I am building a surface with 2 viewports and then trying to update both with
real-time data. The problem I am having is that only the last viewport built
gets data added to it. The data is correct and the plot looks good, except that
only one chart has it. Here is a snippet of the code:
// In Cairo window constructor
{
...
// Initialize the surface and build the viewports
mPLS = new plstream();
// Re-size the device view surface to the size of the cairo window
std::string geom(ATMLabUtils::Strings::ToString(this->w()) + "x" +
ATMLabUtils::Strings::ToString(this->h()));
mPLS->setopt("-geometry", geom.c_str());
mPLS->sdev("extcairo");
//mPLS->star(2, 1);
mPLS->init();
mPLS->cmd(PLESC_DEVINIT, fltk::cr);
mPLS->adv(0);
// Create the viewports (see below for details of the UFMPlot class
mPLS->vpor(0.1, 0.45, 0.15, 0.9);
mPlots.push_back(UFMPlot(mPLS));
mPLS->vpor(0.55, 0.9, 0.15, 0.9);
mPlots.push_back(UFMPlot(mPLS));
...
}
// In Cairo window real-time update data capture call
{
...
for(unsigned int i = 0; i < mPlots.size(); ++i)
{
//The values t and y2 are computed elsewhere and passed to this call
mPlots[i].AddPoint(t, y2, 0);
}
//if ( n % 2 )
// mPLS->stripa( id1, 0, t, y1 );
//if ( n % 3 )
// mPLS->stripa( id1, 1, t, y2 );
//if ( n % 4 )
// mPLS->stripa( id1, 2, t, y3 );
//if ( n % 5 )
// mPLS->stripa( id1, 3, t, y4 );
...
}
///// UFMPlot class snippet
UFMPlot(plstream *pls) : mPLS(pls)
{
if(pls == NULL)
{
throw(std::string("UFMPlot() : You need a valid plstream
reference."));
}
mPLS->col0(1);
// scale the window to the data world coordinates and build the
bounding box
mPLS->wind(0.0, 100.0, -1.0, 1.0);
mPLS->box("bcnst", 0.0, 0, "bcnstv", 0.0, 0);
mPLS->col0(2);
mPLS->lab("time (sec)", "Signal", "Test plot");
// Build a grid
mPLS->box("g", 10.0, 0, "g", 0.1, 0);
pX = pY = 0;
}
void AddPoint(PLFLT x, PLFLT y, PLINT pen)
{
mPLS->col0(4);
// Store the data into stl vectors
mData.Add(x, y, pen);
unsigned int xc, yc;
// These 2 calls return the pointer to the top of the x and y
data vectors which is what plplot needs.
PLFLT *X = mData.GetArray(UFMPlotDataSet::X, 0, pen, xc);
PLFLT *Y = mData.GetArray(UFMPlotDataSet::Y, 0, pen, yc);
unsigned int count = xc < yc ? xc : yc;
mPLS->line(count, X, Y);
}
-Marco
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