Charting with flask, rgraph and custom "timeseries database"

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+
+  Backwards compatibility breaks and advisories
+ ===============================================
+
+  o [22-10-2011] IMPORTANT: The default positioning for titles has changed - you may need to adjust the positioning of your titles
+  o [15-10-2011] The Pie chart chart.segments array is being removed (probably November or December) - use .angles array instead.
+  o [15-10-2011] The Pie chart start axis has been changed to the "north" axis (instead of the "east" axis. Please test your charts!
+  o [01-10-2011] Note that due FF7 had issue with the gradient used in the Odometer border so you may find that it has changed very
+                 slightly
+
+                +---------------------------------------------------------------------------------------+
+ o [24-09-2011] | Stable release                                                                        |
+                +---------------------------------------------------------------------------------------+
+
+ o [10-10-2011] The Bar, Line and Scatter charts have had the background grid autofit turned on by default. Also the number
+                of horizontal grid lines has been changed to 5.
+ o [03-10-2011] A change has been made to the Pie chart when using tooltips and the full canvas zoom - please test your charts
+                if upgrading and you use tooltips in conjunction with the zoom.
+
+                +---------------------------------------------------------------------------------------+
+ o [27-08-2011] | Stable release                                                                        |
+                +---------------------------------------------------------------------------------------+
+
+ o [31-08-2011] Donut/Pie chart title positioning may need attention - the default for chart.title.vpos is now 0.5
+                (the vertical centre of the gutter)
+ o [31-08-2011] Filled line charts have been changed - please see the changelog file for more
+                information (20-08-2011). You may need to reverse your colors if you use multiple lines.
+
+                +---------------------------------------------------------------------------------------+
+ o [29-07-2011] | Stable release                                                                        |
+                +---------------------------------------------------------------------------------------+
+
+  o [30-07-2011] When using Line chart specific labels in conjunction with chart.ymin the label positioning
+                 has changed - the labels now start at the X axis vertical position.
+  o [20-07-2011] The chart.segments option is no longer mmaintained - use obj.angles instead
+  o [20-07-2011] When adding a Line chart to a Bar chart some of the Line chart properties are no longer set for you -
+                 you will need to set these yourself if you want them. They are (along with what they were set to):
+
+                    lineObj.Set('chart.noaxes', true);
+                    lineObj.Set('chart.background.barcolor1', 'rgba(0,0,0,0)');
+                    lineObj.Set('chart.background.barcolor2', 'rgba(0,0,0,0)');
+                    lineObj.Set('chart.background.grid', false);
+                    lineObj.Set('chart.ylabels', false);
+
+  o [17-07-2011] The default CSS has been altered for tooltips. This affects all chart types. The changes are:
+                  o There is now no CSS border to the tooltip
+                  o The toltip is now transparent a small amount (opacity=0.9)
+                  o The tooltip shadow X & Y offsets are now zero
+
+                 If you wish to revert these changes you will need to use the tooltip CSS class:
+
+                <style>
+                    .RGraph_tooltip {
+                        // ...
+                    }
+                </style>
+
+                +---------------------------------------------------------------------------------------+
+ o [12-07-2011] | Stable release                                                                        |
+                +---------------------------------------------------------------------------------------+
+
+ o [02-07-2011] The Tradar chart has been renamed to the Radar chart. This will make more identifiable. You WILL
+                need to update you code to the new name!
+ o [25-06-2011] The HBar default colors have changed.
+ o [18-06-2011] The Rose chart has undergone significant changes, now supporting a "stacked" Rose chart as well as
+                a "non-equi-angular" variant. It also now supports chart.colors.sequential property and
+                the default chart.strokestyle value has been changed to rgba(0,0,0,0.5). You may need to set the
+                chart.colors.sequential (to true) to maintain BC.
+
+                +---------------------------------------------------------------------------------------+
+ o [04-06-2011] | Stable release                                                                        |
+                +---------------------------------------------------------------------------------------+
+
+ o [04-06-2011] MAJOR BREAK: The chart.gutter property has been split into four properties:
+                 o chart.gutter.left
+                 o chart.gutter.right
+                 o chart.gutter.top
+                 o chart.gutter.bottom
+                This affects all graph types (except the LED chart) so rigorous testing will be necessary if
+                you choose to upgrade.
+ o [14-05-2011] If you're using chart.width/chart.height, please switch to the individual gutter settings. These
+                provide finer grained and more intuitive control over the gutters and certain things are done for you
+                automatically, like for example adjusting coordinates for tooltips and resizing. The chart.width and
+                chart.height will cease to function starting immediately.
+ o [02-04-2011] The default color for background bars on the Scatter has changed from white to transparent. This was
+                necessary to facilitate background images
+
+                +---------------------------------------------------------------------------------------+
+ o [26-03-2011] | Stable release                                                                        |
+                +---------------------------------------------------------------------------------------+
+ 
+ o [12-03-2011] The RGraph.Clear() API function now clears to transparent, not white. If you wanted it to clear to white
+                you could call this function from the new onclear event:
+
+                function myClear(obj)
+                {
+                    obj.context.beginPath();
+                    obj.context.fillStyle = 'white';
+                    obj.context.fillRect(-10,-10,obj.canvas.width + 20, obj.canvas.height + 20);
+                    obj.context.fill();
+                }
+                
+                DO NOT simply use the RGraph.Clear() function in the onclear event listener function, as you will create an
+                infinite loop.
+
+ o [06-03-2011] The RGraph.getSegment() method has been moved to be a part of both the Pie and Rose objects. This means
+                that if you use it you will have to change your code slightly. This change was necessary to facilitate
+                Pie chart exploded segments. This change will also help prevent bugs in this function in the future.
+ 
+                +---------------------------------------------------------------------------------------+
+ o [28-01-2011] | Stable release                                                                        |
+                +---------------------------------------------------------------------------------------+
+                
+ o [22-01-2011] The RGraph.Clear() function now uses a square 2,000 pixels wide & high
+ o [15-01-2011] The Gantt adjusting array (kept in the RGraph registry) now uses associative/textual keys instead of numeric ones
+ o [08-01-2011] The default number of Line chart X tickmarks has been altered ever-so-slightly: Now if you don't have chart.hmargin
+                set then the X tickmarks will line up with the points on the chart. See the first example on the line chart test
+                page for an example: http://dev.rgraph.net/tests/_line.html
+ o [08-01-2011] The custom RGraph event onannotatestart has been renamed to onannotatebegin. The previous name will still work,
+                but will eventually be removed.
+ 
+                +---------------------------------------------------------------------------------------+
+ o [24-12-2010] | Stable release                                                                        |
+                +---------------------------------------------------------------------------------------+
+
+ o [04-12-2010] chart.key.vpos is now silently converted to chart.key.position.y (note that these two properies behave slightly
+                differently - chart.key.position.y is an absolute coordinate). ALSO; the key has been rewritten, so check that
+                your graphs are working as you expect
+ o [04-12-2010] The HBar labels (from chart.labels.above) now have an extra property (chart.labels.above.decimals) which controls
+                how many decimals are shown. This defaults to 0, and as a result you may need to set this if you're expecting decimals.
+ 
+                +---------------------------------------------------------------------------------------+
+ o [27-11-2010] | Stable release                                                                        |
+                +---------------------------------------------------------------------------------------+
+
+ o [20-11-2010] For the line/bar/scatter, when the X axis is at the bottom and there is a background bar with a 
+                negative start (or it results in a negative end value), you now get a warning.
+ o [13-11-2010] All line chart labels are now shown, regardless of how many points on the line there are.
+ o [06-11-2010] The HBar and Scatter have had their scaled handling changed slightly - now if you specify a maximum Y value,
+                that is what is used.
+ o [06-11-2010] The API function RGraph.getSCale(max, obj) now takes two arguments - the maximum value and the graph object.
+
+                +---------------------------------------------------------------------------------------+
+ o [30-10-2010] | Stable release                                                                        |
+                +---------------------------------------------------------------------------------------+
+
+ o [30-10-2010] The Scatter chart can now only have 1/3/5 labels
+ o [30-10-2010] The Line chart can now only have 1/3/5 labels
+ o [23-10-2010] The Bar chart can now only have 1/3/5/10 labels
+ o [23-10-2010] The default for chart.scale.decimals has changed, as such you may need to specify this:
+                myScatter.Set('chart.scale.decimals', 0);
+ o [09-10-2010] Scatter chart ticksize has changed behaviour slightly, you therefore may need to alter it slightly.
+
+                +---------------------------------------------------------------------------------------+
+ o [25-09-2010] | Stable release                                                                        |
+                +---------------------------------------------------------------------------------------+
+
+ o [18-09-2010] For IE9 compatibility purposes, the IE8 DirectX shadow has been removed from the ModalDialog. This only affects
+                MSIE8. The background is still semi-opaque.
+ o [18-09-2010] The common function RGraph.isIE9() has changed to RGraph.isIE9up(). The old one will continue to work, but
+                not indefinitely.
+ o [11-09-2010] The Odometer properties chart.units.pre and chart.units.post have now changed to chart.value.units.pre
+                and chart.value.units.post. The properties chart.units.post and chart.units.pre are now used for the main
+                labels.
+ o [04-09-2010] HBar and Pie charts have been moved to DOM2 event registration for tooltips
+ o [04-09-2010] The RGraph.number_format() function has had its argument list changed
+ o [04-09-2010] Now that RGraph is moving to DOM2 event handlers, tooltips will be incompatible with IE8
+
+                +---------------------------------------------------------------------------------------+
+ o [28-08-2010] | Stable release                                                                        |
+                +---------------------------------------------------------------------------------------+
+
+ o [28-08-2010] Removed option to have the labels on the outside of a Meter. Now they're always on the inside of the Meter
+                and there's always 11 of them (including zero)
+ o [14-08-2010] Changed the HBar property chart.strokecolor to chart.strokestyle
+ o [07-08-2010] The Odometer property chart.needle.thickness has been changed to chart.needle.width. Work has been done on the
+                needle head.
+ o [07-08-2010] Progress bar has now been split into two different graph types:
+                 o HProgress
+                 o VProgress
+ o [07-08-2010] Progress bar property chart.color is now chart.colors, and should be an array
+ o [07-08-2010] Changed default Bipolar colors to just one - green
+ 
+                +---------------------------------------------------------------------------------------+
+ o [31-07-2010] | Stable release                                                                        |
+                +---------------------------------------------------------------------------------------+
+
+  o [17-07-2010] Stepped line charts and their tickmarks have been marginally altered. No final tickmark is now shown (it looks
+                 odd being isolated)
+  o [17-07-2010] Changed the Odo chart.needle.style to chart.needle.color
+  o [17-07-2010] The Odo properties chart.start, chart.end and chart.value have all been changed to internal properties:
+                 obj.start, obj.end and obj.value
+  o [09-07-2010] With the Odometer the old property chart.needle.style has been renamed to be chart.needle.color
+  o [09-07-2010] The Progress bar has had it's properties chart.max and chart.value changed to class properties, this means
+                 that if you want to make use of these, you will now need to use myProgress.value and myProgress.max.
+                 myProgress being the name of your graph object.
+
+                +---------------------------------------------------------------------------------------+
+ o [26-06-2010] | Stable release                                                                        |
+                +---------------------------------------------------------------------------------------+
+
+ o [08-05-2010] The Rose charts "chart.labels" property is now different to the "chart.key" property
+ o [01-05-2010] The Donut chart is now a variant of the Pie chart (chart.variant = donut)
+ o [24-04-2010] The radar chart has been renamed to Rose. The library is now called RGraph.rose.js and the constructor has
+                been renamed. It has also been prettied up marginally and labels have been added.
+ o [17-04-2010] All charts have had their property "chart.tooltip.effect" renamed to "chart.tooltips.effect".
+                The Scatter chart has also had its property "chart.tooltip.hotspot" renamed to "chart.tooltips.hotspot"
+ o [17-04-2010] Default chart.tooltips bar chart property has changed from an empty array to null.
+ o [17-04-2010] The RGraph.common.js library has now been split into 5 separate files because it had
+                become far too large. You can read the new implementation details here:
+                http://www.rgraph.net/docs/index.html#implementation
+ o [10-04-2010] The "coords" arrays (for each object) have been unified. Now you no longer need to take
+                into account the margins. What you get in the coords arrays are as they are used on the
+                graph.
+
+                +---------------------------------------------------------------------------------------+
+ o [27-03-2010] | Initial stable release                                                                |
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