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/*
* Copyright (c) 2010-2021 Haifeng Li. All rights reserved.
*
* Smile is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Smile 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Smile. If not, see .
*/
package smile.plot.swing;
import java.awt.Color;
import java.awt.Font;
import smile.math.MathEx;
/**
* Label is a single line text.
*
* @author Haifeng Li
*/
public class Label extends Shape {
/** The default JLabel font may vary on different systems. */
private static Font DefaultFont = new javax.swing.JLabel().getFont();
/**
* The text of label.
*/
final String text;
/**
* The coordinates of label.
*/
final double[] coordinates;
/**
* The reference position of coordinates respected to dimension of text.
* (0.5, 0.5) is center, (0, 0) is lower left, (0, 1) is upper left, etc.
*/
final double horizontalReference;
/**
* The reference position of coordinates respected to dimension of text.
* (0.5, 0.5) is center, (0, 0) is lower left, (0, 1) is upper left, etc.
*/
final double verticalReference;
/**
* The rotation angel of text.
*/
final double rotation;
/**
* The font for rendering the text. Use the system default font if this is
* null.
*/
final Font font;
/**
* Constructor.
*/
public Label(String text, double[] coordinates, double horizontalReference, double verticalReference, double rotation, Font font, Color color) {
super(color);
this.text = text;
this.coordinates = coordinates;
this.horizontalReference = horizontalReference;
this.verticalReference = verticalReference;
this.rotation = rotation;
this.font = font;
}
@Override
public void paint(Graphics g) {
Font f = g.getFont();
if (font != null) g.setFont(font);
Color c = g.getColor();
g.setColor(color);
g.drawText(text, coordinates, horizontalReference, verticalReference, rotation);
g.setColor(c);
if (font != null) g.setFont(f);
}
/**
* Convert coordinate to a string.
*/
private static String coordinatesToString(double... c) {
StringBuilder builder = new StringBuilder("(");
for (int i = 0; i < c.length; i++) {
builder.append(MathEx.round(c[i], 2)).append(",");
}
if (c.length > 0) {
builder.setCharAt(builder.length(), ')');
} else {
builder.append(")");
}
return builder.toString();
}
/**
* Creates a black label centered at the coordinates.
*/
public static Label of(String text, double[] coordinates) {
return Label.of(text, coordinates, 0.5, 0.5, 0.0);
}
/**
* Creates a black label with coordinates as text.
*/
public static Label of(double... coordinates) {
return Label.of(coordinatesToString(coordinates), coordinates, 0.5, 0.5, 0.0);
}
/**
* Creates a black label with system default font.
*/
public static Label of(String text, double[] coordinates, double horizontalReference, double verticalReference, double rotation) {
return new Label(text, coordinates, horizontalReference, verticalReference, rotation, DefaultFont, Color.BLACK);
}
}
