sekgala

sekgala(x1, y1, x2, y2)

sekgala(x1, y1, x2, y2) returns the length of the straight line between the first point and the second.

The order does not matter — sekgala(0, 0, 3, 4) and sekgala(3, 4, 0, 0) both return 5.

It is most often used to ask how near one thing is to another: changing a colour as the mouse approaches, choosing the points that fall inside a circle, or building shapes that lean on a centre.

It also accepts points in three dimensions — sekgala(x1, y1, z1, x2, y2, z2) — though Bopa does not yet carry three-dimensional shapes.

Parameters

Name	Type	Description
x1	palo	The x of the first point.
y1	palo	The y of the first point.
x2	palo	The x of the second point.
y2	palo	The y of the second point.

Examples

Colour that depends on the distance from the centre

Rerun ↻Open in editor ↗

tiro setaLoeto() {
  thalaKanefase(400, 400);
  bokamorago(18, 20, 30);
  tlogelaMothalo();

  gopheta (diri x = 20; x < 400; x = x + 20) {
    gopheta (diri y = 20; y < 400; y = y + 20) {
      metlha kgakala = sekgala(x, y, 200, 200);

      // 0..260 go ya go 255..40
      diri mmala = lekanyetsa(kgakala, 0, 260, 255, 40);
      diri bogolwane = lekanyetsa(kgakala, 0, 260, 18, 4);

      tlatsaMmala(mmala, 120, 200);
      thalaSediko(x, y, bogolwane);
    }
  }
}

Only the points that fall inside a circle

Rerun ↻Open in editor ↗

tiro setaLoeto() {
  thalaKanefase(400, 400);
  bokamorago(240);
  tlogelaMothalo();

  paloEpePeo(33);

  gopheta (diri i = 0; i < 400; i = i + 1) {
    diri x = paloEpe(bophara);
    diri y = paloEpe(boleele);

    fa (sekgala(x, y, 200, 200) < 150) {
      tlatsaMmala(220, 90, 70);
    } gongwe {
      tlatsaMmala(200);
    }

    thalaSediko(x, y, 8);
  }
}

See also

bokgakala, lekanyetsa, magareng