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144 lines
5.1 KiB
Markdown
144 lines
5.1 KiB
Markdown
# Tutorial (JKQTPlotter): Using a JKQTPlotter inside a Qt User Interface Designer (UI) File {#JKQTPlotterQtCreator}
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This project (see `./examples/simpletest_ui/`) demonstrates how to create add a `JKQTPlotter` inside the Qt Form Editor (e.g. called from of Qt Creator) into a widget.
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## Instructions on how to use JKQTPlotter in the Qt Form Designer
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For this to work you have to follow the steps shown below:
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1. add a new UI-file to your project and open it in the Form Editor. Then right-click the form and select `Promote Widgets ...`:<br>
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2. In the dialog that opens, you have to define `JKQTPlotter` as a promotion to `QWidget` as shown below. Finally store the settings by clicking `Add` and closing the dialog with `Close`.<br>
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3. Now you can add a `QWidget`from the side-bar to the form and then promote it to `JKQTPlotter`, by selecting and right-clicking the `QWidget` and then selecting `Promote To | JKQTPlotter`:<br>
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## QMake-Project of this example
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The QMake project for such a project looks like this (see [`jkqtplotter_simpletest_ui.pro`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/simpletest_ui/jkqtplotter_simpletest_ui.pro):
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```.qmake
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# source code for this simple demo
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SOURCES = jkqtplotter_simpletest_ui.cpp \
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formwithjkqtplotter.cpp
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FORMS += formwithjkqtplotter.ui
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HEADERS += formwithjkqtplotter.h
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# configure Qt
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CONFIG += qt
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QT += core gui xml svg
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greaterThan(QT_MAJOR_VERSION, 4): QT += widgets printsupport
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# output executable name
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TARGET = jkqtplotter_simpletest_ui
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# include JKQTPlotter source headers and link against library
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DEPENDPATH += ../../lib ../../staticlib/jkqtplotterlib
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INCLUDEPATH += ../../lib
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CONFIG (debug, debug|release) {
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LIBS += -L../../staticlib/jkqtplotterlib/debug -ljkqtplotterlib_debug
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} else {
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LIBS += -L../../staticlib/jkqtplotterlib/release -ljkqtplotterlib
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}
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message("LIBS = $$LIBS")
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win32-msvc*: DEFINES += _USE_MATH_DEFINES
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```
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As you can see there is a main CPP-file (shown below) and a `formwithjkqtplotter.ui`-file with the `formwithjkqtplotter.cpp/.h`-files that are used to implement the functionality behind the form (see next chapter).
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The source code of the main application is simply instanciating the Form class `FormWithJKQTPlotter` from `formwithjkqtplotter.ui/.h/.cpp`:
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```.cpp
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#include <QApplication>
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#include "formwithjkqtplotter.h"
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int main(int argc, char* argv[])
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{
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QApplication app(argc, argv);
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FormWithJKQTPlotter plot;
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plot.show();
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plot.resize(600,400);
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return app.exec();
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}
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```
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## Form Class `FormWithJKQTPlotter`
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The Form was designed in the Qt Form Designer within Qt Creator, using the method described above (see `formwithjkqtplotter.ui`):
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In addition the example implements some simple functionality in the `formwithjkqtplotter.cpp/.h`-files. A single graph, which parses and plots a function (from a `QLineEdit`) is added to the plot in the constructor:
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```.cpp
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#include "formwithjkqtplotter.h"
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#include "ui_formwithjkqtplotter.h"
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FormWithJKQTPlotter::FormWithJKQTPlotter(QWidget *parent) :
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QWidget(parent),
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ui(new Ui::FormWithJKQTPlotter)
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{
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ui->setupUi(this);
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graph=new JKQTPXParsedFunctionLineGraph(ui->plot);
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graph->setFunction(ui->edtEquation->text());
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graph->setTitle(ui->edtEquation->text());
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ui->plot->addGraph(graph);
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ui->plot->setXY(-10,10,-10,10);
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}
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```
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Then three slots react to user interactions. First two interactions set the x- or y-axis to linear or logarithmic, depending on the state of the two check-boxes. It also sets the scaling of the axes to meaningful default values:
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```.cpp
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void FormWithJKQTPlotter::on_chkLogX_toggled(bool checked)
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{
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ui->plot->getXAxis()->setLogAxis(checked);
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if (checked) {
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ui->plot->setX(1e-3,10);
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} else {
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ui->plot->setX(-10,10);
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}
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}
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void FormWithJKQTPlotter::on_chkLogY_toggled(bool checked)
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{
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ui->plot->getYAxis()->setLogAxis(checked);
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if (checked) {
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ui->plot->setY(1e-3,10);
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} else {
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ui->plot->setY(-10,10);
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}
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}
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```
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A third slot is connected to the `clicked()`-event of the `QPushButton` labeled "REPLOT!". This slot reads the function from the `QLineEdit` and updates the plot with it:
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```.cpp
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void FormWithJKQTPlotter::on_btnReplot_clicked()
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{
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graph->setFunction(ui->edtEquation->text());
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graph->setTitle(ui->edtEquation->text());
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ui->plot->redrawPlot();
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}
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```
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The result looks like this:
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If you set both axes to logarithmic and modify the plotted function a bit, you get:
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