private async Task UpdateDisplay(string value)
{
double dval = Convert.ToDouble(value);
string txt = String.Format("{0:F2} {1}", dval, unit);
CurVal.Text = txt;
if (display != null)
{
long start = DateTime.Now.Ticks;
try {
await l0.clear();
await l0.drawText(w - 1, h / 2, YDisplayLayer.ALIGN.CENTER_RIGHT, txt);
await display.swapLayerContent(0, 1);
} catch (YAPI_Exception ex) {
await FatalError(ex.Message);
}
long stop = DateTime.Now.Ticks;
long delta = (stop - start) / 1000;
if (delta > 50)
{
Debug.WriteLine("screen update took {0}ms", delta);
}
}
}
/**
* <summary>
* Swaps the whole content of two layers.
* <para>
* The color and transparency of all the pixels from
* the two layers are swapped. This method only affects the displayed content, but does
* not change any property of the layer objects. In particular, the visibility of each
* layer stays unchanged. When used between one hidden layer and a visible layer,
* this method makes it possible to easily implement double-buffering.
* Note that layer 0 has no transparency support (it is always completely opaque).
* </para>
* </summary>
* <param name="layerIdA">
* the first layer (a number in range 0..layerCount-1)
* </param>
* <param name="layerIdB">
* the second layer (a number in range 0..layerCount-1)
* </param>
* <returns>
* <c>0</c> if the call succeeds.
* </returns>
* <para>
* On failure, throws an exception or returns a negative error code.
* </para>
*/
public virtual int swapLayerContent(int layerIdA, int layerIdB)
{
if (_func == null)
{
throw new YoctoApiProxyException("No Display connected");
}
return(_func.swapLayerContent(layerIdA, layerIdB));
}
static void Main(string[] args)
{
Console.WriteLine("Console dotNET Application 0.1.0");
Console.WriteLine("--------------------------------");
Console.WriteLine("");
Console.WriteLine("Using Yoctopuce lib " + YAPI.GetAPIVersion());
string errsmg = "";
if (YAPI.RegisterHub("usb", ref errsmg) != YAPI.SUCCESS)
{
Console.WriteLine("Unable to register the USB port :" + errsmg);
return;
}
YSensor sensor = YSensor.FirstSensor();
if (sensor == null)
{
Console.WriteLine("No Yoctopuce sensor find on USB.");
return;
}
YDisplay display = YDisplay.FirstDisplay();
if (display == null)
{
Console.WriteLine("No Yoctopuce display find on USB.");
return;
}
// display clean up
display.resetAll();
YDisplayLayer l1 = display.get_displayLayer(1);
l1.hide(); // L1 is hidden, l2 stay visible
int w = display.get_displayWidth();
int h = display.get_displayHeight();
while (sensor.isOnline() && display.isOnline())
{
string value = sensor.get_currentValue() + " " + sensor.get_unit();
string name = sensor.get_friendlyName();
// display a text in the middle of the screen
l1.clear();
l1.selectFont("Large.yfm");
l1.drawText(w / 2, h / 2, YDisplayLayer.ALIGN.CENTER, value);
l1.selectFont("Small.yfm");
l1.drawText(w - 1, h - 1, YDisplayLayer.ALIGN.BOTTOM_RIGHT, name);
display.swapLayerContent(0, 1);
Console.WriteLine(name + " ->" + value);
YAPI.Sleep(500, ref errsmg);
}
YAPI.FreeAPI();
}
public void RePaint()
{
_display.swapLayerContent(1, 2);
}