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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) 2012
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.math.scales.LinearScale;
import de.lmu.ifi.dbs.elki.visualization.css.CSSClass;
import de.lmu.ifi.dbs.elki.visualization.css.CSSClassManager;
import de.lmu.ifi.dbs.elki.visualization.css.CSSClassManager.CSSNamingConflict;
import de.lmu.ifi.dbs.elki.visualization.style.StyleLibrary;
/**
* Class to draw a simple axis with tick marks on the plot.
*
* @author Erich Schubert
*
* @apiviz.uses CSSClass
* @apiviz.uses CSSClassManager
* @apiviz.uses LinearScale
* @apiviz.uses StyleLibrary
* @apiviz.uses Element oneway - - «create»
*/
public class SVGSimpleLinearAxis {
/**
* Flag for axis label position. First char: right-hand or left-hand side of
* line. Second char: text alignment
*
* @apiviz.exclude
*/
private enum Alignment {
LL, RL, LC, RC, LR, RR
}
/**
* Labeling style: left-handed, right-handed, no ticks, labels at ends
*
* @apiviz.exclude
*/
public enum LabelStyle {
LEFTHAND, RIGHTHAND, NOLABELS, NOTHING, ENDLABEL
}
/**
* CSS class name for the axes
*/
private static final String CSS_AXIS = "axis";
/**
* CSS class name for the axes
*/
private static final String CSS_AXIS_TICK = "axis-tick";
/**
* CSS class name for the axes
*/
private static final String CSS_AXIS_LABEL = "axis-label";
/**
* Register CSS classes with a {@link CSSClassManager}
*
* @param owner Owner of the CSS classes
* @param manager Manager to register the classes with
* @throws CSSNamingConflict when a name clash occurs
*/
private static void setupCSSClasses(Object owner, CSSClassManager manager, StyleLibrary style) throws CSSNamingConflict {
if(!manager.contains(CSS_AXIS)) {
CSSClass axis = new CSSClass(owner, CSS_AXIS);
axis.setStatement(SVGConstants.CSS_STROKE_PROPERTY, style.getColor(StyleLibrary.AXIS));
axis.setStatement(SVGConstants.CSS_STROKE_WIDTH_PROPERTY, style.getLineWidth(StyleLibrary.AXIS));
manager.addClass(axis);
}
if(!manager.contains(CSS_AXIS_TICK)) {
CSSClass tick = new CSSClass(owner, CSS_AXIS_TICK);
tick.setStatement(SVGConstants.CSS_STROKE_PROPERTY, style.getColor(StyleLibrary.AXIS_TICK));
tick.setStatement(SVGConstants.CSS_STROKE_WIDTH_PROPERTY, style.getLineWidth(StyleLibrary.AXIS_TICK));
manager.addClass(tick);
}
if(!manager.contains(CSS_AXIS_LABEL)) {
CSSClass label = new CSSClass(owner, CSS_AXIS_LABEL);
label.setStatement(SVGConstants.CSS_FILL_PROPERTY, style.getTextColor(StyleLibrary.AXIS_LABEL));
label.setStatement(SVGConstants.CSS_FONT_FAMILY_PROPERTY, style.getFontFamily(StyleLibrary.AXIS_LABEL));
label.setStatement(SVGConstants.CSS_FONT_SIZE_PROPERTY, style.getTextSize(StyleLibrary.AXIS_LABEL));
manager.addClass(label);
}
}
/**
* Plot an axis with appropriate scales
*
* @param plot Plot object
* @param parent Containing element
* @param scale axis scale information
* @param x1 starting coordinate
* @param y1 starting coordinate
* @param x2 ending coordinate
* @param y2 ending coordinate
* @param labelstyle Style for placing the labels
* @param style Style library
* @throws CSSNamingConflict when a conflict occurs in CSS
*/
public static void drawAxis(SVGPlot plot, Element parent, LinearScale scale, double x1, double y1, double x2, double y2, LabelStyle labelstyle, StyleLibrary style) throws CSSNamingConflict {
assert (parent != null);
Element line = plot.svgLine(x1, y1, x2, y2);
SVGUtil.setCSSClass(line, CSS_AXIS);
parent.appendChild(line);
final double tx = x2 - x1;
final double ty = y2 - y1;
// ticks are orthogonal
final double tw = ty * 0.01;
final double th = -tx * 0.01;
// choose where to print labels.
final boolean labels, ticks;
switch(labelstyle){
case LEFTHAND:
case RIGHTHAND:
labels = true;
ticks = true;
break;
case NOLABELS:
labels = false;
ticks = true;
break;
case ENDLABEL: // end labels are handle specially
case NOTHING:
default:
labels = false;
ticks = false;
}
Alignment pos = Alignment.LL;
if(labels) {
double angle = Math.atan2(ty, tx);
// System.err.println(tx + " " + (-ty) + " " + angle);
if(angle > 2.6) { // pi .. 2.6 = 180 .. 150
pos = labelstyle == LabelStyle.RIGHTHAND ? Alignment.RC : Alignment.LC;
}
else if(angle > 0.5) { // 2.3 .. 0.7 = 130 .. 40
pos = labelstyle == LabelStyle.RIGHTHAND ? Alignment.RR : Alignment.LL;
}
else if(angle > -0.5) { // 0.5 .. -0.5 = 30 .. -30
pos = labelstyle == LabelStyle.RIGHTHAND ? Alignment.RC : Alignment.LC;
}
else if(angle > -2.6) { // -0.5 .. -2.6 = -30 .. -150
pos = labelstyle == LabelStyle.RIGHTHAND ? Alignment.RL : Alignment.LR;
}
else { // -2.6 .. -pi = -150 .. -180
pos = labelstyle == LabelStyle.RIGHTHAND ? Alignment.RC : Alignment.LC;
}
}
// vertical text offset; align approximately with middle instead of
// baseline.
double textvoff = style.getTextSize(StyleLibrary.AXIS_LABEL) * .35;
// draw ticks on x axis
if(ticks || labels) {
int sw = 1;
{ // Compute how many ticks to draw
int numticks = (int) ((scale.getMax() - scale.getMin()) / scale.getRes());
double tlen = Math.sqrt(tx * tx + ty * ty);
double minl = 10 * style.getLineWidth(StyleLibrary.AXIS_TICK);
// Try proper divisors first.
if(sw * tlen / numticks < minl) {
for(int i = 2; i <= (numticks >> 1); i++) {
if(numticks % i == 0) {
if(i * tlen / numticks >= minl) {
sw = i;
break;
}
}
}
}
// Otherwise, also allow non-divisors.
if(sw * tlen / numticks < minl) {
sw = (int)Math.floor(minl * numticks / tlen);
}
}
for(double tick = scale.getMin(); tick <= scale.getMax() + scale.getRes() / 10; tick += sw * scale.getRes()) {
double x = x1 + tx * scale.getScaled(tick);
double y = y1 + ty * scale.getScaled(tick);
if(ticks) {
// This is correct. Vectors: (vec - tvec) to (vec + tvec)
Element tickline = plot.svgLine(x - tw, y - th, x + tw, y + th);
SVGUtil.setAtt(tickline, SVGConstants.SVG_CLASS_ATTRIBUTE, CSS_AXIS_TICK);
parent.appendChild(tickline);
}
// draw labels
if(labels) {
double tex = x;
double tey = y;
switch(pos){
case LL:
case LC:
case LR:
tex = x + tw * 2.5;
tey = y + th * 2.5 + textvoff;
break;
case RL:
case RC:
case RR:
tex = x - tw * 2.5;
tey = y - th * 2.5 + textvoff;
}
Element text = plot.svgText(tex, tey, scale.formatValue(tick));
text.setAttribute(SVGConstants.SVG_CLASS_ATTRIBUTE, CSS_AXIS_LABEL);
switch(pos){
case LL:
case RL:
text.setAttribute(SVGConstants.SVG_TEXT_ANCHOR_ATTRIBUTE, SVGConstants.SVG_START_VALUE);
break;
case LC:
case RC:
text.setAttribute(SVGConstants.SVG_TEXT_ANCHOR_ATTRIBUTE, SVGConstants.SVG_MIDDLE_VALUE);
break;
case LR:
case RR:
text.setAttribute(SVGConstants.SVG_TEXT_ANCHOR_ATTRIBUTE, SVGConstants.SVG_END_VALUE);
break;
}
parent.appendChild(text);
}
}
}
if(labelstyle == LabelStyle.ENDLABEL) {
{
Element text = plot.svgText(x1 - tx * 0.02, y1 - ty * 0.02 + textvoff, scale.formatValue(scale.getMin()));
text.setAttribute(SVGConstants.SVG_CLASS_ATTRIBUTE, CSS_AXIS_LABEL);
text.setAttribute(SVGConstants.SVG_TEXT_ANCHOR_ATTRIBUTE, SVGConstants.SVG_MIDDLE_VALUE);
parent.appendChild(text);
}
{
Element text = plot.svgText(x2 + tx * 0.02, y2 + ty * 0.02 + textvoff, scale.formatValue(scale.getMax()));
text.setAttribute(SVGConstants.SVG_CLASS_ATTRIBUTE, CSS_AXIS_LABEL);
text.setAttribute(SVGConstants.SVG_TEXT_ANCHOR_ATTRIBUTE, SVGConstants.SVG_MIDDLE_VALUE);
parent.appendChild(text);
}
}
setupCSSClasses(plot, plot.getCSSClassManager(), style);
}
}
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