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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
(forgot to cc the list and thank Tom W and Doug L for their
contributions to the code below)
One more thing:
m huang wrote:
> Hi
>
> Sorry to pile on so many questions. I appreciate people,
> particularly Bill, to take time to answer. I will reply
> the answers after finish this round.
> 2) Is there an *existing* set of shapes for the user to use
> as data points in the plot? I see there is support for creating
> any shapes and there is an example as how to do this for those
> who want to make a shape from scratch. I have tinkered with
> the tutorial example P2_06 and tried to map the example realTypes
> into Display.Shape, but I don't see anything showing up.
Here's the method I use to create some standard shapes. All
shapes are drawn in a 1x1 box, so you have to scale them to
make the size you want. I've attached the method we use for
that also:
public static final String PLUS = "PLUS";
public static final String CROSS = "CROSS";
public static final String SQUARE = "SQUARE";
public static final String FILLED_SQUARE = "FILLED_SQUARE";
public static final String CUBE = "CUBE";
public static final String TRIANGLE = "TRIANGLE";
public static final String FILLED_TRIANGLE = "FILLED_TRIANGLE";
/**
* Create a predefined shape. Shapes are drawn on a 1x1(x1) box.
* Use <code>setSize()</code> methods to rescale.
* @param s shape to create
* @return corresponding shape
*/
public static VisADGeometryArray makeShape(String s) {
VisADGeometryArray shape = null;
if (s.equals(PLUS)) {
shape = new VisADLineArray();
shape.coordinates
new float[] {-1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
0.0f,-1.0f, 0.0f, 0.0f, 1.0f, 0.0f};
} else if (s.equals(CROSS)) {
shape = new VisADLineArray();
shape.coordinates
new float[] { 1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f,
0.0f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
0.0f, 0.0f, 1.0f, 0.0f, 0.0f, -1.0f};
} else if (s.equals(SQUARE)) {
shape = new VisADLineArray();
shape.coordinates
new float[] { 1.0f, 1.0f, 0.0f, 1.0f, -1.0f, 0.0f,
1.0f, -1.0f, 0.0f, -1.0f, -1.0f, 0.0f,
-1.0f, -1.0f, 0.0f, -1.0f, 1.0f, 0.0f,
-1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0 };
} else if (s.equals(FILLED_SQUARE)) {
shape = new VisADQuadArray();
shape.coordinates = new float[]
{1.0f, 1.0f, 0.0f, 1.0f, -1.0f, 0.0f,
-1.0f, -1.0f, 0.0f, -1.0f, 1.0f, 0.0f};
shape.normals = new float[12];
for (int i=0; i<12; i+=3) {
shape.normals[i] = 0.0f;
shape.normals[i+1] = 0.0f;
shape.normals[i+2] = 1.0f;
}
} 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;
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 {
throw new IllegalArgumentException("unsupported shape " + s);
}
shape.vertexCount = shape.coordinates.length / 3;
return shape;
}
/**
* Set the size of the shapes. Scales the size by size.
* @param shapes shapes to resize
* @param size scaling factor
*/
public static VisADGeometryArray setSize(VisADGeometryArray shape,
float size) {
if (shape.coordinates != null) {
for (int i=0; i<shape.coordinates.length; i++) {
shape.coordinates[i] *= size;
}
}
return shape;
}
Don
*************************************************************
Don Murray UCAR Unidata Program
dmurray@xxxxxxxxxxxxxxxx P.O. Box 3000
(303) 497-8628 Boulder, CO 80307
http://www.unidata.ucar.edu/staff/donm
*************************************************************
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