CPU load problem

[User (Legacy)]

Hello,

I'm using ChartFX for .NET for quite a while. It displays data from 

acquisitions and allows the user to create, modify, move annotations such as 

arrows, texts, etc...

Everything works just fine, as long as the amount of data is small. But if 

the acquisition gets a little longer, moving an annotation in the chart is a 

pain in the neck:

everything goes jerky.

I noticed that the CPU load was very important when the mouse is located in 

the chart and the chart has a lot of values.

Tough luck: in my application, the chart is displayed full screen and of 

course, the mouse is (almost) always located in the chart area.

I used an old test program to try to figure out what was going on. It is 

included in this message as a ZIP file.

With 10 curves with 3000 points each, the CPU load is around 20% when you 

place the mouse cursor on the chart area.

But with 10 curves of 30000 points each, the CPU load sometimes goes up to 

100% !!!

I guess it has to do with the mouse events, but is there a way to keep it 

from using all the CPU power ?

Thanks in advance.

Bruno

PS: the same thing happens with ChartFX for Visual Studio 2005.

[Software FX]

What's using the CPU power is Chart FX trying to determine which point was 

hit in order to highlight and display a tooltip.

You can disable these by doing:

chart1.Highlight.Enabled = false;

chart1.ShowTips = false;

-- 

Francisco Padron

www.chartfx.com

EssaiChartFX.zip

[User (Legacy)]

Thanks, it worked fine on the test program, but did little on the actual 

application.

When I drag an annotation with the mouse, ChartFX repaints the whole chart 

at each mouse event,

and because I'm using a lot of points (say 6 series of 90000 points each) , 

it takes ages (well, seconds)

to repaint.

Is there a way to tell ChartFX that it can repaint the selected annotation 

(the one that I'm dragging), but not

the others, and especially not the curves ?

Thanks in advance.

Bruno

[Software FX]

Dragging the annotation should not cause any repainting until you release 

the mouse, if this is not the behavior you are getting please modify the 

sample program accordingly to show the problem. I was unable to reproduce it 

simply by adding an annotation object to the chart.

Once you release the mouse, in order to paint the annotation it must paint 

what was behind the annotation and this includes the curves.

-- 

Francisco Padron

www.chartfx.com