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Curve Issue

User (Legacy)

By User (Legacy)
in Windows Forms

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User (Legacy) Newbie

User (Legacy)

Posted
Posted 

Using the ChartFx for .NET 6.2 Trial with Winforms; i'm trying to create a 

pump efficiency chart (parabolic fit)

All I did is:

Added a ChartFx Component to a new WinForm and added the following code in a 

Button_Click event to create a sample chart.

  private void button1_Click(object sender, System.EventArgs e)

  {

   chart1.Gallery = SoftwareFX.ChartFX.Gallery.Curve;

   chart1.MarkerShape = SoftwareFX.ChartFX.MarkerShape.Many;

   chart1.AxisY.Max = 110;

   chart1.PointLabels = false;

   chart1.Grid = SoftwareFX.ChartFX.ChartGrid.Vert | 

SoftwareFX.ChartFX.ChartGrid.Horz ;

   chart1.OpenData(SoftwareFX.ChartFX.COD.XValues, 1, 6);

    chart1.XValue[0, 0] = 0;

    chart1.XValue[0, 1] = 478;

    chart1.XValue[0, 2] = 500;

    chart1.XValue[0, 3] = 525;

    chart1.XValue[0, 4] = 543;

    chart1.XValue[0, 5] = 568;

   chart1.CloseData(SoftwareFX.ChartFX.COD.XValues);

   chart1.OpenData(SoftwareFX.ChartFX.COD.Values, 1, 6);

    chart1.Value[0, 0] = 0;

    chart1.Value[0, 1] = 66.0484330484331;

    chart1.Value[0, 2] = 67.2140291847132;

    chart1.Value[0, 3] = 67.5709996754301;

    chart1.Value[0, 4] = 68.5768542534071;

    chart1.Value[0, 5] = 68.5683547848685;

   chart1.CloseData(SoftwareFX.ChartFX.COD.Values);

  }

The attached JPG shows the chart created.  I've edited the image to 

highlight the problem area.  It spikes between 2nd & 3rd points instead of 

smoothing out.

I kindof understand why it is doing that - while there is a huge difference 

between XValue[0] & XValue[1] there is very minimal difference between 

XValue[1] to XValue[2] and also Value[1] & Value[2].  The component seems to 

have difficulty interpolating the smooth fit that we can get by drawing the 

curve manually.

Is there a way to get this to work correctly?

Any input is highly appreciated.

Thanks
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Software FX Newbie

Software FX

Posted
Posted 

This is a bug in the .NET curve algorithm, we have a sample (attached) that 

shows a curve drawn using .NET, this sample does not use ChartFX , resizing 

the window will exhibit the same behavior.

The only workaround would be to use a different algorithm we implemented in 

our curve gallery. Note that because of the way we implemented this, you 

will not get antialiasing.

chart1.Gallery = Gallery.Curve;

SoftwareFX.ChartFX.GalleryObj.Curve curve = 

(SoftwareFX.ChartFX.GalleryObj.Curve) chart1.GalleryObj;

curve.Native = false;

-- 

JC

Software FX Support

"AnandCbe14" <anandcbe14@hotmail.com> wrote in message 

news:uX1%23KRfBGHA.280@webserver3.softwarefx.com...

> Using the ChartFx for .NET 6.2 Trial with Winforms; i'm trying to create a

> pump efficiency chart (parabolic fit)

> All I did is:

> Added a ChartFx Component to a new WinForm and added the following code in 

> a

> Button_Click event to create a sample chart.

>

>  private void button1_Click(object sender, System.EventArgs e)

>  {

>   chart1.Gallery = SoftwareFX.ChartFX.Gallery.Curve;

>   chart1.MarkerShape = SoftwareFX.ChartFX.MarkerShape.Many;

>   chart1.AxisY.Max = 110;

>   chart1.PointLabels = false;

>   chart1.Grid = SoftwareFX.ChartFX.ChartGrid.Vert |

> SoftwareFX.ChartFX.ChartGrid.Horz ;

>   chart1.OpenData(SoftwareFX.ChartFX.COD.XValues, 1, 6);

>    chart1.XValue[0, 0] = 0;

>    chart1.XValue[0, 1] = 478;

>    chart1.XValue[0, 2] = 500;

>    chart1.XValue[0, 3] = 525;

>    chart1.XValue[0, 4] = 543;

>    chart1.XValue[0, 5] = 568;

>   chart1.CloseData(SoftwareFX.ChartFX.COD.XValues);

>   chart1.OpenData(SoftwareFX.ChartFX.COD.Values, 1, 6);

>    chart1.Value[0, 0] = 0;

>    chart1.Value[0, 1] = 66.0484330484331;

>    chart1.Value[0, 2] = 67.2140291847132;

>    chart1.Value[0, 3] = 67.5709996754301;

>    chart1.Value[0, 4] = 68.5768542534071;

>    chart1.Value[0, 5] = 68.5683547848685;

>   chart1.CloseData(SoftwareFX.ChartFX.COD.Values);

>

>  }

>

> The attached JPG shows the chart created.  I've edited the image to

> highlight the problem area.  It spikes between 2nd & 3rd points instead of

> smoothing out.

> I kindof understand why it is doing that - while there is a huge 

> difference

> between XValue[0] & XValue[1] there is very minimal difference between

> XValue[1] to XValue[2] and also Value[1] & Value[2].  The component seems 

> to

> have difficulty interpolating the smooth fit that we can get by drawing 

> the

> curve manually.

>

> Is there a way to get this to work correctly?

> Any input is highly appreciated.

>

> Thanks

>

>

>

post-2107-13922380923718_thumb.jpg

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  • 2 weeks later...
User (Legacy) Newbie

User (Legacy)

Posted
  • Author
Posted 

Excellent clarification

At the moment, I'll take a good curve fit instead of antialiasing

Thanks a lot for the alternate solution.

"Software FX Support" <none@noreply.com> wrote in message 

news:P1B$idnBGHA.564@webserver3.softwarefx.com...

> This is a bug in the .NET curve algorithm, we have a sample (attached) 

> that shows a curve drawn using .NET, this sample does not use ChartFX , 

> resizing the window will exhibit the same behavior.

>

> The only workaround would be to use a different algorithm we implemented 

> in our curve gallery. Note that because of the way we implemented this, 

> you will not get antialiasing.

>

> chart1.Gallery = Gallery.Curve;

> SoftwareFX.ChartFX.GalleryObj.Curve curve = 

> (SoftwareFX.ChartFX.GalleryObj.Curve) chart1.GalleryObj;

> curve.Native = false;

>

> -- 

> JC

> Software FX Support

> "AnandCbe14" <anandcbe14@hotmail.com> wrote in message 

> news:uX1%23KRfBGHA.280@webserver3.softwarefx.com...

>> Using the ChartFx for .NET 6.2 Trial with Winforms; i'm trying to create 

>> a

>> pump efficiency chart (parabolic fit)

>> All I did is:

>> Added a ChartFx Component to a new WinForm and added the following code 

>> in a

>> Button_Click event to create a sample chart.

>>

>>  private void button1_Click(object sender, System.EventArgs e)

>>  {

>>   chart1.Gallery = SoftwareFX.ChartFX.Gallery.Curve;

>>   chart1.MarkerShape = SoftwareFX.ChartFX.MarkerShape.Many;

>>   chart1.AxisY.Max = 110;

>>   chart1.PointLabels = false;

>>   chart1.Grid = SoftwareFX.ChartFX.ChartGrid.Vert |

>> SoftwareFX.ChartFX.ChartGrid.Horz ;

>>   chart1.OpenData(SoftwareFX.ChartFX.COD.XValues, 1, 6);

>>    chart1.XValue[0, 0] = 0;

>>    chart1.XValue[0, 1] = 478;

>>    chart1.XValue[0, 2] = 500;

>>    chart1.XValue[0, 3] = 525;

>>    chart1.XValue[0, 4] = 543;

>>    chart1.XValue[0, 5] = 568;

>>   chart1.CloseData(SoftwareFX.ChartFX.COD.XValues);

>>   chart1.OpenData(SoftwareFX.ChartFX.COD.Values, 1, 6);

>>    chart1.Value[0, 0] = 0;

>>    chart1.Value[0, 1] = 66.0484330484331;

>>    chart1.Value[0, 2] = 67.2140291847132;

>>    chart1.Value[0, 3] = 67.5709996754301;

>>    chart1.Value[0, 4] = 68.5768542534071;

>>    chart1.Value[0, 5] = 68.5683547848685;

>>   chart1.CloseData(SoftwareFX.ChartFX.COD.Values);

>>

>>  }

>>

>> The attached JPG shows the chart created.  I've edited the image to

>> highlight the problem area.  It spikes between 2nd & 3rd points instead 

>> of

>> smoothing out.

>> I kindof understand why it is doing that - while there is a huge 

>> difference

>> between XValue[0] & XValue[1] there is very minimal difference between

>> XValue[1] to XValue[2] and also Value[1] & Value[2].  The component seems 

>> to

>> have difficulty interpolating the smooth fit that we can get by drawing 

>> the

>> curve manually.

>>

>> Is there a way to get this to work correctly?

>> Any input is highly appreciated.

>>

>> Thanks

>>

>>

>>

>

>

>
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