CDK-JChemPaint #2: rendering reactions

I posted earlier today a Groovy script to render molecules with CDK-JChemPaint 8. Now, the new JChemPaint rendering engine also contains the functionality to render reactions. So, I can also do:

$ groovy renderReaction.groovy

The matching script:

import java.util.List;

import java.awt.*;
import java.awt.image.*;

import javax.imageio.*;
import javax.vecmath.*;

import org.openscience.cdk.*;
import org.openscience.cdk.geometry.*;
import org.openscience.cdk.interfaces.*;
import org.openscience.cdk.layout.*;
import org.openscience.cdk.renderer.*;
import org.openscience.cdk.renderer.font.*;
import org.openscience.cdk.renderer.generators.*;
import org.openscience.cdk.renderer.visitor.*;
import org.openscience.cdk.templates.*;

int WIDTH = 600;
int HEIGHT = 600;

// the draw area and the image should be the same size
Rectangle drawArea = new Rectangle(WIDTH, HEIGHT);
Image image = new BufferedImage(
  WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB
);

IMolecule benzene = MoleculeFactory.makeBenzene();
IMolecule triazole = MoleculeFactory.make123Triazole();
IReaction reaction = new Reaction();

StructureDiagramGenerator sdg = new StructureDiagramGenerator();
sdg.setMolecule(triazole);
sdg.generateCoordinates();
triazole = sdg.getMolecule();
sdg.setMolecule(benzene);
sdg.generateCoordinates();
benzene = sdg.getMolecule();
try {
GeometryTools.translate2DCenterTo(benzene, new Point2d(-4,0))
GeometryTools.translate2DCenterTo(triazole, new Point2d(4,0))
} catch (Exception e) {
 e.printStackTrace();
}

reaction.addReactant(benzene);
reaction.addProduct(triazole);

// generators make the image elements
List generators = new ArrayList();
generators.add(new BasicSceneGenerator());
generators.add(new BasicBondGenerator());
generators.add(new BasicAtomGenerator());

 List reactiongenerators =
  new ArrayList();
reactiongenerators.add(new ReactionArrowGenerator());
reactiongenerators.add(new ReactionPlusGenerator());

// the renderer needs to have a toolkit-specific font manager
Renderer renderer = new Renderer(
  generators, reactiongenerators, new AWTFontManager()
);

// the call to 'setup' only needs to be done on the first paint
renderer.setup(reaction, drawArea);

// paint the background
Graphics2D g2 = (Graphics2D)image.getGraphics();
g2.setColor(Color.WHITE);
g2.fillRect(0, 0, WIDTH, HEIGHT);

// the paint method also needs a toolkit-specific renderer
renderer.paintReaction(reaction, new AWTDrawVisitor(g2));

ImageIO.write(
  (RenderedImage)image, "PNG", new File("reaction.png")
);