Package playn.scene

Class CanvasLayer

java.lang.Object

playn.scene.Layer

playn.scene.ImageLayer

playn.scene.CanvasLayer

All Implemented Interfaces:

AutoCloseable, Closeable

public class CanvasLayer
extends ImageLayer

Simplifies the process of displaying a Canvas which is updated after its initial creation. When modifying the canvas, one must call begin() to obtain a reference to the canvas, do the desired rendering, then call end() to upload the modified image data to the GPU for display by this layer.

Nested Class Summary

Nested classes/interfaces inherited from class playn.scene.Layer

Layer.HitTester, Layer.Origin, Layer.State, Layer.Visitor

Nested classes/interfaces inherited from interface react.Closeable

Closeable.Set, Closeable.Util

Field Summary

Fields inherited from class playn.scene.ImageLayer

forceHeight, forceWidth, region

Fields inherited from class playn.scene.Layer

DEBUG_RECTS, state

Constructor Summary

Constructors

Constructor	Description
CanvasLayer(Graphics gfx, float width, float height)	Creates a canvas layer with a backing canvas of size width x height (in display units).
CanvasLayer(Graphics gfx, Canvas canvas)	Creates a canvas layer with the supplied backing canvas.
CanvasLayer(Graphics gfx, IDimension size)	Creates a canvas layer with a backing canvas of size (in display units).

Method Summary

Modifier and Type	Method	Description
Canvas	begin()	Starts a drawing operation on this layer's backing canvas.
void	close()	Disposes this layer, removing it from its parent layer.
void	end()	Informs this layer that a drawing operation has just completed.
float	height()	Returns the height of this layer.
void	resize(float width, float height)	Resizes the canvas that is displayed by this layer.
ImageLayer	setTile(Tile tile)	Sets the texture rendered by this layer.
ImageLayer	setTile(RFuture<? extends Tile> tile)	Sets the tile rendered by this layer to the asynchronous result of tile.
float	width()	Returns the width of this layer.

Methods inherited from class playn.scene.ImageLayer

setRegion, setSize, setSize, setSource, tile

Methods inherited from class playn.scene.Layer

absorbHits, alpha, debugPrint, depth, disposed, events, hasEventListeners, hitTest, hitTestDefault, interactive, name, onAdded, onDisposed, onRemoved, origin, origin, originX, originY, paint, parent, rotation, scale, scaledHeight, scaledWidth, scaleX, scaleY, setAlpha, setBatch, setDepth, setHitTester, setInteractive, setName, setOrigin, setOrigin, setRotation, setScale, setScale, setScaleX, setScaleY, setTint, setTranslation, setTranslation, setTx, setTy, setVisible, tint, toString, transform, translation, translation, tx, ty, visible, visit

Methods inherited from class java.lang.Object

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

Constructor Details

CanvasLayer

public CanvasLayer(Graphics gfx,
 IDimension size)

Creates a canvas layer with a backing canvas of size (in display units). This layer will display nothing until a begin()/end() pair is used to render something to its backing canvas.

CanvasLayer

public CanvasLayer(Graphics gfx,
 float width,
 float height)

Creates a canvas layer with a backing canvas of size width x height (in display units). This layer will display nothing until a begin()/end() pair is used to render something to its backing canvas.

CanvasLayer

public CanvasLayer(Graphics gfx,
 Canvas canvas)

Creates a canvas layer with the supplied backing canvas. The canvas will immediately be uploaded to the GPU for display.

Method Details

resize

public void resize(float width,
 float height)

Resizes the canvas that is displayed by this layer.

Note: this throws away the old canvas and creates a new blank canvas with the desired size. Thus this should immediately be followed by a begin()/end() pair which updates the contents of the new canvas. Until then, it will display the old image data.

begin

public Canvas begin()

Starts a drawing operation on this layer's backing canvas. Thus must be follwed by a call to end() when the drawing is complete.

end

public void end()

Informs this layer that a drawing operation has just completed. The backing canvas image data is uploaded to the GPU.

setTile

public ImageLayer setTile(Tile tile)

Description copied from class: ImageLayer

Sets the texture rendered by this layer. One can supplied null to release and clear any texture currently being rendered and leave this layer in an uninitialized state. This isn't something one would normally do, but could be useful if one was free-listing image layers for some reason.

Overrides:

setTile in class ImageLayer

setTile

public ImageLayer setTile(RFuture<? extends Tile> tile)

Description copied from class: ImageLayer

Sets the tile rendered by this layer to the asynchronous result of tile. When the future completes, this layer's tile will be set. Until then, the current tile (if any) will continue to be rendered.

Overrides:

setTile in class ImageLayer

width

public float width()

Description copied from class: Layer

Returns the width of this layer. Note: not all layers know their size. Those that don't return 0.

Overrides:

width in class ImageLayer

height

public float height()

Description copied from class: Layer

Returns the height of this layer. Note: not all layers know their size. Those that don't return 0.

Overrides:

height in class ImageLayer

close

public void close()

Description copied from class: Layer

Disposes this layer, removing it from its parent layer. Any resources associated with this layer are freed, and it cannot be reused after being disposed. Disposing a layer that has children will dispose them as well.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class ImageLayer