Package org.eclipse.nebula.widgets.oscilloscope.multichannel

Class Oscilloscope

java.lang.Object

org.eclipse.swt.widgets.Widget

org.eclipse.swt.widgets.Control

org.eclipse.swt.widgets.Scrollable

org.eclipse.swt.widgets.Composite

org.eclipse.swt.widgets.Canvas

org.eclipse.nebula.widgets.oscilloscope.multichannel.Oscilloscope

Direct Known Subclasses:

Oscilloscope

public class Oscilloscope
extends org.eclipse.swt.widgets.Canvas

Animated widget that tries to mimic an Oscilloscope. An oscilloscope (also known as a scope, CRO or, an O-scope) is a type of electronic test instrument that allows observation of constantly varying signal voltages, usually as a two-dimensional graph of one or more electrical potential differences using the vertical or 'Y' axis, plotted as a function of time, (horizontal or 'x' axis).

http://en.wikipedia.org/ wiki/Oscilloscope

Author:

Wim.Jongman (@remainsoftware.com)

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	Oscilloscope.IntegerFiFoCircularStack	The stack can hold a limited number of values but will never overflow.

Field Summary

Fields

Modifier and Type	Field	Description
static int	BASE_CENTER	The base of the line is positioned at the center of the widget.
static int	CURSOR_START_DEFAULT	The default cursor starting position.
static int	DEFAULT_HEIGHT	The default comfortable widget height.
static int	DEFAULT_WIDTH	The default comfortable widget width.
static int[]	HEARTBEAT	This set of values will draw a figure that is similar to the heart beat that you see on hospital monitors.
static int	LINE_WIDTH_DEFAULT	The default line width.
static int	PROGRESSION_DEFAULT	The default tail fade percentage
static int	STEADYPOSITION_75PERCENT	Steady position @ 75% of graph.
static int	TAILFADE_DEFAULT	The default amount of tail fading in percentages (25).
static int	TAILFADE_NONE	No tailfade.
static int	TAILFADE_PERCENTAGE	The default tail fade percentage
static int	TAILSIZE_DEFAULT	The default tail size is 75% of the width.
static int	TAILSIZE_FILL	Will draw a tail from the left border but is only valid if the boolean in #setSteady(boolean, int) was set to true, will default to TAILSIZE_MAX otherwise.
static int	TAILSIZE_MAX	Will draw a maximum tail.

Fields inherited from class org.eclipse.swt.widgets.Control

handle

Constructor Summary

Constructors

Constructor	Description
Oscilloscope(int channels, OscilloscopeDispatcher dispatcher, org.eclipse.swt.widgets.Composite parent, int style)	Creates a new scope with channels channels and adds attaches it to the supplied dispatcher.
Oscilloscope(int channels, org.eclipse.swt.widgets.Composite parent, int style)	Creates a scope with channels channels.
Oscilloscope(org.eclipse.swt.widgets.Composite parent, int style)	Creates a scope with one channel.

Method Summary

Modifier and Type	Method	Description
void	addStackListener(int channel, OscilloscopeStackAdapter listener)	Adds a new stack listener to the collection of stack listeners.
org.eclipse.swt.graphics.Point	computeSize(int wHint, int hHint, boolean changed)
int	getBase(int channel)	This method can be called outside of the UI thread.
int	getBaseOffset(int channel)	Gets the relative location where the line is drawn in the widget.
int	getChannels()	This method can be called outside of the UI thread.
OscilloscopeDispatcher	getDispatcher(int channel)	This method can be called outside of the UI thread.
org.eclipse.swt.graphics.Color	getForeground(int channel)	This method can be called outside of the UI thread.
int	getLineWidth(int channel)	This method can be called outside of the UI thread.
int	getProgression(int channel)	This method can be called outside of the UI thread.
int	getTailFade(int channel)	Gets the percentage of tail that must be faded out.
int	getTailSize(int channel)	Returns the size of the tail.
boolean	isAntiAlias(int channel)	This method can be called outside of the UI thread.
boolean	isConnect(int channel)	This method can be called outside of the UI thread.
boolean	isFade(int channel)	This method can be called outside of the UI thread.
boolean	isPercentage(int channel)	This method can be called outside of the UI thread.
boolean	isSteady(int channel)	This method can be called outside of the UI thread.
boolean	needsRedraw()
void	removeStackListener(int channel, OscilloscopeStackAdapter listener)	Removes a stack listener from the collection of stack listeners.
void	setAntialias(int channel, boolean antialias)	Sets if the line must be anti-aliased which uses more processing power in return of a smoother image.
void	setBaseOffset(int channel, int baseOffset)	Gets the relative location where the line is drawn in the widget, the default is BASE_CENTER which is in the middle of the scope.
void	setConnect(int channel, boolean connectHeadAndTail)	Connects head and tail only if tail size is TAILSIZE_MAX and no fading.
void	setDispatcher(int channel, OscilloscopeDispatcher dispatcher)	Sets the dispatcher that is associated with the supplied channel.
void	setFade(int channel, boolean fade)	Sets fade mode so that a percentage of the tail will be faded out at the costs of extra CPU utilization (no beauty without pain or as the Dutch say: "Wie mooi wil gaan moet pijn doorstaan").
void	setForeground(int channel, org.eclipse.swt.graphics.Color color)	Sets the foreground color for the supplied channel.
void	setLineWidth(int channel, int lineWidth)	Sets the line width.
void	setPercentage(int channel, boolean percentage)	If set to true then the values are treated as percentages of the available space rather than absolute values.
void	setProgression(int channel, int progression)	The number of internal steps that must be made before drawing.
void	setSteady(int channel, boolean steady, int steadyPosition)	If steady is true the graph will draw on a steady position instead of advancing.
void	setTailFade(int channel, int tailFade)	Sets the percentage of tail that must be faded out.
void	setTailSize(int channel, int size)	The tail size defaults to TAILSIZE_DEFAULT which is 75% of the width.
void	setValue(int channel, int value)	Sets a value to be drawn relative to the center of the channel.
void	setValues(int channel, int[] values)	Sets a bunch of values that will be drawn.

Methods inherited from class org.eclipse.swt.widgets.Canvas

drawBackground, getCaret, getIME, scroll, setCaret, setFont, setIME

Methods inherited from class org.eclipse.swt.widgets.Composite

changed, drawBackground, getBackgroundMode, getChildren, getLayout, getLayoutDeferred, getTabList, isLayoutDeferred, layout, layout, layout, layout, layout, setBackgroundMode, setFocus, setLayout, setLayoutDeferred, setTabList

Methods inherited from class org.eclipse.swt.widgets.Control

addControlListener, addDragDetectListener, addFocusListener, addGestureListener, addHelpListener, addKeyListener, addMenuDetectListener, addMouseListener, addMouseMoveListener, addMouseTrackListener, addMouseWheelListener, addPaintListener, addTouchListener, addTraverseListener, computeSize, dragDetect, dragDetect, forceFocus, getAccessible, getBackground, getBackgroundImage, getBorderWidth, getBounds, getCursor, getDragDetect, getEnabled, getFont, getForeground, getLayoutData, getLocation, getMenu, getMonitor, getOrientation, getParent, getRegion, getShell, getSize, getTextDirection, getToolTipText, getTouchEnabled, getVisible, internal_dispose_GC, internal_new_GC, isEnabled, isFocusControl, isReparentable, isVisible, moveAbove, moveBelow, pack, pack, print, redraw, redraw, removeControlListener, removeDragDetectListener, removeFocusListener, removeGestureListener, removeHelpListener, removeKeyListener, removeMenuDetectListener, removeMouseListener, removeMouseMoveListener, removeMouseTrackListener, removeMouseWheelListener, removePaintListener, removeTouchListener, removeTraverseListener, requestLayout, setBackground, setBackgroundImage, setBounds, setBounds, setCapture, setCursor, setDragDetect, setEnabled, setForeground, setLayoutData, setLocation, setLocation, setMenu, setOrientation, setParent, setRedraw, setRegion, setSize, setSize, setTextDirection, setToolTipText, setTouchEnabled, setVisible, toControl, toControl, toDisplay, toDisplay, traverse, traverse, traverse, update

Methods inherited from interface org.eclipse.swt.graphics.Drawable

isAutoScalable

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from class org.eclipse.swt.widgets.Scrollable

computeTrim, getClientArea, getHorizontalBar, getScrollbarsMode, getVerticalBar

Methods inherited from class org.eclipse.swt.widgets.Widget

addDisposeListener, addListener, dispose, getData, getData, getDisplay, getListeners, getStyle, isAutoDirection, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, reskin, setData, setData, toString

Field Detail

BASE_CENTER

public static final int BASE_CENTER

The base of the line is positioned at the center of the widget.

See Also:

#setBaseOffset(int), Constant Field Values

CURSOR_START_DEFAULT

public static final int CURSOR_START_DEFAULT

The default cursor starting position.

See Also:

Constant Field Values

DEFAULT_HEIGHT

public static final int DEFAULT_HEIGHT

The default comfortable widget height.

See Also:

Constant Field Values

DEFAULT_WIDTH

public static final int DEFAULT_WIDTH

The default comfortable widget width.

See Also:

Constant Field Values

HEARTBEAT

public static final int[] HEARTBEAT

This set of values will draw a figure that is similar to the heart beat that you see on hospital monitors.

LINE_WIDTH_DEFAULT

public static final int LINE_WIDTH_DEFAULT

The default line width.

See Also:

Constant Field Values

PROGRESSION_DEFAULT

public static final int PROGRESSION_DEFAULT

The default tail fade percentage

See Also:

Constant Field Values

STEADYPOSITION_75PERCENT

public static final int STEADYPOSITION_75PERCENT

Steady position @ 75% of graph.

See Also:

Constant Field Values

TAILFADE_DEFAULT

public static final int TAILFADE_DEFAULT

The default amount of tail fading in percentages (25).

See Also:

Constant Field Values

TAILFADE_NONE

public static final int TAILFADE_NONE

No tailfade.

See Also:

Constant Field Values

TAILFADE_PERCENTAGE

public static final int TAILFADE_PERCENTAGE

The default tail fade percentage

See Also:

Constant Field Values

TAILSIZE_DEFAULT

public static final int TAILSIZE_DEFAULT

The default tail size is 75% of the width.

See Also:

Constant Field Values

TAILSIZE_FILL

public static final int TAILSIZE_FILL

Will draw a tail from the left border but is only valid if the boolean in #setSteady(boolean, int) was set to true, will default to TAILSIZE_MAX otherwise.

See Also:

Constant Field Values

TAILSIZE_MAX

public static final int TAILSIZE_MAX

Will draw a maximum tail.

See Also:

Constant Field Values

Constructor Detail

Oscilloscope

public Oscilloscope(org.eclipse.swt.widgets.Composite parent,
                    int style)

Creates a scope with one channel.

Parameters:

parent -

style -

Oscilloscope

public Oscilloscope(int channels,
                    org.eclipse.swt.widgets.Composite parent,
                    int style)

Creates a scope with channels channels.

Parameters:

channels -

parent -

style -

Oscilloscope

public Oscilloscope(int channels,
                    OscilloscopeDispatcher dispatcher,
                    org.eclipse.swt.widgets.Composite parent,
                    int style)

Creates a new scope with channels channels and adds attaches it to the supplied dispatcher.

Parameters:

channels -

dispatcher - may be null

parent -

style -

Method Detail

addStackListener

public void addStackListener(int channel,
                             OscilloscopeStackAdapter listener)

Adds a new stack listener to the collection of stack listeners. Adding the same listener twice will have no effect.

This method can be called outside of the UI thread.

Parameters:

listener -

computeSize

public org.eclipse.swt.graphics.Point computeSize(int wHint,
                                                  int hHint,
                                                  boolean changed)

Overrides:

computeSize in class org.eclipse.swt.widgets.Control

getBase

public int getBase(int channel)

This method can be called outside of the UI thread.

Returns:

the base of the line.

getBaseOffset

public int getBaseOffset(int channel)

Gets the relative location where the line is drawn in the widget. This method can be called outside of the UI thread.

Returns:

baseOffset

getChannels

public int getChannels()

This method can be called outside of the UI thread.

Returns:

int, number of channels.

getDispatcher

public OscilloscopeDispatcher getDispatcher(int channel)

This method can be called outside of the UI thread.

Parameters:

channel -

Returns:

the dispatcher associated with this channel.

getForeground

public org.eclipse.swt.graphics.Color getForeground(int channel)

This method can be called outside of the UI thread.

Parameters:

channel -

Returns:

the foreground color associated with the supplied channel.

getLineWidth

public int getLineWidth(int channel)

This method can be called outside of the UI thread.

Returns:

int, the width of the line.

See Also:

#setLineWidth(int)

getProgression

public int getProgression(int channel)

This method can be called outside of the UI thread.

Returns:

the number of internal calculation steps at each draw request.

See Also:

#setProgression(int)

getTailFade

public int getTailFade(int channel)

Gets the percentage of tail that must be faded out. This method can be called outside of the UI thread.

Returns:

int percentage

See Also:

#setFade(boolean)

getTailSize

public int getTailSize(int channel)

Returns the size of the tail. This method can be called outside of the UI thread.

Returns:

int

See Also:

#setTailSize(int), TAILSIZE_DEFAULT, TAILSIZE_FILL, TAILSIZE_MAX

isConnect

public boolean isConnect(int channel)

This method can be called outside of the UI thread.

Returns:

boolean, true if the tail and the head of the graph must be connected if tail size is TAILSIZE_MAX no fading graph.

isFade

public boolean isFade(int channel)

This method can be called outside of the UI thread.

Returns:

boolean fade

See Also:

#setFade(boolean)

isPercentage

public boolean isPercentage(int channel)

This method can be called outside of the UI thread.

Returns:

boolean

See Also:

#setPercentage(boolean)

isSteady

public boolean isSteady(int channel)

This method can be called outside of the UI thread.

Returns:

boolean steady indicator

See Also:

Oscilloscope#setSteady(boolean, int)

isAntiAlias

public boolean isAntiAlias(int channel)

This method can be called outside of the UI thread.

Returns:

boolean anti-alias indicator

See Also:

setAntialias(int, boolean)

needsRedraw

public boolean needsRedraw()

removeStackListener

public void removeStackListener(int channel,
                                OscilloscopeStackAdapter listener)

Removes a stack listener from the collection of stack listeners. This method can be called outside of the UI thread.

Parameters:

listener -

setBaseOffset

public void setBaseOffset(int channel,
                          int baseOffset)

Gets the relative location where the line is drawn in the widget, the default is BASE_CENTER which is in the middle of the scope. This method can be called outside of the UI thread.

Parameters:

baseOffset - must be between 100 and -100, exceeding values are rounded to the closest allowable value.

setConnect

public void setConnect(int channel,
                       boolean connectHeadAndTail)

Connects head and tail only if tail size is TAILSIZE_MAX and no fading. This method can be called outside of the UI thread.

Parameters:

connectHeadAndTail -

setAntialias

public void setAntialias(int channel,
                         boolean antialias)

Sets if the line must be anti-aliased which uses more processing power in return of a smoother image. The default value is false. This method can be called outside of the UI thread.

Parameters:

channel -

antialias -

setDispatcher

public void setDispatcher(int channel,
                          OscilloscopeDispatcher dispatcher)

Sets the dispatcher that is associated with the supplied channel. This method can be called outside of the UI thread.

Parameters:

channel -

dispatcher -

setFade

public void setFade(int channel,
                    boolean fade)

Sets fade mode so that a percentage of the tail will be faded out at the costs of extra CPU utilization (no beauty without pain or as the Dutch say: "Wie mooi wil gaan moet pijn doorstaan"). The reason for this is that each pixel must be drawn separately with alpha faded in instead of the elegant GC.drawPolygon(int[]) routine which does not support alpha blending.

In addition to this, set the percentage of tail that must be faded out #setTailFade(int).

This method can be called outside of the UI thread.

Parameters:

fade - true or false

See Also:

#setTailFade(int)

setForeground

public void setForeground(int channel,
                          org.eclipse.swt.graphics.Color color)

Sets the foreground color for the supplied channel.

This method can be called outside of the UI thread.

Parameters:

channel -

color -

setLineWidth

public void setLineWidth(int channel,
                         int lineWidth)

Sets the line width. A value equal or below zero is ignored. The default width is 1. This method can be called outside of the UI thread.

Parameters:

lineWidth -

setPercentage

public void setPercentage(int channel,
                          boolean percentage)

If set to true then the values are treated as percentages of the available space rather than absolute values. This will scale the amplitudes if the control is resized. Default is false.

This method can be called outside of the UI thread.

Parameters:

percentage - true if percentages

setProgression

public void setProgression(int channel,
                           int progression)

The number of internal steps that must be made before drawing. Normally this will slide the graph one pixel. Setting this to a higher value will speed up the animation at the cost of a more jerky motion.

This method can be called outside of the UI thread.

Parameters:

progression -

setSteady

public void setSteady(int channel,
                      boolean steady,
                      int steadyPosition)

If steady is true the graph will draw on a steady position instead of advancing.

This method can be called outside of the UI thread.

Parameters:

steady -

steadyPosition -

setTailFade

public void setTailFade(int channel,
                        int tailFade)

Sets the percentage of tail that must be faded out. If you supply 100 then the tail is faded out all the way to the top. The effect will become increasingly less obvious.

This method can be called outside of the UI thread.

Parameters:

tailFade -

setTailSize

public void setTailSize(int channel,
                        int size)

The tail size defaults to TAILSIZE_DEFAULT which is 75% of the width. Setting it with TAILSIZE_MAX will leave one pixel between the tail and the head. All values are absolute except TAILSIZE*. If the width is smaller then the tail size then the tail size will behave like TAILSIZE_MAX.

Parameters:

size - the size of the tail

See Also:

#getTailSize(), TAILSIZE_DEFAULT, TAILSIZE_FILL, TAILSIZE_MAX

setValue

public void setValue(int channel,
                     int value)

Sets a value to be drawn relative to the center of the channel. Supply a positive or negative value. This method will only accept values if the width of the scope > 0. The values will be stored in a stack and popped once a value is needed. The size of the stack is the width of the widget. If you resize the widget, the old stack will be copied into a new stack with the new capacity.

This method can be called outside of the UI thread.

Parameters:

channel -

value - which is an absolute value or a percentage

See Also:

isPercentage(int), setBaseOffset(int, int)

setValues

public void setValues(int channel,
                      int[] values)

Sets a bunch of values that will be drawn. See setValue(int, int) for details.

This method can be called outside of the UI thread.

Parameters:

channel -

values -

See Also:

setValue(int, int)