Class 40: Drawing with Script-Fu

Held: Friday, April 13, 2007

Summary: Today we consider some techniques for making simple drawings.

Related Pages:

• EBoard.
• Lab: Drawing with Script-Fu.
• Reading: Drawing with Script-Fu.

Due

• HW 12

Notes:

• We'll go over your answers to homework 11.
• We may have prospectives today (unless I'm a week off, in which case we'll ahve prospectives next Friday).
• Monday's reading will probably be ready late Saturday night. Sorry.

Overview:

• Representing drawings.
• Transforming drawings.
• Lab.

Drawings

• We represent drawings as sequences (lists) of points.
• We build points with (point x y).
• We draw sequences of points with (connect-the-dots image points)
• One sample drawing: tree
• Two sequence generators:
  • spiral
  • zig-zag

Transforming Drawings

Note: The transformations are slightly different than those in the reading.

• Translate horizontally: (htrans-points amt points)
• Translate vertically: (vtrans-points amt points)
• Scale: (scale-points amt points)
• Scale horizontally: (hscale-points amt points)
• Scale vertically: (vscale-points amt points)
• Vary: (vary amt points)

• Do the lab.