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Hi ! I think that I ask is not possible but I try I want to do multiplications and divisions with macros of annotations. For exemple here the JSFiddle : http://jsfiddle.net/x5FBh/620/ I try to put the green circle (last annotation in code) in the center of the canvas, how can I do that ? I tried like the JSFiddle exemple : $canvasStartX + ($canvasWidth / 2) But the ($canvasWidth / 2) is ignored, when i remove brackets / 2 is ignored. Do you have any other solution for me ? Keep in mind the chart is dynamically resized, so fixed values don't work. Thank you, Sébastien