canvas draw rounded rectangle in reverse? -

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i apologise in advance asking this, kindly provided code draw rounded corner rectangle progress bar great:

http://jsfiddle.net/p2qtq/

i need reverse drawing of rectangle can't life of me manage it

http://jsfiddle.net/p2qtq/7/

i tried changing points @ 4 lines , 4 corners drawn starts top left corner i'm making total mess of it:

    var startt = 0;     var starttr = horizlinelength;     var startr = starttr + cornerlength;     var startbr = startr + vertlinelength;     var startb = startbr + cornerlength;     var startbl = startb + horizlinelength;     var startl = startbl + cornerlength;     var starttl = startl + vertlinelength;

to

var starttl = 0; var startl = starttl + cornerlength; var startbl = startl + vertlinelength; var startb = startbl + cornerlength; var startbr = startb + horizlinelength; var startr = startbr + cornerlength; var starttr = startr + vertlinelength; var startt = starttr = cornerlength;

can point me in right direction please?

instead of this:

drawpercentrect(ui.value);

do this:

drawpercentrect(100-ui.value);

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