/**
 * Example written by Bruno Lowagie in answer to:
 * http://stackoverflow.com/questions/20909450/correct-text-position-center-in-rectangle-itext
 * 
 * Doing some font math to vertically fit a piece of text inside a rectangle.
 */
package sandbox.objects;

import com.itextpdf.text.BaseColor;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.ColumnText;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfWriter;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import sandbox.WrapToTest;

@WrapToTest
public class FitTextInRectangle {

    public static final String DEST = "results/objects/chunk_in_rectangle.pdf";
    
    public static void main(String[] args) throws IOException, DocumentException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new FitTextInRectangle().createPdf(DEST);
    }
    
    public void createPdf(String dest) throws IOException, DocumentException {
        Document document = new Document();
        PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(dest));
        document.open();
        
        // the direct content
        PdfContentByte cb = writer.getDirectContent();
        // the rectangle and the text we want to fit in the rectangle
        Rectangle rect = new Rectangle(100, 150, 220, 200);
        String text = "test";
        // try to get max font size that fit in rectangle
        BaseFont bf = BaseFont.createFont();
        int textHeightInGlyphSpace = bf.getAscent(text) - bf.getDescent(text);
        float fontSize = 1000f * rect.getHeight() / textHeightInGlyphSpace;
        Phrase phrase = new Phrase("test", new Font(bf, fontSize));
        ColumnText.showTextAligned(cb, Element.ALIGN_CENTER, phrase,
                // center horizontally
                (rect.getLeft() + rect.getRight()) / 2,
                // shift baseline based on descent
                rect.getBottom() - bf.getDescentPoint(text, fontSize),
                0);

        // draw the rect
        cb.saveState();
        cb.setColorStroke(BaseColor.BLUE);
        cb.rectangle(rect.getLeft(), rect.getBottom(), rect.getWidth(), rect.getHeight());
        cb.stroke();
        cb.restoreState();
        
        document.close();
    }
}