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  AddZone on FinanceChart
Posted by dale on Aug-22-2011 13:45
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I have a scrolling FinanceChart with OHLC.  I use setData and a timeStamp array for the x-axis which are in charttime format (a double representing seconds).  If I use,

x->xAxis()->addZone(timestart[start], timestart[stop],0xffcc66)

I get nothing.

If I use,

x->xAxis()->addZone(10,20,0xffcc66),

then I get a zone starting at the 10th candle and going to the 20th candle, that never changes as I scroll.

Code snippet below:

int noOfPoints = endIndex - startIndex + 1;
    // Create the chart object using the selected size
    FinanceChart m(m_chartWidth);

    // Set the data into the chart object

int extraTrailingPoints = 0; // Will use later, see financedemodlg
int extraPoints = 0;

m.setData(
DoubleArray(&m_timeStamps[startIndex], noOfPoints + extraTrailingPoints),
DoubleArray(&m_highData[startIndex], noOfPoints),
DoubleArray(&m_lowData[startIndex], noOfPoints),
DoubleArray(&m_openData[startIndex], noOfPoints),
DoubleArray(&m_closeData[startIndex], noOfPoints),
DoubleArray(&m_volData[startIndex], noOfPoints),
extraPoints);

    CString companyName="TEST";
    m.addPlotAreaTitle(Chart::TopLeft, TCHARtoUTF8(companyName));

    const char *resolutionText = "";
char buffer[1024];
    sprintf(buffer, "<*font=arial.ttf,size=8*>%s - %s chart",
        m.formatValue(Chart::chartTime2((int)time(0)), "mmm dd, yyyy"), resolutionText);
    m.addPlotAreaTitle(Chart::BottomLeft, buffer);

    m.addPlotAreaTitle(Chart::BottomRight,
        "<*font=arial.ttf,size=8*>(c) dkdkdkdk");

XYChart *x;
    x = m.addMainChart(m_chartHeight);

    x->xAxis()->addZone(m_timeStamps[startIndex+10],
m_timeStamps[endIndex-5],
0xffcc66);

  Re: AddZone on FinanceChart
Posted by Peter Kwan on Aug-23-2011 00:14
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Hi dale,

If you want to set a zone starting from the label m_timeStamps[start] to m_timeStamps[stop], then in your existing code structure, you may use:

x->xAxis()->addZone(start - startIndex, stop - startIndex, 0xffcc66);

It is because the actual array you pass to ChartDirector is m_timeStamps + startIndex, so the array index is (m_timeStamps + startIndex)[start - startIndex].

Hope this can help.

Regards
Peter Kwan