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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Snakenlichten</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<script src="https://d3js.org/d3.v4.min.js"></script>
</head>
<body>
<div id="controls">
<div class="alert alert-warning">Basic arrow key support but not great for situations like "change from E to NW"</div>
<div class="btn-group btn-group-justified">
<a id="direction-NW" class="btn btn-default" onclick="changeDirection('NW');">NW</a>
<a class="btn btn-default" disabled>N</a>
<a id="direction-NE" class="btn btn-default" onclick="changeDirection('NE');">NE</a>
</div>
<div class="btn-group btn-group-justified">
<a id="direction-W" class="btn btn-default" onclick="changeDirection('W');">W</a>
<a class="btn btn-default" disabled></a>
<a id="direction-E" class="btn btn-default" onclick="changeDirection('E');">E</a>
</div>
<div class="btn-group btn-group-justified">
<a id="direction-SW" class="btn btn-default" onclick="changeDirection('SW');">SW</a>
<a class="btn btn-default" disabled>S</a>
<a id="direction-SE" class="btn btn-default" onclick="changeDirection('SE');">SE</a>
</div>
</div>
<script>
var width = 1000, height = 1000;
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(100,500) scale(1,-1)");
var board = {
cells: {},
edgeLength: 13,
cellSize: 30,
getNextCoordinates: function(boardX,boardY,direction) {
switch (direction) {
case "E":
return board.getNextRight(boardX,boardY);
break;
case "W":
return board.getNextLeft(boardX,boardY);
break;
case "NE":
if (boardX % 2 == boardY % 2) {
return board.getNextRight(boardX,boardY);
} else {
return board.getNextUp(boardX,boardY);
}
break;
case "NW":
if (boardX % 2 == boardY % 2) {
return board.getNextLeft(boardX,boardY);
} else {
return board.getNextUp(boardX,boardY);
}
break;
case "SE":
if (boardX % 2 == boardY % 2) {
return board.getNextDown(boardX,boardY);
} else {
return board.getNextRight(boardX,boardY);
}
break;
case "SW":
if (boardX % 2 == boardY % 2) {
return board.getNextDown(boardX,boardY);
} else {
return board.getNextLeft(boardX,boardY);
}
break;
}
},
getNextRight: function(boardX,boardY) {
if (board.cells[boardX+1] && board.cells[boardX+1][boardY]) {
return [boardX+1, boardY];
}
else {
return [boardX, boardY];
}
},
getNextLeft: function(boardX,boardY) {
if (board.cells[boardX-1] && board.cells[boardX-1][boardY]) {
return [boardX-1, boardY];
}
else {
return [boardX, boardY];
}
},
getNextUp: function(boardX,boardY) {
if (board.cells[boardX] && board.cells[boardX][boardY+1]) {
return [boardX, boardY+1];
}
else {
return [boardX, boardY];
}
},
getNextDown: function(boardX,boardY) {
if (board.cells[boardX] && board.cells[boardX][boardY-1]) {
return [boardX, boardY-1];
}
else {
return [boardX, boardY];
}
},
draw: function() {
var edgeLength = board.edgeLength;
var cellSize = board.cellSize;
var x = 0;
var y = 0;
var rowLength = edgeLength;
var boardX = 0;
var boardY = 0;
for(n = edgeLength; n > 0; n-=2) {
for(m = rowLength; m > 0; m-=1) {
cell=board.drawCell(x,y,cellSize, boardX, boardY);
if (board.cells[boardX] == undefined) {
board.cells[boardX] = {};
}
board.cells[boardX][boardY] = cell;
cell.attr("data-board-x", boardX).attr("data-board-y", boardY);
x+=1.5*cellSize;
boardX += 1;
}
x=(2+edgeLength-rowLength)*cellSize*0.75;
y+=2.5*cellSize;
boardY+=1;
boardX = boardY;
rowLength-=2;
}
},
drawCell: function(x,y,r, boardX, boardY) {
// var cell = svg.append("circle")
// .attr("cx", x)
// .attr("cy",y)
// .attr("r", r);
// return cell;
var p1,p2,p3;
if (boardX % 2 == boardY % 2) {
p1 = x+","+(y+r);
p2 = (x-r)+","+(y-r);
p3 = (x+r)+","+(y-r);
} else {
p1 = x+","+(y-r);
p2 = (x-r)+","+(y+r);
p3 = (x+r)+","+(y+r);
}
return svg.append("polyline")
.attr("points", p1+" "+p2+" "+p3)
.attr("stroke-width", "2px")
.attr("stroke", "black");
},
getOppositeDirection(direction) {
switch (direction) {
case "E":
return "W"
break;
case "W":
return "E"
break;
case "NE":
return "SW"
break;
case "NW":
return "SE"
break;
case "SE":
return "NW"
break;
case "SW":
return "NE"
break;
}
},
createFood: function() {
var allCells = [];
for (var i in board.cells) {
for (var j in board.cells[i]) {
allCells.push(board.cells[i][j]);
}
}
var done = false;
while(!done) {
var foodCell = allCells[Math.floor(Math.random() * allCells.length)];
if (!foodCell.attr("data-body-part")) {
foodCell.attr("data-is-food",true);
done=true;
}
}
}
};
board.draw();
var snake = {
headPosition: {
boardX: 0,
boardY: 0
},
length: 1,
direction: "E",
draw: function() {
svg.selectAll("polyline")
.attr("fill","black")
.attr("data-body-part", null);
svg.selectAll("polyline[data-is-food=true]")
.attr("fill","green");
var drawX = snake.headPosition.boardX;
var drawY = snake.headPosition.boardY;
var bodyDirection = board.getOppositeDirection(snake.direction);
var drawColor = d3.rgb("#ff0000");
for(i=snake.length;i>0;i--) {
var cell = board.cells[drawX][drawY];
cell.attr("fill",drawColor);
cell.attr("data-body-part", snake.length-i);
var newDirection = cell.attr("data-old-direction");
if (cell.attr("data-old-direction")) {
bodyDirection = board.getOppositeDirection(newDirection);
}
var next = board.getNextCoordinates(drawX, drawY, bodyDirection);
drawX = next[0];
drawY = next[1];
drawColor = drawColor.darker(0.1);
}
svg.selectAll("polyline[fill=black]").attr("data-old-direction", null)
},
move: function() {
var nextPosition = board.getNextCoordinates(snake.headPosition.boardX, snake.headPosition.boardY, snake.direction);
var nextCell = board.cells[nextPosition[0]][nextPosition[1]];
//basic collision detection
//allow crossing of first body part after head (otherwise stuck in corners)
if (nextCell.attr("fill") == "black"
|| nextCell.attr("data-body-part") == 1
|| nextCell.attr("data-is-food")) {
if (nextCell.attr("data-is-food")) {
snake.length += 1;
nextCell.attr("data-is-food", null);
board.createFood();
}
snake.headPosition.boardX = nextPosition[0];
snake.headPosition.boardY = nextPosition[1];
} else {
console.error("collision!");
}
}
}
var game = {
run: function() {
board.createFood();
var t = d3.interval(function(elapsed) {
d3.selectAll("#controls .btn").classed("active", false);
d3.select("#direction-"+snake.direction).classed("active", true);
snake.draw();
snake.move();
}, 200);
}
}
document.addEventListener("keydown", function(e) {
var key = e.key;
switch (key) {
case "ArrowLeft":
changeDirection('W');
e.preventDefault();
break;
case "ArrowRight":
changeDirection('E');
e.preventDefault();
break;
case "ArrowUp":
if (snake.direction.slice(-1) == "E") {
changeDirection('NE');
} else {
changeDirection('NW');
}
e.preventDefault();
break;
case "ArrowDown":
if (snake.direction.slice(-1) == "E") {
changeDirection('SE');
} else {
changeDirection('SW');
}
e.preventDefault();
break;
}
});
function changeDirection(newDirection) {
switch (newDirection) {
case "E":
case "W":
case "NE":
case "NW":
case "SE":
case "SW":
if (newDirection != board.getOppositeDirection(snake.direction)) {
var currentCell = board.cells[snake.headPosition.boardX][snake.headPosition.boardY];
//prevent losing old direction on multiple direction inputs
if (!currentCell.attr("data-old-direction")) {
currentCell.attr("data-old-direction", snake.direction);
}
snake.direction = newDirection;
}
break;
}
}
game.run()
</script>
</body>
</html>