class Circle

A Circle is a kind of Shape which is a kind of Node which is a kind of Object. Other Shapes are Rectangle and Line, which we will see later in these notes.

Another type of Node is a Parent. More on this in another chapter.

Here are some of the Circle constructors. For details, look at the Oracle documentation.

Circle()
    Create an empty instance of Circle.

Circle( double radius )
    Create a Circle with a specified radius. 
    The default fill color is black. The default stroke color is null.

Circle(double centerX, double centerY, double radius)
    Create a Circle with a specified position and radius. 
    The default fill color is black. The default stroke color is null.
    
Circle(double centerX, double centerY, double radius, Paint fill)
    Create a Circle with a specified position, radius and fill.
  
Circle(double radius, Paint fill)
   Create a Circle with a specified radius and fill color.

Here are some of the Circle methods. You can construct a Circle object with one of the constructors, and then later on adjust its size, color, and location.

double getCenterX()
    Gets the value of centerX.
    
double getCenterY()
    Gets the value of centerY.

double getRadius()
    Gets the value of the radius.

void setCenterX(double value)
    Sets the value of centerX.

void setCenterY(double value)
    Sets the value of centerY.

void setRadius(double value)
    Sets the value of radius.

Here are some useful methods inherited from Shape:

     
public final void setFill(Paint value)
    Set the color for the fill.

public final Paint getFill()
    Get the color of the fill.

public final void setStroke(Paint value)
    Set the color for the stroke

public final Paint getStroke()
    Get the color of the stroke
    
public final void setStrokeWidth(double value)
    Set the width of the stroke, in pixels
 
public final Paint getStrokeWidth()
    Gets the width of the stroke, in pixels

Notice that Circles are mutable: the instance variables of a Circle object can be changed as a program is running.