Class ShapeUtilities

public static Shape clone(Shape shape)

Returns a clone of the specified shape, or null. At the current time, this method supports cloning for instances of Line2D, RectangularShape, Area and GeneralPath.

RectangularShape includes Arc2D, Ellipse2D, Rectangle2D, RoundRectangle2D.

Parameters:

shape - the shape to clone (null permitted, returns null).

Returns:

A clone or null.

public static boolean contains(Rectangle2D rect1,
                               Rectangle2D rect2)

Checks, whether the given rectangle1 fully contains rectangle 2 (even if rectangle 2 has a height or width of zero!).

Parameters:

rect1 - the first rectangle.

rect2 - the second rectangle.

Returns:

A boolean.

public static Shape createDiagonalCross(float l,
                                        float t)

Creates a diagonal cross shape.

Parameters:

l - the length of each 'arm'.

t - the thickness.

Returns:

A diagonal cross shape.

public static Shape createDiamond(float s)

Creates a diamond shape.

Parameters:

s - the size factor (equal to half the height of the diamond).

Returns:

A diamond shape.

public static Shape createDownTriangle(float s)

Creates a triangle shape that points downwards.

Parameters:

s - the size factor (equal to half the height of the triangle).

Returns:

A triangle shape.

public static Shape createLineRegion(Line2D line,
                                     float width)

Creates a region surrounding a line segment by 'widening' the line segment. A typical use for this method is the creation of a 'clickable' region for a line that is displayed on-screen.

Parameters:

line - the line (null not permitted).

width - the width of the region.

Returns:

A region that surrounds the line.

public static Shape createRegularCross(float l,
                                       float t)

Creates a diagonal cross shape.

Parameters:

l - the length of each 'arm'.

t - the thickness.

Returns:

A diagonal cross shape.

public static Shape createTranslatedShape(Shape shape,
                                          double transX,
                                          double transY)

Creates and returns a translated shape.

Parameters:

shape - the shape (null not permitted).

transX - the x translation (in Java2D space).

transY - the y translation (in Java2D space).

Returns:

The translated shape.

public static Shape createTranslatedShape(Shape shape,
                                          RectangleAnchor anchor,
                                          double locationX,
                                          double locationY)

Translates a shape to a new location such that the anchor point (relative to the rectangular bounds of the shape) aligns with the specified (x, y) coordinate in Java2D space.

Parameters:

shape - the shape (null not permitted).

anchor - the anchor (null not permitted).

locationX - the x-coordinate (in Java2D space).

locationY - the y-coordinate (in Java2D space).

Returns:

A new and translated shape.

public static Shape createUpTriangle(float s)

Creates a triangle shape that points upwards.

Parameters:

s - the size factor (equal to half the height of the triangle).

Returns:

A triangle shape.

public static void drawRotatedShape(Graphics2D g2,
                                    Shape shape,
                                    double angle,
                                    float x,
                                    float y)

Draws a shape with the specified rotation about (x, y).

Parameters:

g2 - the graphics device (null not permitted).

shape - the shape (null not permitted).

angle - the angle (in radians).

x - the x coordinate for the rotation point.

y - the y coordinate for the rotation point.

public static boolean equal(Arc2D a1,
                            Arc2D a2)

Compares two arcs and returns true if they are equal or both null.

Parameters:

a1 - the first arc (null permitted).

a2 - the second arc (null permitted).

Returns:

A boolean.

public static boolean equal(Ellipse2D e1,
                            Ellipse2D e2)

Compares two ellipses and returns true if they are equal or both null.

Parameters:

e1 - the first ellipse (null permitted).

e2 - the second ellipse (null permitted).

Returns:

A boolean.

public static boolean equal(GeneralPath p1,
                            GeneralPath p2)

Tests two polygons for equality. If both are null this method returns true.

Parameters:

p1 - path 1 (null permitted).

p2 - path 2 (null permitted).

Returns:

A boolean.

public static boolean equal(Line2D l1,
                            Line2D l2)

Compares two lines are returns true if they are equal or both null.

Parameters:

l1 - the first line (null permitted).

l2 - the second line (null permitted).

Returns:

A boolean.

public static boolean equal(Polygon p1,
                            Polygon p2)

Tests two polygons for equality. If both are null this method returns true.

Parameters:

p1 - polygon 1 (null permitted).

p2 - polygon 2 (null permitted).

Returns:

A boolean.

public static boolean equal(Shape s1,
                            Shape s2)

Tests two shapes for equality. If both shapes are null, this method will return true.

In the current implementation, the following shapes are supported: Ellipse2D, Line2D and Rectangle2D (implicit).

Parameters:

s1 - the first shape (null permitted).

s2 - the second shape (null permitted).

Returns:

A boolean.

public static Point2D getPointInRectangle(double x,
                                          double y,
                                          Rectangle2D area)

Returns a point based on (x, y) but constrained to be within the bounds of a given rectangle.

Parameters:

x - the x-coordinate.

y - the y-coordinate.

area - the constraining rectangle (null not permitted).

Returns:

A point within the rectangle.

public static boolean intersects(Rectangle2D rect1,
                                 Rectangle2D rect2)

Checks, whether the given rectangle1 fully contains rectangle 2 (even if rectangle 2 has a height or width of zero!).

Parameters:

rect1 - the first rectangle.

rect2 - the second rectangle.

Returns:

A boolean.

public static Shape rotateShape(Shape base,
                                double angle,
                                float x,
                                float y)

Rotates a shape about the specified coordinates.

Parameters:

base - the shape (null permitted, returns null).

angle - the angle (in radians).

x - the x coordinate for the rotation point (in Java2D space).

y - the y coordinate for the rotation point (in Java2D space).

Returns:

the rotated shape.