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SearchTolerance in ArcGIS Pro

KrisCulin

Hi,

In ArcObjects, there is a SearchTolerance property on IMxDocument.

Is there an equivalent to this in the ArcGIS Pro SDK? If so, where can I retrieve the value?

If not, what can I do to mimic what SearchTolerance does in ArcMap? We use it with the Envelope.Expand method when detecting if a click point is near any existing features.

In ArcMap, SearchTolerance changes depending on the zoom. The farther you zoom out, the larger the tolerance is and vice-versa.

TIA.

Kris

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UmaHarano

In Pro, you can use the SelectionEnvironment class.

SelectionTolerance

SetSelectionTolerance

Thanks!

Uma

KrisCulin

Thanks Uma.

Followup - the value is 3 and appears to be in Device Units which I assume is pixels. How can I convert this value to the map linear unit so I can pass it into Envelope.Expand? Is there an easy way to do this? ArcObjects did this automatically with the SearchTolerance property (SearchTolerancePixels was the value in pixels).

TIA.

Kris

Anonymous User

In the past ive calculated the pixel linear distance from a known point in the map, either the mouse location or the center of the map as a MapPoint.

    <SPAN class="keyword token">private</SPAN> Polygon <SPAN class="token function">CreateSearchPolygon</SPAN><SPAN class="punctuation token">(</SPAN>MapPoint mapPoint<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">int</SPAN> pixels<SPAN class="punctuation token">)</SPAN>
    <SPAN class="punctuation token">{</SPAN>
      <SPAN class="comment token">//get search radius</SPAN>
      <SPAN class="keyword token">var</SPAN> screenPoint <SPAN class="operator token">=</SPAN> MapView<SPAN class="punctuation token">.</SPAN>Active<SPAN class="punctuation token">.</SPAN><SPAN class="token function">MapToScreen</SPAN><SPAN class="punctuation token">(</SPAN>mapPoint<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
      <SPAN class="keyword token">var</SPAN> radiusScreenPoint <SPAN class="operator token">=</SPAN> <SPAN class="keyword token">new</SPAN> <SPAN class="token class-name">System<SPAN class="punctuation token">.</SPAN>Windows<SPAN class="punctuation token">.</SPAN>Point</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">(</SPAN>screenPoint<SPAN class="punctuation token">.</SPAN>X <SPAN class="operator token">+</SPAN> pixels<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> screenPoint<SPAN class="punctuation token">.</SPAN>Y<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
      <SPAN class="keyword token">var</SPAN> radiusMapPoint <SPAN class="operator token">=</SPAN> MapView<SPAN class="punctuation token">.</SPAN>Active<SPAN class="punctuation token">.</SPAN><SPAN class="token function">ScreenToMap</SPAN><SPAN class="punctuation token">(</SPAN>radiusScreenPoint<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
      <SPAN class="keyword token">var</SPAN> searchRadius <SPAN class="operator token">=</SPAN> GeometryEngine<SPAN class="punctuation token">.</SPAN>Instance<SPAN class="punctuation token">.</SPAN><SPAN class="token function">Distance</SPAN><SPAN class="punctuation token">(</SPAN>mapPoint<SPAN class="punctuation token">,</SPAN> radiusMapPoint<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

In the example above i was creating a search polygon around a mappoint by pixels.

The variable searchRadius is your linear distance.

KrisCulin

Than you Sean. This is exactly what I need.

Much appreciated.

Kris

RobertGurrieri

Hi Uma,

Is SelectionTolerance used by ArcGIS Pro itself (e.g. is it used by the native select tool)? If so, can the tolerance setting be controlled by the user (is there an option in the UI somewhere)?

Thanks,

Rob.

UmaHarano

Hi Robert,

I don't see an UI setting for Search Tolerance either.

Uma

RobertGurrieri

Thank you Uma.

Rob.

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