plasma-framework/widgets/signalplotter.h

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/*
* KSysGuard, the KDE System Guard
*
* Copyright 1999 - 2001 Chris Schlaeger <cs@kde.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef PLASMA_SIGNALPLOTTER_H
#define PLASMA_SIGNALPLOTTER_H
#include <QtGui/QFont>
#include <QtGui/QGraphicsWidget>
#include <plasma/plasma_export.h>
namespace Plasma
{
class SignalPlotterPrivate;
struct PlotColor
{
QColor color;
QColor darkColor;
};
class PLASMA_EXPORT SignalPlotter : public QGraphicsWidget
{
Q_OBJECT
Q_PROPERTY( QString title READ title WRITE setTitle )
Q_PROPERTY( QString unit READ unit WRITE setUnit )
Q_PROPERTY( qreal scale READ scaledBy WRITE scale ) // Note: The naming of the functions here is poor
Q_PROPERTY( bool useAutoRange READ useAutoRange WRITE setUseAutoRange )
Q_PROPERTY( uint horizontalScale READ horizontalScale WRITE setHorizontalScale )
Q_PROPERTY( bool showVerticalLines READ showVerticalLines WRITE setShowVerticalLines )
Q_PROPERTY( QColor verticalLinesColor READ verticalLinesColor WRITE setVerticalLinesColor )
Q_PROPERTY( uint verticalLinesDistance READ verticalLinesDistance WRITE setVerticalLinesDistance )
Q_PROPERTY( bool verticalLinesScroll READ verticalLinesScroll WRITE setVerticalLinesScroll )
Q_PROPERTY( bool showHorizontalLines READ showHorizontalLines WRITE setShowHorizontalLines )
Q_PROPERTY( QColor horizontalLinesColor READ horizontalLinesColor WRITE setHorizontalLinesColor )
Q_PROPERTY( QColor fontColor READ fontColor WRITE setFontColor )
Q_PROPERTY( QFont font READ font WRITE setFont )
Q_PROPERTY( uint horizontalLinesCount READ horizontalLinesCount WRITE setHorizontalLinesCount )
Q_PROPERTY( bool showLabels READ showLabels WRITE setShowLabels )
Q_PROPERTY( bool showTopBar READ showTopBar WRITE setShowTopBar )
Q_PROPERTY( QColor backgroundColor READ backgroundColor WRITE setBackgroundColor )
Q_PROPERTY( QString svgBackground READ svgBackground WRITE setSvgBackground )
Q_PROPERTY( bool thinFrame WRITE setThinFrame )
Q_PROPERTY( bool stackPlots READ stackPlots WRITE setStackPlots )
public:
SignalPlotter(QGraphicsItem *parent = 0);
~SignalPlotter();
/**
* Add a new line to the graph plotter, with the specified color.
* Note that the order you add the plots must be the same order that
* the same data is given in (unless you reorder the plots).
* @param color the color to use for this plot
*/
void addPlot(const QColor &color);
/**
* Add data to the graph, and advance the graph by one time period.
* The data must be given as a list in the same order that the plots were
* added (or consequently reordered).
* @param samples a list with the new value for each plot
*/
void addSample(const QList<double> &samples);
/**
* Reorder the plots into the order given. For example:
* \code
* KSignalPlotter *s = KSignalPlotter(parent);
* s->addPlot(Qt::Blue);
* s->addPlot(Qt::Green);
* QList neworder;
* neworder << 1 << 0;
* reorderPlots(newOrder);
* //Now the order is Green then Blue
* \endcode
* @param newOrder a list with the new position of each plot
*/
void reorderPlots(const QList<uint>& newOrder);
/**
* Removes the plot at the specified index.
* @param pos the index of the plot to be removed
*/
void removePlot(uint pos);
/**
* Return the list of plot colors, in the order that the plots
* were added (or later reordered).
* @return a list containing the color of every plot
*/
QList<PlotColor> &plotColors();
/**
* Set the title of the graph. Drawn in the top left.
* @param title the title to use in the plotter
*/
void setTitle(const QString &title);
/**
* Get the title of the graph. Drawn in the top left.
* @return the title to use in the plotter
*/
QString title() const;
/**
* Set the units. Drawn on the vertical axis of the graph.
* Must be already translated into the local language.
* @param unit the unit string to use
*/
void setUnit(const QString &unit);
/**
* Return the units used on the vertical axis of the graph.
* @return the unit string used
*/
QString unit() const;
/**
* Scale all the values down by the given amount. This is useful
* when the data is given in, say, kilobytes, but you set the
* units as megabytes. Thus you would have to call this with @p value
* set to 1024. This affects all the data already entered.
* @param delta the factor used to scale down the values
*/
void scale(qreal delta);
/**
* Amount scaled down by. @see scale
* @return the factor used to scale down the values
*/
qreal scaledBy() const;
/**
* Set the minimum and maximum values on the vertical axis
* automatically from the data available.
* @param value true if the plotter should calculate its own
* min and max values, otherwise false
*/
void setUseAutoRange(bool value);
/**
* Whether the vertical axis range is set automatically.
* @return true if the plotter calculates its own min and max
* values, otherwise false
*/
bool useAutoRange() const;
/**
* Change the minimum and maximum values drawn on the graph.
* Note that these values are sanitised. For example, if you
* set the minimum as 3, and the maximum as 97, then the graph
* would be drawn between 0 and 100. The algorithm to determine
* this "nice range" attempts to minimize the number of non-zero
* digits.
*
* Use setAutoRange instead to determine the range automatically
* from the data.
* @param min the minimum value to use for the vertical axis
* @param max the maximum value to use for the vertical axis
*/
void setVerticalRange(double min, double max);
/**
* Get the min value of the vertical axis. @see changeRange
* @return the minimum value to use for the vertical axis
*/
double verticalMinValue() const;
/**
* Get the max value of the vertical axis. @see changeRange
* @return the maximum value to use for the vertical axis
*/
double verticalMaxValue() const;
/**
* Set the number of pixels horizontally between data points
* @param scale the number of pixel to draw between two data points
*/
void setHorizontalScale(uint scale);
/**
* The number of pixels horizontally between data points
* @return the number of pixel drawn between two data points
*/
uint horizontalScale() const;
/**
* Whether to draw the vertical grid lines
* @param value true if the lines should be drawn, otherwise false
*/
void setShowVerticalLines(bool value);
/**
* Whether the vertical grid lines will be drawn
* @return true if the lines will be drawn, otherwise false
*/
bool showVerticalLines() const;
/**
* The color of the vertical grid lines
* @param color the color used to draw the vertical grid lines
*/
void setVerticalLinesColor(const QColor &color);
/**
* The color of the vertical grid lines
* @return the color used to draw the vertical grid lines
*/
QColor verticalLinesColor() const;
/**
* The horizontal distance between the vertical grid lines
* @param distance the distance between two vertical grid lines
*/
void setVerticalLinesDistance(uint distance);
/**
* The horizontal distance between the vertical grid lines
* @return the distance between two vertical grid lines
*/
uint verticalLinesDistance() const;
/**
* Whether the vertical lines move with the data
* @param value true if the vertical lines should move with the data
*/
void setVerticalLinesScroll(bool value);
/**
* Whether the vertical lines move with the data
* @return true if the vertical lines will move with the data
*/
bool verticalLinesScroll() const;
/**
* Whether to draw the horizontal grid lines
* @param value true if the lines should be drawn, otherwise false
*/
void setShowHorizontalLines(bool value);
/**
* Whether to draw the horizontal grid lines
* @return true if the lines will be drawn, otherwise false
*/
bool showHorizontalLines() const;
/**
* The color of the horizontal grid lines
* @param color the color used to draw the horizontal grid lines
*/
void setHorizontalLinesColor(const QColor &color);
/**
* The color of the horizontal grid lines
* @return the color used to draw the horizontal grid lines
*/
QColor horizontalLinesColor() const;
/**
* The color of the font used for the axis
* @param color the color used to draw the text of the vertical values
*/
void setFontColor(const QColor &color);
/**
* The color of the font used for the axis
* @return the color used to draw the text of the vertical values
*/
QColor fontColor() const;
/**
* The font used for the axis
* @param font the font used to draw the text of the vertical values
*/
void setFont(const QFont &font);
/**
* The font used for the axis
* @return the font used to draw the text of the vertical values
*/
QFont font() const;
/**
* The number of horizontal lines to draw. Doesn't include the top
* most and bottom most lines.
* @param count the number of horizontal lines to draw
*/
void setHorizontalLinesCount(uint count);
/**
* The number of horizontal lines to draw. Doesn't include the top
* most and bottom most lines.
* @return the number of horizontal lines that will be drawn
*/
uint horizontalLinesCount() const;
/**
* Whether to show the vertical axis labels
* @param value true if the values for the vertical axis should get drawn
*/
void setShowLabels(bool value);
/**
* Whether to show the vertical axis labels
* @return true if the values for the vertical axis will get drawn
*/
bool showLabels() const;
/**
* Whether to show the title etc at the top. Even if set, it
* won't be shown if there isn't room
* @param value true if the topbar should be shown
*/
void setShowTopBar(bool value);
/**
* Whether to show the title etc at the top. Even if set, it
* won't be shown if there isn't room
* @return true if the topbar will be shown
*/
bool showTopBar() const;
/**
* The color to set the background. This might not be seen
* if an svg is also set.
* @param color the color to use for the plotter background
*/
void setBackgroundColor(const QColor &color);
/**
* The color to set the background. This might not be seen
* if an svg is also set.
* @return the color of the plotter background
*/
QColor backgroundColor() const;
/**
* The filename of the svg background. Set to empty to disable
* again.
* @param filename the SVG file to use as a background image
*/
void setSvgBackground(const QString &filename);
/**
* The filename of the svg background. Set to empty to disable
* again.
* @return the file used as a background image
*/
QString svgBackground();
/**
* Return the last value that we have for plot i. Returns 0 if not known.
* @param i the plot we like to have the last value from
* @return the last value of this plot or 0 if not found
*/
double lastValue(uint i) const;
/**
* Return a translated string like: "34 %" or "100 KB" for plot i
* @param i the plot we like to have the value as string from
* @return the last value of this plot as a string
*/
QString lastValueAsString(uint i) const;
/**
* Whether to show a white line on the left and bottom of the widget,
* for a 3D effect
* @param set true if the frame should get drawn
*/
void setThinFrame(bool set);
/**
* Whether to stack the plots on top of each other. The first plot
* added will be at the bottom. The next plot will be drawn on top,
* and so on.
* @param stack true if the plots should be stacked
*/
void setStackPlots(bool stack);
/**
* Whether to stack the plots. @see setStackPlots
* @return true if the plots will be stacked
*/
bool stackPlots() const;
/**
* Render the graph to the specified width and height, and return it
* as an image. This is useful, for example, if you draw a small version
* of the graph, but then want to show a large version in a tooltip etc
* @param width the width of the snapshot
* @param height the height of the snapshot
* @return a snapshot of the plotter as an image
*/
QPixmap getSnapshotImage(uint width, uint height);
/**
* Overwritten to be notified of size changes. Needed to update the
* data buffers that are used to store the samples.
*/
virtual void setGeometry(const QRectF &geometry);
protected:
void updateDataBuffers();
void calculateNiceRange();
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
void drawWidget(QPainter *p, uint w, uint height, int horizontalScale);
void drawBackground(QPainter *p, int w, int h);
void drawThinFrame(QPainter *p, int w, int h);
void drawTopBarFrame(QPainter *p, int separatorX, int height);
void drawTopBarContents(QPainter *p, int x, int width, int height);
void drawVerticalLines(QPainter *p, int top, int w, int h);
void drawPlots(QPainter *p, int top, int w, int h, int horizontalScale);
void drawAxisText(QPainter *p, int top, int h);
void drawHorizontalLines(QPainter *p, int top, int w, int h);
private:
SignalPlotterPrivate *const d;
};
} // Plasma namespace
#endif