Adding grid over Fabric.js canvas
I just started using Fabric.js (I have to say, I'm impressed).
I want to add a grid over the fabric objects. In the following code, I am putting my grid canvas right over on the Fabric canvas. The problem here is that, I now cannot move my fabric objects!
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<script type='text/javascript' src='http://code.jquery.com/jquery-1.7.1.js'></script>
<script type='text/javascript' src='http://cdnjs.cloudflare.com/ajax/libs/fabric.js/1.2.0/fabric.all.min.js'></script>
</head>
<body>
<div style="height:480px;width:640px;border:1px solid #ccc;position:relative;font:16px/26px Georgia, Garamond, Serif;overflow:auto;">
<canvas id="rubber" width="800" height="800"
style="position: absolute; left: 0; top: 0; z-index: 0;"></canvas>
<canvas id="myCanvas" width="800" height="800"
style="position: absolute; left: 0; top: 0; z-index: 1;"></canvas>
</div>
<script>
//<![CDATA[
$(window).load(function(){
$(document).ready(function () {
function renderGrid(x_size,y_size, color)
{
var canvas = $("#myCanvas").get(0);
var context = canvas.getContext("2d");
context.save();
context.lineWidth = 0.5;
context.strokeStyle = color;
// horizontal grid lines
for(var i = 0; i <= canvas.height; i = i + x_size)
{
context.beginPath();
context.moveTo(0, i);
context.lineTo(canvas.width, i);
context.closePath();
context.stroke();
}
// vertical grid lines
for(var j = 0; j <= canvas.width; j = j + y_size)
{
context.beginPath();
context.moveTo(j, 0);
context.lineTo(j, canvas.height);
context.closePath();
context.stroke();
}
context.restore();
}
renderGrid(10,15, "gray");
});
});//]]>
var canvas = new fabric.Canvas('rubber');
canvas.add(new fabric.Circle({ radius: 30, fill: '#f55', top: 100, left: 100 }));
canvas.selectionColor = 'rgba(0,255,0,0.3)';
canvas.selectionBorderColor = 'red';
canvas.selectionLineWidth = 5;
</script>
</body>
</html>
I am hoping that there is a way to do this in Fabric itself.
Any help would be awesome, thanks!
Answer
This two lines of code will work:
var gridsize = 5;
for(var x=1;x<(canvas.width/gridsize);x++)
{
canvas.add(new fabric.Line([100*x, 0, 100*x, 600],{ stroke: "#000000", strokeWidth: 1, selectable:false, strokeDashArray: [5, 5]}));
canvas.add(new fabric.Line([0, 100*x, 600, 100*x],{ stroke: "#000000", strokeWidth: 1, selectable:false, strokeDashArray: [5, 5]}));
}