/*
* Copyright 2004-2011 H2 Group. Multiple-Licensed under the H2 License,
* Version 1.0, and under the Eclipse Public License, Version 1.0
* (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.build.doc;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
/**
* Create the images used in the railroad diagrams.
*/
public class RailroadImages {
private static final int SIZE = 128;
private static final int LINE_REPEAT = 32;
private static final int DIV = 8;
private static final int STROKE = 16;
private String outDir;
/**
* This method is called when executing this application from the command
* line.
*
* @param args the command line parameters
*/
public static void main(String... args) {
new RailroadImages().run("docs/html/images");
}
/**
* Create the images.
*
* @param out the target directory
*/
void run(String out) {
this.outDir = out;
new File(out).mkdirs();
BufferedImage img;
Graphics2D g;
img = new BufferedImage(SIZE, SIZE, BufferedImage.TYPE_INT_ARGB);
g = img.createGraphics();
for (int i = 0; i < 2; i++) {
setStroke(g, i);
g.drawLine(0, SIZE / 2, SIZE, SIZE / 2);
}
g.dispose();
savePng(img, "div-d.png");
img = new BufferedImage(SIZE, SIZE * LINE_REPEAT, BufferedImage.TYPE_INT_ARGB);
g = img.createGraphics();
for (int i = 0; i < 2; i++) {
setStroke(g, i);
g.drawLine(0, SIZE / 2, SIZE, SIZE / 2);
g.drawLine(SIZE / 2, SIZE, SIZE / 2, SIZE * LINE_REPEAT);
// g.drawLine(0, SIZE / 2, SIZE / 2, SIZE);
g.drawArc(-SIZE / 2, SIZE / 2, SIZE, SIZE, 0, 90);
}
g.dispose();
savePng(img, "div-ts.png");
savePng(flipHorizontal(img), "div-te.png");
img = new BufferedImage(SIZE, SIZE * LINE_REPEAT, BufferedImage.TYPE_INT_ARGB);
g = img.createGraphics();
for (int i = 0; i < 2; i++) {
setStroke(g, i);
g.drawArc(SIZE / 2, -SIZE / 2, SIZE, SIZE, 180, 270);
// g.drawLine(SIZE / 2, 0, SIZE, SIZE / 2);
}
savePng(img, "div-ls.png");
savePng(flipHorizontal(img), "div-le.png");
for (int i = 0; i < 2; i++) {
setStroke(g, i);
g.drawArc(SIZE / 2, -SIZE / 2, SIZE, SIZE, 180, 270);
g.drawLine(SIZE / 2, 0, SIZE / 2, SIZE * LINE_REPEAT);
}
g.dispose();
savePng(img, "div-ks.png");
savePng(flipHorizontal(img), "div-ke.png");
}
private void setStroke(Graphics2D g, int i) {
if (i == 0) {
g.setColor(Color.WHITE);
g.setStroke(new BasicStroke(STROKE * 2));
} else {
g.setColor(Color.BLACK);
g.setStroke(new BasicStroke(STROKE));
}
}
private void savePng(BufferedImage img, String fileName) {
int w = img.getWidth();
int h = img.getHeight();
BufferedImage smaller = new BufferedImage(w / DIV, h / DIV, img.getType());
Graphics2D g = smaller.createGraphics();
g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g.drawImage(img, 0, 0, w / DIV, h / DIV, 0, 0, w, h, null);
g.dispose();
try {
ImageIO.write(smaller, "png", new File(outDir + "/" + fileName));
} catch (IOException e) {
throw new RuntimeException(e);
}
}
private static BufferedImage flipHorizontal(BufferedImage img) {
int w = img.getWidth(), h = img.getHeight();
BufferedImage copy = new BufferedImage(w, h, img.getType());
Graphics2D g = copy.createGraphics();
g.drawImage(img, 0, 0, w, h, w, 0, 0, h, null);
g.dispose();
return copy;
}
}