Untitled

<!DOCTYPE HTML>
<html>
 <head>
  <meta charset="utf-8">
  <title>Hexagons on canvas</title>
 </head>
<body>

<canvas id="hexagonCanvas" width="1600" height="1000"></canvas>
<script type="text/javascript">

(function() {
 var canvas = document.getElementById('hexagonCanvas');
 var hexHeight,
     hexRadius,
     hexRectangleHeight,
     hexRectangleWidth,
     hexagonAngle = 0.523598776, //30 градусов в радианах
     sideLength = 16    , //длина стороны, пискелов
     boardWidth = 16, //ширина "доски" по вертикали
     boardHeight = 16; //высота "доски" по вертикали

 hexHeight = Math.sin(hexagonAngle) * sideLength;
 hexRadius = Math.cos(hexagonAngle) * sideLength;
 hexRectangleHeight = sideLength + 2 * hexHeight;
 hexRectangleWidth = 2 * hexRadius;

// if (canvas.getContext) {
  var ctx = canvas.getContext('2d');
  ctx.fillStyle = "#000000";
  ctx.strokeStyle = "#d2d2d2";
  ctx.lineWidth = 2;
  drawBoard(ctx, boardWidth, boardHeight); //первичная отрисовка
  canvas.addEventListener("mousemove", function(eventInfo) { //слушатель перемещения мыши
   var x = eventInfo.offsetX || eventInfo.layerX;
   var y = eventInfo.offsetY || eventInfo.layerY;
   var hexY = Math.floor(y / (hexHeight + sideLength));
   var hexX = Math.floor((x - (hexY % 2) * hexRadius) / hexRectangleWidth);
   var screenX = hexX * hexRectangleWidth + ((hexY % 2) * hexRadius);
   var screenY = hexY * (hexHeight + sideLength);
   ctx.clearRect(0, 0, canvas.width, canvas.height);
   drawBoard(ctx, boardWidth, boardHeight); //перерисовка на mousemove
   //На доске ли координаты грызуна?
   //if (hexX >= -boardWidth/2 && hexX <= boardWidth) {
    //if (hexY >= -boardHeight/2 && hexY <= boardHeight) {
     ctx.fillStyle = "#4dfe4d";//
     drawHexagon (ctx, screenX, screenY, true);
    //}
   //}
  });
//}

 function drawBoard (canvasContext, width, height) {
  for (var i = 0; i < width*4; i++) {
   for (var j = 0; j < height*4; j++) {
    drawHexagon (ctx, i * hexRectangleWidth + ((j % 2) * hexRadius),
     j * (sideLength + hexHeight), false);
   }
  }
 }

 function drawHexagon (canvasContext, x, y, fill) {
  var fill = fill || false;
  canvasContext.beginPath();
  canvasContext.moveTo (x + hexRadius, y);
  canvasContext.lineTo (x + hexRectangleWidth, y + hexHeight);
  canvasContext.lineTo (x + hexRectangleWidth, y + hexHeight + sideLength);
  canvasContext.lineTo (x + hexRadius, y + hexRectangleHeight);
  canvasContext.lineTo (x, y + sideLength + hexHeight);
  canvasContext.lineTo (x, y + hexHeight);
  canvasContext.closePath();
  if (fill) canvasContext.fill();
  else canvasContext.stroke();
 }
})();
</script>
<noscript><div>Извините, требуется включённый Javascript для работы приложения!</div></noscript>

</body></html>