|
Announcements
& syllabus
Schedule
Programming
assignments
Homework
Exams
Courseware
|
Programming
Assignment 1: Simple 2D Animation
Summary
You will write an openGL / GLUT
program that will allow the user to interactively specify and play back a
simple key framed animation in 2D. In a key framed animation, the user
specifies several "snapshots" (or key frames), and the system smoothly
interpolates between them. This program will allow you to demonstrate you
skill in using 2D drawing, transformation, and user interface features of
openGL and GLUT.
Due
Date
The assignment is due on Wednesday
Feb. 20 at 11:59 PM. The standard late policy for
programs is in effect.
Required
Features
- The program should open a
single window of at least 500x500 pixels with a plain white background
to start.
- At the bottom of the window,
create a subwindow of at least 50 pixels in height, where you will
display text information. This text should initially be:
- Mode display: "Editing
objects"
- Total time display:
"Total animation time: 5 seconds"
- Elapsed time display:
"Elapsed time: 0 seconds"
- In the main (upper)
subwindow:
- The user may left click on
an object to select it.
- When an object is selected,
draw a gray border around it.
- When an object is selected,
the user may drag it to a new location while holding down the left
mouse button.
- In a pop-up menu activated
with the right mouse button, provide the following menu items:
- New object (creates a 20x20
pixel black square centered at the position of the click – this option is only available when
in editing objects mode)
- Delete (deletes selected
object - this option is only available
when in objects mode)
- Change edit mode (cycles
between modes: "Editing objects," "Editing key frame
#1," ... "Editing key frame #5")
- Play animation (plays the
animation using the initial state specified in the editing objects mode
and the 5 key frames specified by the user, over the total time
specified by the user)
- Total time (submenu with the
following items)
- Increase (increases the
total time by 1 second)
- Decrease (decreases the
total time by 1 second)
- Transform (submenu with the
following items)
- Rotate + (rotate the
selected object by +5 degrees)
- Rotate – (rotate the
selected object by -5 degrees)
- XScale + (scale the
selected object by +10% in the x direction)
- XScale – (scale the
selected object by -10% in the x direction)
- YScale + (scale the
selected object by +10% in the y direction)
- YScale – (scale the
selected object by -10% in the y direction)
- Color (submenu with the
following items - these options
are only available when in editing objects mode)
- Red (change color of
selected object to red)
- Blue (change color of
selected object to blue)
- Green (change color of
selected object to green)
- Black (change color of
selected object to black)
- When animation playback is
done, return to editing objects mode.
- Update the total time display
when the user chooses the increase or decrease menu items.
- Update the elapsed time
display when the user switches to a different key frame (display the
starting time of that key frame; e.g., if the total time is 10 seconds
and the user switches to key frame #3, the elapsed time would be 6
seconds), or when the user plays the animation (update the elapsed time
continuously until playback is done.
- Think of the editing objects
mode as key frame #0. That is, in this mode you set the initial
positions/orientations/scales/colors of each object. The elapsed time is
0 seconds in editing objects mode. Think of key frame #5 as the final
state of the animation.
- When the user switches to a
new key frame for the first time,
set the position/orientation/scale of each object to its position/orientation/scale
in the previous key frame.
- During animation playback,
interpolate object positions, orientations, and sizes smoothly from one
key frame to the next. You may use a fixed frame rate; i.e., update the
display every tenth of a second, so that there are 10 frames in each
second of animation.
Optional
Features (for bonus points)
- Allow direct manipulation of
object rotation and scale via handles on the selected object.
- Allow an unlimited number of
key frames, instead of only five.
- Allow users to create/delete
objects in any key frame, and make these objects appear/disappear as
appropriate during the animation.
- Allow users to change object
color in any key frame, and interpolate the color of the objects appropriately
during the animation.
Submission
Turn in your program via email to the TA. You may either submit a
single source file or a ZIP archive of several source/header files. You may
also optionally include a plain text README file if you wish.
|