javascript-labyrinth/index.html at master · HomoCodens/javascript-labyrinth · GitHub

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<!doctype html>
<meta charset="utf-8">
<title>Ye olde labyrinthe game</title>

<style>
*
{
  -webkit-user-select: none;
  -moz-user-select: none;
  text-align: center;
}

#timer{white-space: pre; font-family: "Lucida Console",monospace; left: 40px; text-align: normal;}
</style>

<body>
<p id="timer">Step off the plate and you've got 90 seconds...</p>
<canvas width="1000" height="800" style="border: 2px solid black" oncontextmenu="return false;"></canvas>
<p id="gameMessages">Just a sec, the minions are hard at work constructing your doom.</p>

<script src="labyrinthgenerator.js"></script>
<script>
// Generate labyrinth
var nRows = 25;
var nCols = 25;
var labyrinth = labyrinthgenerator(nRows, nCols);

// Initialize array to count number of times the player stepped in each location
var floorTiles = [];
for(var i = 0; i < nRows*nCols; i++)
	floorTiles[i] = 0;
var playerCell = 0;
floorTiles[playerCell] = 1;

// How big to draw the cells
var CELL_SIZE = 21;

// Set up kayboard event listener and keyCodes
window.addEventListener("keydown", keyboardHandler, false);
var UP = 38;
var DOWN = 40;
var RIGHT = 39;
var LEFT = 37;

// Set up HTML5 canvas
var canvas = document.querySelector("canvas");
var drawingSurface = canvas.getContext("2d");
canvas.width = nRows*CELL_SIZE;
canvas.height = nCols*CELL_SIZE;

// Set up paragraph to show game messages
var gameMessages = document.querySelector("#gameMessages");
gameMessages.innerHTML = "Use the arrow keys to escape the <strong>MAZE OF DEATH</strong> <em>Mwahahahaahaaa...</em><br><br>You are green, get to blue.<br>Backtracking  costs you points so watch out.<br>Also, when the time runs out the doors will shut for ever. Toodeloo!";

// Set up timer
var timer = document.querySelector("#timer");
var timeLeft = 90;
var gameRunning = false;

// Draw starting situation
render();

// Handles keyboard input
function keyboardHandler(event)
{
	// Start the game
	if(!gameRunning && event.keyCode >= 37 && event.keyCode <= 40)
	{
		timerTick();
		gameRunning = true;
	}

	// Get player (x, y) position from index
	var playerRow = Math.floor(playerCell/nRows);
	var playerCol = playerCell % nCols;

	// Find out where the player wants to go
	var nextCell = -1;
	switch(event.keyCode)
	{
		case UP:
			if(playerRow > 0)
				nextCell = playerCell - nCols;
			break;
		case DOWN:
			if(playerRow < nRows - 1)
				nextCell = playerCell + nCols;
			break;
		case LEFT:
			if(playerCol > 0)
				nextCell = playerCell - 1;
			break;
		case RIGHT:
			if(playerCol < nCols - 1)
				nextCell = playerCell + 1;
			break
	}

	// If arrow key was pressed and cells playerCell and nextCell are adjacent, move player and update game state
	if(nextCell >= 0 && labyrinth[playerCell][nextCell])
	{
		playerCell = nextCell;
		floorTiles[playerCell] = floorTiles[playerCell] + 1;
		render();
	}

	// If the player is at the bottom right corner he has won
	if(playerCell == nRows*nCols-1)
	{
		window.removeEventListener("keydown", keyboardHandler, false);
		var nSteps = 0;
		var nBacktrack = 0;
		for(var i = 0; i < nRows*nCols; i++)
		{
			nSteps += floorTiles[i] > 0;
			nBacktrack += floorTiles[i];
		}
		nBacktrack = nBacktrack - nSteps;
		gameMessages.innerHTML = "Conga ratz, you made it out this time...<br>It took you " + nSteps + " steps of which " + Math.ceil(1000*nBacktrack/nSteps)/10 + "% were feeble and confused backtracking.";
	}
}

// Handles updating the timer
function timerTick()
{
	// If the player is not at the goal
	if(playerCell != nRows*nCols-1)
	{
		// ... and there is time left
		if(timeLeft)
		{
			// Set up next call of timerTick
			window.setTimeout(function(){timerTick();}, 1000);
			timeLeft--;

			// Update timer display
			var msg = timeLeft + " Seconds left";
			if(timeLeft % 2)
				msg = "<b>TICK!</b>     " + msg + "          ";
			else
				msg = "          " + msg + "     <b>TOCK!</b>";
			timer.innerHTML = msg;
		}
		// Time has run out, end the game
		else
		{
			window.removeEventListener("keydown", keyboardHandler, false);
			gameMessages.innerHTML = "<b><em>WHAM!</em></b>";
		}
	}
}


// Draws the labyrinth walls and heatmap of player steps
function render()
{
	// Draw player position, exit and heatmap
	drawingSurface.clearRect(0, 0, canvas.width, canvas.height);
	for(var cell = 0; cell < nRows*nCols; cell++)
	{
		var cellRow = Math.floor(cell/nRows);
		var cellCol = cell % nCols;
		if(cell == playerCell)
			drawingSurface.fillStyle = "rgba(0, 255, 0, 0.4)";
		else if(cell == nRows*nCols-1)
			drawingSurface.fillStyle = "rgba(0, 0, 255, 0.6)";
		else
			drawingSurface.fillStyle = "rgba(255, 0, 0, " + floorTiles[cell]/10 + ")";
		drawingSurface.fillRect(cellCol*CELL_SIZE, cellRow*CELL_SIZE, CELL_SIZE, CELL_SIZE);
	}

	// Draw walls over heatmap
	drawingSurface.lineWidth = 2;
	for(var cell = 0; cell < nRows*nCols; cell++)
	{
		var cellRow = Math.floor(cell/nRows);
		var cellCol = cell % nCols;
		if(cellRow < nRows - 1)
			if(!labyrinth[cell][cell+nCols])
			{
				drawingSurface.beginPath();
				drawingSurface.moveTo(cellCol*CELL_SIZE, (cellRow+1)*CELL_SIZE);
				drawingSurface.lineTo((cellCol+1)*CELL_SIZE, (cellRow+1)*CELL_SIZE);
				drawingSurface.stroke();
			}
		if(cellCol < nCols - 1)
			if(!labyrinth[cell][cell+1])
			{
				drawingSurface.beginPath();
				drawingSurface.moveTo((cellCol+1)*CELL_SIZE, cellRow*CELL_SIZE);
				drawingSurface.lineTo((cellCol+1)*CELL_SIZE, (cellRow+1)*CELL_SIZE);
				drawingSurface.stroke();
			}
	}
}

</script>
</body>