Due date: Wednesday, February 3.

Ex. 1 Download the following files discussed in class. Compile and run each of the 2 applications to make sure they work:

A Makefile for both programs.

Animation with a small menu program (default for make):

• animation_menu.cc
• menu_handle.cc
• menu_handle.h

• hello_world_gnome.cc

Note. If you completed the lab 1 you don't need to compile and run the hello world application again.

Ex. 2. a. Modify the functionality of the 5 bouncing balls such that they bounce off all the walls. Currently they only bounce off the ground. This should keep them all inside the area at all time. For this you need to modify the function nextBall. To make a ball bounce off any wall, you only need to change the sign of one of the components of the speed.

With this modification, the speed of the balls should be decreasing little by little and after a while they should be lying on the ground. Write a function that resets them back in motion starting from an arbitrary position and speed, as in the beginning. Here is the prototype for this function:

void reset(GtkWidget *button, gpointer data);

This function will be the callback for a menu button.

b. Modify the menus the following way:

• Add an item to the file menu and call it Reset. Set the callback function for this item to be the one defined in the previous exercise. Add a separator between this item and the exit item.
• Replace the menu Some Menu with a menu called Animation.
  • The first item should be called "Increase speed" and it should add 0.1 to the speed of each ball (both x and y). If the speed is negative, then it should remove 0.1 from it.
  • The second item should be called "Decrease speed" and it should subtract 0.1 from the absolute value of the speed of each ball while preserving the sign (just as for the previous one).
  • Add a separator after these two items.
  • Add a third item called "Freeze" that sets all the velocities to 0.
• Add a third menu at the top called "Help". Add at least one menu item in here that prints out any message you might consider helpful to someone playing with the program.

Send me: the source file(s) that you modified, individual attachments by email.