private void timer_display_Tick(object sender, EventArgs e)
{
signal_element[] src_signal = new signal_element[1];
lock (this.src_wave)
{
if (this.src_wave.Count > 0)
{
src_signal = new signal_element[this.src_wave.Count];
this.src_wave.CopyTo(src_signal);
}
}
if (src_signal.Length > 1)
{
// ------------------------------------
double[] src_signal_y = new double[src_signal.Length];
for (int i = 0; i < src_signal.Length; i++)
{
src_signal_y[i] = src_signal[i].magnitude;
}
this.plt_signal.xOffset = src_signal[0].time;
this.plt_signal.ys = src_signal_y;
this.plt_signal.maxRenderIndex = src_signal_y.Length - 1;
if (this.clock_s() - this.last_time_mouse_on_chart_signal_s > 5.0)
{
this.chart_signal.plt.AxisAuto();
}
this.chart_signal.Render();
// ------------------------------------
// FFT
model.FourierTool f_tool = new model.FourierTool();
model.FourierTool.Result fft_result = f_tool.FFT(src_signal_y, 1000);
// ------------------------------------
if (fft_result.y_magnitude.Length > 0)
{
this.plt_fft.ys = fft_result.y_magnitude;
this.plt_fft.maxRenderIndex = fft_result.y_magnitude.Length - 1;
this.plt_fft.samplePeriod = fft_result.hz_per_sample;
this.chart_fft.plt.Axis(x1: 0, x2: 30);
this.chart_fft.plt.AxisAutoY();
}
else
{
this.plt_fft.maxRenderIndex = 1;
}
this.chart_fft.Render();
// ------------------------------------
}
}
private void bg_fake_data_DoWork(object sender, DoWorkEventArgs e)
{
// generate signal
// sample rate 1k Hz
// frequency can be chose by radio button (5, 10, 15 hz)
// The signal length will increase up to 10s
System.Diagnostics.Stopwatch watch = new System.Diagnostics.Stopwatch();
watch.Start();
long last_time_gen_fake_data = watch.ElapsedMilliseconds;
while (true)
{
// -----------------------------------
long time_now_ms = watch.ElapsedMilliseconds;
int ms = Convert.ToInt32(time_now_ms - last_time_gen_fake_data);
last_time_gen_fake_data = time_now_ms;
if (ms == 0)
{
continue;
}
// -----------------------------------
double time_now_s = (double)time_now_ms / 1000.0;
// -----------------------------------
double frequency = 1.0;
if (this.rbtn_5hz.Checked)
{
frequency = 5.0;
}
else if (this.rbtn_10hz.Checked)
{
frequency = 10.0;
}
else if (this.rbtn_15hz.Checked)
{
frequency = 15.0;
}
// -----------------------------------
List <signal_element> add_data = new List <signal_element>();
for (int i = ms; i > 0; i--)
{
double t = time_now_s - (i - 1) * 0.001;
signal_element s_elem = new signal_element(t, this.signal_mag * Math.Cos(t * (2 * Math.PI) * frequency));
add_data.Add(s_elem);
}
// -----------------------------------
lock (this.src_wave)
{
this.src_wave.AddRange(add_data);
while (this.src_wave.Last().time - this.src_wave.First().time > 10.0) // 10s
{
this.src_wave.RemoveAt(0);
}
}
// -----------------------------------
System.Threading.Thread.Sleep(1);
// -----------------------------------
if (this.bg_fake_data.CancellationPending)
{
break;
}
}
}
