Polygon manipulation in its nodes

[Tom Rink]

Hi Andrea,

One possibility:  use separate DirectManipulationRenderers
for each node and redraw the connecting lines as the nodes
are changed.

Tom

Andrea Antonello wrote:

>I gave a closer look into the CurveManipulationRenderer class and the
>regarding classes.
>As I understand it, the rendering is passed to the ShadowCurveSetTypeJ3D
>and then to the ShadowFunctionOrSetType.
>
>Using that approach I am able to modify the shapefile on the display,
>the problem is that it is modified not only in its nodes, but also in
>every point between two nodes, which it should not. I saw the same
>behaviour in the IDV. Even if the nodes are visualized with boxes, it is
>possible to modify also points between the node boxes.
>
>How I would like to have it behave is kinda similar as in the example of the
>bom.TrackManipulation. 
>
>Now I need some help to get the right starting point.
>I would like to do the following:
>- have the nodes (coordinates) of the shapefile surrounded by a small
>shape of any kind
>- have the manipulation renderer to modify only the nodes through the
>dragging action, adapting the two lines that converge into the node so
>that they stay straight lines and follow their node.
>
>What exactly should I do? Extend the ShadowFunctionOrSetType and
>override the doTranform method inserting the drawing of the shapes?
>
>I really need some good advice.
>
>Thanks,
>Andrea
>
>
>
>
>
>
>* [A.D. 27/11/06 17:25], Andrea Antonello <andrea.antonello at gmail.com> probably wrote:
>  
>
>>Hi Tom,
>>you are right, it is a problem of Type.
>>
>>I went a bit into the code and noticed that the method
>>setIsDirectManipulation(boolean) of the DataRenderer is set to false
>>(and throws the error I reported in the original post), if
>>the type of the data is not of one of the following types:
>>FunctionType, RealTupleType, RealType
>>which the Gridded2DSet is not.
>>
>>I will have a closer look to the CurveManipulationRenderer class. I
>>already gave it a very quick look for it is a nice example of drawing.
>>Hopefully you are right, I could have a chance to modify it for my needs.
>>
>>Thanks man,
>>Andrea
>>
>>
>>
>>* [A.D. 27/11/06 10:10], Tom Rink <rink at ssec.wisc.edu> probably wrote:
>>    
>>
>>>Hi Andrea,
>>>
>>>The default DirectManipulationRenderer makes certain
>>>assumptions about the structure of the linked data in
>>>order to generate new data values as a result of user
>>>gestures.   A polygon is too ambiguous for the default
>>>logic and probably a "notSimpleField" or "notRealFunction"
>>>exception is being thrown.  You could try using the
>>>CurveManipulationRenderer class in the visad.bom
>>>package.  I believe the folks at Unidata have done some
>>>work with this in the IDV.
>>>
>>>Tom
>>>
>>>Andrea Antonello wrote:
>>>
>>>      
>>>
>>>>I am trying to create a toolbox that is able to modify shapefiles.
>>>>My first approach is the existing DirectManipulationRendererJ3D, but as
>>>>I try it with the code below, it gives me:
>>>>
>>>>null: DirectManipulationRendererJ3D.doTransform in the lower left corner
>>>>of the display.
>>>>
>>>>_________________________________________________________
>>>>          Coordinate[] tmpCoord = coords.elementAt(i);
>>>>          int np = tmpCoord.length;
>>>>          float[][] samples = new float[2][np];
>>>>          for (int j = 0; j < np; j++) {
>>>>              samples[0][j] = (float) tmpCoord[j].x;
>>>>              samples[1][j] = (float) tmpCoord[j].y;
>>>>          }
>>>>
>>>>          // the lines
>>>>          Gridded2DSet tmpLines = new Gridded2DSet(earth, samples,
>>>>                  samples[0].length);
>>>>          // create a DataReference for river system
>>>>          DataReference rivers_ref = new DataReferenceImpl("rivers");
>>>>          rivers_ref.setData(tmpLines);
>>>>
>>>>          ConstantMap[] colorMapLines = { new ConstantMap(1, Display.Red),
>>>>                  new ConstantMap(0, Display.Green),
>>>>                  new ConstantMap(0, Display.Blue),
>>>>                  new ConstantMap(3f, Display.LineWidth) };
>>>>          display1.addReferences(new DirectManipulationRendererJ3D(),
>>>>                  rivers_ref, colorMapLines);
>>>>_________________________________________________________
>>>>
>>>>What am I doing wrong?
>>>>
>>>>Regards,
>>>>Andrea
>>>>        
>>>>
>
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