OpenGL

OpenGL programs done in lab

1. Draw red color ellipse

2. Move circle around a line

Circle moves clockwise around a line using right arrow. Logic is simple, at the endpoints of line the velocity direction gets reversed, the y-axis position is also changed by 2 * Radius.

3. Move circle with arrow keys

4. Zoom in/ out of a circle

I used glScalef function to scale the image

5. Dashed line in 3 different colors

We have to enable stippled lines

6. Draw free hand line using mouse

I simply store all the points while the LMB is pressed and clear the screen when RMB is pressed. I use small connected line segments (GL_LINE_STRIP) to draw the curves

6. Zoom in/ out and rotate a cube