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    <p>I actually ran into this problem (more of a mental block, actually...).</p> <p>First of all I copy-pasted some wx Plot code from <a href="http://wiki.wxpython.org/Using%20wxPython%20Demo%20Code" rel="nofollow">wx Demo Code</a>. </p> <p>What I do is keep a live log of a value, and compare it to two markers (min and max, shown as red and green dotted lines) (but I will make these 2 markers optional - hence the optional parameters).</p> <p>In order to implement the live log, I first wanted to use the deque class, but since the data is in tuple mode (x,y coordinates) I gave up and just tried to rewrite the entire parameter list of tuples: see _update_coordinates.</p> <p>It works just fine for keeping track of the last 100-10,000 plots. Would have also included a printscreen, but I'm too much of a noob at stackoverflow to be allowed :))</p> <p>My live parameter is updated every 0.25 seconds over a 115kbps UART.</p> <p>The trick is at the end, in the custom refresh method!</p> <p>Here is most of the code:</p> <pre><code>class DefaultPlotFrame(wx.Frame): def __init__(self, ymin=0, ymax=MAXIMUM_PLOTS, minThreshold=None, maxThreshold=None, plotColour='blue', title="Default Plot Frame", position=(10,10), backgroundColour="yellow", frameSize=(400,300)): self.minThreshold = minThreshold self.maxThreshold = maxThreshold self.frame1 = wx.Frame(None, title="wx.lib.plot", id=-1, size=(410, 340), pos=position) self.panel1 = wx.Panel(self.frame1) self.panel1.SetBackgroundColour(backgroundColour) self.ymin = ymin self.ymax = ymax self.title = title self.plotColour = plotColour self.lines = [None, None, None] # mild difference between wxPython26 and wxPython28 if wx.VERSION[1] &lt; 7: self.plotter = plot.PlotCanvas(self.panel1, size=frameSize) else: self.plotter = plot.PlotCanvas(self.panel1) self.plotter.SetInitialSize(size=frameSize) # enable the zoom feature (drag a box around area of interest) self.plotter.SetEnableZoom(False) # list of (x,y) data point tuples self.coordinates = [] for x_item in range(MAXIMUM_PLOTS): self.coordinates.append((x_item, (ymin+ymax)/2)) self.queue = deque(self.coordinates) if self.maxThreshold!=None: self._update_max_threshold() #endif if self.lockThreshold!=None: self._update_min_threshold() #endif self.line = plot.PolyLine(self.coordinates, colour=plotColour, width=1) self.lines[0] = (self.line) self.gc = plot.PlotGraphics(self.lines, title, 'Time', 'Value') self.plotter.Draw(self.gc, xAxis=(0, MAXIMUM_PLOTS), yAxis=(ymin, ymax)) self.frame1.Show(True) def _update_max_threshold(self): if self.maxThreshold!=None: self.maxCoordinates = [] for x_item in range(MAXIMUM_PLOTS): self.maxCoordinates.append((x_item, self.maxThreshold)) #endfor self.maxLine = plot.PolyLine(self.maxCoordinates, colour="green", width=1) self.maxMarker = plot.PolyMarker(self.maxCoordinates, colour="green", marker='dot') self.lines[1] = self.maxMarker #endif def _update_live_param(self, liveParam, minParam, maxParam): if minParam!=None: self.minThreshold = int(minParam) self._update_min_threshold() #endif if maxParam!=None: self.maxThreshold = int(maxParam) self._update_max_threshold() #endif if liveParam!=None: self._update_coordinates(int(liveParam)) #endif def _update_coordinates(self, newValue): newList = [] for x,y in self.coordinates[1:]: newList.append((x-1, y)) #endfor newList.append((x, newValue)) print "New list", newList self.line = (plot.PolyLine(newList, colour=self.plotColour, width=1)) self.lines[0] = self.line self.coordinates = newList def _MyLIVE_MAGIC_refresh__(self, liveParam=None, minParam=None, maxParam=None): self._update_live_param(liveParam, minParam, maxParam) self.gc = plot.PlotGraphics(self.lines, self.title, 'Time', 'Value') self.plotter.Draw(self.gc, xAxis=(0, MAXIMUM_PLOTS), yAxis=(self.ymin, self.ymax)) self.plotter.Refresh() self.frame1.Refresh() </code></pre>
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