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1. To get full credit here you must use either a vector or a list in C or a Vector or an ArrayList in Java Resizing a regular array will only give you 3 points of extra credit Using a ridiculously large array will not give you any extra point and quite frankly should even cost you some Note In the next assignment you will have to handle lists of objects so looking into the STL vector and list classes in C or Vector and ArrayList in Java is definitely time well spent even if you can t complete this extra credit section 3 2 Print vertex coordinates of a new shape up to 10 pts When the user hits the space bar to create a new shape print to the console the coordinates of the four vertices of the new shape in the original reference frame You get 5 points for each of the two versions of application matrix based vs operation based for which you add this feature 3 3 Implement skewing up to 15 pts For this we need to define new key behaviors 3 3 1 Mode selection e k or K selects the frame skewing mode 3 3 2 Role of the arrow keys e In frame skewing mode the left and right arrow keys control the amount of x added to the y axis by increments of 0 1 e In frame skewing mode the up and down arrow keys control the amount of y added to the x axis by increments of 0 1 CSC 406 Computer Graphics Programming Assignment 01 2011 09 26 6 3 3 3 Extra points breakup You get 102. pts of extra credit for adding skewing to the matrix based version of your application You would get an extra 5 pts of extra credit for adding it to the operation based version but quite frankly I can t think of any non ugly way of doing that 3 4 Translation relative to the old original frame 10 pts You should only add this feature to the matrix based version of the application For this new feature we need to define new key behaviors 3 4 1 Mode selection e o or O selects the mode for translating the current frame along the axes of the old original reference frame 3 4 2 Role of the arrow keys e the left and right arrow keys control frame translation along the original x axis e the up and down arrow keys control frame translation along the original y axis 4 What to hand in 4 1 Documentation 4 1 1 Inline comments You should properly comment and document your code This means that after cleaning up your code including the one you use from the handout you should provide inline comments to explain what is going on there I remind you that code level comments are not suppose to paraphrase in plain English the code that just follows it So the following comment is useless ridiculous increment x by one okay The purpose of code level comments is to explain what a small block of code does for example by giving the outline of the algorithm or by re stating the code s objective
3. CSC 406 Computer Graphics Programming Assignment 01 2011 09 26 1 CSC 406 Computer Graphics Programming Assignment 01 Fall 2011 Monday September 26 2011 fixed Tuesday Sept 27 Due date Monday October 04 1 What this Assignment is About 1 1 Objectives In this assignment we have three objectives e To write a first small OpenGL or jogl program e To get used to the translation rotation and scaling transformations of OpenGL e To use OpenGL to perform matrix computations or perform matrix computations and apply them in OpenGL This is an individual assignment You are of course encouraged to discuss it with other students but I expect you complete it by yourself 1 2 Handouts The handouts for this assignment consist of e this document as a pdf file e asmall code fragment for displaying the local reference frame 1 3 GUI setup For this program you simply need to create a square viewport in OpenGL create a square window in jogl it s the panel in which you render that should be square No need for any menu elements our mouse event handling Our entire interface will be keyboard based 1 3 1 Special keys in glut In glut special keys such as arrow keys are not handled by the glut KeyboardFunc callback but by the glut SpecialFunc callback Otherwise the handling of special key events is quite similar to that of regular key events CSC 406 Computer Graphics Programming As
4. h provided in the handout does not work for you get in touch with the TA and me ASAP 4 4 Report For this assignment the report consists of a simple user manual giving the list of commands avail able to the user Definitly mention if you made changes to the specifications for the assignment and explain why and which extra credit features if any you implemented Also discuss possible difficulties encountered while completing the assignment 5 Grading If you submit code that could not possibly compile contains obvious syntax errors your assign ment will not be graded and you will get a grade of 0 For all others e the code does what it is supposed to do 45 e comments 15 readability of the code 20 e proper identifier names 10 report 10
5. pplication behavior Your application must at any time display the current reference frame resulting from a series of transformations applied by the user The user will be able through simple key strokes e to change the current reference frame translation rotation scaling skewing e to draw a simple shape at the location of the current reference frame e to return to a previously stored reference frame 2 2 Basic keystrokes 2 2 1 Mode selection e r or R selects the frame rotation mode e t or T selects the frame translation mode e s or S selects the frame scaling mode CSC 406 Computer Graphics Programming Assignment 01 2011 09 26 4 2 2 2 2 2 3 Role of the arrow keys In frame rotation mode the left and right arrow keys rotate the frame counterclockwise and clockwise respectively by increments of 15 degree In frame translation mode the left and right arrow keys control frame translation along the local x axis while the up and down arrow keys controls frame translation along the local y axis by steps of 0 25 in the current frame In frame scaling mode the left and right arrow keys control frame scaling along the local x axis while the up and down arrow keys controls frame scaling along the local y axis Frame scaling consists in scaling up down along the chosen direction by a factor of 1 2 Action keys q or Q ends execution the space key is used to add to the
6. s The level of details of comments should be adapted to the level of your intended reader Here at the 406 level I don t need you to give me line by line comments for some elementary blocks of code For example find largest element in array a or when multiplying two matrices C A B is good enough for me prefer inline comments as opposed to block comments because you can t nest block comments CSC 406 Computer Graphics Programming Assignment 01 2011 09 26 7 4 2 Javadoc style comments for functions Next week we will start writing graphic classes and C programmers will have to provide header files for these classes and javadoc style comments for these classes Just to get prepared for that I want you to start writing Javadoc style comments for all the functions in your code I only really care about the function summary detailed explanation and param return and possibly see fields Java programmers can naturally run javadoc on their code to produce the documentation C programmers can use Doxygen a free download on their source file starting with next assignment we will only use header files to produce the documentation 4 3 Source code Provide all the source files and header files needed to compile and run your program Remember that your code should be able to compile and execute as is with Eclipse so don t include any platform specific headers in your code If the file g1Plat form
7. scene a small square of side 1 drawn in the local reference frame 2 2 4 Frame storage Your application will provide storage for 4 reference frames Ra Ry Re Ra These frames are all initialized to coincide with the camera world reference frame A saves the current reference frame as Ra B saves the current reference frame as Ry C saves the current reference frame as Re D saves the current reference frame as Ry and then 2 3 a sets the current reference frame to coincide with Ra b sets the current reference frame to coincide with Ry c sets the current reference frame to coincide with Re d sets the current reference frame to coincide with Ra Number of objects to draw Your application should allow the user to draw 10 objects corresponding to 10 different reference frames After 10 objects have been created a newly created object will simply replace the oldest object on the list CSC 406 Computer Graphics Programming Assignment 01 2011 09 26 5 2 4 Two versions of the code You must provide two versions of the application One in which all geometric transformations are performed using the OpenGL glTranslate glRotate and glScale functions and the other versions in which you perform these operations exclusively by using the g1SetMatrix and g1MultMatrix functions 3 Various Extra Credit for a maximum of 130 pts 3 1 Allow an unlimited number of objects 10 pts
8. signment 01 2011 09 26 2 void mySpecialKeyFunc int key int x int y switch key case of left arrow case GLUT_KEY_LEFT your code goes her break case of right arrow case GLUT_KEY_RIGHT your code goes her break case of up arrow case GLUT_KEY_UP your code goes her break case of down arrow case GLUT_KEY_DOWN your code goes her break probably needed here force display glutPostRedisplay Of course you need to set up the call back when you create your window glutSpecialFunc mySpecialKeyFunc 1 3 2 Special keys in jogl In jogl all the event handling is done by the JVM so you handle arrow and other special keys the way you would handle any other key strokes in any other Java application public void keyPressed KeyEvent e Switch e getKeyCode case of left arrow case KeyEvent VK_LEFT your code goes her break case of right arrow case KeyEvent VK_RIGHT your code goes her CSC 406 Computer Graphics Programming Assignment 01 2011 09 26 3 break case of up arrow case KeyEvent VK_UP your code goes her break case of down arrow case KeyEvent VK_DOWN your code goes her break probably needed here repaint 1 4 World dimensions The world you will be drawing into is square and covers the range 10 10 for both x and y 2 What to Do 2 1 A
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