JQuery UI draggable within a triangle -


i have div (it's rectangle of course) image of triangle background. want move image of circle inside triangle.

i chose jquery ui's draggable use couldn't manage constrain draggable image within triangle.

i thought should use containment option array can't define triangle 2 coordinates.

then found topic: constrain within triangle

there answer pretty uses sinus curve , i've got no idea how define triangle path use.

anyone can how should constrain circle's movement triangle?

one of friends came simple , nice solution: see it

$( "#circle" ).draggable({ drag: function(e, ui) {      var width = $('#triangle').width();     var height = $('#triangle').height();      var x = ui.position.left + $(this).width() / 2;     var y = ui.position.top + $(this).height() / 2;      var difference = math.abs( x - width / 2 );     var min_y = height * ( difference / (width / 2) );     if ( y < min_y ) y = min_y;      if ( x < 0 ) x = 0;     if ( y < 0 ) y = 0;     if ( x > width ) x = width;     if ( y > height ) y = height;      ui.position.top = y - $(this).height() / 2;     ui.position.left = x - $(this).width() / 2;  } });

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