In order to simulate real-time chart updates (i.e. horizontal animation), it's necessary to distinguish a removed or added value from a simple update. The dataset controller now hooks array methods that alter the data array length to synchronize metadata accordingly. Also remove the duplicate calls of updateBezierControlPoints() for line and radar charts.
Responsiveness is currently based on the use of an iframe, however this method causes performance issues and could be troublesome when used with ad blockers. So make sure that the user is still able to create a chart without iframe when responsive is false.
CanvasRenderingContext2D.fillText() accepts a fourth parameter called maxWidth that sets the maximum width of the drawn text, enforced by scaling the entire line.
This commit uses the title element's layout dimensions to set maxWidth and avoid overflow outside of the canvas.
Now that the aspect ratio is correctly handled, fix samples for charts with aspect ratio of 1 which was vertically too large. Also fix the default aspect ratio for radar charts which wasn't applied when creating a chart directly using new Chart(ctx, { type: 'radar' }).
When responsive is false and no canvas height explicitly set, the aspectRatio option wasn't applied because of the canvas default height. Prevent the retinaScale method to change the canvas display size since this method is called for none responsive charts, but instead make the resize() responsible of these changes. Also, as discussed some time ago, moved most of the core.js logic into core.controller.js. Clean up the destroy process and make sure that initial canvas values are properly saved and restored.
Add the --inputs command switch to the unittest and unittestWatch tasks, to be able to run unit tests from the specified files only (e.g. gulp unittest --inputs=test/core.element.tests.js;test/core.helpers.tests.js).
Ensure that the hidden iframe is stretched vertically in order to detect height changes. Remove the classlist check/call since it was incorrectly spelled (should be classList), but also useless since the iframe has just been generated. Also remove the callback check: addResizeListener should never be called w/o a valid callback.
Thanks to the Bower team, we have been able to register the chart.js package name, previously pointing on a dead repository, which make the Bower integration more consistent with the npm one. All other alias still work (Chart.js, chartjs, Chart-js, chartjs-Chart.js).
Fixes a rendering issue when there are multiple datasets on a pie chart and they do not all contain the same number of data in their datasets
Fixes#3309
