tsenya

tsenya(a, b, c, d, e, f)

sutisa, dikolosa and godisa all do one job underneath: they multiply every point on the canvas by a table of numbers. That table is called a matrix in English — no Setswana word is used in its place, so Bopa names this function after what it does: it puts the numbers in.

The six numbers are a, b, c, d, e, f, and they do this:

• a and d scale sideways and vertically — tsenya(2, 0, 0, 2, 0, 0) is the same as godisa(2).
• e and f move — tsenya(1, 0, 0, 1, 50, 20) is the same as sutisa(50, 20).
• b and c slant.

You will rarely need this: sutisa, dikolosa and godisa are easier to read and do the same things. It is here so you can apply several transformations at once.

Like every other transformation it accumulates, and is reset at the start of tshwantsha. Use simololaGape to wipe them all.

Parameters

Name	Type	Description
a	palo	Scale sideways.
b	palo	Slant vertically.
c	palo	Slant sideways.
d	palo	Scale vertically.
e	palo	Move sideways.
f	palo	Move vertically.

Examples

Six numbers doing what `sutisa` and `godisa` do

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tiro setaLoeto() {
  thalaKanefase(400, 400);
  bokamorago(238);
  tlogelaMothalo();

  // ka sutisa le godisa
  baya();
  sutisa(110, 200);
  godisa(1.5);
  tlatsaMmala(220, 120, 110);
  thalaSekwere(-40, -40, 80);
  tsaya();

  // ka dipalo tse thataro — popego e e tshwanang tota
  baya();
  tsenya(1.5, 0, 0, 1.5, 290, 200);
  tlatsaMmala(110, 170, 220);
  thalaSekwere(-40, -40, 80);
  tsaya();
}

See also

simololaGape, sutisa, godisa, sekamisaX, baya