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Added in API level 1

Camera

public class Camera
extends Object

java.lang.Object
   ↳ android.graphics.Camera


A camera instance can be used to compute 3D transformations and generate a matrix that can be applied, for instance, on a Canvas.

Summary

Public constructors

Camera()

Creates a new camera, with empty transformations.

Public methods

void applyToCanvas(Canvas canvas)

Computes the matrix corresponding to the current transformation and applies it to the specified Canvas.

float dotWithNormal(float dx, float dy, float dz)
float getLocationX()

Gets the x location of the camera.

float getLocationY()

Gets the y location of the camera.

float getLocationZ()

Gets the z location of the camera.

void getMatrix(Matrix matrix)

Computes the matrix corresponding to the current transformation and copies it to the supplied matrix object.

void restore()

Restores the saved state, if any.

void rotate(float x, float y, float z)

Applies a rotation transform around all three axis.

void rotateX(float deg)

Applies a rotation transform around the X axis.

void rotateY(float deg)

Applies a rotation transform around the Y axis.

void rotateZ(float deg)

Applies a rotation transform around the Z axis.

void save()

Saves the camera state.

void setLocation(float x, float y, float z)

Sets the location of the camera.

void translate(float x, float y, float z)

Applies a translation transform on all three axis.

Protected methods

void finalize()

Invoked when the garbage collector has detected that this instance is no longer reachable.

Inherited methods

From class java.lang.Object

Public constructors

Camera

Added in API level 1
Camera ()

Creates a new camera, with empty transformations.

Public methods

applyToCanvas

Added in API level 1
void applyToCanvas (Canvas canvas)

Computes the matrix corresponding to the current transformation and applies it to the specified Canvas.

Parameters
canvas Canvas: The Canvas to set the transform matrix onto

dotWithNormal

Added in API level 1
float dotWithNormal (float dx, 
                float dy, 
                float dz)

Parameters
dx float
dy float
dz float
Returns
float

getLocationX

Added in API level 16
float getLocationX ()

Gets the x location of the camera.

Returns
float

See also:

getLocationY

Added in API level 16
float getLocationY ()

Gets the y location of the camera.

Returns
float

See also:

getLocationZ

Added in API level 16
float getLocationZ ()

Gets the z location of the camera.

Returns
float

See also:

getMatrix

Added in API level 1
void getMatrix (Matrix matrix)

Computes the matrix corresponding to the current transformation and copies it to the supplied matrix object.

Parameters
matrix Matrix: The matrix to copy the current transforms into

restore

Added in API level 1
void restore ()

Restores the saved state, if any.

See also:

rotate

Added in API level 12
void rotate (float x, 
                float y, 
                float z)

Applies a rotation transform around all three axis.

Parameters
x float: The angle of rotation around the X axis, in degrees
y float: The angle of rotation around the Y axis, in degrees
z float: The angle of rotation around the Z axis, in degrees

See also:

rotateX

Added in API level 1
void rotateX (float deg)

Applies a rotation transform around the X axis.

Parameters
deg float: The angle of rotation around the X axis, in degrees

See also:

rotateY

Added in API level 1
void rotateY (float deg)

Applies a rotation transform around the Y axis.

Parameters
deg float: The angle of rotation around the Y axis, in degrees

See also:

rotateZ

Added in API level 1
void rotateZ (float deg)

Applies a rotation transform around the Z axis.

Parameters
deg float: The angle of rotation around the Z axis, in degrees

See also:

save

Added in API level 1
void save ()

Saves the camera state. Each save should be balanced with a call to restore().

See also:

setLocation

Added in API level 12
void setLocation (float x, 
                float y, 
                float z)

Sets the location of the camera. The default location is set at 0, 0, -8.

Parameters
x float: The x location of the camera
y float: The y location of the camera
z float: The z location of the camera

translate

Added in API level 1
void translate (float x, 
                float y, 
                float z)

Applies a translation transform on all three axis.

Parameters
x float: The distance to translate by on the X axis
y float: The distance to translate by on the Y axis
z float: The distance to translate by on the Z axis

Protected methods

finalize

Added in API level 1
void finalize ()

Invoked when the garbage collector has detected that this instance is no longer reachable. The default implementation does nothing, but this method can be overridden to free resources.

Note that objects that override finalize are significantly more expensive than objects that don't. Finalizers may be run a long time after the object is no longer reachable, depending on memory pressure, so it's a bad idea to rely on them for cleanup. Note also that finalizers are run on a single VM-wide finalizer thread, so doing blocking work in a finalizer is a bad idea. A finalizer is usually only necessary for a class that has a native peer and needs to call a native method to destroy that peer. Even then, it's better to provide an explicit close method (and implement Closeable), and insist that callers manually dispose of instances. This works well for something like files, but less well for something like a BigInteger where typical calling code would have to deal with lots of temporaries. Unfortunately, code that creates lots of temporaries is the worst kind of code from the point of view of the single finalizer thread.

If you must use finalizers, consider at least providing your own ReferenceQueue and having your own thread process that queue.

Unlike constructors, finalizers are not automatically chained. You are responsible for calling super.finalize() yourself.

Uncaught exceptions thrown by finalizers are ignored and do not terminate the finalizer thread. See Effective Java Item 7, "Avoid finalizers" for more.

Throws
Throwable
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