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    <p>Ok, so after some time looking for another graphing library I found nothing good enough :) That made me look into ACE again and I ended up doing a small patch which makes it "usable" for me although far from ideal.</p> <p>On XYSeries.java I added a new method:</p> <pre><code>/** * Removes the first value from the series. * Useful for sliding, realtime graphs where a standard remove takes up too much time. * It assumes data is sorted on the key value (X component). */ public synchronized void removeFirst() { mXY.removeByIndex(0); mMinX = mXY.getXByIndex(0); } </code></pre> <p>I found that on top of the memory issues there where some real speed issues at high speed framerates too. I was spending around 90% of the time on the remove function as I removed points which scrolled out of view. The reason is that when you remove a min|max point ACE calls InitRange which iterates over every point to recalculate those min/max points it uses internally. As I'm processing 1000 telemetry frames per sec and a have a small viewport (forced by ACE memory allocation strategies) I hit min/max points very often on the remove function. I created a new method used to remove the first point of a series which will normally be called as soon as you add a point which makes that one scroll out of your viewport. If your points are sorted on key value (classic dateTime series) then we can adjust mMinX so the viewport still looks nice and do that very fast. We can't update minY or maxY fast with the current ACE implementation (not that I looked into it though), but if you set up an appropriate initial range it may not be required. In fact I manually adjust the range from time to time using extra information I have because I know what I'm plotting and what the normal ranges are at different points in time.</p> <p>So, this might be good enough for someone else but I insist that a memory allocation refactoring is still required on ACE for any serious realtime graphing.</p>
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    1. POIs achartengine ready for realtime graphing?
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