Added in API level 21

MeteringRectangle

class MeteringRectangle
kotlin.Any
   ↳ android.hardware.camera2.params.MeteringRectangle

An immutable class to represent a rectangle (x, y, width, height) with an additional weight component.

The rectangle is defined to be inclusive of the specified coordinates.

When used with a CaptureRequest, the coordinate system is based on the active pixel array, with (0,0) being the top-left pixel in the active pixel array, and (android.sensor.info.activeArraySize.width - 1, android.sensor.info.activeArraySize.height - 1) being the bottom-right pixel in the active pixel array.

The weight must range from {@value #METERING_WEIGHT_MIN} to {@value #METERING_WEIGHT_MAX} inclusively, and represents a weight for every pixel in the area. This means that a large metering area with the same weight as a smaller area will have more effect in the metering result. Metering areas can partially overlap and the camera device will add the weights in the overlap rectangle.

If all rectangles have 0 weight, then no specific metering area needs to be used by the camera device. If the metering rectangle is outside the used android.scaler.cropRegion returned in capture result metadata, the camera device will ignore the sections outside the rectangle and output the used sections in the result metadata.

Summary

Constants
static Int

Weights set to this value will cause the camera device to ignore this rectangle.
static Int

The maximum value of valid metering weight.
static Int

The minimum value of valid metering weight.
Public constructors
MeteringRectangle(x: Int, y: Int, width: Int, height: Int, meteringWeight: Int)

Create a new metering rectangle.
MeteringRectangle(xy: Point!, dimensions: Size!, meteringWeight: Int)

Create a new metering rectangle.
MeteringRectangle(rect: Rect!, meteringWeight: Int)

Create a new metering rectangle.
Public methods
Boolean
equals(other: Any?)

Indicates whether some other object is "equal to" this one.
Boolean

Compare two metering rectangles to see if they are equal.
Int

Return the height of the rectangle.
Int

Return the metering weight of the rectangle.
Rect!

Convenience method to create a Rect from this metering rectangle.
Size!

Convenience method to create the size from this metering rectangle.
Point!

Convenience method to create the upper-left (X,Y) coordinate as a Point.
Int

Return the width of the rectangle.
Int

Return the X coordinate of the left side of the rectangle.
Int

Return the Y coordinate of the upper side of the rectangle.
Int

Returns a hash code value for the object.
String

Return the metering rectangle as a string representation "(x:%d, y:%d, w:%d, h:%d, wt:%d)" where each %d respectively represents the x, y, width, height, and weight points.

Constants

METERING_WEIGHT_DONT_CARE

Added in API level 21
static val METERING_WEIGHT_DONT_CARE: Int

Weights set to this value will cause the camera device to ignore this rectangle. If all metering rectangles are weighed with 0, the camera device will choose its own metering rectangles.

Value: 0

METERING_WEIGHT_MAX

Added in API level 21
static val METERING_WEIGHT_MAX: Int

The maximum value of valid metering weight.

Value: 1000

METERING_WEIGHT_MIN

Added in API level 21
static val METERING_WEIGHT_MIN: Int

The minimum value of valid metering weight.

Value: 0

Public constructors

MeteringRectangle

Added in API level 21
MeteringRectangle(
    x: Int, 
    y: Int, 
    width: Int, 
    height: Int, 
    meteringWeight: Int)

Create a new metering rectangle.

Parameters
x Int: coordinate >= 0
y Int: coordinate >= 0
width Int: width >= 0
height Int: height >= 0
meteringWeight Int: weight between {@value #METERING_WEIGHT_MIN} and {@value #METERING_WEIGHT_MAX} inclusively
Exceptions
java.lang.IllegalArgumentException if any of the parameters were negative

MeteringRectangle

Added in API level 21
MeteringRectangle(
    xy: Point!, 
    dimensions: Size!, 
    meteringWeight: Int)

Create a new metering rectangle.

The point xy's data is copied; the reference is not retained.

Parameters
xy Point!: a non-null Point with both x,y >= 0
dimensions Size!: a non-null Size with width, height >= 0
meteringWeight Int: weight >= 0
Exceptions
java.lang.IllegalArgumentException if any of the parameters were negative
java.lang.NullPointerException if any of the arguments were null

MeteringRectangle

Added in API level 21
MeteringRectangle(
    rect: Rect!, 
    meteringWeight: Int)

Create a new metering rectangle.

The rectangle data is copied; the reference is not retained.

Parameters
rect Rect!: a non-null rectangle with all x,y,w,h dimensions >= 0
meteringWeight Int: weight >= 0
Exceptions
java.lang.IllegalArgumentException if any of the parameters were negative
java.lang.NullPointerException if any of the arguments were null

Public methods

equals

Added in API level 21
fun equals(other: Any?): Boolean

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

  • It is reflexive: for any non-null reference value x, x.equals(x) should return true.
  • It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
  • It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
  • It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
  • For any non-null reference value x, x.equals(null) should return false.

An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.

Parameters
obj the reference object with which to compare.
Return
Boolean true if this object is the same as the obj argument; false otherwise.

equals

Added in API level 21
fun equals(other: MeteringRectangle!): Boolean

Compare two metering rectangles to see if they are equal. Two weighted rectangles are only considered equal if each of their components (x, y, width, height, weight) is respectively equal.

Parameters
other MeteringRectangle!: Another MeteringRectangle
Return
Boolean true if the metering rectangles are equal, false otherwise

getHeight

Added in API level 21
fun getHeight(): Int

Return the height of the rectangle.

Return
Int height >= 0

getMeteringWeight

Added in API level 21
fun getMeteringWeight(): Int

Return the metering weight of the rectangle.

Return
Int weight >= 0

getRect

Added in API level 21
fun getRect(): Rect!

Convenience method to create a Rect from this metering rectangle.

This strips away the weight from the rectangle.

Return
Rect! a new Rect with non-negative x1, y1, x2, y2

getSize

Added in API level 21
fun getSize(): Size!

Convenience method to create the size from this metering rectangle.

This strips away the X,Y,weight from the rectangle.

Return
Size! a new Size with non-negative width and height

getUpperLeftPoint

Added in API level 21
fun getUpperLeftPoint(): Point!

Convenience method to create the upper-left (X,Y) coordinate as a Point.

Return
Point! a new (x,y) Point with both x,y >= 0

getWidth

Added in API level 21
fun getWidth(): Int

Return the width of the rectangle.

Return
Int width >= 0

getX

Added in API level 21
fun getX(): Int

Return the X coordinate of the left side of the rectangle.

Return
Int x coordinate >= 0

getY

Added in API level 21
fun getY(): Int

Return the Y coordinate of the upper side of the rectangle.

Return
Int y coordinate >= 0

hashCode

Added in API level 21
fun hashCode(): Int

Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by java.util.HashMap.

The general contract of hashCode is:

  • Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
  • If two objects are equal according to the equals method, then calling the hashCode method on each of the two objects must produce the same integer result.
  • It is not required that if two objects are unequal according to the equals method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.
Return
Int a hash code value for this object.

toString

Added in API level 21
fun toString(): String

Return the metering rectangle as a string representation "(x:%d, y:%d, w:%d, h:%d, wt:%d)" where each %d respectively represents the x, y, width, height, and weight points.

Return
String string representation of the metering rectangle