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package de.lmu.ifi.dbs.elki.visualization.style.marker;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2011
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 org.apache.batik.util.SVGConstants;
import org.w3c.dom.Element;
import de.lmu.ifi.dbs.elki.visualization.colors.ColorLibrary;
import de.lmu.ifi.dbs.elki.visualization.style.StyleLibrary;
import de.lmu.ifi.dbs.elki.visualization.svg.SVGPlot;
import de.lmu.ifi.dbs.elki.visualization.svg.SVGUtil;
/**
* Marker library achieving a larger number of styles by combining different
* shapes with different colors. Uses object ID management by SVGPlot.
*
* @author Erich Schubert
*
* @apiviz.composedOf ColorLibrary
*/
public class PrettyMarkers implements MarkerLibrary {
/**
* Color library
*/
private ColorLibrary colors;
/**
* Default prefix to use.
*/
private final static String DEFAULT_PREFIX = "s";
/**
* Prefix for the IDs generated.
*/
private String prefix;
/**
* Constructor
*
* @param prefix prefix to use.
* @param style style library to use
*/
public PrettyMarkers(String prefix, StyleLibrary style) {
this.prefix = prefix;
this.colors = style.getColorSet(StyleLibrary.PLOT);
}
/**
* Constructor without prefix argument, will use {@link #DEFAULT_PREFIX} as
* prefix.
*
* @param style Style library to use
*/
public PrettyMarkers(StyleLibrary style) {
this(DEFAULT_PREFIX, style);
}
/**
* Draw an marker used in scatter plots. If you intend to use the markers
* multiple times, you should consider using the {@link #useMarker} method
* instead, which exploits the SVG features of symbol definition and use
*
* @param plot containing plot
* @param parent parent node
* @param x position
* @param y position
* @param style marker style (enumerated)
* @param size size
*/
public void plotMarker(SVGPlot plot, Element parent, double x, double y, int style, double size) {
assert (parent != null);
// TODO: add more styles.
String colorstr = colors.getColor(style);
String strokestyle = SVGConstants.CSS_STROKE_PROPERTY + ":" + colorstr + ";" + SVGConstants.CSS_STROKE_WIDTH_PROPERTY + ":" + SVGUtil.fmt(size / 6);
switch(style % 8){
case 0: {
// + cross
Element line1 = plot.svgLine(x, y - size / 2.2, x, y + size / 2.2);
SVGUtil.setStyle(line1, strokestyle);
parent.appendChild(line1);
Element line2 = plot.svgLine(x - size / 2.2, y, x + size / 2.2, y);
SVGUtil.setStyle(line2, strokestyle);
parent.appendChild(line2);
break;
}
case 1: {
// X cross
Element line1 = plot.svgLine(x - size / 2.828427, y - size / 2.828427, x + size / 2.828427, y + size / 2.828427);
SVGUtil.setStyle(line1, strokestyle);
parent.appendChild(line1);
Element line2 = plot.svgLine(x - size / 2.828427, y + size / 2.828427, x + size / 2.828427, y - size / 2.828427);
SVGUtil.setStyle(line2, strokestyle);
parent.appendChild(line2);
break;
}
case 2: {
// O hollow circle
Element circ = plot.svgCircle(x, y, size / 2.2);
SVGUtil.setStyle(circ, "fill: none;" + strokestyle);
parent.appendChild(circ);
break;
}
case 3: {
// [] hollow rectangle
Element rect = plot.svgRect(x - size / 2.4, y - size / 2.4, size / 1.2, size / 1.2);
SVGUtil.setStyle(rect, "fill: none;" + strokestyle);
parent.appendChild(rect);
break;
}
case 4: {
// <> hollow diamond
Element rect = plot.svgRect(x - size / 2.7, y - size / 2.7, size / 1.35, size / 1.35);
SVGUtil.setStyle(rect, "fill: none;" + strokestyle);
SVGUtil.setAtt(rect, SVGConstants.SVG_TRANSFORM_ATTRIBUTE, "rotate(45," + SVGUtil.fmt(x) + "," + SVGUtil.fmt(y) + ")");
parent.appendChild(rect);
break;
}
case 5: {
// O filled circle
Element circ = plot.svgCircle(x, y, size / 2);
SVGUtil.setStyle(circ, SVGConstants.CSS_FILL_PROPERTY + ":" + colorstr);
parent.appendChild(circ);
break;
}
case 6: {
// [] filled rectangle
Element rect = plot.svgRect(x - size / 2.2, y - size / 2.2, size / 1.1, size / 1.1);
SVGUtil.setStyle(rect, "fill:" + colorstr);
parent.appendChild(rect);
break;
}
case 7: {
// <> filled diamond
Element rect = plot.svgRect(x - size / 2.5, y - size / 2.5, size / 1.25, size / 1.25);
SVGUtil.setStyle(rect, "fill:" + colorstr);
SVGUtil.setAtt(rect, SVGConstants.SVG_TRANSFORM_ATTRIBUTE, "rotate(45," + SVGUtil.fmt(x) + "," + SVGUtil.fmt(y) + ")");
parent.appendChild(rect);
break;
}
}
}
@Override
public Element useMarker(SVGPlot plot, Element parent, double x, double y, int style, double size) {
String id = prefix + style + "_" + size;
Element existing = plot.getIdElement(id);
if(existing == null) {
Element symbol = plot.svgElement(SVGConstants.SVG_SYMBOL_TAG);
SVGUtil.setAtt(symbol, SVGConstants.SVG_WIDTH_ATTRIBUTE, 4 * size);
SVGUtil.setAtt(symbol, SVGConstants.SVG_HEIGHT_ATTRIBUTE, 4 * size);
SVGUtil.setAtt(symbol, SVGConstants.SVG_ID_ATTRIBUTE, id);
plotMarker(plot, symbol, 2 * size, 2 * size, style, 2 * size);
plot.getDefs().appendChild(symbol);
plot.putIdElement(id, symbol);
}
Element use = plot.svgElement(SVGConstants.SVG_USE_TAG);
use.setAttributeNS(SVGConstants.XLINK_NAMESPACE_URI, SVGConstants.XLINK_HREF_QNAME, "#" + id);
SVGUtil.setAtt(use, SVGConstants.SVG_X_ATTRIBUTE, x - 2 * size);
SVGUtil.setAtt(use, SVGConstants.SVG_Y_ATTRIBUTE, y - 2 * size);
if(parent != null) {
parent.appendChild(use);
}
return use;
}
}
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