This can be accomplished by writing a little code. I created a class that derives from Gauge and exposed two properties; MaxPointerColor and MaxPointerValue. To use the class, drop a Gauge and change the line in InitializeComponent to instantiate the MultiplePointerGauge instead. You can still use the designer to configure the gauge after this change. To do this with a Meter you can follow the same pattern.
public class MultiplePointerGauge : Gauge
{
private double _maxPointerValue;
private Color _maxPointerColor;
public MultiplePointerGauge() : base()
{
GaugeStyle = new MultiplePointersStyle();
_maxPointerColor = PointerColor;
_maxPointerValue = Value;
}
public Color MaxPointerColor
{
get
{
return _maxPointerColor;
}
set
{
_maxPointerColor = value;
Invalidate();
}
}
public double MaxPointerValue
{
get
{
return _maxPointerValue;
}
set
{
_maxPointerValue = value;
Invalidate();
}
}
private class MultiplePointersStyle : GaugeStyle
{
private GaugeStyle _baseStyle;
public MultiplePointersStyle() : this(GaugeStyle.SunkenWithThickNeedle3D)
{
}
public MultiplePointersStyle(GaugeStyle baseStyle)
{
if(baseStyle == null)
throw new ArgumentNullException("baseStyle");
_baseStyle = baseStyle;
}
public override void DrawSpindle(IGauge context, RadialNumericPointerStyleDrawArgs args)
{
_baseStyle.DrawSpindle(context, args);
}
public override float GetDialRadius(IRadialNumericPointer context,
Graphics graphics, Rectangle bounds)
{
return _baseStyle.GetDialRadius(context, graphics, bounds);
}
public override void DrawDial(IRadialNumericPointer context,
RadialNumericPointerStyleDrawArgs args)
{
_baseStyle.DrawDial(context, args);
}
public override RadialNumericPointerHitTestInfo HitTest(IRadialNumericPointer context,
Rectangle bounds, int x, int y)
{
return _baseStyle.HitTest(context, bounds, x, y);
}
public override void DrawPointer(INumericPointer context,
NumericPointerStyleDrawArgs args, double value)
{
MultiplePointerGauge gauge = context as MultiplePointerGauge;
Color defaultColor = context.PointerColor;
_baseStyle.DrawPointer(context, args, value);
context.PointerColor = gauge.MaxPointerColor;
_baseStyle.DrawPointer(context, args, gauge.MaxPointerValue);
context.PointerColor = defaultColor;
}
public override float GetScaleRadius(IRadialNumericPointer context,
Graphics graphics, Rectangle bounds)
{
return _baseStyle.GetScaleRadius (context, graphics, bounds);
}
}
}
