org.eclipse.nebula.widgets.oscilloscope
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.Oscilloscope

All Implemented Interfaces:

org.eclipse.swt.graphics.Drawable

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).

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

Author:

Wim.Jongman (@remainsoftware.com)

Nested Class Summary

class

Oscilloscope.IntegerFiFoCircularStack The stack will not overflow if you push too many values into it but it will rotate and overwrite the older values.

Field Summary

static int	BASE_CENTER The base of the line is positioned at the center of the widget.
static int	DEFAULT_HEIGHT The default comfortable widget height.
static int	DEFAULT_TAILFADE The default amount of tail fading in percentages.
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	STEADYPOSITION_75PERCENT Steady position @ 75% of graph.
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

Oscilloscope(org.eclipse.swt.widgets.Composite parent, int style)
Creates a new Oscilloscope.

Method Summary

void	addStackListener(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	getBaseOffset() Gets the relative location where the line is drawn in the widget.
int	getLineWidth()
int	getProgression()
int	getTailFade() gets the percentage of tail that must be faded out.
int	getTailSize() Returns the size of the tail.
boolean	isConnect()
boolean	isFade()
boolean	isPercentage()
boolean	isSteady()
boolean	needsRedraw()
void	removeStackListener(OscilloscopeStackAdapter listener) Removes a stack listener from the collection of stack listeners.
void	setBaseOffset(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(boolean connectHeadAndTail) Connects head and tail only if tail size is TAILSIZE_MAX and no fading.
void	setFade(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	setLineWidth(int lineWidth) Sets the line width.
void	setPercentage(boolean percentage) If set to true then the values are treated as percentages of the available space rather than absolute values.
void	setProgression(int progression) The number of internal steps that must be made before drawing.
void	setSteady(boolean steady, int steadyPosition) If steady is true the graph will draw on a steady position instead of advancing.
void	setTailFade(int tailFade) Sets the percentage of tail that must be faded out.
void	setTailSize(int size) The tail size defaults to TAILSIZE_DEFAULT which is 75% of the width.
void	setValue(int value) Sets a value to be drawn relative to the middle of the widget.
void	setValues(int[] values) Set 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.Scrollable

computeTrim, getClientArea, getHorizontalBar, getVerticalBar

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

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

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

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

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_WIDTH

public static final int DEFAULT_WIDTH

The default comfortable widget width.

See Also:

Constant Field Values

DEFAULT_HEIGHT

public static final int DEFAULT_HEIGHT

The default comfortable widget height.

See Also:

Constant Field Values

DEFAULT_TAILFADE

public static final int DEFAULT_TAILFADE

The default amount of tail fading in percentages.

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.

TAILSIZE_MAX

public static final int TAILSIZE_MAX

Will draw a maximum tail.

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_DEFAULT

public static final int TAILSIZE_DEFAULT

The default tail size is 75% of the width.

See Also:

Constant Field Values

STEADYPOSITION_75PERCENT

public static final int STEADYPOSITION_75PERCENT

Steady position @ 75% of graph.

See Also:

Constant Field Values

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

Constructor Detail

Oscilloscope

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

Creates a new Oscilloscope.

Parameters:

parent -

style -

Method Detail

getTailSize

public int getTailSize()

Returns the size of the tail.

Returns:

int

See Also:

setTailSize(int), TAILSIZE_DEFAULT, TAILSIZE_FILL, TAILSIZE_MAX

getBaseOffset

public int getBaseOffset()

Gets the relative location where the line is drawn in the widget.

Returns:

baseOffset

setBaseOffset

public void setBaseOffset(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.

Parameters:

baseOffset - must be between 0 and 0, exceeding values are rounded to the closest allowable value.

getBase

public int getBase()

Returns:

the base of the line

getProgression

public int getProgression()

Returns:

the number of internal calculation steps at each draw request.

See Also:

setProgression(int)

setProgression

public void setProgression(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.

Parameters:

progression -

isConnect

public boolean isConnect()

Returns:

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

setConnect

public void setConnect(boolean connectHeadAndTail)

Connects head and tail only if tail size is TAILSIZE_MAX and no fading.

Parameters:

connectHeadAndTail -

isFade

public boolean isFade()

Returns:

boolean fade

See Also:

setFade(boolean)

setFade

public void setFade(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).

Parameters:

fade - true or false

See Also:

setTailFade(int)

getTailFade

public int getTailFade()

gets the percentage of tail that must be faded out.

Returns:

int percentage

See Also:

setFade(boolean)

isSteady

public boolean isSteady()

Returns:

boolean steady indicator

See Also:

setSteady(boolean, int)

setValues

public void setValues(int[] values)

Set a bunch of values that will be drawn. 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.

Parameters:

values -

setValue

public void setValue(int value)

Sets a value to be drawn relative to the middle of the widget. Supply a positive or negative value.

Parameters:

value -

setTailSize

public void setTailSize(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

computeSize

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

Overrides:

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

needsRedraw

public boolean needsRedraw()

setLineWidth

public void setLineWidth(int lineWidth)

Sets the line width. A value equal or below zero is ignored. The default width is 1.

Parameters:

lineWidth -

getLineWidth

public int getLineWidth()

Returns:

int, the width of the line.

See Also:

setLineWidth(int)

setPercentage

public void setPercentage(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.

Parameters:

percentage - true if percentages

isPercentage

public boolean isPercentage()

Returns:

boolean

See Also:

setPercentage(boolean)

setSteady

public void setSteady(boolean steady,
                      int steadyPosition)

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

Parameters:

steady -

steadyPosition -

setTailFade

public void setTailFade(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.

Parameters:

tailFade -

addStackListener

public void addStackListener(OscilloscopeStackAdapter listener)

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

Parameters:

listener -

removeStackListener

public void removeStackListener(OscilloscopeStackAdapter listener)

Removes a stack listener from the collection of stack listeners.

Parameters:

listener -