I've got an application which "misuses" PieCharts in place of bubblecharts because I need to show percentage distributions inside the pie/bubble.
So I just create many PieCharts, put them on a 800 x 400 canvas by specifying x and y coordinates within the canvas and the width+height of each PieChart. In this case the location of the PieChart on the canvas is important, the width/height also. I end up with 17 PieCharts, some of them overlapping with others, on the canvas. Fine.
However, for some reason, for some PieCharts the numeric size and the size on the screen are out of proportions. A PieChart of width 43 has a diameter of only one-sixth of a PieChart of width 136. Any ideas what could cause this?