[GIS] How to change Map Scale programmaticaly in C# WinForm Project

arcobjectsc

I have created form with axMapControl and comboBox with values of possible scales (e.g. 1:1 000 000, 1: 500 000, etc).

How can I change current map scale programmaticaly by using value from selectedItem taken from Combobox?

Best Answer

You can set IMap.MapScale to set the current map scale.

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I don't think you can use SimpleRendererClass because it is designed to use the same symbol for all features. You might want to take a look at ClassBreaksRendererClass.

SDK page for ClassBreaksRenderer

It also has "see also" links to other types of renderers that may be appropriate.

[GIS] MapScale not being persisted properly in mxd when programmatically changed outside of ArcMap environment

Solved - and it took Redlands to come back with a slightly unusual fix, it utilises the InteropServices library - hopefully it will be fixed properly in a future release or patch by ESRI.

[DllImport("User32.dll")]
public static extern int GetDesktopWindow(); 

private IMapDocument mapDocument = null;

private void ChangeMapScale()
{
    mapDocument.Open(@"C:\Temp\foo.mxd", null);

    IPageLayout pageLayout = mapDocument.PageLayout;
    IActiveView activeView = (IActiveView)pageLayout;
    IMap map = activeView.FocusMap;

    activeView = (IActiveView)mapDocument.PageLayout;
    activeView.Activate(GetDesktopWindow());

    map.MapScale = value;
    activeView.Refresh();

    mapDocument.Save(true, true);
}

Best Answer

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[GIS] Symbolizing layer with graduated colors using ArcObjects

[GIS] MapScale not being persisted properly in mxd when programmatically changed outside of ArcMap environment

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