| 2017-02-17 18:52:47 | 946219 | 20996 | INFO: | LBS reactivated |
| 2017-02-17 18:52:47 | 949193 | 20996 | INFO: | LBS disabled through external height change |
| 2017-02-17 18:55:23 | 603683 | 20996 | INFO: | LBS reactivated |
/**
* Calculate the shutter angle which is neccessary to prevent sun rays from
* falling into the room based on current elevation together with width and
* distance of shutter slats and angle offset.
*
* @param $E - The array with all the input values
* @return float - Shutter angle in degrees
*/
function LB_LBSID_calculateShutterAngle($E)
{
$elevation = $E[4]['value'];
$azimut = $E[5]['value'];
$faccadeAngle = $E[6]['value'];
$widthA = $E[9]['value'];
$heightB = $E[10]['value'];
$shutterAngleOffset = $E[11]['value'];
$shutterType = $E[12]['value'];
$minimalShutterAnglePercent = $E[35]['value'];
$shutterStepping = $E[38]['value'];
// correction for non-direct sun on the facade,
// the apparent width of the shutter is larger
$oldwidthA = $widthA;
$widthA = $widthA / cos(deg2rad( $azimut - $faccadeAngle )) ;
$angledifference = $azimut - $faccadeAngle;
$cosfactor = cos(deg2rad( $azimut - $faccadeAngle ));
LB_LBSID_debug(true, "Elevation correction: angle difference ${angledifference}°, old width ${oldwidthA} mm, cosinus factor ${cosfactor}, new width ${widthA} mm");
// The following is based on an oblique triangle
// $alpha is the opposit angle of shutter slat width,
// so this is the difference between $elevation and vertical
$alpha = 90 - $elevation;
// $beta is the opposit angle of shutter slat distance
$beta = asin(sin($alpha / 180 * pi()) * $heightB / $widthA) * 180 / pi();
// $gamma is the angle between vertical and shutter slat
$gamma = 180 - $alpha - $beta;
// $shutterAngle is the difference between horizontal and shutter slat,
// so this is the result of the calculation
$shutterAngle = round(90 - $gamma);
LB_LBSID_debug(true, "Elevation: ${elevation}°, resulting shutter angle: ${shutterAngle}° (without stepping and offset)");
// Add given shutter angle offset and define minimal shutter angle
if ($shutterType == 0) {
// 90° shutters
$modifier = round($shutterStepping * 0.9);
$shutterAngle = LB_LBSID_handleElevation($shutterAngle, $modifier, $elevation);
// "-" = 0° = 0%, "\" = 90° = 100%
$shutterAngle = $shutterAngle + ($shutterAngleOffset * 0.9);
$minimalShutterAngle = $minimalShutterAnglePercent * 0.9;
} else {
// 180° shutters
$modifier = round($shutterStepping * 1.8);
$shutterAngle = LB_LBSID_handleElevation($shutterAngle, $modifier, $elevation);
// "/" = -90° = 0%, "-" = 0° = 50%, "\" = 90° = 100%
$shutterAngle = $shutterAngle + ($shutterAngleOffset * 1.8);
$minimalShutterAngle = $minimalShutterAnglePercent * 1.8 - 90;
}
$shutterAngle = round($shutterAngle);
// Check calculated angle against given minimal angle
if ($shutterAngle < $minimalShutterAngle) {
$shutterAngle = $minimalShutterAngle;
}
LB_LBSID_debug(true, "Elevation: ${elevation}°, resulting shutter angle: ${shutterAngle}°");
return $shutterAngle;
}
Elevation correction: angle difference -75.01869774572°, old width 80 mm, cosinus factor 0.25850381377232, new width 309.47319048245 mm Elevation correction: angle difference -33.61171570516°, old width 80 mm, cosinus factor 0.83280806710618, new width 96.060548834477 mm Elevation correction: angle difference -20.85761468782°, old width 80 mm, cosinus factor 0.93446812033792, new width 85.610197136602 m Elevation correction: angle difference -15.18547243168°, old width 80 mm, cosinus factor 0.96508294254, new width 82.894429560063 mm
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