void acqEngine_OverviewWaveform(Waveform f)
{
displayOverview.horizontalScale = f.Horizontal[f.Samples - 1] / 10;
displayOverview.horizontalOffset = displayOverview.horizontalScale * displayOverview.horizontalDivisions;
displayOverview.Add(f);
// Update dmm:
float currentMin = float.MaxValue;
float currentMax = float.MinValue;
float currentRms = 0;
float currentMean = 0;
for (int k = 0; k < f.Samples; k++)
{
var c = f.Data[0][k];
currentMin = Math.Min(currentMin, c);
currentMax = Math.Max(currentMax, c);
currentRms += c * c;
currentMean += c;
}
currentMean /= f.Samples;
currentRms *= f.Horizontal[1] - f.Horizontal[0];
currentRms /= f.Horizontal[f.Samples - 1];
currentRms = (float)Math.Sqrt(currentRms);
dmm.meanCurrent = currentMean;
dmm.rmsCurrent = currentRms;
dmm.minCurrent = currentMin;
dmm.maxCurrent = currentMax;
dmm.sixDigitVoltage = acqEngine.LastVoltageMeasurent;
overviewRefresh = true;
}
void acqEngine_Waveform(Waveform f)
{
displayTrig.Add(f);
triggerOk = true;
}
void acqEngine_OverviewWaveform(Waveform f)
{
displayOverview.horizontalScale = f.Horizontal[f.Samples - 1]/10;
displayOverview.horizontalOffset = displayOverview.horizontalScale * displayOverview.horizontalDivisions;
displayOverview.Add(f);
// Update dmm:
float currentMin = float.MaxValue;
float currentMax = float.MinValue;
float currentRms = 0;
float currentMean = 0;
for(int k = 0; k < f.Samples;k ++)
{
var c = f.Data[0][k];
currentMin = Math.Min(currentMin, c);
currentMax = Math.Max(currentMax, c);
currentRms += c*c;
currentMean += c;
}
currentMean /= f.Samples;
currentRms *= f.Horizontal[1] - f.Horizontal[0];
currentRms /= f.Horizontal[f.Samples - 1];
currentRms = (float)Math.Sqrt(currentRms);
dmm.meanCurrent = currentMean;
dmm.rmsCurrent = currentRms;
dmm.minCurrent = currentMin;
dmm.maxCurrent = currentMax;
dmm.sixDigitVoltage = acqEngine.LastVoltageMeasurent;
overviewRefresh = true;
}
public void Add(Waveform waveform)
{
waveforms.Enqueue(waveform);
}
protected override void OnPaint(PaintEventArgs e)
{
if (waveforms.Count == 0)
{
return;
}
base.OnPaint(e);
Stopwatch sw = new Stopwatch();
sw.Start();
var w = e.ClipRectangle.Width;
var h = e.ClipRectangle.Height;
if (w < 1)
{
w = 1;
}
var graph = new Bitmap(w, h, PixelFormat.Format32bppArgb);
var g = Graphics.FromImage(graph);
g.CompositingQuality = CompositingQuality.HighSpeed;
g.CompositingMode = CompositingMode.SourceCopy;
//g.FillRectangle(Brushes.Black, e.ClipRectangle);
var pxPerHorizontalDivision = w / 2 / horizontalDivisions;
var offsetHorizontalDivision = w / 2 - (pxPerHorizontalDivision * horizontalDivisions);
var pxPerVerticalDivision = h / 2 / verticalDivisions;
var offsetVerticalDivision = h / 2 - (pxPerVerticalDivision * verticalDivisions);
// Draw grid
for (int div = -horizontalDivisions; div <= horizontalDivisions; div++)
{
var x = offsetHorizontalDivision + pxPerHorizontalDivision * (horizontalDivisions + div);
var y = offsetVerticalDivision + pxPerVerticalDivision * verticalDivisions * 2;
g.DrawLine((div == 0) ? gridCenterPen : gridPen, x, offsetVerticalDivision, x, y);
}
for (int div = -verticalDivisions; div <= verticalDivisions; div++)
{
var x = offsetHorizontalDivision + pxPerHorizontalDivision * horizontalDivisions * 2;
var y = offsetVerticalDivision + pxPerVerticalDivision * (verticalDivisions + div);
g.DrawLine((div == 0) ? gridCenterPen : gridPen, offsetHorizontalDivision, y, x, y);
}
var graphWidth = w - offsetHorizontalDivision * 2;
var graphHeight = h - offsetVerticalDivision * 2;
if (overhead < 0)
{
overhead = sw.ElapsedMilliseconds;
}
else
{
overhead = overhead / 2.0f + sw.ElapsedMilliseconds / 2.0f;
}
List <Waveform> myWaveforms = new List <Waveform>();
lock (waveformsMutex)
{
// myWaveforms = new List<Waveform>(waveforms);
Waveform f = default(Waveform);
while (waveforms.TryDequeue(out f))
{
myWaveforms.Add(f);
}
//if (myWaveforms.Count >= 500)
// myWaveforms.RemoveRange(0, myWaveforms.Count - 501);
}
var compressionRatio = 1;
try
{
// Display all waveforms
// To do that, we map all waveforms to an displayTrig array
// This array contains the X,Y intensity data per channel
// intensity[channel][x position][y position] = number of hits
// The number of hits will later determine which pencil is used for drawing.
// Which in term makes the specific pixel brighter or dimmer.
int[][][] intensity = new int[channels][][];
for (var ch = 0; ch < channels; ch++)
{
var arr = new int[w][];
for (var x = 0; x < w; x++)
{
arr[x] = new int[h];
}
intensity[ch] = arr;
}
foreach (var wave in myWaveforms)
{
// Process may interpolate the waveform if not enough samples are available.
// The draw engine is only capable of doing dots mode.
if (DotsOnly)
{
wave.Process(w);
}
// The compression ratio is applicable when there are more samples to displayTrig than displayTrig width is available.
// This will mean that it's possible more than 1 sample is displayed on the same X position.
// This can increase the number of hits on that specific pixel, and therefor an compression ratio is used.
// It's a compromise between detail & accuracy. Higher resolution = better accuracy, at all times.
// But also slower to draw.
compressionRatio = Math.Max(wave.Samples / w, compressionRatio);
for (var ch = 0; ch < channels; ch++)
{
var lastX = -1;
var lastY = -1;
var sameX = 0;
int yCenter = (int)((verticalDivisions - verticalOffset[ch]) * pxPerVerticalDivision);
for (int s = 0; s < wave.Samples; s++)
{
var waveTime = wave.Horizontal[s] - wave.TriggerTime;
// Calculate X position on screen. Check in bounds.
var x =
(int)
Math.Round(((waveTime - horizontalOffset) / horizontalScale + horizontalDivisions) *
pxPerHorizontalDivision);
if (x < 0)
{
continue;
}
if (x == graphWidth)
{
x = graphWidth - 1;
}
if (x > graphWidth)
{
break;
}
// Calculate Y position on screen. Check in bounds.
var y = (int)((wave.Data[ch][s] / -verticalScale[ch]) * pxPerVerticalDivision) + yCenter;
if (y < 0)
{
y = 0;
}
if (y > graphHeight)
{
y = graphHeight - 1;
}
// Make a hit for this pixel.
if (lastX >= 0 && !DotsOnly)
{
var dx = x - lastX;
var dy = y - lastY;
if (Math.Abs(dx) > Math.Abs(dy))
{
if (dx > 0)
{
for (var xInterpolated = 0; xInterpolated < dx; xInterpolated++)
{
var yInterpolated = y - dy * xInterpolated / dx;
intensity[ch][x - xInterpolated][yInterpolated]++;
}
}
else
{
for (var xInterpolated = 0; xInterpolated < -dx; xInterpolated++)
{
var yInterpolated = y + dy * xInterpolated / dx;
intensity[ch][x - xInterpolated][yInterpolated]++;
}
}
}
else
{
if (dy > 0)
{
for (var yInterpolated = 0; yInterpolated < dy; yInterpolated++)
{
var xInterpolated = lastX + dx * yInterpolated / dy;
try
{
intensity[ch][xInterpolated][lastY + yInterpolated]++;
}
catch
{
}
}
}
else
{
for (var yInterpolated = 0; yInterpolated < -dy; yInterpolated++)
{
var xInterpolated = lastX + dx * yInterpolated / -dy;
try
{
var y_ = Math.Min(graphHeight - 1, lastY - yInterpolated);
intensity[ch][xInterpolated][y_]++;
}
catch
{
}
}
}
}
if (lastX != x)
{
sameX = 2;
}
else
{
sameX++;
}
//compressionRatio = Math.Max(sameX, compressionRatio);
}
else
{
intensity[ch][x][y]++;
}
lastX = x;
lastY = y;
}
}
}
//compressionRatio = 1;
// Lock bits on map
// This is used for a much much faster setpixel performance. The bitmap is accesisable via a raw byte arrya, containing bit information.
// The format of this array depends on the pixelformat, which is 32-bit R-G-B-A.
// Alpha seems to be broken, so we modulate the alpha via the pencil.
var dat = graph.LockBits(e.ClipRectangle, ImageLockMode.ReadWrite, graph.PixelFormat);
var ptr = dat.Scan0;
var bytesPerPixel = 4;
byte[] bitmapBuffer = new byte[w * h * bytesPerPixel];
Marshal.Copy(ptr, bitmapBuffer, 0, bitmapBuffer.Length);
// From here, we must edit our image in the bitmapBuffer, intead via the bitmap normal API routines.
var k = 0;
// We take the hit map
foreach (var channel in intensity)
{
var chColor = channelColors[k++];
var noOfPens = myWaveforms.Count * compressionRatio + 1;
var penPallette = new byte[noOfPens][];
// Generate a set of color.
for (int i = 0; i < noOfPens; i++)
{
// The accurateness and contrast of the intensity graded displayTrig can be changed here.
// With the SQRT less-freuqent signals are "amplified" and more frequent signals are compressed.
// The offset will also determine how visible less frequent options are seen.
var perc = 0.0f;
if (lowContrast)
{
perc = (float)Math.Pow(i * 1.0f / compressionRatio, 0.5) * 100.0f + 5.0f;
}
else
{
perc = (float)Math.Pow(i * 1.0f / noOfPens / compressionRatio, 0.5) * 100.0f + 10.0f;
}
// Fix perc if <0% or >100% or "ERR"
if (perc >= 100)
{
perc = 100;
}
if (perc <= 0)
{
perc = 0;
}
if (float.IsNaN(perc) || float.IsInfinity(perc))
{
perc = 100;
}
// Colors are saved raw too, because this is faster to access.
var c = new byte[4]
{
(byte)(chColor[2] * perc / 100),
(byte)(chColor[1] * perc / 100),
(byte)(chColor[0] * perc / 100),
255
};
penPallette[i] = c;
}
// Walk through the entire "image"
for (var x = 0; x < w; x++)
{
for (var y = 0; y < h; y++)
{
var chVal = (int)(channel[x][y]);
if (chVal > 0)
{
// We only modify when there was a hit here.
// i contains the index inside the bitmapBuffer we must edit.
var i = (y + offsetVerticalDivision) * w + x + offsetHorizontalDivision;
i *= bytesPerPixel;
// We pick a color
if (chVal >= noOfPens)
{
chVal = noOfPens - 1;
}
var c = penPallette[chVal];
// And copy it.
bitmapBuffer[i] = c[0]; // blue
bitmapBuffer[i + 1] = c[1]; // green
bitmapBuffer[i + 2] = c[2]; // red
bitmapBuffer[i + 3] = c[3]; // alpha
}
}
}
}
Marshal.Copy(bitmapBuffer, 0, ptr, bitmapBuffer.Length);
graph.UnlockBits(dat);
e.Graphics.DrawImage(graph, 0, 0);
}
catch
{
}
sw.Stop();
waveformsCount += myWaveforms.Count;
renderTime += (float)sw.ElapsedMilliseconds;
var dt = DateTime.Now.Subtract(lastWfmsMeasurement);
if (dt.TotalMilliseconds > 500 && waveformsCount > 10)
{
var wfms = waveformsCount / (dt.TotalMilliseconds / 1000.0f);
lastMeasurement = wfms.ToString("0000.0 wfms") + " [" + renderTime + "/" + dt.TotalMilliseconds.ToString("000") + "ms] [" + Math.Round(myWaveforms[0].Samples * wfms) + "sps]";
lastMeasurementColor = renderTime >= dt.TotalMilliseconds - 10 ? Brushes.Red :
renderTime * 1.2 >= dt.TotalMilliseconds ? Brushes.Orange : Brushes.White;
waveformsCount = 0;
lastWfmsMeasurement = DateTime.Now;
renderTime = 0;
}
e.Graphics.DrawString(lastMeasurement, new Font("Verdana", 7), lastMeasurementColor, 0, 0);
if (speed < 0)
{
speed = sw.ElapsedMilliseconds;
}
else
{
speed = speed * 0.6f + sw.ElapsedMilliseconds * 0.4f;
}
measurements++;
}
public void Add(Waveform waveform)
{
waveforms.Enqueue(waveform);
}
void acqEngine_Waveform(Waveform f)
{
displayTrig.Add(f);
triggerOk = true;
}