(u.length-1))];

switch(d){

case WEST:

m[r][c] -= WEST;

m[r][c-1] -= EAST;

s.push({r:r,c:c-1});

break;

case NORTH:

m[r][c] -= NORTH;

m[r-1][c] -= SOUTH;

s.push({r:r-1,c:c});

break;

case EAST:

m[r][c] -= EAST;

m[r][c+1] -= WEST;

s.push({r:r,c:c+1});

break;

case SOUTH:

m[r][c] -= SOUTH;

m[r+1][c] -= NORTH;

s.push({r:r+1,c:c});

break;

}

}

else{

s.pop();

}

}

};

var generateEnemies = function(e){

for(var i=0;i<ENEMIES;i++){

e.push({

x:floor(random(COLS))*SIZE,

y:floor(random(ROWS))*SIZE,

d:pow(2,round(random(3)))

});

}

};

var drawMaze=function(){

text(g.score,0,395);

var r,c;

for(r=0;r<ROWS;r++){

for(c=0;c<COLS;c++){

if(m[r][c]&PELLET){

stroke(255);

strokeWeight(3);

point(c*SIZE+(SIZE+1)/2,r*SIZE+(SIZE+1)/2);

}

stroke(0,255,0);

strokeWeight(1);

if(m[r][c]&WEST){

line(c*SIZE,r*SIZE,

c*SIZE,(r+1)*SIZE);

}

if(m[r][c]&NORTH){

line(c*SIZE,r*SIZE,

(c+1)*SIZE,r*SIZE);

}

if(m[r][c]&EAST){

line((c+1)*SIZE,r*SIZE,

(c+1)*SIZE,(r+1)*SIZE);

}

if(m[r][c]&SOUTH){

line(c*SIZE,(r+1)*SIZE,

(c+1)*SIZE,(r+1)*SIZE);

}

}

}

};

var movePlayer = function(m,p){

var c,r;

if(canMove(m,p,p.n)){

p.d=p.n;

}

if(!canMove(m,p,p.d)){

return;

}

switch(p.d){

case WEST:

p.x-=SPEED;

break;

case NORTH:

p.y-=SPEED;

break;

case EAST:

p.x+=SPEED;

break;

case SOUTH:

p.y+=SPEED;

break;

}

c=floor(p.x/SIZE);

r=floor(p.y/SIZE);

if(p.x%SIZE===0&&p.y%SIZE===0&&m[r][c]&PELLET){

g.score+=PELLET_POINTS;

m[r][c]-=PELLET;

}

};

var drawPlayer = function(p){

var theta;

switch(p.d){

case WEST:

theta=180;

break;

case NORTH:

theta=270;

break;

case EAST:

theta=0;

break;

case SOUTH:

theta=90;

break;

}

fill(255, 255, 0);

noStroke();

arc(p.x+(SIZE+1)/2+1,p.y+(SIZE+1)/2+1,SIZE-4,SIZE-4,

theta+sin(frameCount%9*40)*45,

theta+360-sin(frameCount%9*40)*45);

};

var moveEnemies = function(m,e){

var d;

for (var i=0;i<e.length;i++){

if(e[i].x%SIZE===0&&e[i].y%SIZE===0){

d = pow(2,(log(e[i].d)/log(2)+3)%4);

while(!canMove(m,e[i],d)){

d = pow(2,(log(d)/log(2)+1)%4);

}

e[i].d=d;

}

switch(e[i].d){

case WEST:

e[i].x-=SPEED;

break;

case NORTH:

e[i].y-=SPEED;

break;

case EAST:

e[i].x+=SPEED;

break;

case SOUTH:

e[i].y+=SPEED;

break;

}

}

};

var drawEnemies = function(e){

fill(255, 0, 0);

for (var i=0;i<e.length;i++){

ellipse(e[i].x+(SIZE+1)/2+1,e[i].y+(SIZE+1)/2+1,

SIZE-4,SIZE-4);

}

};

m = getGrid();

generateMaze();

generateEnemies(e);

var draw=function() {

movePlayer(m,p);

moveEnemies(m,e);

background(0);

drawMaze();

drawPlayer(p);

drawEnemies(e);

};

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