Functional Problem Solving (CSC 151 2016S) : Reference

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Reference: [Setup] [Remote] [VM] [Errors] - [Functions A-Z] [Functions By Topic] - [Racket] [Scheme Report (R5RS)] [R6RS] [TSPL4]

Related Courses: [Curtsinger (2016S)] [Davis (2013F)] [Rebelsky (2015F)] [Weinman (2014F)]

Misc: [SamR] [Glimmer Labs] [CS@Grinnell] [Grinnell] - [Issue Tracker (Course)]

Positions

Building Positions

(position-new col row)
MediaScheme Position Procedure. Build a new position that represents the point at (col,row).

Accessing Components

(position-col pos)
MediaScheme Position Procedure. Extract the column from position pos.
(position-row pos)
MediaScheme Position Procedure. Extract the row from position pos.

Miscellaneous

(position? value)
MediaScheme Position Procedure. Determine if value is a position (or can be interpreted as such).
(position-offset position hoff voff)
MediaScheme Position Procedure. Create a new position, offset from position horizontally by hoff and vertically by voff.
(position-distance pos1 pos2)
MediaScheme Position Procedure. Compute the distance between pos1 and pos2.
(position-interpolate pos1 pos2 percent)
MediaScheme Position Procedure. Create a new position which is percent (expressed as a real number between 0 and 1) of the way from pos1 to pos2
(random-positions n cols rows)
MediaScheme Position Procedure. Create n positions, each of which is difficult to predict and each with a non-negative column less than cols and a non-negative row less than rows.