Thus, prevent it from becoming topmost (it may cause strange looks if original series is not topmost: some part of it becomes topmost and overwrites some lines and points that should be above it instead).
Due to limitations in our plugin architecture, the categories plugin duplicates code from Flot's core for adding a dummy point to snap the y axis to zero. We can get rid of this duplication in 0.9; for now we'll just update the duplicate to match the change in core that introduced the new 'zero' option.
Use bind, rather than .mouseleave, because we officially still support jQuery 1.2.6, which doesn't define a shortcut for mouseenter or mouseleave. This was a bug/oversight that was fixed somewhere around 1.3.x. We can return to using .mouseleave when we drop support for 1.2.6.
Rounding errors are introduced when calculating the percentage when the total is 100 (for example if percentages have already been calculated). Calculating (total/100) first eliminates the error in this case.
Added a format option 'autoscale' that controls whether the given point is considered when determining an automatic scale. The lines & bars 'zero' option controls whether autoscale is set on the dummy point that is inserted to create the series lower-bound.
Area and bar plots normally use a minimum of zero, since their purpose is to show size, and using an auto-scaled minimum distorts the plot's meaning. But this behavior is undesirable in cases where the plot type is used in more of a decorative sense. The zero option provides a way to control this behavior. It defauls to true for bars and filled lines.
When the placeholder has (or inherits) the HTML 'dir' attribute or CSS 'direction' we get unexpected results from text metrics, resulting in visual glitches on the axes. The suggested solution in #716 was to set ltr on the placeholder, but this introduces its own problems, since the user probably *does* expect rtl on items like the legend. So we'll instead set ltr only on the canvases. We should review this behavior at some point; rtl is something we need to handle, not work around. It also needs to be kept in mind as we move canvas-text into a plugin. But for now this solution at least ensures consistent behavior.
When a pie's labels don't fit within its container, the pie is redrawn with a smaller radius until the labels fit, or a fixed number of retry attempts are exhausted. The redraw flag was not reset on success, however, which prevented the pie from being redrawn again after a resize or update.