Using the Mouse Button for Plotting Points

• Registering the callback for the mouse
• Determing the state of the button
• Converting the y value
• Choosing the frame to coincide with the window

Using pixel coordinates rather than real world coordinates

• Using glOrtho to specify the screen window
• Introduction to scan-line algorithms

Raster Displays

• Raster Image
• Pixel Map (Bitmap)
• Frame buffer
• Line Drawing Algorithms on a Raster Display
  • DDA Algorithm
  • Bresenham's Line Drawing Algorithm

World Windows (Frame) and Screen Windows

• When the frame and the screen window should be the same:
  • using pixels to correspond to points

World Windows (Frame) and Viewports

• Mapping from (World) Frame to Entire (Screen) Window
  • The math behind the Frame to Window transformation
• Mapping from (World) Frame to a Viewport (Part of a Window)
• World Windows (Frame) and Screen Windows
  • Aspect Ratio of the Frame
  • Aspect Ratio of the Screen Window
  • Preserving Aspect Ratio
    • via choosing the dimensions of the screen window
    • via choosing the larger dimension of the screen window and forcing the choice of the other dimension
    • via automatically using a viewport that preserves aspect ratio
• Using the reshaping function

Making the primitive drawing commands more user-friendly

Making the window and viewport commands more user-friendly

• the window class
• the frame class
• the setVP function
• the autoViewPort function

The TUGL collection - putting it all together

Using Multiple Windows

Managing Projects in Graphics with makefile

REFERENCE(S):

Computer Graphics Using OpenGL, 3rd Edition (Hill):
      Chapter 9 (9.4 - Bresenham's Algorithm)
      Chapter 3 (3.1, 3.2 - Window to Viewport Mapping)
   
     
OpenGL Manual/v.1.2: Chapter 2 (p. 27 - 64); Chapter 3 (p.126)
GLUT Programming Interface: Chapters 1 - 4

/classes/cs3014/files/week2/multiplewin.cpp
/classes/cs3014/files/week2/horiz_stripes.cpp
/classes/cs3014/files/week2/horiz_stripes2.cpp
/classes/cs3014/files/week2/point_class1.cpp
/classes/cs3014/files/week2/point_class2.cpp

Optional:

/classes/cs3014/files/week2/glui_demo1.cpp
/classes/cs3014/files/week2/glui_demo1b.cpp
/classes/cs3014/files/week2/glui_demo1c.cpp
/classes/cs3014/files/week2/glui_demo1d.cpp