(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
*************************************************************
