topic Re: Colorramp in arcgis wpf ??? in ArcGIS API for Silverlight Questions

Colorramp in arcgis wpf ???

ThaoNguyen — Fri, 18 Feb 2011 16:39:17 GMT

I have a properties dialog that let user select a theme color and based on the theme that I generate colors which will be applied to different regions of a map.

Before, we use arcgis 9.3 api, there are ESRI.ArcGIS.Display.IEnumColors class that can generate colors for us. Now, we are using arcgis wpf apis only, is there a similar class that achieve the same work?

Code example of what we did:

IColorRamp colorRamp = ColorRampInstance;
colorRamp.Size = 5
bool ok = true;
colorRamp.CreateRamp(out ok);

IEnumColors enumRamp = colorRamp.Colors;
IColor nextUniqueColor = enumRamp.Next();

How can we achieve the same thing using arcgis wpf apis?

Thanks!

Re: Colorramp in arcgis wpf ???

JenniferNery — Fri, 18 Feb 2011 17:36:01 GMT

Do you mean interpolate color of graphic symbols in your map?

If yes you can refer to these samples:
http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#TemporalRendererPoints
http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#TemporalRendererTracks

Note TemporalRenderer.SymbolAger in above samples use RampInterpolator by Opacity, this can also been done by Color. http://help.arcgis.com/en/webapi/silverlight/apiref/ESRI.ArcGIS.Client~ESRI.ArcGIS.Client.RampInterpolator.html

Re: Colorramp in arcgis wpf ???

ThaoNguyen — Fri, 18 Feb 2011 17:47:57 GMT

Do you mean interpolate color of graphic symbols in your map?

If yes you can refer to these samples:
http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#TemporalRendererPoints
http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#TemporalRendererTracks

Note TemporalRenderer.SymbolAger in above samples use RampInterpolator by Opacity, this can also been done by Color. http://help.arcgis.com/en/webapi/silverlight/apiref/ESRI.ArcGIS.Client~ESRI.ArcGIS.Client.RampInterpolator.html

Thanks for the quick response. I think it is color interpolate but samples you gave are not quite what I'm looking for.

Each of my theme has 3 basic colors. I pass these colors to IColorRamp. If my map has 10 regions, I want to have 10 colors generated based on my theme applied to the regions. IColorRamp does this for me, it will generate the colors for me. Then, I apply these colors to my map (I know how to do this part). I wonder if arcgis wpf provides me some color "generator" like IColorRamp or not.

Re: Colorramp in arcgis wpf ???

ThaoNguyen — Fri, 18 Feb 2011 17:54:12 GMT

Attached is a map with different colors applied to different regions. These colors are generated by IColorRamp based on the theme colors I pass in. Hope this helps.

Re: Colorramp in arcgis wpf ???

JenniferNery — Fri, 18 Feb 2011 18:30:44 GMT

Ah I see. You can refer to this SDK sample: http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#Thematic_Interactive.

This other sample use ClassBreaksRenderer: http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#FeatureLayerRendering

Re: Colorramp in arcgis wpf ???

ThaoNguyen — Fri, 18 Feb 2011 18:56:05 GMT

Ah I see. You can refer to this SDK sample: http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#Thematic_Interactive.

This other sample use ClassBreaksRenderer: http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#FeatureLayerRendering

The first example is not quite what I'm looking for either because it uses only 1 basic color while I have 3.
I just want to know if arcgis wpf provides a quick way like arcgis desktop api does.
Thanks for your effort!