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// Provide a cross-browser interface to a few simple drawing primitives
$.fn.simpledraw = function (width, height, useExisting, interact) {
var target, mhandler;
if (useExisting && (target = this.data('_jqs_vcanvas'))) {
return target;
}
if ($.fn.sparkline.canvas === false) {
// We've already determined that neither Canvas nor VML are available
return false;
} else if ($.fn.sparkline.canvas === undefined) {
// No function defined yet -- need to see if we support Canvas or VML
var el = document.createElement('canvas');
if (!!(el.getContext && el.getContext('2d'))) {
// Canvas is available
$.fn.sparkline.canvas = function(width, height, target, interact) {
return new VCanvas_canvas(width, height, target, interact);
};
} else if (document.namespaces && !document.namespaces.v) {
// VML is available
document.namespaces.add('v', 'urn:schemas-microsoft-com:vml', '#default#VML');
$.fn.sparkline.canvas = function(width, height, target, interact) {
return new VCanvas_vml(width, height, target);
};
} else {
// Neither Canvas nor VML are available
$.fn.sparkline.canvas = false;
return false;
}
}
if (width === undefined) {
width = $(this).innerWidth();
}
if (height === undefined) {
height = $(this).innerHeight();
}
target = $.fn.sparkline.canvas(width, height, this, interact);
mhandler = $(this).data('_jqs_mhandler');
if (mhandler) {
mhandler.registerCanvas(target);
}
return target;
};
$.fn.cleardraw = function () {
var target = this.data('_jqs_vcanvas');
if (target) {
target.reset();
}
};
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