private void PeriodicTimerCallback(ThreadPoolTimer timer)
{
if (ValueChangeCompleted == null)
{
return;
}
if (_simulatorGoingUp)
{
_startSimulatorValue = (ushort)(_startSimulatorValue + _stepSimulatorValue);
if (_startSimulatorValue > _maxSimulatorValue)
{
_startSimulatorValue = _maxSimulatorValue;
_simulatorGoingUp = false;
}
}
else
{
_startSimulatorValue = (ushort)(_startSimulatorValue - _stepSimulatorValue);
if (_startSimulatorValue < _minSimulatorValue)
{
_startSimulatorValue = _minSimulatorValue;
_simulatorGoingUp = true;
}
}
ValueChangeCompleted(HeartbeatMeasurement.GetHeartbeatMeasurementFromData(_startSimulatorValue, DateTimeOffset.Now));
}
private void Oncharacteristic_ValueChanged(GattCharacteristic sender, GattValueChangedEventArgs args)
{
var data = new byte[args.CharacteristicValue.Length];
DataReader.FromBuffer(args.CharacteristicValue).ReadBytes(data);
if (ValueChangeCompleted != null)
{
ValueChangeCompleted(HeartbeatMeasurement.GetHeartbeatMeasurementFromData(data, args.Timestamp));
}
}
//find where in graph image each values would correspond to and add this info to a new array
private List<DataPoint> FillOffsetList(HeartbeatMeasurement[] dataSet, RenderingOptions options, float Width, float Height)
{
if (dataSet == null || dataSet.Length <= 0)
{
return null;
}
var valueDiff = options.MaxValue - options.MinValue;
float tickOffset = (Width / dataSet.Length);
List<DataPoint> offsetList = new List<DataPoint>();
float currentOffset = 0;
for (int i = 0; i < dataSet.Length; i++)
{
var currentDiff = options.MaxValue - dataSet[i].HeartbeatValue;
offsetList.Add(new DataPoint
{
OffsetX = currentOffset,
OffsetY = (currentDiff / valueDiff) * Height,
Value = dataSet[i].HeartbeatValue //just in case we would have functionality to show the actual value, we'll store it here
});
currentOffset += tickOffset;
}
return offsetList;
}
private void DrawCharData(CanvasDevice device, RenderingOptions options, HeartbeatMeasurement[] data)
{
//Size restrictions descriped in : http://microsoft.github.io/Win2D/html/P_Microsoft_Graphics_Canvas_CanvasDevice_MaximumBitmapSizeInPixels.htm
float useHeight = (float)ChartWin2DCanvas.Size.Height > device.MaximumBitmapSizeInPixels ? device.MaximumBitmapSizeInPixels : (float)ChartWin2DCanvas.Size.Height;
float useWidth = data.Length > device.MaximumBitmapSizeInPixels ? device.MaximumBitmapSizeInPixels : data.Length;
//this will change the values array to array with drawing-line-points for the graph
List<DataPoint> dataList = FillOffsetList(data, options, useWidth, useHeight);
//reset zoom & moving values
_zoomFactor = 100;
_graphDrawingPoint = new Point(0, 0);
_graphDrawingSource = new Size(useWidth, useHeight);
//create the graph image
_offscreenChartImage = new CanvasRenderTarget(device, useWidth, useHeight, 96);
using (CanvasDrawingSession ds = _offscreenChartImage.CreateDrawingSession())
{
//This creates drawing geometry from the drawing-line-points
CanvasGeometry chart = getDrawChartGeometry(device, dataList);
//and then we simply draw it with defined color
ds.DrawGeometry(chart, 0, 0, GRAPG_COLOR);
}
}
private RenderingOptions CreateRenderingOptions(HeartbeatMeasurement[] dataSet)
{
RenderingOptions renderingOptions = null;
if (dataSet != null)
{
renderingOptions = new RenderingOptions();
//set initial end-of-range values
renderingOptions.MinValue = double.MaxValue;
renderingOptions.MaxValue = double.MinValue;
//find if we have bigger or smaller than what we have with current values
for (int i = 0; i < dataSet.Length; i++)
{
renderingOptions.MinValue = Math.Min(dataSet[i].HeartbeatValue, renderingOptions.MinValue);
renderingOptions.MaxValue = Math.Max(dataSet[i].HeartbeatValue, renderingOptions.MaxValue);
}
//and see if default values are more suitable
if (renderingOptions.MinValue > MIN_VALUE_DEFAULT)
{
renderingOptions.MinValue = MIN_VALUE_DEFAULT;
}
if (renderingOptions.MaxValue < MAX_VALUE_DEFAULT)
{
renderingOptions.MaxValue = MAX_VALUE_DEFAULT;
}
var valueDiff = renderingOptions.MaxValue - renderingOptions.MinValue;
var diffBuffer = (valueDiff > 0) ? (valueDiff * 0.1) : 2;
//values used with value texts
renderingOptions.MaxValueBuffered = renderingOptions.MaxValue + diffBuffer;
renderingOptions.MinValueBuffered = renderingOptions.MinValue - diffBuffer;
renderingOptions.MinValueBuffered = (renderingOptions.MinValueBuffered > 0) ? renderingOptions.MinValueBuffered : 0;
}
return renderingOptions;
}
// this is called externally to give us the data for the graph
public void PlotChart(HeartbeatMeasurement[] data)
{
_data = data;
DrawChart();
}
private async void Instance_ValueChangeCompleted(HeartbeatMeasurement HeartbeatMeasurementValue)
{
System.Diagnostics.Debug.WriteLine("got heartbeat : " + HeartbeatMeasurementValue.HeartbeatValue);
// Serialize UI update to the the main UI thread.
await this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
if (progressGrid.Visibility == Visibility.Visible)
{
SetWaitVisibility(false);
}
chartControlOne.AddChartData(HeartbeatMeasurementValue);
});
}
public void AddChartData(HeartbeatMeasurement HeartbeatMeasurementValue)
{
// lets put the value into the UI control
HeartbeatValueBox.Text = "" + HeartbeatMeasurementValue.HeartbeatValue;
//we need to store it in an array in order to visualize the values with graph
_data.Add(HeartbeatMeasurementValue);
ReDrawChart();
}
public void PlotChart(HeartbeatMeasurement[] data)
{
// First set the data points that we are going to render
// The functions will use this data to plot the chart
_data = data;
//then do the full drawing
DrawAll();
}
