CS 185
Fall 2003
Professor J. L. Sibert

Assignment 3
Assigned: September 29 Due: October 13

Write and test a class to perform 2 dimensional geometric transformations.
The specification for the class is given below:

// class for geometric transforms
public class MyXform {

// instance variables

// constructors
public MyXform () {} // default constructor equivalent to identity matrix

// methods

//reset this MyXform to a Translate
public void setTranslate (double tx, double ty) {}

// reset this MyXform to a Scale
public void setScale (double sx, double sy){}

// reset this MyXform to a Rotate
public void setRotate (double theta){}

// if this MyXform is A , and in is B this method should do A = B•A
public void preCompose (MyXform in){}

// apply this MyXform to a point--useful  for implementing the rest of the assignment
public MyPoint2d apply(MyPoint2d in);

}// end class Xform definition

In addition,  you should write a MyPolygon class

//constructor

public MyPolygon(MyPoint2d verts[], int npts)

//render
public void render(Graphics g, MyView v)

//apply
public void apply (MyXform in)

you will also want to add an apply method to your MyLine2d class
public void apply (MyXform in)

As always:

Write a test applet to thouroughly test your new classes. 

Hand in the same as for your previous assignments.