Dynamic Graph Scrolling clear failure

[EthanMankins]

I have a dynamic graph set to scrolling. When I call graph.clear(); it will set the initial graph back to my range 0-100, but once it starts scrolling it instantly jumps to the last highest value being the start of the new range instead of continuing scrolling.

EX: Graphing is as expected to x = 200. Clear. Normal graphing 0-100. Once scroll starts, jumps to range 200-300 and starts graphing at x = 300

0-200 : clear : 0-100 : 200-300 (graph and scrolling starting at 300)

[JTP1]

Hello GS1

Ok, so it seems to be. In this case you must edit GraphWrapAndClear.cpp file. 

Like in Scroll-mode, at WrapAndClear-mode graph we also need to clear dataCounter when clear function is called.

However, after that change we cannot call GraphWrapAndClearData::clear() function when graph is full. So we must also manipulate GraphWrapAndClearData::beforeAddValue() function as well.

So Copy GraphWrapAndClear.cpp from \Middlewares\ST\touchgfx\framework\source\touchgfx\widgets\graph\ folder to \TouchGFX\gui\src\common\ -folder, for example.

Then manipulate clear and beforeAddValue functions like this:

void GraphWrapAndClearData::clear()
{
	// add this line
	dataCounter=0;
	
    invalidateAllXAxisPoints();
    DynamicDataGraph::clear();
}

void GraphWrapAndClearData::beforeAddValue()
{
    if (usedCapacity >= maxCapacity)
    {
		// comment out call of 'clear' from this class, because it would now clear the dataCounter as well
		// Datacounter clearing is not needed when page is full, because we want to keep X value counting
        //clear();
		
		// Add these two lines to 
		invalidateAllXAxisPoints();
		DynamicDataGraph::clear();
		
    }
}

Hope this helps. I'll attach also edited version of this file, it can be just copied to \TouchGFX\gui\src\common\ folder of your project.

BTW It seems that WrapAndOverwrite-mode has the same type bug, I'll check it some other day.

Br JTP

[GS1]

Hi JTP,

thank you very much for this quick help! Now it works as I need it! 

Have a nice evening

BR GS

[JTP1]

Hi GS

Im glad to be able you help you.

If somebody is using WrapAndOverwrite- mode, then it is needed to manipulate GraphWrapAndOverwrite.cpp slightly to get clear- function work properly.

So copy it like at previous posts to \TouchGFX\gui\src\common\ -folder.

Then add two lines:

void GraphWrapAndOverwriteData::clear()
{
	// add these two lines
	dataCounter=0;
	invalidateAllXAxisPoints();
		
    DynamicDataGraph::clear();
    current = 0;
}

After these changes, calling the clear-function from the user code should work.

Br JTP