public class RectangularBackground extends Object implements Background
| Constructor and Description |
|---|
RectangularBackground(int color)
Creates a rectangular background with no border.
|
| Modifier and Type | Method and Description |
|---|---|
void |
apply(GraphicsContext g,
int width,
int height)
Applies the background on a graphics context.
|
boolean |
equals(Object obj)
Indicates whether some other object is "equal to" this one.
|
int |
getColor()
Gets the color.
|
int |
hashCode()
Returns a hash code value for the object.
|
boolean |
isTransparent(int width,
int height)
Tells whether or not this background is transparent.
|
public RectangularBackground(int color)
color - the color.public void apply(GraphicsContext g, int width, int height)
Backgroundapply in interface Backgroundg - the graphics context.width - the width of the background.height - the height of the background.public boolean equals(@Nullable Object obj)
Object
The equals method implements an equivalence relation on non-null object references:
x, x.equals(x)
should return true.
x and y,
x.equals(y) should return true if and only if y.equals(x) returns
true.
x, y, and
z, if x.equals(y) returns true and y.equals(z) returns
true, then x.equals(z) should return true.
x and y, multiple
invocations of x.equals(y) consistently return true or consistently return
false, provided no information used in equals comparisons on the objects is
modified.
x, x.equals(null) should return
false.
The equals method for class Object implements the most discriminating possible
equivalence relation on objects; that is, for any non-null reference values x and
y, this method returns true if and only if x and y refer to the
same object (x == y has the value true).
Note that it is generally necessary to override the hashCode method whenever this method
is overridden, so as to maintain the general contract for the hashCode method, which
states that equal objects must have equal hash codes.
equals in interface Backgroundequals in class Objectobj - the reference object with which to compare.true if this object is the same as the obj argument; false otherwise.Object.hashCode(),
HashMappublic int getColor()
public int hashCode()
ObjectHashMap.
The general contract of hashCode is:
hashCode method must consistently return the same integer, provided no
information used in equals comparisons on the object is modified. This integer need not
remain consistent from one execution of an application to another execution of the same
application.
equals(Object) method, then calling the
hashCode method on each of the two objects must produce the same integer result.
Object.equals(java.lang.Object) method, then calling the hashCode
method on each of the two objects must produce distinct integer results. However, the programmer
should be aware that producing distinct integer results for unequal objects may improve the
performance of hash tables.
As much as is reasonably practical, the hashCode method defined by class Object does
return distinct integers for distinct objects. (This is typically implemented by converting the
internal address of the object into an integer, but this implementation technique is not required
by the JavaTM programming language.)
hashCode in interface BackgroundhashCode in class ObjectObject.equals(java.lang.Object),
System.identityHashCode(java.lang.Object)public boolean isTransparent(int width,
int height)
BackgroundA background is considered as transparent if it does not draw every pixel with maximal opacity when it is applied. If a widget has a transparent background, its parent has to be rendered before the widget.
isTransparent in interface Backgroundwidth - the width of the background.height - the height of the background.true if the background is transparent, false otherwise.