SpriteElement class
class SpriteElement extends ImgElement { final Coordinate startCoordinate; final Vector nextDelta; final int count; int _frame = 0; factory SpriteElement.horizontalFromUrl(String src, num w, num h, int count, num xDelta, [Coordinate start = const Coordinate()]) { final img = new ImageElement(src, null, null); return new SpriteElement(img, w, h, start, new Vector(xDelta, 0), count); } SpriteElement(ImageElement image, num width, num height, this.startCoordinate, this.nextDelta, this.count) : super(width, height, image); void nextFrame() { setFrame(_frame + 1); } void previousFrame() { setFrame(_frame - 1); } void setFrame(int frame) { _frame = (frame % count); invalidateDraw(); } void _doDraw(CanvasRenderingContext2D ctx) { final int msPerFrame = 1000 ~/ count; final int currentMS = window.performance.webkitNow().toInt(); final int theFrame = (currentMS ~/ msPerFrame) % count; final sourceCoord = startCoordinate + nextDelta * theFrame; final rect = new Box.fromCoordSize(sourceCoord, size); CanvasUtil.drawImage(ctx, _image, rect); } }
Extends
DisposableImpl > AttachableObject > PElement > ImgElement > SpriteElement
Constructors
new SpriteElement(ImageElement image, num width, num height, Coordinate startCoordinate, Vector nextDelta, int count) #
SpriteElement(ImageElement image, num width, num height, this.startCoordinate, this.nextDelta, this.count) : super(width, height, image);
factory SpriteElement.horizontalFromUrl(String src, num w, num h, int count, num xDelta, [Coordinate start = const Coordinate()]) #
factory SpriteElement.horizontalFromUrl(String src, num w, num h, int count, num xDelta, [Coordinate start = const Coordinate()]) { final img = new ImageElement(src, null, null); return new SpriteElement(img, w, h, start, new Vector(xDelta, 0), count); }
Properties
final int count #
final int count;
num height #
num get height => _height;
void set height(num value) { assert(isValidNumber(value)); _height = value; invalidateDraw(); }
final EventRoot<EventArgs> invalidated #
EventRoot<EventArgs> get invalidated => _invalidatedEventHandle;
final Type runtimeType #
A representation of the runtime type of the object.
external Type get runtimeType;
Size size #
Size get size => new Size(_width, _height);
void set size(Size value) { assert(value.isValid); _width = value.width; _height = value.height; invalidateDraw(); }
final Coordinate startCoordinate #
final Coordinate startCoordinate;
Operators
bool operator ==(other) #
The equality operator.
The default behavior for all Object
s is to return true if and
only if this
and
other are the same object.
If a subclass overrides the equality operator it should override
the hashCode
method as well to maintain consistency.
bool operator ==(other) => identical(this, other);
Methods
AffineTransform addTransform() #
AffineTransform addTransform(){ validateNotDisposed(); var tx = new AffineTransform(); _transforms.add(tx); return tx; }
void dispose() #
void dispose(){ if (!_disposed) { // Set disposed_ to true first, in case during the chain of disposal this // gets disposed recursively. this._disposed = true; this.disposeInternal(); } }
void disposeInternal() #
Do not call this method directly. Call dispose
instead.
Subclasses should override this method to implement Disposable
behavior.
void disposeInternal(){ super.disposeInternal(); _invalidatedEventHandle.dispose(); }
void drawCore(CanvasRenderingContext2D ctx) #
void drawCore(CanvasRenderingContext2D ctx){ if(cacheEnabled) { _drawCached(ctx); } else { _drawNormal(ctx); } }
void drawOverride(CanvasRenderingContext2D ctx) #
void drawOverride(CanvasRenderingContext2D ctx) { if(_image.complete) { _doDraw(ctx); } else if(!_waitingOnLoad) { _waitingOnLoad = true; // TODO: some day we'll have a way to remove these cleanly // ...because this handled should be disposed :-/ _image.on.load.add(_onImageLoad); } }
AffineTransform getTransform() #
AffineTransform getTransform() { var tx = new AffineTransform(); _transforms.forEach(tx.concatenate); return tx; }
AffineTransform getTransformToRoot() #
AffineTransform getTransformToRoot(){ var tx = new AffineTransform(); if(_parent != null){ tx.concatenate(_parent.getTransformToRoot()); } tx.concatenate(getTransform()); return tx; }
int hashCode() #
Get a hash code for this object.
All objects have hash codes. Hash codes are guaranteed to be the
same for objects that are equal when compared using the equality
operator ==
. Other than that there are no guarantees about
the hash codes. They will not be consistent between runs and
there are no distribution guarantees.
If a subclass overrides hashCode
it should override the
equality operator as well to maintain consistency.
external int hashCode();
new ImgElement(num width, num height, ImageElement _image, [bool cacheEnabled = false]) #
ImgElement(num width, num height, this._image, [bool cacheEnabled = false]) : super(width, height, cacheEnabled);
factory ImgElement.fromUrl(String src, num w, num h) #
factory ImgElement.fromUrl(String src, num w, num h) { final img = new ImageElement(src, null, null); return new ImgElement(w, h, img); }
void invalidateDraw() #
void invalidateDraw(){ validateNotDisposed(); if(_lastDrawSize != null){ _lastDrawSize = null; _invalidateParent(); } }
void nextFrame() #
void nextFrame() { setFrame(_frame + 1); }
noSuchMethod(String name, List args) #
noSuchMethod
is invoked when users invoke a non-existant method
on an object. The name of the method and the arguments of the
invocation are passed to noSuchMethod
. If noSuchMethod
returns a value, that value becomes the result of the original
invocation.
The default behavior of noSuchMethod
is to throw a
noSuchMethodError
.
external Dynamic noSuchMethod(String name, List args);
const Object() #
Creates a new Object
instance.
Object
instances have no meaningful state, and are only useful
through their identity. An Object
instance is equal to itself
only.
const Object();
new PElement(num _width, num _height, [bool cacheEnabled = false]) #
PElement(this._width, this._height, [this.cacheEnabled = false]);
void previousFrame() #
void previousFrame() { setFrame(_frame - 1); }
void registerParent(ElementParent parent) #
void registerParent(ElementParent parent) { assert(_parent == null); assert(parent != null); _parent = parent; }
void setFrame(int frame) #
void setFrame(int frame) { _frame = (frame % count); invalidateDraw(); }
new SpriteElement(ImageElement image, num width, num height, Coordinate startCoordinate, Vector nextDelta, int count) #
SpriteElement(ImageElement image, num width, num height, this.startCoordinate, this.nextDelta, this.count) : super(width, height, image);
factory SpriteElement.horizontalFromUrl(String src, num w, num h, int count, num xDelta, [Coordinate start = const Coordinate()]) #
factory SpriteElement.horizontalFromUrl(String src, num w, num h, int count, num xDelta, [Coordinate start = const Coordinate()]) { final img = new ImageElement(src, null, null); return new SpriteElement(img, w, h, start, new Vector(xDelta, 0), count); }
String toString() #
Returns a string representation of this object.
external String toString();
void validateNotDisposed() #
void validateNotDisposed() { assert(!_disposed); }