public PerfChart()
{
InitializeComponent();
// Initialize Variables
perfChartStyle = new PerfChartStyle();
perfChartPenStyles = new PerfChartPenStyle[4];
perfChartPenStyles[0] = new PerfChartPenStyle();
perfChartPenStyles[1] = new PerfChartPenStyle();
perfChartPenStyles[2] = new PerfChartPenStyle();
perfChartPenStyles[3] = new PerfChartPenStyle();
chartSize = 500;
drawValues = new List <DataSample>(chartSize);
waitingValues = new ConcurrentQueue <DataSample>();
// Set Optimized Double Buffer to reduce flickering
this.SetStyle(ControlStyles.UserPaint, true);
this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
// Redraw when resized
this.SetStyle(ControlStyles.ResizeRedraw, true);
this.Font = SystemInformation.MenuFont;
}
/// <summary>
/// Calculates the vertical Position of a value in relation the chart size,
/// Scale Mode and, if ScaleMode is Relative, to the current maximum value
/// </summary>
/// <param name="value">performance value</param>
/// <returns>vertical Point position in Pixels</returns>
private double CalcVerticalPosition(PerfChartPenStyle pt, Int32 value)
{
double result = 0;
if (pt.ScaleMode == ScaleMode.Absolute)
{
result = (((double)value + pt.Offset) / pt.Scale) * (double)this.Height;
}
else if (pt.ScaleMode == ScaleMode.Relative)
{
result = (pt.currentMaxValue > 0) ? (value * this.Height / pt.currentMaxValue) : 0;
}
// Invert the graph to have Y going up
result = this.Height - result;
return(result);
}