org.eclipse.nebula.widgets.oscilloscope.multichannel

Class OscilloscopeDispatcher

java.lang.Object

org.eclipse.nebula.widgets.oscilloscope.multichannel.OscilloscopeDispatcher

public class OscilloscopeDispatcher
extends java.lang.Object

This class keeps the oscilloscope animation running and is used to set various attributes of the scope.

You need to provide an Oscilloscope widget by overriding the getOscilloscope() method. The Control.redraw() method will be called every getDelayLoop() milliseconds. The higher the value, the slower the animation will run.

Just before the redraw and just after the redraw the hook..Draw methods are called. Don't do any expensive calculations there because this will slow down the animation.

Then a counter is incremented and if the counter reaches the getPulse() value, then the hookSetValues(int) method is called. This is you opportunity to provide a value to the scope by calling its setValue or setValues method. The hookSetValues method is only called if the getPulse() value is greater than NO_PULSE

You can also be called back by the widget if it runs out of values by setting a listener in the Oscilloscope#addStackListener(OscilloscopeStackAdapter) method.

If you want to speed up the scope, try overriding the getProgression() method. This will draw the scope this number of times before actually painting.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	OscilloscopeDispatcher.SoundClip Plays a sound clip.

Field Summary

Fields

Modifier and Type	Field and Description
static int[]	BACKGROUND_MONITOR Contains a small image that can serve as the background of the scope.
static int[]	BACKGROUND_MONITOR_SMALL Contains a small image that can serve as the background of the scope.
static int	NO_PULSE This is a special value indicating there is no pulse which means that hookPulse(Oscilloscope, int) will never be called.

Constructor Summary

Constructors

Constructor and Description
OscilloscopeDispatcher() The default constructor.
OscilloscopeDispatcher(int channel)
OscilloscopeDispatcher(int channel, Oscilloscope oscilloscope)
OscilloscopeDispatcher(Oscilloscope oscilloscope)

Method Summary

Modifier and Type	Method and Description
void	dispatch() This method will get the animation going.
protected void	finalize()
org.eclipse.swt.graphics.Color	getActiveForegoundColor() Is used to get the color of the foreground when the thing that the scope is measuring is still alive.
java.io.File	getActiveSoundfile() Override this to return a soundfile that will be played by the dispatcher in the hookPulse(Oscilloscope, int) method if the isSoundRequired() method returns true.
org.eclipse.swt.graphics.Image	getBackgroundImage() Override this to return the background image for the scope.
int	getBaseOffset() Override this to set the offset of the scope line in percentages where 100 is the top of the widget and 0 is the bottom.
int	getChannel() Returns the channel that this scope is the dispatcher for.
int	getDelayLoop() Override this to return a draw delay in milliseconds.
boolean	getFade() Tests if the tail must fade.
org.eclipse.swt.graphics.Color	getInactiveForegoundColor() Is used to get the color of the foreground when the thing that the scope is measuring is not active.
java.io.File	getInactiveSoundfile()
int	getLineWidth()
Oscilloscope	getOscilloscope() This method returns the Oscilloscope.
int	getProgression() Override this to set the number of steps that is calculated before it is actually drawn on the display.
int	getPulse() Returns the heart beat of the scope.
OscilloscopeDispatcher.SoundClip	getSoundClip() Override this to return the Clip player.
int	getSteadyPosition() If the scope value must be drawn on a steady position then this method can supply a value.
int	getTailFade()
int	getTailSize()
void	hookAfterDraw(Oscilloscope oscilloscope, int counter) Is called just after the widget is redrawn every getDelayLoop() milliseconds.
void	hookBeforeDraw(Oscilloscope oscilloscope, int counter) Is called just before the widget is redrawn every getDelayLoop() milliseconds.
void	hookChangeAttributes() This method sets the values in the scope by calling the individual value methods in the dispatcher.
void	hookPulse(Oscilloscope oscilloscope, int pulse) This method is called every time the dispatcher reaches the getPulse() counter.
void	hookSetValues(int pulse) This method will be called every getPulse() times the scope is redrawn which will occur every getDelayLoop() milliseconds (if your hardware is capable of doing so).
void	init() Will be called only once.
boolean	isPercentage() Indicates if the value that comes in from the scope is a percentage rather than an absolute value.
boolean	isRunning()
boolean	isServiceActive() A helper method to indicate if something that you are measuring is active.
boolean	isSoundRequired() The dispatcher is able to beep and pling and this method helps in indicating if this is required.
boolean	isSteady()
boolean	isTailSizeMax()
boolean	mustConnect()
void	setActiveForegoundColor(org.eclipse.swt.graphics.Color color) Is used to get the color of the foreground when the thing that the scope is measuring is still alive.
void	setInactiveForegoundColor(org.eclipse.swt.graphics.Color color) Is used to get the color of the foreground when the thing that the scope is measuring is still alive.
void	setOscilloscope(Oscilloscope scope) This method sets the Oscilloscope.
void	stop() Will stop the animation.
(package private) void	updateBackgroundImage()

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

BACKGROUND_MONITOR

public static final int[] BACKGROUND_MONITOR

Contains a small image that can serve as the background of the scope.

BACKGROUND_MONITOR_SMALL

public static final int[] BACKGROUND_MONITOR_SMALL

Contains a small image that can serve as the background of the scope.

NO_PULSE

public static final int NO_PULSE

This is a special value indicating there is no pulse which means that hookPulse(Oscilloscope, int) will never be called.

See Also:

getPulse(), Constant Field Values

Constructor Detail

OscilloscopeDispatcher

public OscilloscopeDispatcher(int channel)

Parameters:

channel -

See Also:

getChannel()

OscilloscopeDispatcher

public OscilloscopeDispatcher()

The default constructor.

OscilloscopeDispatcher

public OscilloscopeDispatcher(int channel,
                              Oscilloscope oscilloscope)

Parameters:

channel -

oscilloscope -

See Also:

getChannel(), getOscilloscope()

OscilloscopeDispatcher

public OscilloscopeDispatcher(Oscilloscope oscilloscope)

Parameters:

oscilloscope -

See Also:

getOscilloscope()

Method Detail

dispatch

public void dispatch()

This method will get the animation going. It will create a runnable that will be dispatched to the user interface thread. The runnable increments a counter that leads to the getPulse() value and if this is reached then the counter is reset. The counter is passed to the hook methods so that they can prepare for the next pulse.

After the hook methods are called, the runnable is placed in the user interface thread with a timer of getDelayLoop() milliseconds. However, if the delay loop is set to 1, it will dispatch using Display.asyncExec(Runnable) for maximum speed.

This method is not meant to be overridden, override init() hookBeforeDraw(Oscilloscope, int), hookAfterDraw(Oscilloscope, int) and hookPulse(Oscilloscope, int).

finalize

protected void finalize()
                 throws java.lang.Throwable

Overrides:

finalize in class java.lang.Object

Throws:

java.lang.Throwable

getActiveForegoundColor

public org.eclipse.swt.graphics.Color getActiveForegoundColor()

Is used to get the color of the foreground when the thing that the scope is measuring is still alive. The aliveness of the thing that is being measured is returned by the isServiceActive() method. The result of this method will be used in the Control.setForeground(Color) method.

Returns:

the system color green.

See Also:

getInactiveForegoundColor(), getActiveForegoundColor(), setActiveForegoundColor(Color), Control.setForeground(Color)

setActiveForegoundColor

public void setActiveForegoundColor(org.eclipse.swt.graphics.Color color)

Is used to get the color of the foreground when the thing that the scope is measuring is still alive. The aliveness of the thing that is being measured is returned by the isServiceActive() method. The result of this method will be used in the Control.setForeground(Color) method.

Parameters:

color - the new color.

See Also:

getInactiveForegoundColor(), getActiveForegoundColor(), getActiveForegoundColor()

getActiveSoundfile

public java.io.File getActiveSoundfile()

Override this to return a soundfile that will be played by the dispatcher in the hookPulse(Oscilloscope, int) method if the isSoundRequired() method returns true.

Returns:

null. Override to return a file that can be played by your sound hardware.

getBackgroundImage

public org.eclipse.swt.graphics.Image getBackgroundImage()

Override this to return the background image for the scope.

Returns:

the image stored in BACKGROUND_MONITOR. Override to supply your own Image.

getBaseOffset

public int getBaseOffset()

Override this to set the offset of the scope line in percentages where 100 is the top of the widget and 0 is the bottom.

Returns:

Oscilloscope.BASE_CENTER which positions in the center. Override for other values.

stop

public void stop()

Will stop the animation.

getSoundClip

public OscilloscopeDispatcher.SoundClip getSoundClip()

Override this to return the Clip player.

Overriding this method is not expected.

Returns:

the PlayClip object

getDelayLoop

public int getDelayLoop()

Override this to return a draw delay in milliseconds. The scope will progress getProgression() steps.

Returns:

30 milliseconds. Override with a smaller value for more speed.

getFade

public boolean getFade()

Tests if the tail must fade.

Returns:

this default implementation returns true

See Also:

Oscilloscope.setTailFade(int, int), getTailSize()

getInactiveForegoundColor

public org.eclipse.swt.graphics.Color getInactiveForegoundColor()

Is used to get the color of the foreground when the thing that the scope is measuring is not active. The aliveness of the thing that is being measured is returned by the isServiceActive() method. The result of this method will be used in the Control.setForeground(Color) method.

Returns:

the system color red, override if you want to control the inactive foreground color

See Also:

setInactiveForegoundColor(Color), getActiveForegoundColor(), setActiveForegoundColor(Color), Control.setForeground(Color)

setInactiveForegoundColor

public void setInactiveForegoundColor(org.eclipse.swt.graphics.Color color)

Is used to get the color of the foreground when the thing that the scope is measuring is still alive. The aliveness of the thing that is being measured is returned by the isServiceActive() method. The result of this method will be used in the Control.setForeground(Color) method.

Parameters:

color - the new color.

See Also:

getInactiveForegoundColor(), getActiveForegoundColor(), setActiveForegoundColor(Color), Control.setForeground(Color)

getInactiveSoundfile

public java.io.File getInactiveSoundfile()

Returns:

this default implementation returns null

getLineWidth

public int getLineWidth()

Returns:

this default implementation returns 1

getOscilloscope

public Oscilloscope getOscilloscope()

This method returns the Oscilloscope.

Returns:

the oscilloscope

isRunning

public boolean isRunning()

Returns:

true if the dispatcher is running.

See Also:

dispatch(), stop()

setOscilloscope

public void setOscilloscope(Oscilloscope scope)

This method sets the Oscilloscope.

Parameters:

scope -

getProgression

public int getProgression()

Override this to set the number of steps that is calculated before it is actually drawn on the display. This will make the graphic look more jumpy for slower/higher delay rates but you can win speed at faster/lower delay rates. There will be getProgression() values consumed so make sure that the value stack contains enough entries.

If the getDelayLoop() is 10 and the getPulse() is 1 and the getProgression() is 5 then every 10 milliseconds the graph will have progressed 5 pixels. If you want to avoid gaps in your graph, you need to input 5 values every time you reach hookSetValues(int). If the getPulse() is 3, you need to input 15 values for a gapless graph. Alternatively, you can implement a stack listener in the scope to let it call you in case it runs out of values.

Returns:

1. Override and increment for more speed. Must be higher then zero.

getPulse

public int getPulse()

Returns the heart beat of the scope.

Returns:

this default implementation returns 1

See Also:

dispatch(), getDelayLoop(), getProgression()

getSteadyPosition

public int getSteadyPosition()

If the scope value must be drawn on a steady position then this method can supply a value.

Returns:

the default implementation returns 200

See Also:

Oscilloscope.setSteady(int, boolean, int)

getTailFade

public int getTailFade()

Returns:

the percentage of the tail that must fade.

See Also:

Oscilloscope.setTailFade(int, int)

getTailSize

public int getTailSize()

Returns:

the tail size

See Also:

Oscilloscope.setTailSize(int, int)

getChannel

public int getChannel()

Returns the channel that this scope is the dispatcher for. Please note that you do not really need one dispatcher per channel.

Returns:

the channel for this dispatcher. Can be -1 if not set.

hookAfterDraw

public void hookAfterDraw(Oscilloscope oscilloscope,
                          int counter)

Is called just after the widget is redrawn every getDelayLoop() milliseconds. The pulse counter will be set to zero when it reaches getPulse().

Parameters:

oscilloscope -

counter -

hookBeforeDraw

public void hookBeforeDraw(Oscilloscope oscilloscope,
                           int counter)

Is called just before the widget is redrawn every getDelayLoop() milliseconds. It will also call the hookChangeAttributes() method if the number of times this method is called matches the getPulse() value. The pulse counter will be set to zero when it reaches getPulse().

If you override this method, don't forget to call hookChangeAttributes() every now and then.

Parameters:

oscilloscope -

counter -

hookChangeAttributes

public void hookChangeAttributes()

This method sets the values in the scope by calling the individual value methods in the dispatcher. Be aware that this method actually calls some candy so you might want to call super.

hookPulse

public void hookPulse(Oscilloscope oscilloscope,
                      int pulse)

This method is called every time the dispatcher reaches the getPulse() counter. This method plays the active or inactive sound if so required. If you do not want the sounds to play, either disable sounds by not overriding the isSoundRequired() method or override this method.

Parameters:

oscilloscope -

pulse -

hookSetValues

public void hookSetValues(int pulse)

This method will be called every getPulse() times the scope is redrawn which will occur every getDelayLoop() milliseconds (if your hardware is capable of doing so). The scope will progress one pixel every getDelayLoop() milliseconds and will draw the next value from the queue of the scope. If the scope is out of values it will progress one pixel without a value (draw a pixel at his center).

If the delay loop is 10 and the pulse is 20, you have an opportunity to set a value in the scope every 200 milliseconds. In this time the scope will have progressed 20 pixels. If you supply 10 values by calling the setValue(int) 10 times or if you call the setValues(int[]) with 10 ints then you will see 10 pixels of movement and a straight line of 10 pixels.

If the setPulse method is not overridden or if you supply NO_PULSE then this method will not be called unless you override the dispatch method (not recommended). To still set values in the scope you can set a stack listener in the widget that will be called when there are no more values in the stack. Alternatively you can set the return value of getPulse() to 1 so you have the opportunity to provide a value every cycle.

Parameters:

pulse -

See Also:

Oscilloscope#setValue(int), Oscilloscope#setValues(int[]), Oscilloscope#addStackListener(OscilloscopeStackAdapter)

init

public void init()

Will be called only once.

isPercentage

public boolean isPercentage()

Indicates if the value that comes in from the scope is a percentage rather than an absolute value.

Returns:

the default implementation returns true

See Also:

Oscilloscope.setPercentage(int, boolean)

isServiceActive

public boolean isServiceActive()

A helper method to indicate if something that you are measuring is active. Based on the output of this method things can be done, like playing a flat-line sound, changing the foreground color and such.

Returns:

the default implementation returns true

isSoundRequired

public boolean isSoundRequired()

The dispatcher is able to beep and pling and this method helps in indicating if this is required.

Returns:

this default implementation returns false

See Also:

Oscilloscope.setSteady(int, boolean, int)

isSteady

public boolean isSteady()

Returns:

this default implementation returns false

See Also:

Oscilloscope.setSteady(int, boolean, int)

isTailSizeMax

public boolean isTailSizeMax()

Returns:

this default implementation returns false.

See Also:

Oscilloscope.setTailSize(int, int)

mustConnect

public boolean mustConnect()

Returns:

this default implementation returns false

See Also:

Oscilloscope.setConnect(int, boolean)

updateBackgroundImage

void updateBackgroundImage()