Scene object that has no rendering content of its own.
This type of sprites is typically used for keyboard handlers or shaders-only rendering, e.g. fade in of the entire
screen, etc. Note that shaders must be attached to some scene object but that object doesn't have to be visible for
the shader to render - hence the convenience of using off-screen sprites for screen-wide shader rendering. Off-screen
sprite has its visible flag set to false, XY-coordinate set to (0,0) and its Z-index set to zero. Its dimension
set to CPDim.ZERO and it shape set to CPRect.ZERO as well.
Since this is an off-screen, invisible sprite the method CPSceneObject.render will never
be called. Use CPSceneObject.update callback, if necessary, instead and make sure to
call super.update(...).
CosPlay provides number of built-in sprites. A sprite is a scene objects, visible or off-screen,
that is custom designed for a particular use case. Built-in sprites provide concrete
implementations for the abstract methods in the base CPSceneObject class. Most non-trivial games
will use combination of the built-in sprites and their own ones. Here's the list of the built-in
sprites:
Gets the optional list of shaders attached to this scene object. By default, returns
an empty list. Note that shaders are called regardless of whether the object visible, in camera
frame or invisible.
Gets the optional list of shaders attached to this scene object. By default, returns
an empty list. Note that shaders are called regardless of whether the object visible, in camera
frame or invisible.
Gets current X-coordinate of this object within dimensions of its scene. Note that returned value
is allowed to be outside scene's dimension (e.g. negative value). In such cases, the clipping of the
scene rendering will result in showing only portion or none of the object.
Gets current X-coordinate of this object within dimensions of its scene. Note that returned value
is allowed to be outside scene's dimension (e.g. negative value). In such cases, the clipping of the
scene rendering will result in showing only portion or none of the object.
Gets current Y-coordinate of this object within dimensions of its scene. Note that returned value
is allowed to be outside scene's dimension (e.g. negative value). In such cases, the clipping of the
scene rendering will result in showing only portion or none of the object.
Gets current Y-coordinate of this object within dimensions of its scene. Note that returned value
is allowed to be outside scene's dimension (e.g. negative value). In such cases, the clipping of the
scene rendering will result in showing only portion or none of the object.
Gets Z-index or order to use in rendering of this object. A pixel with higher Z-index visually
overrides the overlapping pixel in the same XY-coordinate with equal or smaller Z-index.
Gets Z-index or order to use in rendering of this object. A pixel with higher Z-index visually
overrides the overlapping pixel in the same XY-coordinate with equal or smaller Z-index.
It is reflexive: for any instance x of type Any, x.equals(x) should return true.
It is symmetric: for any instances x and y of type Any, x.equals(y) should return true if and
only if y.equals(x) returns true.
It is transitive: for any instances x, y, and z of type Any if x.equals(y) returns true and
y.equals(z) returns true, then x.equals(z) should return true.
If you override this method, you should verify that your implementation remains an equivalence relation.
Additionally, when overriding this method it is usually necessary to override hashCode to ensure that
objects which are "equal" (o1.equals(o2) returns true) hash to the same scala.Int.
(o1.hashCode.equals(o2.hashCode)).
Attributes
that
the object to compare against this object for equality.
Returns:
true if the receiver object is equivalent to the argument; false otherwise.
If object is invisible than only update method will be called
on each frame. If object is visible and in camera frame - method render will be called
as well to render itself. Note that shaders are called regardless of whether the object visible, in camera
frame or invisible.
Called to render this scene object. Only visible and in camera frame objects will receive this
callback. This callback is called on scene object
after all scene objects received update callback. Note that unlike update callbacks
and shaders that are called for all scene objects on each frame, this callback is only called for scene
objects that are visible and, at least partially, in camera frame.
Called to render this scene object. Only visible and in camera frame objects will receive this
callback. This callback is called on scene object
after all scene objects received update callback. Note that unlike update callbacks
and shaders that are called for all scene objects on each frame, this callback is only called for scene
objects that are visible and, at least partially, in camera frame.
Attributes
ctx
Frame context. This context provides bulk of functionality that a scene object
can do in a game, e.g. interact with other scene objects, check collisions, read input
events and manage input focus, add or remove scene objects, add new and switch between scenes, etc.
Called to update the internal state of this scene object. This callback is called each frame on every
object in the scene and it is called before any render callback. Note that all scene object will
receive this callback before first render callback.
Called to update the internal state of this scene object. This callback is called each frame on every
object in the scene and it is called before any render callback. Note that all scene object will
receive this callback before first render callback.
Attributes
ctx
Frame context. This context provides bulk of functionality that a scene object
can do in a game, e.g. interact with other scene objects, check collisions, read input
events and manage input focus, add or remove scene objects, add new and switch between scenes, etc.