Program 2, Due October 15 before class begins

Objectives: Learn basic 2D interactive graphics programming including rubber-banding, picking, and beginning transformations.

To Do: Write a children's "paint" program that lets the users draw colored circles, rectangles, and polygons (connected line segments/polylines). Use fltk for your GUI. Design a nice interface to allow users to select color for their objects, and also whether they want a line (border only) drawing or filled object. You should start with a basic fltk demo program found on the class web page.

Stage 1:

• Rectangles and circles should be drawn using the left mouse button.
• Rectangles are drawn by clicking down on a corner, dragging the mouse, and releasing at the opposite diagonal corner.
• Circle centers are specified by the position of the mouse down event and the radius is specified by the distance of the mouse up event.
• Polylines are drawn by clicking on joints using the left button and ended by clicking with the right button.

Stage 2:

• All objects should be created by rubber-banding.
• All objects that have been created should be maintained by the program.
• They are drawn from oldest to most recent, so that the most recent object can overlap (partially or completely) older objects.

Stage 3:

• Allow objects on the screen to be selected with the middle mouse button.
• Allow users to choose an object.
• If an object is chosen it becomes the most recently created object (raise it to the top of the list of objects)
• Allow the user to delete the selected object if desired.

Grading: We must be able to compile/test your code. We’ll need your code, makefile, and README for this assignment.

80 pts: functionality (20-creating circles and rectangles, 20-creating polylines, 20-picking, 10-deletion, 10-usability of GUI).

20 pts: style (documentation/README/commenting/readability.

Extra credit can be gained for allowing the user to translate and scale the drawn objects.

Extra credit can also be gained for generating spheres and cubes instead of rectangles and circles.

Submission: The class locker exists. The name is cmps160-dw.f04.

To submit a program %submit cmps160-dw.f04 program2 filename filename …

For Example:

% submit cmps160-dw.f04 program2 main.cxx Makefile gui.cxx gui.h gl_window.cxx gl_window.h README

To check what you have submitted %peek cmps160-dw.f04 program2