Circular Gauge binding problems

[Derrick Willer]

It doesn't seem like binding to StartValue / EndValue for both Scales and multiple Ranges really works.  I dont see them having any effect.  I have a scenario where the bounds of the gauge need to change dynamically - basically the viewmodel tracks the min and max values seen and I want the extents of the gauge to track these, so that the needle is always in the middle.  If I bind to StartValue / EndValue nothing happens when I change the properties in my viewmodel.

I have other properties bound (StartValue / EndValue on a single range when the scale has fixed start/end seems to work) so it isn't a vm problem.

If I hook my view up to the propertychanged event of my viewmodel directly, I'm able to set startvalue/endvalue on the scale and 2nd range just fine, but this is ugly and not MVVM.  I saw a prior thread from 2013 relating to the winrt controls, so maybe there's something similar going on here.

Here is my creation code

    _radialGauge =

                new SfCircularGauge

                {

                    GaugeType = GaugeType.North

                };

            _scale =

                new Scale

                {

                    StartValue = 0,

                    StartAngle = 200,

                    SweepAngle = 140,

                    EndValue = 20, //DefaultAutoMax, //20,

                    ShowRim = false,

                    MajorTickSettings =

                        new TickSettings

                        {

                            Color = Color.FromRgba(128, 128, 128, 128),

                            Length = 200,

                            Offset = 0.08

                        },

                    MinorTicksPerInterval = 1,

                    MinorTickSettings =

                        new TickSettings

                        {

                            Color = Color.FromRgba(200, 200, 200, 128),

                            Length = 200,

                            Offset = 0.08,

                        },

                    Interval = 1.0,

                    //NumberOfDecimalDigits = 3,

                    LabelColor = CurrentTheme.ColorScheme.Gray50,

                    LabelOffset = 0,

                    LabelFontSize = 20,  //known issue - this has no effect until next update

                };

            //_scale.SetBinding(Syncfusion.SfGauge.XForms.Scale.StartValueProperty, "RangeStart");

            //_scale.SetBinding(Syncfusion.SfGauge.XForms.Scale.EndValueProperty, "RangeEnd");

            //_scale.SetBinding(Syncfusion.SfGauge.XForms.Scale.IntervalProperty, "RangeInterval");

            var pointer =

                new NeedlePointer

                {

                    Color = Color.FromRgb(228, 56, 130),

                    KnobColor = this.BackgroundColor,

                    KnobRadius = 400,

                    LengthFactor = 0.98,

                    EnableAnimation = false

                };

            pointer.SetBinding(NeedlePointer.ValueProperty, "Current");

            _scale.Pointers.Add(pointer);

            

            _backRange =

                new Range

                {

                    Color = Color.FromRgb(239, 227, 211),

                    Thickness = 220,

                    Offset = 0.05,

                    StartValue = 0,// scale.StartValue,

                    EndValue = _scale.EndValue//DefaultAutoMax,// scale.EndValue

                };

            //_backRange.SetBinding(Range.StartValueProperty, "RangeStart");

            //_backRange.SetBinding(Range.EndValueProperty, "RangeEnd");

            _scale.Ranges.Add(_backRange);

            var range =

                new Range

                {

                    Color = Color.FromRgb(178, 216, 239),

                    Thickness = 220,

                    Offset = 0.05

                };

            range.SetBinding(Range.StartValueProperty, "Minimum");

            range.SetBinding(Range.EndValueProperty, "Maximum");

            _scale.Ranges.Add(range);

            _radialGauge.Scales.Add(_scale);

[Derrick Willer]

LinearRange bindings for StartValue / EndValue in a LinearGauge don't appear to work either.

Even if I manually bind to property changing and try to directly update the values, the displayed range is never changed.

[Nijamudeen Mohamed Sulaiman]

Hi Derrick,

Thanks for your interest in Syncfusion products.

We have created a separate incidents for this query, please login to below location to have follow up regarding this query.

Link: https://www.syncfusion.com/account/login?ReturnUrl=%2fsupport%2fdirecttrac%2fincidents

Please let us know if you have any concern.

Regards,

Nijamudeen M.