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abstract class Bounds! Or interface?...

public Bounds unite(Bounds anotherBounds)
You have to developed this idea and maybe include some abilities and transformations to/from javafx.geometry.Bounds.

Also there must be RectangularBounds, CircleBounds and maybe some other subclasses.

SpriteAnimation class

Must provide next API:
public SpriteAnimation() {
images = null;
currentImg = -1;
imageCount = 0;
window = new ImageView();
}

public SpriteAnimation(Image[] images) {
	setImages(images);
	window = new ImageView();		
}

public void setImages(Image[] images) {
	this.images = images;
	imageCount = images.length;
	currentImg = imageCount/2;		
}

public SpriteAnimation(Image[] images, int initialImg) {
	this.images = images;
	imageCount = images.length;
	currentImg = initialImg;
	window = new ImageView();
}

public void bindToParent(Pane parent) {
	parent.getChildren().add(window);
}

public boolean removeFromParent(Pane parent) {
	return parent.getChildren().remove(window);
}

public void setWindowPosition(Vector position) {
	window.setX(position.x);
	window.setY(position.y);
}

public void flipForward() {
	currentImg++;
	if (currentImg == imageCount) {
		currentImg = 0;
	}
}

public void flipBack() {
	currentImg--;
	if (currentImg < 0) {
		currentImg = imageCount-1;
	}
}

public int getFlipCount() {
	return images.length;
}

public boolean isFirstFlip() {
	return currentImg == 0;
}

public boolean isLastFlip() {
	return currentImg == imageCount-1;
}

public boolean isCentralFlip() {
	return currentImg == imageCount/2;
}

public void redraw() {
	window.setImage(images[currentImg]);
}

public double getWidth();

public double getHeight();