/// <summary>
/// Returns a color between begin and end color. The coff parameter must be in the range [0, 1].
/// </summary>
/// <param name="begin"></param>
/// <param name="end"></param>
/// <param name="coeff"></param>
/// <returns></returns>
public static NArgbColorValue InterpolateColors(NArgbColorValue begin, NArgbColorValue end, float coeff)
{
int a1 = (int)((begin.Value >> 24) & 0xff);
int r1 = (int)((begin.Value >> 16) & 0xff);
int g1 = (int)((begin.Value >> 8) & 0xff);
int b1 = (int)(begin.Value & 0xff);
int a2 = (int)((end.Value >> 24) & 0xff);
int r2 = (int)((end.Value >> 16) & 0xff);
int g2 = (int)((end.Value >> 8) & 0xff);
int b2 = (int)(end.Value & 0xff);
int a3 = a1 + (int)((a2 - a1) * coeff);
int r3 = r1 + (int)((r2 - r1) * coeff);
int g3 = g1 + (int)((g2 - g1) * coeff);
int b3 = b1 + (int)((b2 - b1) * coeff);
return(new NArgbColorValue((UInt32)((r3 << 16) | (g3 << 8) | b3 | (a3 << 24))));
}
private void UpdateData()
{
int dataPointCount = 0;
switch (DataPointCountPerLineComboBox.SelectedIndex)
{
case 0:
dataPointCount = 10000;
break;
case 1:
dataPointCount = 100000;
break;
case 2:
dataPointCount = 500000;
break;
}
int lineCount = (int)NumberOfLinesUpDown.Value;
NChart chart = nChartControl1.Charts[0];
chart.Series.Clear();
Random random = new Random();
NChartPalette palette = new NChartPalette(ChartPredefinedPalette.Fresh);
for (int lineIndex = 0; lineIndex < lineCount; lineIndex++)
{
// setup surface series
NVertexSurfaceSeries surface = new NVertexSurfaceSeries();
chart.Series.Add(surface);
surface.Name = "Surface";
surface.SyncPaletteWithAxisScale = false;
surface.PaletteSteps = 8;
surface.ValueFormatter.FormatSpecifier = "0.00";
surface.FillMode = SurfaceFillMode.CustomColors;
surface.FrameMode = SurfaceFrameMode.Dots;
surface.FrameColorMode = SurfaceFrameColorMode.CustomColors;
surface.VertexPrimitive = VertexPrimitive.LineStrip;
surface.Data.UseColors = true;
surface.Data.SetCapacity(dataPointCount);
double x = 0.1;
double y = 0;
double z = 0;
double a = 10.0;
double b = 18 + lineIndex; // 28.0 - ;
double c = (lineIndex + 3) / 3.0; //8.0
double t = lineIndex * (0.01 / lineCount) + 0.01;
NArgbColorValue color1 = new NArgbColorValue(palette.SeriesColors[lineIndex % palette.SeriesColors.Count]);
NArgbColorValue color2 = new NArgbColorValue(palette.SeriesColors[(lineIndex + 1) % palette.SeriesColors.Count]);
unsafe
{
fixed(byte *pData = &surface.Data.Data[0])
{
float *pVertex = (float *)pData;
uint * pColor = (uint *)(pData + surface.Data.ColorOffset * 4);
for (int dataPointIndex = 0; dataPointIndex < dataPointCount; dataPointIndex++)
{
float xt = (float)(x + t * a * (y - x));
float yt = (float)(y + t * (x * (b - z) - y));
float zt = (float)(z + t * (x * y - c * z));
pVertex[0] = xt;
pVertex[1] = yt;
pVertex[2] = zt;
*pColor = InterpolateColors(color1, color2, (float)((yt + 40.0) / 80.0)).Value;
pVertex += 4;
pColor += 4;
x = xt;
y = yt;
z = zt;
}
}
}
// notify series that data has changed as we've modified it directly using pointers
surface.Data.SetCount(dataPointCount);
}
nChartControl1.Refresh();
}
