cse1030.drawing

Class Shear

java.lang.Object

cse1030.drawing.Transformation

cse1030.drawing.Shear

public class Shear
extends Transformation

A horizontal shear transformation. A shear transformation transforms a rectangle into a parallelogram. The amount of shear is controlled by a scalar parameter called the shear factor.

Author:

CSE1030Z

Constructor Summary

Constructors

Constructor and Description
Shear(String name, double h) Create a shear transformation given a name and the shear factor h.

Method Summary

Methods

Modifier and Type	Method and Description
Point2D	apply(Point2D p) Apply the shear to a point to produce a new point leaving the original point unchanged.
String	toString() Get a string representation of the shear.
void	transform(Point2D p) Transform a point changing its coordinates.

Methods inherited from class cse1030.drawing.Transformation

getName

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Shear

public Shear(String name,
     double h)

Create a shear transformation given a name and the shear factor h.

Parameters:

name - the name of the transformation

h - the shear factor

Method Detail

transform

public void transform(Point2D p)

Transform a point changing its coordinates. For a shear of of factor h the x and y coordinates of the point are transformed as follows:

x = x + h * y
y = y (i.e., the y coordinate is unchanged)

Specified by:

transform in class Transformation

See Also:

Transformation.transform(cse1030.drawing.Point2D)

Parameters:

p - the point to transform

apply

public Point2D apply(Point2D p)

Apply the shear to a point to produce a new point leaving the original point unchanged.

Specified by:

apply in class Transformation

See Also:

transform(cse1030.drawing.Point2D), Transformation.apply(cse1030.drawing.Point2D)

Parameters:

p - the point to apply the transformation to

Returns:

a new point equal to shearing the input point p

toString

public String toString()

Get a string representation of the shear. The returned string is the name of the shear followed by the string " : shear of factor " followed by the shear factor. For example, a shear of factor 1.876435632 named T1 has the following string representation:

"T1 : shear of factor 1.876435632"

Overrides:

toString in class Transformation

See Also:

Transformation.toString()

Returns:

the string representation of the shear