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package de.lmu.ifi.dbs.elki.visualization.svg;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2014
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import java.util.BitSet;
import org.w3c.dom.Element;
import de.lmu.ifi.dbs.elki.data.NumberVector;
import de.lmu.ifi.dbs.elki.visualization.projections.Projection2D;
/**
* Utility class to draw hypercubes, wireframe and filled.
*
* @author Erich Schubert
*
* @apiviz.uses SVGPath
* @apiviz.uses Projection2D
*/
public class SVGHyperSphere {
/**
* Factor used for approximating circles with cubic beziers.
*
* kappa = 4 * (Math.sqrt(2)-1)/3
*/
public static final double EUCLIDEAN_KAPPA = 0.5522847498;
/**
* Wireframe "manhattan" hypersphere
*
* @param svgp SVG Plot
* @param proj Visualization projection
* @param mid mean vector
* @param radius radius
* @return path element
*/
public static Element drawManhattan(SVGPlot svgp, Projection2D proj, NumberVector mid, double radius) {
final double[] v_mid = mid.getColumnVector().getArrayRef(); // a copy
final BitSet dims = proj.getVisibleDimensions2D();
SVGPath path = new SVGPath();
for (int dim = dims.nextSetBit(0); dim >= 0; dim = dims.nextSetBit(dim + 1)) {
v_mid[dim] += radius;
double[] p1 = proj.fastProjectDataToRenderSpace(v_mid);
v_mid[dim] -= radius;
v_mid[dim] -= radius;
double[] p2 = proj.fastProjectDataToRenderSpace(v_mid);
v_mid[dim] += radius;
for (int dim2 = dims.nextSetBit(0); dim2 >= 0; dim2 = dims.nextSetBit(dim2 + 1)) {
if (dim < dim2) {
v_mid[dim2] += radius;
double[] p3 = proj.fastProjectDataToRenderSpace(v_mid);
v_mid[dim2] -= radius;
v_mid[dim2] -= radius;
double[] p4 = proj.fastProjectDataToRenderSpace(v_mid);
v_mid[dim2] += radius;
path.moveTo(p1[0], p1[1]);
path.drawTo(p3[0], p3[1]);
path.moveTo(p1[0], p1[1]);
path.drawTo(p4[0], p4[1]);
path.moveTo(p2[0], p2[1]);
path.drawTo(p3[0], p3[1]);
path.moveTo(p2[0], p2[1]);
path.drawTo(p4[0], p4[1]);
path.close();
}
}
}
return path.makeElement(svgp);
}
/**
* Wireframe "euclidean" hypersphere
*
* @param svgp SVG Plot
* @param proj Visualization projection
* @param mid mean vector
* @param radius radius
* @return path element
*/
public static Element drawEuclidean(SVGPlot svgp, Projection2D proj, NumberVector mid, double radius) {
double[] v_mid = mid.getColumnVector().getArrayRef(); // a copy
BitSet dims = proj.getVisibleDimensions2D();
SVGPath path = new SVGPath();
for (int dim = dims.nextSetBit(0); dim >= 0; dim = dims.nextSetBit(dim + 1)) {
v_mid[dim] += radius;
double[] p1 = proj.fastProjectDataToRenderSpace(v_mid);
v_mid[dim] -= radius;
v_mid[dim] -= radius;
double[] p2 = proj.fastProjectDataToRenderSpace(v_mid);
v_mid[dim] += radius;
// delta vector
double[] dt1 = new double[v_mid.length];
dt1[dim] = radius;
double[] d1 = proj.fastProjectRelativeDataToRenderSpace(dt1);
for (int dim2 = dims.nextSetBit(0); dim2 >= 0; dim2 = dims.nextSetBit(dim2 + 1)) {
if (dim < dim2) {
v_mid[dim2] += radius;
double[] p3 = proj.fastProjectDataToRenderSpace(v_mid);
v_mid[dim2] -= radius;
v_mid[dim2] -= radius;
double[] p4 = proj.fastProjectDataToRenderSpace(v_mid);
v_mid[dim2] += radius;
// delta vector
double[] dt2 = new double[v_mid.length];
dt2[dim2] = radius;
double[] d2 = proj.fastProjectRelativeDataToRenderSpace(dt2);
path.moveTo(p1[0], p1[1]);
path.cubicTo(p1[0] + d2[0] * EUCLIDEAN_KAPPA, p1[1] + d2[1] * EUCLIDEAN_KAPPA, p3[0] + d1[0] * EUCLIDEAN_KAPPA, p3[1] + d1[1] * EUCLIDEAN_KAPPA, p3[0], p3[1]);
path.cubicTo(p3[0] - d1[0] * EUCLIDEAN_KAPPA, p3[1] - d1[1] * EUCLIDEAN_KAPPA, p2[0] + d2[0] * EUCLIDEAN_KAPPA, p2[1] + d2[1] * EUCLIDEAN_KAPPA, p2[0], p2[1]);
path.cubicTo(p2[0] - d2[0] * EUCLIDEAN_KAPPA, p2[1] - d2[1] * EUCLIDEAN_KAPPA, p4[0] - d1[0] * EUCLIDEAN_KAPPA, p4[1] - d1[1] * EUCLIDEAN_KAPPA, p4[0], p4[1]);
path.cubicTo(p4[0] + d1[0] * EUCLIDEAN_KAPPA, p4[1] + d1[1] * EUCLIDEAN_KAPPA, p1[0] - d2[0] * EUCLIDEAN_KAPPA, p1[1] - d2[1] * EUCLIDEAN_KAPPA, p1[0], p1[1]);
path.close();
}
}
}
return path.makeElement(svgp);
}
/**
* Wireframe "Lp" hypersphere
*
* @param svgp SVG Plot
* @param proj Visualization projection
* @param mid mean vector
* @param radius radius
* @param p L_p value
* @return path element
*/
public static Element drawLp(SVGPlot svgp, Projection2D proj, NumberVector mid, double radius, double p) {
final double[] v_mid = mid.getColumnVector().getArrayRef();
final BitSet dims = proj.getVisibleDimensions2D();
final double kappax, kappay;
if (p > 1.) {
final double kappal = Math.pow(0.5, 1. / p);
kappax = Math.min(1.3, 4. * (2 * kappal - 1) / 3.);
kappay = 0;
} else if (p < 1.) {
final double kappal = 1 - Math.pow(0.5, 1. / p);
kappax = 0;
kappay = Math.min(1.3, 4. * (2 * kappal - 1) / 3.);
} else {
kappax = 0;
kappay = 0;
}
// LoggingUtil.warning("kappax: " + kappax + " kappay: " + kappay);
SVGPath path = new SVGPath();
for (int dim = dims.nextSetBit(0); dim >= 0; dim = dims.nextSetBit(dim + 1)) {
v_mid[dim] += radius;
double[] pvp0 = proj.fastProjectDataToRenderSpace(v_mid);
v_mid[dim] -= radius;
v_mid[dim] -= radius;
double[] pvm0 = proj.fastProjectDataToRenderSpace(v_mid);
v_mid[dim] += radius;
// delta vector
double[] tvd0 = new double[v_mid.length];
tvd0[dim] = radius;
double[] vd0 = proj.fastProjectRelativeDataToRenderSpace(tvd0);
for (int dim2 = dims.nextSetBit(0); dim2 >= 0; dim2 = dims.nextSetBit(dim2 + 1)) {
if (dim < dim2) {
v_mid[dim2] += radius;
double[] pv0p = proj.fastProjectDataToRenderSpace(v_mid);
v_mid[dim2] -= radius;
v_mid[dim2] -= radius;
double[] pv0m = proj.fastProjectDataToRenderSpace(v_mid);
v_mid[dim2] += radius;
// delta vector
double[] tv0d = new double[v_mid.length];
tv0d[dim2] = radius;
double[] v0d = proj.fastProjectRelativeDataToRenderSpace(tv0d);
if (p > 1) {
// p > 1
path.moveTo(pvp0[0], pvp0[1]);
// support points, p0 to 0p
final double s_pp1_x = pvp0[0] + v0d[0] * kappax;
final double s_pp1_y = pvp0[1] + v0d[1] * kappax;
final double s_pp2_x = pv0p[0] + vd0[0] * kappax;
final double s_pp2_y = pv0p[1] + vd0[1] * kappax;
path.cubicTo(s_pp1_x, s_pp1_y, s_pp2_x, s_pp2_y, pv0p[0], pv0p[1]);
// support points, 0p to m0
final double s_mp1_x = pv0p[0] - vd0[0] * kappax;
final double s_mp1_y = pv0p[1] - vd0[1] * kappax;
final double s_mp2_x = pvm0[0] + v0d[0] * kappax;
final double s_mp2_y = pvm0[1] + v0d[1] * kappax;
path.cubicTo(s_mp1_x, s_mp1_y, s_mp2_x, s_mp2_y, pvm0[0], pvm0[1]);
// support points, m0 to 0m
final double s_mm1_x = pvm0[0] - v0d[0] * kappax;
final double s_mm1_y = pvm0[1] - v0d[1] * kappax;
final double s_mm2_x = pv0m[0] - vd0[0] * kappax;
final double s_mm2_y = pv0m[1] - vd0[1] * kappax;
path.cubicTo(s_mm1_x, s_mm1_y, s_mm2_x, s_mm2_y, pv0m[0], pv0m[1]);
// support points, 0m to p0
final double s_pm1_x = pv0m[0] + vd0[0] * kappax;
final double s_pm1_y = pv0m[1] + vd0[1] * kappax;
final double s_pm2_x = pvp0[0] - v0d[0] * kappax;
final double s_pm2_y = pvp0[1] - v0d[1] * kappax;
path.cubicTo(s_pm1_x, s_pm1_y, s_pm2_x, s_pm2_y, pvp0[0], pvp0[1]);
path.close();
} else if (p < 1) {
// p < 1
// support points, p0 to 0p
final double s_vp0_x = pvp0[0] - vd0[0] * kappay;
final double s_vp0_y = pvp0[1] - vd0[1] * kappay;
final double s_v0p_x = pv0p[0] - v0d[0] * kappay;
final double s_v0p_y = pv0p[1] - v0d[1] * kappay;
final double s_vm0_x = pvm0[0] + vd0[0] * kappay;
final double s_vm0_y = pvm0[1] + vd0[1] * kappay;
final double s_v0m_x = pv0m[0] + v0d[0] * kappay;
final double s_v0m_y = pv0m[1] + v0d[1] * kappay;
// Draw the star
path.moveTo(pvp0[0], pvp0[1]);
path.cubicTo(s_vp0_x, s_vp0_y, s_v0p_x, s_v0p_y, pv0p[0], pv0p[1]);
path.cubicTo(s_v0p_x, s_v0p_y, s_vm0_x, s_vm0_y, pvm0[0], pvm0[1]);
path.cubicTo(s_vm0_x, s_vm0_y, s_v0m_x, s_v0m_y, pv0m[0], pv0m[1]);
path.cubicTo(s_v0m_x, s_v0m_y, s_vp0_x, s_vp0_y, pvp0[0], pvp0[1]);
path.close();
} else {
// p == 1 - Manhattan
path.moveTo(pvp0[0], pvp0[1]);
path.lineTo(pv0p[0], pv0p[1]);
path.lineTo(pvm0[0], pvm0[1]);
path.lineTo(pv0m[0], pv0m[1]);
path.lineTo(pvp0[0], pvp0[1]);
path.close();
}
}
}
}
return path.makeElement(svgp);
}
/**
* Wireframe "cross" hypersphere
*
* @param svgp SVG Plot
* @param proj Visualization projection
* @param mid mean vector
* @param radius radius
* @return path element
*/
public static Element drawCross(SVGPlot svgp, Projection2D proj, NumberVector mid, double radius) {
final double[] v_mid = mid.getColumnVector().getArrayRef();
final BitSet dims = proj.getVisibleDimensions2D();
SVGPath path = new SVGPath();
for (int dim = dims.nextSetBit(0); dim >= 0; dim = dims.nextSetBit(dim + 1)) {
v_mid[dim] += radius;
double[] p1 = proj.fastProjectDataToRenderSpace(v_mid);
v_mid[dim] -= radius;
path.moveTo(p1[0], p1[1]);
v_mid[dim] -= radius;
double[] p2 = proj.fastProjectDataToRenderSpace(v_mid);
v_mid[dim] += radius;
path.drawTo(p2[0], p2[1]);
path.close();
}
return path.makeElement(svgp);
}
}
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