Overlay (ImageJ API)

java.lang.Object
- ij.gui.Overlay

```
public class Overlay
extends Object
```
An Overlay is a list of ROIs that can be drawn non-destructively on an Image.

Constructor Summary

Constructors
Constructor Description

Overlay()
Constructs an empty Overlay.

Overlay(Roi roi)
Constructs an Overlay and adds the specified ROI.

Constructors
Constructor	Description
`Overlay()`	Constructs an empty Overlay.
`Overlay(Roi roi)`	Constructs an Overlay and adds the specified ROI.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`add(Roi roi)`	Adds an ROI to this Overlay.
`void`	`add(Roi roi, String name)`	Adds an ROI to this Overlay using the specified name.
`void`	`addElement(Roi roi)`	Adds an ROI to this Overlay.
`void`	`clear()`	Removes all the ROIs in this Overlay.
`boolean`	`contains(Roi roi)`	Returns 'true' if this Overlay contains the specified ROI.
`Overlay`	`create()`	Returns a new Overlay that has the same properties as this one.
`void`	`crop(int firstSlice, int lastSlice)`	Removes ROIs having positions outside of the interval defined by firstSlice and lastSlice.
`void`	`crop(int firstC, int lastC, int firstZ, int lastZ, int firstT, int lastT)`	Removes ROIs having a C, Z or T coordinate outside the volume defined by firstC, lastC, firstZ, lastZ, firstT and lastT.
`Overlay`	`crop(Rectangle bounds)`
`void`	`drawBackgrounds(boolean b)`
`void`	`drawLabels(boolean b)`
`void`	`drawNames(boolean b)`
`Overlay`	`duplicate()`	Returns a clone of this Overlay.
`Roi`	`get(int index)`	Returns the ROI with the specified index or null if the index is invalid.
`boolean`	`getDrawBackgrounds()`
`boolean`	`getDrawLabels()`
`boolean`	`getDrawNames()`
`int`	`getIndex(String name)`	Returns the index of the ROI with the specified name, or -1 if not found.
`Color`	`getLabelColor()`
`Font`	`getLabelFont()`
`boolean`	`isCalibrationBar()`
`boolean`	`isSelectable()`	Returns 'true' if ROIs in this overlay can be activated by clicking on their labels or by a long press.
`ResultsTable`	`measure(ImagePlus imp)`	Measures the ROIs in this overlay on the specified image and returns the results as a ResultsTable.
`void`	`remove(int index)`	Removes the ROI with the specified index from this Overlay.
`void`	`remove(Roi roi)`	Removes the specified ROI from this Overlay.
`void`	`remove(String name)`	Removes all ROIs that have the specified name.
`boolean`	`scalableLabels()`
`void`	`selectable(boolean selectable)`	Set 'false' to prevent ROIs in this overlay from being activated by clicking on their labels or by a long clicking.
`void`	`set(Roi roi, int index)`	Replaces the ROI at the specified index.
`void`	`setFillColor(Color color)`	Sets the fill color of all the ROIs in this overlay.
`void`	`setIsCalibrationBar(boolean b)`
`void`	`setLabelColor(Color c)`
`void`	`setLabelFont(Font font)`
`void`	`setLabelFont(Font font, boolean scalable)`
`void`	`setStrokeColor(Color color)`	Sets the stroke color of all the ROIs in this overlay.
`int`	`size()`	Returns the number of ROIs in this Overlay.
`Roi[]`	`toArray()`	Returns on array containing the ROIs in this Overlay.
`String`	`toString()`
`void`	`translate(double dx, double dy)`	Moves all the ROIs in this overlay.
`void`	`translate(int dx, int dy)`	Moves all the ROIs in this overlay.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - Overlay
```
public Overlay()
```
    Constructs an empty Overlay.
  - Overlay
```
public Overlay(Roi roi)
```
    Constructs an Overlay and adds the specified ROI.
- Method Detail
  - add
```
public void add(Roi roi)
```
    Adds an ROI to this Overlay.
  - add
```
public void add(Roi roi,
                String name)
```
    Adds an ROI to this Overlay using the specified name.
  - addElement
```
public void addElement(Roi roi)
```
    Adds an ROI to this Overlay.
  - set
```
public void set(Roi roi,
                int index)
```
    Replaces the ROI at the specified index.
  - remove
```
public void remove(int index)
```
    Removes the ROI with the specified index from this Overlay.
  - remove
```
public void remove(Roi roi)
```
    Removes the specified ROI from this Overlay.
  - remove
```
public void remove(String name)
```
    Removes all ROIs that have the specified name.
  - clear
```
public void clear()
```
    Removes all the ROIs in this Overlay.
  - get
```
public Roi get(int index)
```
    Returns the ROI with the specified index or null if the index is invalid.
  - getIndex
```
public int getIndex(String name)
```
    Returns the index of the ROI with the specified name, or -1 if not found.
  - contains
```
public boolean contains(Roi roi)
```
    Returns 'true' if this Overlay contains the specified ROI.
  - size
```
public int size()
```
    Returns the number of ROIs in this Overlay.
  - toArray
```
public Roi[] toArray()
```
    Returns on array containing the ROIs in this Overlay.
  - setStrokeColor
```
public void setStrokeColor(Color color)
```
    Sets the stroke color of all the ROIs in this overlay.
  - setFillColor
```
public void setFillColor(Color color)
```
    Sets the fill color of all the ROIs in this overlay.
  - translate
```
public void translate(int dx,
                      int dy)
```
    Moves all the ROIs in this overlay.
  - translate
```
public void translate(double dx,
                      double dy)
```
    Moves all the ROIs in this overlay. Marcel Boeglin, October 2013
  - measure
```
public ResultsTable measure(ImagePlus imp)
```
    Measures the ROIs in this overlay on the specified image and returns the results as a ResultsTable.
  - crop
```
public Overlay crop(Rectangle bounds)
```
  - crop
```
public void crop(int firstSlice,
                 int lastSlice)
```
    Removes ROIs having positions outside of the interval defined by firstSlice and lastSlice. Marcel Boeglin, September 2013
  - crop
```
public void crop(int firstC,
                 int lastC,
                 int firstZ,
                 int lastZ,
                 int firstT,
                 int lastT)
```
    Removes ROIs having a C, Z or T coordinate outside the volume defined by firstC, lastC, firstZ, lastZ, firstT and lastT. Marcel Boeglin, September 2013
  - create
```
public Overlay create()
```
    Returns a new Overlay that has the same properties as this one.
  - duplicate
```
public Overlay duplicate()
```
    Returns a clone of this Overlay.
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - drawLabels
```
public void drawLabels(boolean b)
```
  - getDrawLabels
```
public boolean getDrawLabels()
```
  - drawNames
```
public void drawNames(boolean b)
```
  - getDrawNames
```
public boolean getDrawNames()
```
  - drawBackgrounds
```
public void drawBackgrounds(boolean b)
```
  - getDrawBackgrounds
```
public boolean getDrawBackgrounds()
```
  - setLabelColor
```
public void setLabelColor(Color c)
```
  - getLabelColor
```
public Color getLabelColor()
```
  - setLabelFont
```
public void setLabelFont(Font font)
```
  - setLabelFont
```
public void setLabelFont(Font font,
                         boolean scalable)
```
  - getLabelFont
```
public Font getLabelFont()
```
  - setIsCalibrationBar
```
public void setIsCalibrationBar(boolean b)
```
  - isCalibrationBar
```
public boolean isCalibrationBar()
```
  - selectable
```
public void selectable(boolean selectable)
```
    Set 'false' to prevent ROIs in this overlay from being activated by clicking on their labels or by a long clicking.
  - isSelectable
```
public boolean isSelectable()
```
    Returns 'true' if ROIs in this overlay can be activated by clicking on their labels or by a long press.
  - scalableLabels
```
public boolean scalableLabels()
```

Class Overlay

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Overlay

Overlay

Method Detail

add

add

addElement

set

remove

remove

remove

clear

get

getIndex

contains

size

toArray

setStrokeColor

setFillColor

translate

translate

measure

crop

crop

crop

create

duplicate

toString

drawLabels

getDrawLabels

drawNames

getDrawNames

drawBackgrounds

getDrawBackgrounds

setLabelColor

getLabelColor

setLabelFont

setLabelFont

getLabelFont

setIsCalibrationBar

isCalibrationBar

selectable

isSelectable

scalableLabels