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authorTitta Heikkala <titta.heikkala@digia.com>2014-07-01 07:10:00 +0300
committerTitta Heikkala <titta.heikkala@theqtcompany.com>2014-10-14 13:04:52 +0300
commitc544258484ff4fd5d2b88402fbaa5d154b89a3a2 (patch)
tree7659625abb566dec55d3783ed820b928542d9b2b /src/charts/doc/src/examples-percentbarchart.qdoc
parent76339f714f088645e911cee65bdb66055fe029aa (diff)
Qt Charts project file structure change
Charts repository structure is changed to follow the structure of a Qt Add-On module. The task includes following changes: - All macros and definitions named 'commercial' have been renamed. - Compile errors related to QString and qSort usage have been fixed. - Old demos are moved under examples. The QML examples now support only Qt Quick 2.0, the support for Qt Quick 1 is removed. - The QML examples with multiple views are updated so that they are usable also with touch devices. - Unnecessary version checks are removed from examples. - The build stamp has been removed as it was only meant for Charts development purposes and it's no longer needed. Also development build related debug prints are removed as __DATE__ can't be used for all OS thus it doesn't make much sense. - Documentation structure has been updated based on the new module structure. The raw HTML files have been removed. Demos are combined to examples. - Unnecessary .qdocinc files are no longer needed. The content is moved to the corresponding .cpp files. - The Charts widget designer plugin is updated according to the module change. - The test cases updated according to the project structure change. Tests are added also for version 2.0. - cmake modules generation is not needed with Qt 5.4 and Qt Charts so it's disabled. - The new module name and version are updated to the plugin.qmltypes file. Task-number: QTRD-2844, QTRD-3217, QTRD-3218, QTRD-3277, QTRD-3228, QTRD-2526, QTRD-3233, QTRD-3222 Change-Id: Ib7fb26057cde710ffaf6bc780c8bf52a16f45160 Reviewed-by: Miikka Heikkinen <miikka.heikkinen@theqtcompany.com>
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+/*!
+ \example percentbarchart
+ \title PercentBarChart Example
+ \ingroup qtcharts_examples
+
+ \brief The example shows how to create a simple percent bar chart.
+
+ A percent bar chart shows the data in sets as a percentage of
+ all sets per category.
+
+ Creating percent bar charts is just like creating a regular \l {BarChart Example} {bar chart}, except that for a
+ percent bar charts, we use the QPercentBarSeries api instead of QBarSeries. Also, in the
+ \l {BarChart Example} {bar chart} we used the nice numbers algorithm to make the y-axis numbering look better. With
+ the percent bar chart there is no need for that, because the maximum y-axis value is always 100.
+
+ \image examples_percentbarchart.png
+
+ The barsets are used in same way in all barcharts.
+ To illustrate the difference between various barcharts, we use the same data in all examples.
+ The data visualized by the bar chart is defined by QBarSet instances. Here we create the sets and append data
+ to them. The data is appended here with the << operator. Alternatively the append method could be used.
+
+ \snippet percentbarchart/main.cpp 1
+
+ We create the series and append the barsets to it. The series takes ownership of the barsets. The series groups the data from sets to categories.
+ The first values of each set are grouped together in the first category, the second values in the second category etc.
+
+ \snippet percentbarchart/main.cpp 2
+
+ Here we create the chart object and add the series to it. We set the title of the chart with setTitle, and then turn on animations of the series by calling
+ setAnimationOptions(QChart::SeriesAnimations)
+
+ \snippet percentbarchart/main.cpp 3
+
+ To have categories displayed on axis, we need to create a QBarCategoryAxis for that. Here we create a category axis with a list of categories and
+ set it to be the x-axis of the chart. The chart takes ownership of the axis. For the y-axis we use the default axis, which is created and scaled
+ to series data by calling createDefaultAxes of the chart. Note that createDefaultAxes must be called before we set the category axis.
+ Otherwise the default axis will override the category axis.
+
+ \snippet percentbarchart/main.cpp 4
+
+ We also want to show the legend. To do so, we get the legend pointer from the chart and set it to visible. We also place the legend to bottom of
+ the chart by setting its alignment to Qt::AlignBottom.
+
+ \snippet percentbarchart/main.cpp 5
+
+ Finally we add the chart onto a view. We also turn on the antialiasing for the chartView.
+
+ \snippet percentbarchart/main.cpp 6
+
+ The chart is ready to be shown. We set the chart to be central widget of the window.
+ We also set the size for the chart window and show it.
+
+ \snippet percentbarchart/main.cpp 7
+*/