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createMaze.js
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createMaze.js
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var _SEQ=0;
var randomNumber=function(max) {
return Math.floor(Math.random()*max);
}
var randomDirection=function() {
return ["north","south","east","west"][randomNumber(4)];
}
var sumOfCoordinates=function(c1,c2) {
return [c1[0]+c2[0], c1[1]+c2[1]];
}
var createGrid=function(rows,cols,character) {
var grid=[];
for (var i = 0; i < rows; i++) {
grid.push([]);
for (var j = 0; j < cols; j++) {
grid[i][j]=character;
}
}
return grid;
}
var printGrid=function(grid,rows,cols) {
var str="";
for (var i = 0; i < rows; i++) {
for (var j = 0; j < cols; j++) {
str+=grid[i][j];
}
str+="\n";
}
console.log(str);
}
var north=[-1,0];
var south=[1,0];
var east=[0,1];
var west=[0,-1];
var directions={
north: {val: north, left: west, right: east, leftOf: "west", rightOf: "east"},
south: {val: south, left: east, right: west, leftOf: "east", rightOf: "west"},
east: {val: east, left: south, right: north, leftOf: "south", rightOf: "north"},
west: {val: west, left: north, right: south, leftOf: "north", rightOf: "south"}
};
var outOfBounds=function(coord,mx,my) {
var x=coord[0];
var y=coord[1];
return (x<1 || y<1 || x>=(mx-1) || y>=(my-1));
}
var isCoordMazeChar=function(grid,coord) {
return grid[coord[0]][coord[1]]==MAZE_CHAR;
}
var pathBlocked=function(grid,coord,direction) {
var left=sumOfCoordinates(coord,directions[direction].left);
var right=sumOfCoordinates(coord,directions[direction].right);
var inFront=sumOfCoordinates(coord,directions[direction].val);
return (!outOfBounds(left,MAX_ROWS,MAX_COLS) && isCoordMazeChar(grid,left))
|| (!outOfBounds(right,MAX_ROWS,MAX_COLS) && isCoordMazeChar(grid,right))
|| (!outOfBounds(inFront,MAX_ROWS,MAX_COLS) && isCoordMazeChar(grid,inFront));
}
var turnRandomly=function(direction) {
var shouldTurn=Math.random();
if(shouldTurn<0.2)
return direction;
var leftOrRight=Math.random();
if(leftOrRight>0.5)
return directions[direction].leftOf;
return directions[direction].rightOf;
}
var createMazePath=function(grid,coord,direction) {
var row=coord[0];
var col=coord[1];
if(outOfBounds(coord,MAX_ROWS,MAX_COLS))
return grid;
if(grid[row][col]==MAZE_CHAR)
return grid;
if(pathBlocked(grid,coord,direction))
return grid;
grid[row][col]=MAZE_CHAR;
direction=turnRandomly(direction);
var inFrontOf=sumOfCoordinates(coord,directions[direction].val);
var leftOf=sumOfCoordinates(coord,directions[direction].left);
var right=directions[direction].rightOf;
var rightOf=sumOfCoordinates(coord,directions[direction].right);
var behind=sumOfCoordinates(coord,directions[right].right);
grid=createMazePath(grid,inFrontOf,direction);
grid=createMazePath(grid,leftOf,directions[direction].leftOf);
grid=createMazePath(grid,rightOf,directions[direction].rightOf);
grid=createMazePath(grid,behind,directions[right].rightOf);
return grid;
}
var createMaze=function(grid,initCoord,initDir) {
var grid=createMazePath(grid,initCoord,initDir);
var startingRows=[];
var endingRows=[];
for (var i = 0; i < grid.length; i++) {
if(grid[i][1]==MAZE_CHAR)
startingRows.push(i);
if(grid[i][MAX_COLS-2]==MAZE_CHAR)
endingRows.push(i);
}
var startRow=randomNumber(startingRows.length);
grid[startingRows[startRow]][0]=MAZE_CHAR;
var endRow=randomNumber(endingRows.length)
var randomEndingRow=grid[endingRows[endRow]];
randomEndingRow.pop();
randomEndingRow.push(MAZE_CHAR);
return {grid: grid, start: [startingRows[startRow],0], end: [endingRows[endRow],MAX_COLS-1]};
}
var MAX_ROWS=90;
var MAX_COLS=90;
var MAIN_CHAR="-";
var MAZE_CHAR="X";
var drawChart=function(maze) {
d3.select(".maze").selectAll("tr").remove();
var rows=d3.select(".maze")
.selectAll("tr")
.data(maze.grid);
rows.enter()
.append("tr")
.selectAll("td")
.data(function(d){return d})
.enter()
.append("td")
.attr("class",function(d,i){
return d==MAZE_CHAR?"path":"empty";
});
}
var drawCell=function(r,c,cl,finished) {
_SEQ+=1;
setTimeout(function(){
var rows=d3.select(".maze").selectAll("tr")._groups[0];
rows[r].childNodes[c].className=cl;
if(finished)
drawNewMaze();
},_SEQ*5);
}
var isSameCoord=function(c1,c2) {
return (c1[0]==c2[0])&&(c1[1]==c2[1]);
}
var solveMaze=function(grid,start,stop,solution) {
for (var i = 0; i < solution.length; i++) {
if(isSameCoord(solution[i],start))
return undefined;
}
if(isSameCoord(start,stop)) {
solution.push(stop);
drawCell(stop[0],stop[1],"solution",true);
return solution;
}
var r=start[0];
var c=start[1];
if(r<0 || c<0 || r>=MAX_ROWS || c>=MAX_COLS)
return undefined;
if(grid[r][c]!= MAZE_CHAR)
return undefined;
solution.push(start);
drawCell(r,c,"solution");
if(solveMaze(grid,[r+1,c],stop,solution))
return solution;
if(solveMaze(grid,[r,c+1],stop,solution))
return solution;
if(solveMaze(grid,[r-1,c],stop,solution))
return solution;
if(solveMaze(grid,[r,c-1],stop,solution))
return solution;
solution.pop();
drawCell(r,c,"path");
return undefined;
}
var solve=function(maze) {
return solveMaze(maze.grid,maze.start,maze.end,[],0);
}
var drawNewMaze=function() {
setTimeout(function(){
_SEQ=0;
var mainGrid=createGrid(MAX_ROWS,MAX_COLS,MAIN_CHAR);
var initCoord=[randomNumber(MAX_ROWS-2)+1,randomNumber(MAX_COLS-2)+1];
var initDirection=randomDirection();
var mainMaze=createMaze(mainGrid,initCoord,initDirection);
drawChart(mainMaze);
solve(mainMaze);
},2000);
}
drawNewMaze();