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  Hi all, I am trying to use zooming function but I am stuck.
Posted by Kaiden Kwon on Jun-13-2013 15:10
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Hi all,
I am new to CD.
I need to have my charts with zooming functions.

so I am currently studying, well, trying to study the :simple zoom and scroll".

I made a new project and declared all the variables and functions,
but can't find where or what "floor" and "ceil"  are.
Can you help me please?!

thank you in advance!! :)

//part of simplezoomscroll.cpp
.....
void CSimplezoomscrollDlg::drawChart(CChartViewer *viewer)
{
    // Get the start date and end date that are visible on the chart.
    double viewPortStartDate = viewer->getValueAtViewPort("x", viewer-
>getViewPortLeft());
    double viewPortEndDate = viewer->getValueAtViewPort("x", viewer->getViewPortLeft() +
        viewer->getViewPortWidth());

    // Get the array indexes that corresponds to the visible start and end dates
    int startIndex = (int)floor(Chart::bSearch(m_timeStamps, viewPortStartDate));
                                 ^

    int endIndex = (int)ceil(Chart::bSearch(m_timeStamps, viewPortEndDate));
                               ^
    int noOfPoints = endIndex - startIndex + 1;

  Re: No need Peter! it's settled! :)
Posted by Kaiden Kwon on Jun-13-2013 21:15
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No need Peter! it's settled! :)