This request concerns adding a new control called RadGauge to RadControls for WinForms. Similar controls for Silverlight can be observed at this link - http://demos.telerik.com/silverlight/#Gauge/Gallery/LinearScale

Please run the attached sample project and follow the steps illustrated in the attached gif file. The following exception occurs:

System.ArgumentException
  HResult=0x80070057
  Message=Rectangle '{X=0,Y=35,Width=156.3333,Height=0}' cannot have a width or height equal to 0.
  Source=System.Drawing
  StackTrace:
   at System.Drawing.Drawing2D.LinearGradientBrush..ctor(RectangleF rect, Color color1, Color color2, Single angle, Boolean isAngleScaleable)
   at System.Drawing.Drawing2D.LinearGradientBrush..ctor(RectangleF rect, Color color1, Color color2, Single angle)
   at Telerik.WinControls.UI.Gauges.LinearGaugeBrushFactory.CreateBrush(GaugeVisualElement owner, GaugeBrushType type)
   at Telerik.WinControls.UI.Gauges.LinearGaugeBar.Paint(Graphics graphics, Rectangle boundingRectangle)
   at Telerik.WinControls.UI.Gauges.LinearGaugeBar.PaintElement(IGraphics graphics, Single angle, SizeF scale)
   at Telerik.WinControls.RadElement.DoOwnPaint(IGraphics graphics, Single angle, SizeF scale)
   at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadItem.PaintOverride(IGraphics screenRadGraphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.PaintChild(RadElement child, IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.VisualElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadItem.PaintOverride(IGraphics screenRadGraphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.PaintChild(RadElement child, IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.VisualElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadItem.PaintOverride(IGraphics screenRadGraphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadControl.OnPaint(PaintEventArgs e)
   at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer)
   at System.Windows.Forms.Control.WmPaint(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at Telerik.WinControls.RadControl.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

IMPORTANT: If both colors are changed at design time and you set the Value of RadLinearGauge to 0, this will provoke a similar error leading Visual Studio to crash.

Workaround: specify a minimum width/height for the gauge:

this.radLinearGauge1.MinimumSize = new Size(1, (int)this.linearGaugeBar1.Offset+1);

 

 

To reproduce:
- Place a gauge on the form.
- Add panel over it.
- The gauge elements can be selected (see attached). 

The attached video shows how this can be reproduced.

Workaround:
class MyLabel : RadialGaugeSingleLabel
{
    private RadRadialGaugeElement owner;
    protected override void OnParentChanged(RadElement previousParent)
    {
        base.OnParentChanged(previousParent);
        this.owner = (RadRadialGaugeElement) this.Parent;
    }
    public override GraphicsPath Path
    {
        get
        {
            GraphicsPath path = new GraphicsPath();
            float fontSizePercentage = this.Font.Size;
            var gaugeSize = (RectangleF)this.owner.GetType().GetProperty("GaugeSize", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(this.owner, null)  ;

            if (this.AutoSize)
            {
                fontSizePercentage = (gaugeSize.Width) * (this.LabelFontSize / 100f);
                if (fontSizePercentage <0)
                {
                    return path;

                }
            }
            return base.Path;
        }
    }
}

How to reproduce:
Open the attached project, change the name of the RadLinearGauge located on the first page. Save and Run the project. The gauges on the other pages will change their orientation to horizontal

Workaround:
Prior to rebuilding or running the application select in the VS designer each of the pages of RadPageView

To reproduce:
- Add RadLienarGauge to a scrollable panel.
- Start the application and scroll.
- You will notice that some elements are not painted correctly.

Workaround:
- Override the IsInVisibleClipBounds in each used element:

public class MyTicks : Telerik.WinControls.UI.Gauges.LinearGaugeTicks
{
    protected override bool IsInVisibleClipBounds(Rectangle clipRectangle)
    {
        return true;
    }
}

LinearGaugeNeedleIndicator.cs >> LineLenght property, LenghtPercentage property

To reproduce:
- Make sure there are atlest tow design asemblies in your GAC
- Create a new version and drop a gauge on the form.
- Visual Studio needs to be restarted.

The attched video shows how you can reproduce this. 

Workaround: create a custom LinearGaugeLabels. Check the attached project for implementation.

The designer is retrieving the assemblies names using the FullName property and when the name cointas some charters an exception is thrown.
This is why the gallery is not loaded in the designer.