Ejemplo n.º 1
0
 /**
  * Get the curve length; assumes curve is float[2][len] and seg_length is float[len-1]
  *
  * @param curve the curve
  * @param seg_length the segment lengths
  * @return the length of the curve
  */
 public static float curveLength(float[][] curve, float[] seg_length) {
   int len = curve[0].length;
   float curve_length = 0.0f;
   for (int i = 0; i < len - 1; i++) {
     seg_length[i] =
         (float)
             Math.sqrt(
                 ((curve[0][i + 1] - curve[0][i]) * (curve[0][i + 1] - curve[0][i]))
                     + ((curve[1][i + 1] - curve[1][i]) * (curve[1][i + 1] - curve[1][i])));
     curve_length += seg_length[i];
   }
   return curve_length;
 }
Ejemplo n.º 2
0
  /**
   * 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;
  }