svg-draw-demo

    if (SVG.supported) {
        // create svg drawing

        var draw = SVG('canvas').size('100%', '100%')


        var rect2 = draw.rect();
            //var rect2 = draw.circle();
            //var rect2 = draw.polyline();
            //var rect2 = draw.ellipse();

        draw.on('mousedown', function(event){
            rect2.draw(event);
        });
        draw.on('mouseup', function(event){
            rect2.draw(event);
        });

    } else {
        alert('SVG not supported')
    }