HTML5 responsive canvas: resizing the browser canvas draw disappear

Question

I want to make a responsive canvas using size in percentage and once user will resize the window the canvas adjust relatively. I am able to scale the canvas by using below c

Answer 1

I also had the same issue that your are facing in mu application, and after reading about it i came to this conclusion that the behavior of the canvas element is such that it clears itself after re-sizing, the only fix for this is to add a listener for the window re-size event and redraw the canvas when the event if fired.

$(window).resize(function(e) {
// function to redraw on the canvas
});



$(document).ready(function(e){
    var c = $('#example'); // getting the canvas element
    var ct = c.get(0).getContext('2d');
    var container = $(c).parent();
    $(window).resize( respondCanvas ); //handling the canvas resize
    function respondCanvas(){ 
        // makign the canvas fill its container
        c.attr('width', $(container).width() ); //max width
        c.attr('height', ($(container).height() -20 )); //max height
    }
    respondCanvas();
    make_image('images/india.png',1,1);
}

Hope it helps.

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