HG_REPOSITORIES/LPP/INSTRUMENTATION/USERS/JEANDET/qtcharts Files · doc/src/examples-boxplotchart.qdoc

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Adjust various margins and paddings. The text items have been changed to use QGraphicsTextItem bounding rects instead of calculating dimensions using QFontMetrics. It seems that QGraphicsTextItem boundingRect involves a lot more of a margin than QFontMetrics provided. To compensate, various margins and paddings have been adjusted lower. Change-Id: Idebf939f5dd804fb96daeaea4bbf1b45f4f02908 Reviewed-by: Mika Salmela <mika.salmela@digia.com>

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Mika Salmela A new box-and-whiskers series type added to charts....	r2548	/*!
		\example examples/boxplotchart
		\title Box and Whiskers Example
		\subtitle

Mika Salmela Example finalization and documentation...	r2556	The example shows how to create a box-and-whiskers chart. It also shows how to read the non-continuous data from the file,
		arrange it and find medians needed for box-and-whiskers plotting.
Mika Salmela A new box-and-whiskers series type added to charts....	r2548
Mika Salmela Example finalization and documentation...	r2556	\image examples_boxplotchart.png
Mika Salmela A new box-and-whiskers series type added to charts....	r2548
Mika Salmela Example finalization and documentation...	r2556	To show the share deviation of two companies we start by creating two QBoxPlotSeries to handle monthly data.
Mika Salmela A new box-and-whiskers series type added to charts....	r2548
Mika Salmela Example finalization and documentation...	r2556	\snippet ../examples/boxplotchart/main.cpp 1
Mika Salmela A new box-and-whiskers series type added to charts....	r2548
Mika Salmela Example finalization and documentation...	r2556	QFile class is used to open a text file where the non-continuous data is kept. The BoxDataReader is an auxiliary class for
		reading the text file and finding the extreme and median values from the data. The BoxDataReader is explained in more detail later.
		The method readBox reads the values and sets them to the QBoxSet item which the method returns for the caller. The returned QBoxSet
		item is added to the series.
Mika Salmela A new box-and-whiskers series type added to charts....	r2548
Mika Salmela Example finalization and documentation...	r2556	\snippet ../examples/boxplotchart/main.cpp 2
Mika Salmela A new box-and-whiskers series type added to charts....	r2548
Mika Salmela Example finalization and documentation...	r2556	In this section a second file is opened for reading the data for the second company.
Mika Salmela A new box-and-whiskers series type added to charts....	r2548
Mika Salmela Example finalization and documentation...	r2556	\snippet ../examples/boxplotchart/main.cpp 3
Mika Salmela A new box-and-whiskers series type added to charts....	r2548
Mika Salmela Example finalization and documentation...	r2556	In this code snippet a new QChart instance is created and previously created series are added to it. Also title is defined and
		animation is set to be SeriesAnimation.
Mika Salmela A new box-and-whiskers series type added to charts....	r2548
Mika Salmela Example finalization and documentation...	r2556	\snippet ../examples/boxplotchart/main.cpp 4
Mika Salmela A new box-and-whiskers series type added to charts....	r2548
Mika Salmela Example finalization and documentation...	r2556	Here we ask chart to create default axes for our presentation. We also set range for vertical axis by querying the pointer
		for the axis from the chart and then setting the min and max for that axis.
Mika Salmela A new box-and-whiskers series type added to charts....	r2548
Mika Salmela Example finalization and documentation...	r2556	\snippet ../examples/boxplotchart/main.cpp 5
Mika Salmela A new box-and-whiskers series type added to charts....	r2548
Mika Salmela Example finalization and documentation...	r2556	In this section we set legends visible and place them at the bottom of the chart.
Mika Salmela A new box-and-whiskers series type added to charts....	r2548
Mika Salmela Example finalization and documentation...	r2556	\snippet ../examples/boxplotchart/main.cpp 6
Mika Salmela A new box-and-whiskers series type added to charts....	r2548
Mika Salmela Example finalization and documentation...	r2556	Finally we add the chart onto a view. We also turn on the antialiasing for the chartView.

		\snippet ../examples/boxplotchart/main.cpp 7

		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 ../examples/boxplotchart/main.cpp 8

		Here the method readBox is explained in detail. Firstly a line is read from the file and lines starting with # are rejected
		since they are considered as comment lines.

		\snippet ../examples/boxplotchart/boxdatareader.cpp 1

		On the file the data is arranged as number, space, number, space and so on. On this snippet the line is split into single number strings which
		are stored on QStringList.

		\snippet ../examples/boxplotchart/boxdatareader.cpp 2

		The sortedList will hold the numbers in continuous order and in this code segment we show how to do it. First the sortedList is cleared and numbers
		are read from the strList and stored into sortedList in double format. The qSort method arranges the sortedList into continuous order
		starting from the smallest.

		\snippet ../examples/boxplotchart/boxdatareader.cpp 3

		Here is a code sample how to select extremes and medians from the continuous data. Firstly a new QBoxSet is created.
		Lower and upper extremes are simple to select; they are just first and last items on the sortedList. For medians we use a helper
		method findMedian which is explained later. For the median from the upper half we need to adjust the begin number if
		amount of the numbers is even or uneven. The end number for lower half comes naturally from int rounding.

		\snippet ../examples/boxplotchart/boxdatareader.cpp 4

		Here's the code sample for the method findMedian. If the amount of numbers is uneven we select the number from
		the middle. For even amount numbers we take two numbers from the middle and calculate the mean value.

		\snippet ../examples/boxplotchart/boxdatareader.cpp 5
Mika Salmela A new box-and-whiskers series type added to charts....	r2548	*/

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