CODEWITHSUNDEEP
javascripthtml
micah
micah

Reputation: 1975

How do I make a canvas drawing to completely fill the browser?

Here's the code I currently have.

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> 
<script src="http://code.jquery.com/jquery-1.4.2.min.js"></script> 
<script>
function draw()
{
    var diagCanvas = document.getElementById("diag-cnvs");

diagCanvas.height=window.innerHeight;
diagCanvas.width=window.innerWidth;

    if (diagCanvas.getContext)
    {
        var ctx = diagCanvas.getContext("2d");
        var h = w = 100;
        var color1 = 'rgba(255,0,0,1)';
        var color2 = 'rgba(255,0,0,.2)';
        var x = y = 0;

        while(y<diagCanvas.height)
        {
            while(x<diagCanvas.width)
            {
                ctx.fillStyle = color2;
                ctx.fillRect( x, y, w, h);

                ctx.fillStyle = color1;
                ctx.lineTo( x, y);
                ctx.lineTo( x+w/2, y);
                ctx.lineTo( x, y+h/2);
                ctx.lineTo( x, y);
                ctx.moveTo( x+w, y);
                ctx.lineTo( x+w, y+h/2);
                ctx.lineTo( x+w/2, y+h);
                ctx.lineTo( x, y+h);
                ctx.fill();
                ctx.closePath();

                x+=w;
            }
            y+=h;
            x=0;
        }
    }
}
$(function() {
    draw();
})
</script>
<style>
    canvas {
    position: absolute;
    top: 0;
    left: 0;
}
</style>
</head>
<body>
<canvas height="100" width="100" id="diag-cnvs"></canvas>
</body>
</html>

I'd like to keep the height and width dimensions the same for the canvas shape but it'd be great to have this completely fill the browser 100% or basically repeat indefinitely, similar to the CSS value for a background-image to repeat on both x and y axis.

Eventually, I'd like to add two or three more colors to the stripes, but I only vaguely understand what's going on in this code since I'm brand new to it.

Upvotes: 3

Views: 1634

Answers (4)

jakopo87
jakopo87

Reputation: 96

function draw()
{
    var diagCanvas = document.getElementById("diag-cnvs");

    if(document.documentElement.offsetHeight<window.innerHeight)
           diagCanvas.height = window.innerHeight;
    else
           diagCanvas.width = document.documentElement.offsetHeight;
    diagCanvas.width=document.documentElement.offsetWidth;

    if (diagCanvas.getContext)
    {
        var ctx = diagCanvas.getContext("2d");
        var h = w = 100;
        var color1 = 'rgba(255,0,0,1)';
        var color2 = 'rgba(255,0,0,.2)';
        var x = y = 0;

        while(y<diagCanvas.height)
        {
            while(x<diagCanvas.width)
            {
                ctx.fillStyle = color2;
                ctx.fillRect( x, y, w, h);

                ctx.fillStyle = color1;
                ctx.lineTo( x, y);
                ctx.lineTo( x+w/2, y);
                ctx.lineTo( x, y+h/2);
                ctx.lineTo( x, y);
                ctx.moveTo( x+w, y);
                ctx.lineTo( x+w, y+h/2);
                ctx.lineTo( x+w/2, y+h);
                ctx.lineTo( x, y+h);
                ctx.fill();
                ctx.closePath();

                x+=w;
            }
            y+=h;
            x=0;
        }
    }
}

Upvotes: 3

Sunday Ironfoot
Sunday Ironfoot

Reputation: 13050

This should be possible, I've done it with a Canvas, though the code is at home and I'm at work so I'll take a stab at what it should be. One thing to point out, if you want it to maintain the correct aspect ratio of the image/canvas then you need to use JavaScript (well I couldn't figure it out, someone enlighten me), otherwise you can use pure CSS:

... header (snip) ...
</head>
<body>
    <div id="Page">
        <canvas id="MyCanvas" width="500" height="500"></canvas>
    </div>
</body>
</html>

And CSS:

body { width: 100%; height: 100%; }
#Page { position: absolute; top: 0; right: 0; bottom: 0; left: 0 }

#MyCanvas { height: 100%; width: 100%; }

If that doesn't work try changing #MyCanvas to

#MyCanvas { position: absolute; top: 0; right: 0; bottom: 0; left: 0 }

I'm sure it's something to that effect, I have got this working, I'll double check my code when I get home from work.

Upvotes: 0

Davy Meers
Davy Meers

Reputation: 1798

using css:

#diag-cnvs{
    position: absolute;
    top:      0px;
    left:     0px;
    right:    0px;
    bottom:   0px;
    width:    100%;
    height:   100%;
}

Upvotes: 0

Robbert
Robbert

Reputation: 345

Are you adding this canvas to the body element of the page? Also, you could try

position: absolute; top: 0px; left: 0px;

Upvotes: 1

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