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20040727: IDV - Linux - ShapeUtility.java

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  • Subject: 20040727: IDV - Linux - ShapeUtility.java
  • Date: Tue, 27 Jul 2004 13:26:07 -0600
>From: "Stuart Wier" <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200407271724.i6RHObNx009806

Stu-

>Institution: UNAVCO
>Package Version: 1.1b3
>Operating System: Linux
>Hardware Information:  Intel 586
>Inquiry: In 
>ucar/visad/ShapeUtility.java
>the following code is used to make \"shapes\" 
>(VisADGeometryArray-s) to mark observation locations.  Can you say what is the
>  principle behind this code so I can make other shapes? In particular we need
>  a sphere or similar 3D shape.


The shapes are based on the default VisAD box coordinates from
-1.0 to 1.0 in all directions.  In the IDV, the shapes are then
scaled to an appropriate size using the ShapeUtility.setSize()
method (see SelectorPoint.java or StationModelDisplayable.java
for examples).

The values for the coordinates are xyz triplets of the vertices.
The VisADGeometryArray you use will depend on what you are trying
to draw.  For a sphere, you would have to figure out how many
vertices you want.  You might send a note to the VisAD list to
see if someone has already created some shapes.  That's how
I got most of the ones we have.

Good luck,

Don

>Thanks,
>
>Stu Wier
>
>        } else if (s.equals(CUBE)) {
>            shape             = new VisADQuadArray();
>            shape.coordinates = new float[] {
>                1.0f, 1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, -1.0f, -1.0f,
>                -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, 1.0f, -1.0f,
>                -1.0f, 1.0f, -1.0f, 1.0f, 1.0f, -1.0f, 1.0f, 1.0f, 1.0f, 1.0f,
>                -1.0f, 1.0f, 1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, -1.0f,
>                -1.0f, 1.0f, -1.0f, 1.0f, 1.0f, -1.0f, 1.0f, 1.0f, 1.0f, 1.0f,
>                1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, -1.0f, 1.0f, 1.0f, -1.0f,
>                1.0f, -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, -1.0f, 1.0f,
>                1.0f, -1.0f, 1.0f, 1.0f, 1.0f, 1.0f, -1.0f, 1.0f, 1.0f, -1.0f,
>                1.0f, -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f,
>                -1.0f, -1.0f, -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, -1.0f,
>                1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, -1.0f, 1.0f, 1.0f,
>                -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f,
>                1.0f, -1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, -1.0f, 1.0f,
>                1.0f, -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, -1.0f, -1.0f, -1.0f,
>                -1.0f, -1.0f, -1.0f, -1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f,
>                1.0f, -1.0f, 1.0f
>            };
>
>            shape.normals = new float[144];
>            for (int i = 0; i < 24; i += 3) {
>                shape.normals[i]       = 0.0f;
>                shape.normals[i + 1]   = 0.0f;
>                shape.normals[i + 2]   = -1.0f;
>
>                shape.normals[i + 24]  = 0.0f;
>                shape.normals[i + 25]  = 0.0f;
>                shape.normals[i + 26]  = 1.0f;
>
>                shape.normals[i + 48]  = 1.0f;
>                shape.normals[i + 49]  = 0.0f;
>                shape.normals[i + 50]  = 0.0f;
>
>                shape.normals[i + 72]  = -1.0f;
>                shape.normals[i + 73]  = 0.0f;
>                shape.normals[i + 74]  = 0.0f;
>
>                shape.normals[i + 96]  = 0.0f;
>                shape.normals[i + 97]  = 1.0f;
>                shape.normals[i + 98]  = 0.0f;
>
>                shape.normals[i + 120] = 0.0f;
>                shape.normals[i + 121] = -1.0f;
>                shape.normals[i + 122] = 0.0f;
>            }
>
>
>        } else if (s.equals(TRIANGLE)) {
>            shape             = new VisADLineArray();
>            shape.coordinates = new float[] {
>                -1.0f, -0.5f, 0.0f, 1.0f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f
>            };
>        } else if (s.equals(FILLED_TRIANGLE)) {
>            shape             = new VisADTriangleArray();
>            shape.coordinates = new float[] {
>                -1.0f, -0.5f, 0.0f, 1.0f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f
>            };
>
>        } else if (s.equals(AIRPLANE)) {
>            shape             = new VisADTriangleArray();
>            shape.coordinates = new float[] {
>                0.0f, -1.0f, 0.0f, 0.1f, 0.8f, 0.0f, -0.1f, 0.8f, 0.0f, 0.0f,
>                -0.9f, 0.0f, 0.1f, 0.8f, 0.0f, -0.1f, 0.8f, 0.0f, -0.025f,
>                -0.9f, 0.0f, 0.025f, -0.9f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
>                0.35f, 0.0f, 0.0f, 0.05f, 0.0f, 0.8f, 0.0f, 0.0f, 0.0f, 0.35f,
>                0.0f, 0.0f, .05f, 0.0f, -0.8f, 0.0f, 0.0f, 0.0f, -0.75f, 0.0f,
>                0.0f, -0.85f, 0.0f, .25f, -0.85f, 0.0f, 0.0f, -0.75f, 0.0f,
>                0.0f, -0.85f, 0.0f, -0.25f, -0.85f, 0.0f
>            };
>        }
>
>
>
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