Description
Requirements:
• Write a WebGL program that creates and visualizes random polygons (n-gons). Name your source code
hw2.html and hw2.js. The program should meet the following requirements:
– Set the title of the program to “hw2” (must appear as such on title bar).
– The program generates 20 random polygons at random positions with random colors (see Fig. 1).
– Each polygon must have a random number of vertices (between 3 and 9).
– Each polygon must continuously rotate and scale (see accompanying video on Canvas). Note that the
rotation must be done in-place about its own center, not about the origin. Hint: first translate the polygon
to the origin, then rotate, then translate it back to its original position.
– The scaling must go back and forth between scaling factors of 1 and 0 as upperbound and lowerbound,
respectively.
– Each time you hit F5 (refresh), the canvas must display a new set of 20 random polygons rotating and
scaling in-place (See Fig. 1 – 2).
Figure 1: Rotating and scaling polygons 1
1
Figure 2: Rotating and scaling polygons 2
What to submit:
• Submit all your source files (.html, .js) that are needed for compilation, including library files/folders. Missing library files/folders will lead to point deduction.
How to submit:
• Use Canvas Assignment Submission system to submit your source files.
• Make sure to zip all your files/folders into hw2.zip, then submit your hw2.zip as a single file.
Policy
• Do all the assignments on Chrome Development Tools using HTML, JavaScript, and GLSL ES.
• At the top of each source file, provide comments specifying the author, date, and a brief description of the file.
• Source code must contain enough comments here and there to make it easy enough to follow. Insufficient
comments could lead to point deduction.
• Incomplete program will get almost no credit (e.g., program does not run due to compile errors or program
terminates prematurely due to run-time errors).
• Thou shall not covet thy neighbor’s code. If identical (or nearly identical) submissions are found among
students, every student involved will get automatic zero for the assignment. The same goes for copying
existing code from online source.
• If a student makes multiple submissions, only the last submission will be considered valid.
2 CS 4410
