CS 470 Homework 2 : Due Sept. 5, 2008
1 2D Interactive Graphics
The goal of this homework is to learn to write GLUT callback functions for ren-
dering and user input, and to become familiar with OpenGL through basic 2D
rendering. You may use the files from homework 1 as a starting point. Refer to
http://www.opengl.org/documentation/specs/glut/spec3/spec3.html for
a full description of glut functions.
1.1 Specification
Your will create an interactive 2D application with the following features:
•10% - Window management : Open a 480 ×480 window. The text in the
titlebar should read ’Homework 2’ followed by your last and first name.
•10% - OpenGL drawing : The background color (use glClearColor)
should be white. Draw a grid of gray horizontal and vertical lines spaced
0.1 units apart. The grid lines through the origin should be 2 pixels wide,
all others should be 1 pixel wide. This grid background should appear
behind all other graphics. Use rendering order to achieve this (render
from back to front, do not use the depth buffer).
•10% - OpenGL drawing : Render the ’player’ as a square polygon 0.5 units
wide using points and lines. Render the vertex points in blue, four pixels
wide. Render the edges of the polygon in green, with 2 pixel wide lines.
The player will move in response to keyboard input.
Also render a target as a red cross with a vertical and horizonal line, each
0.1 unit long. Initially the cross is at the origin (center of the screen). The
target will move in response to mouse input.
Render a projectile as a white point 5 pixels wide. Initially the player,
target, and projectile are all centered at the origin.
•20% - GLUT text : Using the appropriate OpenGL functions and glut
bitmap text routines, write a function DrawText(float x, float y, float
z, void* font, char* text). Print the projectile coordinates in the
lower left corner. The text should appear on top of all other graph-
ics. Hint : glRasterPos2f and glutBitmapCharacter. Use the 24-point
proportional spaced Times Roman font.
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