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Control light intensity with a UI slider


Control light intensity with a UI slider

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Control light intensity with a UI slider
Tag : chash , By : new Blackberry devel
Date : November 24 2020, 05:47 AM

it should still fix some issue Subscribe to the slider's onValueChanged event to be notified when the slider value changes. When that happens, assign the slider's value to the light's intensity value: Light.intensity = Slider.value.
That's it.
//Add your slider from the Editor
public Slider sliderRef;
//Add your light from the Editor
public Light lightRef;

void OnEnable()
{
    //Subscribe to the Slider Click event
    sliderRef.onValueChanged.AddListener(sliderCallBack);
}

//Will be called when Slider changes
void sliderCallBack(float value)
{
    Debug.Log("Slider Value Changed: " + value);
    lightRef.intensity = sliderRef.value;
}

void OnDisable()
{
    //Un-Subscribe To Slider Event
    sliderRef.onValueChanged.RemoveAllListeners();
}

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WPF 3D light intensity


Tag : wpf , By : Raghaw
Date : March 29 2020, 07:55 AM
wish helps you The way to change the intensity of an AmbientLight in WPF is to change the color. If you want the light to be less intense you just set it to be a darker color (i.e. Gray instead of White or Navy instead of Blue).

Correct image for local dark / light spots, equalise luminance / intensity (local in location, not by dark/medium/light


Tag : image-processing , By : Nosayaba
Date : March 29 2020, 07:55 AM
I wish this help you You will have to very precisely model the nature of the dark spots for this process to work. Can you characterize whether the dark gradient is linear, exponential, power, trigonometric, or some other predictable function? Is it always exactly circular?
Having straight-line elements in the photo helps, and may provide a source of samples to calculate the nature of the dark spot from. If you treat the dark spot like a quadratic or cubic function in three dimensions (X, Y, luminance) then you can solve it based on a certain number of known points.

Control the intensity of the flash light in xamain.forms


Tag : chash , By : Angelo Giannatos
Date : March 29 2020, 07:55 AM
around this issue I don't know a plugin that implements it. But you can easily extend the lamp plugin.
You could extend the interface ILamp like
public interface ILamp
{
    ///....
    void TurnOn(float intensity);
}
public void TurnOn(float intensity)
{
    var captureDevice = AVCaptureDevice.DefaultDeviceWithMediaType(AVMediaType.Video);
    if (captureDevice == null)
    {
      Debug.WriteLine("No captureDevice - this won't work on the simulator, try a physical device");
      return;
    }

    NSError error = null;
    captureDevice.LockForConfiguration(out error);
    if (error != null)
    {
      Debug.WriteLine(error);
      captureDevice.UnlockForConfiguration();
      return;
    }
    else
    {
      if (captureDevice.TorchMode != AVCaptureTorchMode.On)
      {
        captureDevice.TorchMode = AVCaptureTorchMode.On;
        NSError err;
        captureDevice.SetTorchModeLevel(intensity, out err); // add this line
      }
      captureDevice.UnlockForConfiguration();
    }
}
public void TurnOn(float intensity)
{
    TurnOn();       
}

Daily light integral from 20s light intensity MySQL records


Tag : mysql , By : Reiner
Date : March 29 2020, 07:55 AM
This might help you Here is a little sample with a table with 3 columns (id, timestamp, cnt)
then you can calculate it like this:
SELECT p.id, p.mytime, p.photons, l.photons
,TIMESTAMPDIFF(SECOND, l.mytime, p.mytime) diffsecs
,p.photons * COALESCE(TIMESTAMPDIFF(SECOND, l.mytime, p.mytime),1) as cnt
FROM photons p
LEFT JOIN photons l ON p.id -1 = l.id
ORDER BY p.id;

SELECT SUM( p.photons * COALESCE(TIMESTAMPDIFF(SECOND, l.mytime, p.mytime),1)) as cnt
FROM photons p
LEFT JOIN photons l ON p.id -1 = l.id
ORDER BY p.id;
mysql> describe photons;
+---------+------------------+------+-----+---------+----------------+
| Field   | Type             | Null | Key | Default | Extra          |
+---------+------------------+------+-----+---------+----------------+
| id      | int(11) unsigned | NO   | PRI | NULL    | auto_increment |
| mytime  | timestamp        | YES  | MUL | NULL    |                |
| photons | int(11)          | YES  |     | NULL    |                |
+---------+------------------+------+-----+---------+----------------+
3 rows in set (0.00 sec)

mysql> select * from photons;
+----+---------------------+---------+
| id | mytime              | photons |
+----+---------------------+---------+
|  1 | 2020-02-26 12:00:00 |     100 |
|  2 | 2020-02-26 12:00:25 |      80 |
|  3 | 2020-02-26 12:01:00 |     100 |
|  4 | 2020-02-26 12:05:00 |     200 |
|  5 | 2020-02-26 12:05:03 |      22 |
+----+---------------------+---------+
5 rows in set (0.00 sec)

mysql> SELECT p.id, p.mytime, p.photons, l.photons
    -> ,TIMESTAMPDIFF(SECOND, l.mytime, p.mytime) diffsecs
    -> ,p.photons * COALESCE(TIMESTAMPDIFF(SECOND, l.mytime, p.mytime),1) as cnt
    -> FROM photons p
    -> LEFT JOIN photons l ON p.id -1 = l.id
    -> ORDER BY p.id;
+----+---------------------+---------+---------+----------+-------+
| id | mytime              | photons | photons | diffsecs | cnt   |
+----+---------------------+---------+---------+----------+-------+
|  1 | 2020-02-26 12:00:00 |     100 |    NULL |     NULL |   100 |
|  2 | 2020-02-26 12:00:25 |      80 |     100 |       25 |  2000 |
|  3 | 2020-02-26 12:01:00 |     100 |      80 |       35 |  3500 |
|  4 | 2020-02-26 12:05:00 |     200 |     100 |      240 | 48000 |
|  5 | 2020-02-26 12:05:03 |      22 |     200 |        3 |    66 |
+----+---------------------+---------+---------+----------+-------+
5 rows in set (0.00 sec)

mysql> SELECT SUM( p.photons * COALESCE(TIMESTAMPDIFF(SECOND, l.mytime, p.mytime),1)) as cnt
    -> FROM photons p
    -> LEFT JOIN photons l ON p.id -1 = l.id
    -> ORDER BY p.id;
+-------+
| cnt   |
+-------+
| 53666 |
+-------+
1 row in set (0.00 sec)

mysql> 

iPhone light sensor vs camera to measure the light intensity


Tag : iphone , By : Naveen
Date : March 29 2020, 07:55 AM
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