via the chart settings, event processors can be defined.
This makes it possible to completely changes the events of a
chart. Three default actions are required to make the user
selection:
The user selection is handled after mouse up event here:
org.eclipse.swtchart.extensions.core.BaseChart
private void handleUserSelectionXY(Event event) {
/*
* Track the selection before the new range is
* selected by the user.
*/
trackUndoSelection();
int xStart = userSelection.getStartX();
int xStop = userSelection.getStopX();
int yStart = userSelection.getStartY();
int yStop = userSelection.getStopY();
setSelectionXY(xStart, xStop, yStart, yStop);
trackRedoSelection();
/*
* Inform all registered handlers.
* Reset the current selection and redraw the chart.
*/
fireUpdateCustomRangeSelectionHandlers(event);
}
Best,
Philip
Am 31.03.20 um 07:32 schrieb Yash Bharatiya:
Hi,
I tried implementing the above mentioned idea and
looked into the code base,
I used suspendUpdate() to lock the chart and the
series plotting ,but I am having difficulty in
understanding how the scrollable chart handles various
events.
Could you briefly explain how event handling is
done in the scrollable chart.
yep, that's idea. I have the following workflow in
mind:
1) start zoom action
2) lock the chart and disable series plotting
3) convert current chart (BaseChart) to an image
(png) via the image supplier)
4) set the image:
getPlotArea().getControl().setBackgroundImage(image)
5) let the user select the range
6) stop zoom action
7) clear the image:
getPlotArea().getControl().setBackgroundImage(null);
8) enable series plotting
9) unlock the chart
10) redraw
Creating the image should be relatively fast as the
plot is drawn already and thus the display is
available. We should give this idea a try.
Best,
Philip
Am 28.03.20 um 05:09 schrieb Yash Bharatiya:
Hi,
Currently SWTChart redraws everytime the
user zooms in or out causing performance
issues,
--
~~~~~~~~~~~~~~~~~~~~~~~~
OpenChrom - the open source alternative for chromatography / mass spectrometry
Dr. Philip Wenig » Founder » philip.wenig@xxxxxxxxxxxxx » http://www.openchrom.net
~~~~~~~~~~~~~~~~~~~~~~~~
--
~~~~~~~~~~~~~~~~~~~~~~~~
OpenChrom - the open source alternative for chromatography / mass spectrometry
Dr. Philip Wenig » Founder » philip.wenig@xxxxxxxxxxxxx » http://www.openchrom.net
~~~~~~~~~~~~~~~~~~~~~~~~
--
~~~~~~~~~~~~~~~~~~~~~~~~
OpenChrom - the open source alternative for chromatography / mass spectrometry
Dr. Philip Wenig » Founder » philip.wenig@xxxxxxxxxxxxx » http://www.openchrom.net
~~~~~~~~~~~~~~~~~~~~~~~~