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/* WatermarkPainter.java
* =========================================================================
* This file is part of the GrInvIn project - http://www.grinvin.org
*
* Copyright (C) 2005-2008 Universiteit Gent
*
* This program 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 2 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
* General Public License for more details.
*
* A copy of the GNU General Public License can be found in the file
* LICENSE.txt provided with the source distribution of this program (see
* the META-INF directory in the source jar). This license can also be
* found on the GNU website at http://www.gnu.org/licenses/gpl.html.
*
* If you did not receive a copy of the GNU General Public License along
* with this program, contact the lead developer, or write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
package org.grinvin.gui;
import java.awt.Color;
import java.awt.Component;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
/**
* Paint a 'watermark' onto a component consisting of repeated text slanted at an
* angle of 45 degrees
*/
public class WatermarkPainter {
//
private final int fontSize;
//
private final String watermark;
//
private final Color watermarkColor;
//
private final Font font;
/**
* Create a watermark painter with the given specs.
*/
public WatermarkPainter (int fontSize, String watermark, Color watermarkColor) {
this.fontSize = fontSize;
this.watermark = watermark;
this.watermarkColor = watermarkColor;
this.font = new Font ("SansSerif", Font.BOLD, fontSize);
}
/**
* Paint the watermark onto the background of the given component.
*/
public void paint(Component component, Graphics g) {
int width = component.getWidth();
int height = component.getHeight();
Graphics2D g2 = (Graphics2D)g.create();
g2.setFont(font);
g2.setColor(watermarkColor);
g2.translate(width/2, height/2);
g2.rotate(Math.PI/4);
int sw = g2.getFontMetrics().stringWidth(watermark);
int limit = (width + height)/2;
g2.drawString(watermark, -sw/2, fontSize/2);
for (int j=sw/2+fontSize; j < limit; j+=sw+fontSize) {
g2.drawString(watermark, j, fontSize/2);
g2.drawString(watermark, -j -sw, fontSize/2);
}
for (int i=4*fontSize; i < limit; i+= 4*fontSize) {
g2.drawString(watermark, -sw/2, fontSize/2 + i);
g2.drawString(watermark, -sw/2, fontSize/2 - i);
for (int j=sw/2+fontSize; j < limit; j+=sw+fontSize) {
g2.drawString(watermark, j, fontSize/2 + i);
g2.drawString(watermark, -j -sw, fontSize/2 + i);
g2.drawString(watermark, j, fontSize/2 - i);
g2.drawString(watermark, -j -sw, fontSize/2 - i);
}
for (int j=fontSize/2; j < limit; j+=sw+fontSize) {
g2.drawString(watermark, j, -3*fontSize/2 + i);
g2.drawString(watermark, -j -sw, -3*fontSize/2 + i);
g2.drawString(watermark, j, 5*fontSize/2 - i);
g2.drawString(watermark, -j -sw, 5*fontSize/2 - i);
}
}
}
}
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