Hi All,
please apologize me for the newbie question and for my bad attempt to explain
what i'm bring to do.
i'm starting from the WT chart example to make a web app to display data from a
csv file.
the code is :
http://epifanio.whoi.edu/web/ChartsExample.C
at the end of the file this lines of code :
Wt::WSvgImage svgImage(800, 400);
Wt::WPainter p(&svgImage);
chart->paint(p);
p.end();
std::ofstream f("chart.svg");
svgImage.write(f);
save the chart as SVG, but it is executed when the app is loaded.
.. i'm tring to learn how to call and execute that code using a Wtbutton
So i moved it in a method :
void ChartsExample::printG()
{
Wt::WSvgImage svgImage(800, 400);
Wt::WPainter p(&svgImage);
chart->paint(p);
p.end();
std::ofstream f("chart.svg");
svgImage.write(f);
}
then i added a button and connected it to that method :
ChartsExample::ChartsExample(WContainerWidget *root)
: WContainerWidget(root)
{
new WText(WString::tr("introduction"), this);
new CategoryExample(this);
Wt::WPushButton *button = new Wt::WPushButton("PrintG", root);
button->clicked().connect(this, &CategoryExample::printG);
}
the make fail with the error :
dev/src/wt-3.2.0/examples/charts/ChartsExample.C: In member function ‘void
ChartsExample::printG()’:
dev/src/wt-3.2.0/examples/charts/ChartsExample.C:212:5: error: ‘chart’ was not
declared in this scope
my lack of knowledge in C++ doesn't allow me to understand how to pass the
object 'chart' to that method, please have you any hints ?
thanks!!!
Massimo.
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