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Stellarium script: wait for pressing a key

This Stellarium script is a hack that tries to demonstrate how a Stellarium-Presentation can be stopped until the user presses one of the following keys: =, -, ] or [.

These keys change the Stellarium-time. If the function waitForKey() detects such a change in time, it realizes that one of these keys was pressed and returns to the caller.

// vim: ft=javascript
// Name: waitForKey hack
// Author: Matthew Gates
// License: Public Domain
// Description: defined waitForKey() which waits for day or week time shift key to be pressed.
//
// ..\runScript.bat waitForKey.ssc

var idLabel = LabelMgr.labelScreen("Waiting for pressing =, -, ] or [", 30, 200, true, 20, "#ff8833");
waitForKey();
LabelMgr.deleteLabel(idLabel);

idLabel = LabelMgr.labelScreen("Key was pressed.", 30, 200, true, 20, "#ff8833");

core.wait(1.5);
LabelMgr.deleteLabel(idLabel);
// LabelMgr.deleteAllLabels();

function waitForKey() {
   var savedDay  = core.getJDay();
   var savedRate = core.getTimeRate();

//
// freeze time.
//
   core.setTimeRate(0);

//
// Store the Julian day number when scene was frozen
//
   var frozenDay    = Math.floor(core.getJDay());

//
// Copy value
//
   var displayedDay = frozenDay;

//
// 
   while (frozenDay == Math.floor(core.getJDay())) {
     //
     // It's a busy wait loop, but heh, this is a hack...
        core.wait(0.25);
   }

// Restore the old time and time rate and return
   core.setJDay(savedDay);
   core.setTimeRate(savedRate);
}

Github repository about-Stellarium, path: /Scripts/waitForKey.ssc

Stellarium script: wait for pressing a key

See also