Re: [swtchart-dev] Buffering Chart Data via a Bitmap

[Philip Wenig <philip.wenig@xxxxxxxxxxxxx>]

    Hi Yash,
    
    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,

I looked at the issue-https://github.com/eclipse/swtchart/issues/85

Does that mean the chart will be converted into a graphic image and then scaled or resized whenever zoomed in or out instead of redrawing?

The chart can be converted into an image using ImageSupplier class,

ImageSupplier imageSupplier = new ImageSupplier();
ImageData imageData = imageSupplier.getImageData(scrollableChart.getBaseChart());

Image image=new Image(display,imageData);

Thanks,

Yash

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