javascript - Wrong Y-axis direction on node select and mouse move in Vivagraph.js -


i made simple graph using vivagraph.js , webglgraphics , added images on nodes. nodes move incorrect on y axis. when select node , move mouse image moves down. how can fix ?

i changed y position negative , works fine images when add text node, node moves in opposite direction mouse

line: 5413 = > changed 

pos.y = ui.position.y;    to=>   pos.y = -ui.position.y;

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