Hi Massimo,
On Wed, May 16, 2012 at 3:09 AM, Massimo Di Stefano <
[email protected]> wrote:
> 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);
> }
>
>
The "charts" variable should be a class variable instead of constructors.
Its a scoping issue.
In CharsExample.h
you need to have
class ChartsExample {
....
private:
WCartesianChart *chart;
.....
};
in ChartsExample.C
use
chart = new WChartesianChart(.......);
remember dont declare chart again in contructor instead define it.
>
> 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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--
Regards,
Rashad
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