/**
* Create a front from the curve
*
* @param curve the curve coordinates
* @param flip true to flip the pips
* @return The front as a FieldImpl
* @throws RemoteException On badness
* @throws VisADException On badness
*/
private FieldImpl curveToFront(float[][] curve, boolean flip)
throws VisADException, RemoteException {
if (flipTheFlip) {
flip = !flip;
}
// compute various scaling factors
int len = curve[0].length;
if (len < 2) {
return null;
}
float[] seg_length = new float[len - 1];
float curve_length = curveLength(curve, seg_length);
float delta = curve_length / (len - 1);
// curve[findex] where
// float findex = ibase + mul * repeat_shapes[shape][0][j]
float mul = rprofile_length * zoom / rsegment_length;
// curve_perp[][findex] * ratio * repeat_shapes[shape][1][j]
float ratio = delta * mul;
// compute unit perpendiculars to curve
float[][] curve_perp = new float[2][len];
for (int i = 0; i < len; i++) {
int im = i - 1;
int ip = i + 1;
if (im < 0) {
im = 0;
}
if (ip > len - 1) {
ip = len - 1;
}
float yp = curve[0][ip] - curve[0][im];
float xp = curve[1][ip] - curve[1][im];
xp = -xp;
float d = (float) Math.sqrt(xp * xp + yp * yp);
if (flip) {
d = -d;
}
xp = xp / d;
yp = yp / d;
curve_perp[0][i] = xp;
curve_perp[1][i] = yp;
}
// build Vector of FlatFields for each shape of each segment
Vector inner_field_vector = new Vector();
for (int segment = 0; true; segment++) {
// curve[findex] where
// float findex = ibase + mul * repeat_shapes[shape][0][j]
float segment_length = (segment == 0) ? fsegment_length : rsegment_length;
int profile_length = (segment == 0) ? fprofile_length : rprofile_length;
mul = profile_length * zoom / segment_length;
// curve_perp[][findex] * ratio * repeat_shapes[shape][1][j]
// float ratio = delta * mul;
// figure out if clipping is needed for this segment
// only happens for last segment
boolean clip = false;
float xclip = 0.0f;
// int ibase = segment * profile_length;
int ibase = (segment == 0) ? 0 : fprofile_length + (segment - 1) * rprofile_length;
int iend = ibase + profile_length;
if (ibase > len - 1) {
break;
}
if (iend > len - 1) {
clip = true;
iend = len - 1;
xclip = (iend - ibase) / mul;
}
// set up shapes for first or repeating segment
int nshapes = nrshapes;
float[][][] shapes = repeat_shapes;
int[][][] tris = repeat_tris;
float[] red = repeat_red;
float[] green = repeat_green;
float[] blue = repeat_blue;
if (segment == 0) {
nshapes = nfshapes;
shapes = first_shapes;
tris = first_tris;
red = first_red;
green = first_green;
blue = first_blue;
}
// iterate over shapes for segment
for (int shape = 0; shape < nshapes; shape++) {
float[][] samples = shapes[shape];
int[][] ts = tris[shape];
/*
// if needed, clip shape
if (clip) {
float[][][] outs = new float[1][][];
int[][][] outt = new int[1][][];
DelaunayCustom.clip(samples, ts, 1.0f, 0.0f, xclip, outs, outt);
samples = outs[0];
ts = outt[0];
}
*/
if ((samples == null) || (samples[0].length < 1)) {
break;
}
float[][] ss = mapShape(samples, len, ibase, mul, ratio, curve, curve_perp);
// **** get rid of previous calls to fill() ****
ts = DelaunayCustom.fill(ss);
// jeffmc: For now don't clip. This seems to fix the problem of too short a front
boolean DOCLIP = false;
if (clip && DOCLIP) {
float[][] clip_samples = {
{xclip, xclip, xclip - CLIP_DELTA},
{CLIP_DELTA, -CLIP_DELTA, 0.0f}
};
float[][] clip_ss = mapShape(clip_samples, len, ibase, mul, ratio, curve, curve_perp);
// now solve for:
// xc * clip_samples[0][0] + yc * clip_samples[1][0] = 1
// xc * clip_samples[0][1] + yc * clip_samples[1][1] = 1
// xc * clip_samples[0][2] + yc * clip_samples[1][2] < 1
float det =
(clip_samples[0][1] * clip_samples[1][0] - clip_samples[0][0] * clip_samples[1][1]);
float xc = (clip_samples[1][0] - clip_samples[1][1]) / det;
float yc = (clip_samples[0][1] - clip_samples[0][0]) / det;
float v = 1.0f;
if (xc * clip_samples[0][2] + yc * clip_samples[1][2] > v) {
xc = -xc;
yc = -yc;
v = -v;
}
float[][][] outs = new float[1][][];
int[][][] outt = new int[1][][];
DelaunayCustom.clip(ss, ts, xc, yc, v, outs, outt);
ss = outs[0];
ts = outt[0];
}
if (ss == null) {
break;
}
int n = ss[0].length;
// create color values for field
float[][] values = new float[3][n];
float r = red[shape];
float g = green[shape];
float b = blue[shape];
for (int i = 0; i < n; i++) {
values[0][i] = r;
values[1][i] = g;
values[2][i] = b;
}
// construct set and field
DelaunayCustom delaunay = new DelaunayCustom(ss, ts);
Irregular2DSet set = new Irregular2DSet(curve_type, ss, null, null, null, delaunay);
FlatField field = new FlatField(front_inner, set);
field.setSamples(values, false);
inner_field_vector.addElement(field);
// some crazy bug - see Gridded3DSet.makeNormals()
} // end for (int shape=0; shape<nshapes; shape++)
} // end for (int segment=0; true; segment++)
int nfields = inner_field_vector.size();
Integer1DSet iset = new Integer1DSet(front_index, nfields);
FieldImpl front = new FieldImpl(front_type, iset);
FlatField[] fields = new FlatField[nfields];
for (int i = 0; i < nfields; i++) {
fields[i] = (FlatField) inner_field_vector.elementAt(i);
}
front.setSamples(fields, false);
return front;
}
/**
* run 'java FlowTest middle_latitude' to test with (lat, lon) run 'java FlowTest middle_latitude
* x' to test with (lon, lat) adjust middle_latitude for south or north
*/
public static void main(String args[]) throws VisADException, RemoteException {
double mid_lat = -10.0;
if (args.length > 0) {
try {
mid_lat = Double.valueOf(args[0]).doubleValue();
} catch (NumberFormatException e) {
}
}
boolean swap = (args.length > 1);
RealType lat = RealType.Latitude;
RealType lon = RealType.Longitude;
RealType[] types;
if (swap) {
types = new RealType[] {lon, lat};
} else {
types = new RealType[] {lat, lon};
}
RealTupleType earth_location = new RealTupleType(types);
System.out.println("earth_location = " + earth_location + " mid_lat = " + mid_lat);
RealType flowx = RealType.getRealType("flowx", CommonUnit.meterPerSecond);
RealType flowy = RealType.getRealType("flowy", CommonUnit.meterPerSecond);
RealType red = RealType.getRealType("red");
RealType green = RealType.getRealType("green");
EarthVectorType flowxy = new EarthVectorType(flowx, flowy);
TupleType range = null;
range = new TupleType(new MathType[] {flowxy, red, green});
FunctionType flow_field = new FunctionType(earth_location, range);
DisplayImpl display = new DisplayImplJ3D("display1", new TwoDDisplayRendererJ3D());
ScalarMap xmap = new ScalarMap(lon, Display.XAxis);
display.addMap(xmap);
ScalarMap ymap = new ScalarMap(lat, Display.YAxis);
display.addMap(ymap);
ScalarMap flowx_map = new ScalarMap(flowx, Display.Flow1X);
display.addMap(flowx_map);
flowx_map.setRange(-10.0, 10.0);
ScalarMap flowy_map = new ScalarMap(flowy, Display.Flow1Y);
display.addMap(flowy_map);
flowy_map.setRange(-10.0, 10.0);
FlowControl flow_control = (FlowControl) flowy_map.getControl();
flow_control.setFlowScale(0.05f);
display.addMap(new ScalarMap(red, Display.Red));
display.addMap(new ScalarMap(green, Display.Green));
display.addMap(new ConstantMap(1.0, Display.Blue));
double lonlow = -10.0;
double lonhi = 10.0;
double latlow = mid_lat - 10.0;
double lathi = mid_lat + 10.0;
Linear2DSet set;
if (swap) {
set = new Linear2DSet(earth_location, lonlow, lonhi, N, latlow, lathi, N);
} else {
set = new Linear2DSet(earth_location, latlow, lathi, N, lonlow, lonhi, N);
}
double[][] values = new double[4][N * N];
int m = 0;
for (int i = 0; i < N; i++) {
for (int j = 0; j < N; j++) {
int k = i;
int l = j;
if (swap) {
k = j;
l = i;
}
double u = (N - 1.0) / 2.0 - l;
double v = k - (N - 1.0) / 2.0;
// double u = 2.0 * k / (N - 1.0) - 1.0;
// double v = 2.0 * l / (N - 1.0);
double fx = 6.0 * u;
double fy = 6.0 * v;
values[0][m] = fx;
values[1][m] = fy;
values[2][m] = u;
values[3][m] = v;
m++;
}
}
FlatField field = new FlatField(flow_field, set);
field.setSamples(values);
DataReferenceImpl ref = new DataReferenceImpl("ref");
ref.setData(field);
display.addReference(ref);
// create JFrame (i.e., a window) for display and slider
JFrame frame = new JFrame("test FlowTest");
frame.addWindowListener(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
// create JPanel in JFrame
JPanel panel = new JPanel();
panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
panel.setAlignmentY(JPanel.TOP_ALIGNMENT);
panel.setAlignmentX(JPanel.LEFT_ALIGNMENT);
frame.getContentPane().add(panel);
// add display to JPanel
panel.add(display.getComponent());
// set size of JFrame and make it visible
frame.setSize(500, 500);
frame.setVisible(true);
}