How to draw polygons

Use this subroutine to draw a Polygon on the screen. With this example, the polygon will not persist on the screen; it will disappear when the screen next refreshes. See the Buffer Polygons sample for an example showing how drawings can be persisted on the display.

How to use

  1. Stub out the code to implement a tool.
  2. Paste the code below into its OnMouseDown event.
  3. Add the tool to an ArcMap toolbar, select it, and click somewhere on the focus map.
[VCPP] 
STDMETHODIMP CToolControl1::OnMouseDown(LONG button, LONG shift, LONG x, LONG y)
{
  IDocumentPtr ipDoc;
  m_ipApp->get_Document(&ipDoc);
  IMxDocumentPtr ipMxDoc(ipDoc);
  IMapPtr ipMap;
  ipMxDoc->get_FocusMap(&ipMap);
  IActiveViewPtr ipActiveView(ipMap);
  IScreenDisplayPtr ipScreenDisplay;
  ipActiveView->get_ScreenDisplay(&ipScreenDisplay);
  IRubberBandPtr ipRubberPolygon(CLSID_RubberPolygon);

  IRgbColorPtr ipRgbColor(CLSID_RgbColor);
  ipRgbColor->put_Red(255);
  ISimpleFillSymbolPtr ipFillSymbol(CLSID_SimpleFillSymbol);
  ipFillSymbol->put_Color(ipRgbColor);

  ISymbolPtr ipSym(ipFillSymbol);
  IGeometryPtr ipGeometry;
  ipRubberPolygon->TrackNew(ipScreenDisplay, ipSym, &ipGeometry);

  OLE_HANDLE hDC;
  ipScreenDisplay->get_hDC(&hDC);
  ipScreenDisplay->StartDrawing(hDC, esriNoScreenCache);
  ipScreenDisplay->SetSymbol(ipSym);
  ipScreenDisplay->DrawPolygon(ipGeometry);
  ipScreenDisplay->FinishDrawing();

  return S_OK;
}





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