In this lab, we will implement a version of the bouncing character animation using a Scene struct type to represent the position and direction of the character. However, the accessor functions to initialize, render, and update the struct will use pointers to take an instance of struct Scene.
Getting Started
As always, you may refer to Lab 1 if you need a reminder about how to start the Cygwin Bash Shell or Notepad++.
Begin by downloading CS101_Lab20.zip. Save the zip file in the H:\CS101 directory.
Start the Cygwin Bash Shell and run the following commands:
cd h:
cd CS101
unzip CS101_Lab20.zip
cd CS101_Lab20
Start the Notepad++ text editor. Use it to open the files
H:\CS101\CS101_Lab20\Boing3.cpp
When you are ready to compile the program, in the Cygwin window type the command
make
To run the program, in the Cygwin window type the command
./Boing3.exe
Your Task
The task is similar to Lab 18 and Lab 19: implement a bouncing character animation.
The main difference is that the scene_init, scene_render, and scene_update functions will now have the following prototypes:
void scene_init(struct Scene *s);
void scene_render(const struct Scene *s);
void scene_update(struct Scene *s);As you can see, the functions now take a pointer to the struct Scene.
You will need to do three things to complete the program:
- Add fields to the struct Scene data type
- Modify the main function to add calls to these functions, as indicated by the TODO comments
- Implement these functions to match the prototypes
Hints
Since these functions take a pointer to a struct Scene, you will need to take the address of the myScene variable in main in order to pass it to these functions.
Use the arrow (->) operator to access the fields of the struct Scene within the functions.
Submitting
When you are done, run the following command from the Cygwin bash shell:
make submit
You will be prompted for your Marmoset username and password, which you should have received by email. Note that your password will not appear on the screen.
Important:
You must submit your work before leaving class. If you do not submit work, you will not receive any credit for the lab.
