leotwanaLeDikologile

tiro leotwanaLeDikologile(tiragalo) { ... }

Declare leotwanaLeDikologile as a function with tiro. Bopa hands it an event — an object that tells you how far the wheel turned:

tiro leotwanaLeDikologile(tiragalo) { kwala(tiragalo.delta); }

tiragalo.delta is a number. Measured: delta is the browser event’s own deltaY, so it is positive when you scroll down and negative when you scroll up. What is written here was measured in the running Bopa editor, which reported delta = 300 on a scroll down.

On Apple machines with natural scrolling the signs are reversed.

Stopping the page from scrolling. Adding busa maaka; at the end of the function stops the page underneath from scrolling — which is what you want when the wheel is zooming a picture. In the Bopa editor the preview pane has nothing to scroll, so it makes no difference there; on the reference site it does.

A phone has no wheel. This is a mouse-only event.

Parameters

Name	Type	Description
tiragalo (optional)	sengwe	The browser event. tiragalo.delta tells you how far the wheel turned. Optional.

Examples

Zooming a circle with the wheel

Rerun ↻Open in editor ↗

diri bogolo = 120;

tiro setaLoeto() {
  thalaKanefase(400, 260);
  tlhalosa('Sediko se se mo bogareng se bogolo jwa sona bo fetolwang ka leotwana la peba.');
}

tiro tshwantsha() {
  bokamorago(234);
  tlogelaMothalo();
  tlatsaMmala(210, 120, 90);
  thalaSediko(200, 130, bogolo);

  tlatsaMmala(50);
  bogoloJwaMokwalo(15);
  rulaganyaMokwalo(BOGARE);
  thalaMokwalo(atametsa(bogolo), 200, 245);
}

tiro leotwanaLeDikologile(tiragalo) {
  bogolo = thibela(bogolo - tiragalo.delta * 0.2, 20, 240);
  busa maaka;
}

See also

pebaESutile, pebaETobeditswe