TextRenderer.java

/*
 * JasperReports - Free Java Reporting Library.
 * Copyright (C) 2001 - 2009 Jaspersoft Corporation. All rights reserved.
 * http://www.jaspersoft.com
 *
 * Unless you have purchased a commercial license agreement from Jaspersoft,
 * the following license terms apply:
 *
 * This program is part of JasperReports.
 *
 * JasperReports is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JasperReports 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with JasperReports. If not, see <http://www.gnu.org/licenses/>.
 */
package net.sf.jasperreports.engine.export;

import java.awt.Graphics2D;
import java.awt.font.FontRenderContext;
import java.awt.font.LineBreakMeasurer;
import java.awt.font.TextLayout;
import java.text.AttributedCharacterIterator;
import java.text.AttributedString;
import java.util.StringTokenizer;

import net.sf.jasperreports.engine.type.HorizontalAlignEnum;
import net.sf.jasperreports.engine.type.VerticalAlignEnum;
import net.sf.jasperreports.engine.util.JRProperties;
import net.sf.jasperreports.engine.util.JRStyledText;
import net.sf.jasperreports.engine.util.MaxFontSizeFinder;


/**
 * @author Teodor Danciu (teodord@users.sourceforge.net)
 * @version $Id: TextRenderer.java 3419 2010-02-18 08:16:30Z teodord $
 */
public class TextRenderer
{
	public static final FontRenderContext LINE_BREAK_FONT_RENDER_CONTEXT = new FontRenderContext(null, true, true);

	private Graphics2D grx = null;
	private int x = 0;
	private int y = 0;
	private int topPadding = 0;
	private int leftPadding = 0;
	private float formatWidth = 0;
	private float verticalOffset = 0;
	private float lineSpacingFactor = 0;
	private float leadingOffset = 0;
	private float textHeight = 0;
	private float drawPosY = 0;
	private float drawPosX = 0;
	private boolean isMaxHeightReached = false;
	private HorizontalAlignEnum horizontalAlignment = null;
	private int fontSize = 0;
	
	/**
	 * 
	 */
	private MaxFontSizeFinder maxFontSizeFinder = null;
	
	/**
	 * 
	 */
	private boolean isMinimizePrinterJobSize = true;
	private boolean ignoreMissingFont = false;

	
	/**
	 * 
	 */
	public static TextRenderer getInstance()
	{
		return 
			new TextRenderer(
				JRProperties.getBooleanProperty(JRGraphics2DExporter.MINIMIZE_PRINTER_JOB_SIZE),
				JRProperties.getBooleanProperty(JRStyledText.PROPERTY_AWT_IGNORE_MISSING_FONT)
				);
	}
	
	
	/**
	 * 
	 */
	public TextRenderer(
		boolean isMinimizePrinterJobSize,
		boolean ignoreMissingFont
		)
	{
		this.isMinimizePrinterJobSize = isMinimizePrinterJobSize;
		this.ignoreMissingFont = ignoreMissingFont;
	}
	
	
	/**
	 * 
	 */
	public void render(
		Graphics2D initGrx,
		int initX,
		int initY,
		int initWidth,
		int initHeight,
		int initTopPadding,
		int initLeftPadding,
		int initBottomPadding,
		int initRightPadding,
		float initTextHeight,
		HorizontalAlignEnum initHorizontalAlignment,
		VerticalAlignEnum initVerticalAlignment,
		float initLineSpacingFactor,
		float initLeadingOffset,
		int initFontSize,
		boolean isStyledText,
		JRStyledText styledText,
		String allText
		)
	{
		/*   */
		initialize(
			initGrx, 
			initX, 
			initY, 
			initWidth, 
			initHeight, 
			initTopPadding,
			initLeftPadding,
			initBottomPadding,
			initRightPadding,
			initTextHeight, 
			initHorizontalAlignment, 
			initVerticalAlignment, 
			initLineSpacingFactor,
			initLeadingOffset,
			initFontSize,
			isStyledText
			);
		
		AttributedCharacterIterator allParagraphs = 
			styledText.getAwtAttributedString(ignoreMissingFont).getIterator();

		int tokenPosition = 0;
		int lastParagraphStart = 0;
		String lastParagraphText = null;

		StringTokenizer tkzer = new StringTokenizer(allText, "\n", true);

		while(tkzer.hasMoreTokens() && !isMaxHeightReached) 
		{
			String token = tkzer.nextToken();

			if ("\n".equals(token))
			{
				renderParagraph(allParagraphs, lastParagraphStart, lastParagraphText);

				lastParagraphStart = tokenPosition;
				lastParagraphText = null;
			}
			else
			{
				lastParagraphStart = tokenPosition;
				lastParagraphText = token;
			}

			tokenPosition += token.length();
		}

		if (!isMaxHeightReached && lastParagraphStart < allText.length())
		{
			renderParagraph(allParagraphs, lastParagraphStart, lastParagraphText);
		}
	}


	/**
	 * 
	 */
	private void initialize(
		Graphics2D initGrx,
		int initX,
		int initY,
		int initWidth,
		int initHeight,
		int initTopPadding,
		int initLeftPadding,
		int initBottomPadding,
		int initRightPadding,
		float initTextHeight,
		HorizontalAlignEnum initHorizontalAlignment,
		VerticalAlignEnum initVerticalAlignment,
		float initLineSpacingFactor,
		float initLeadingOffset,
		int initFontSize,
		boolean isStyledText
		)
	{
		this.grx = initGrx;
		
		this.horizontalAlignment = initHorizontalAlignment;

		verticalOffset = 0f;
		switch (initVerticalAlignment)
		{
			case TOP :
			{
				verticalOffset = 0f;
				break;
			}
			case MIDDLE :
			{
				verticalOffset = (initHeight - initTopPadding - initBottomPadding - initTextHeight) / 2f;
				break;
			}
			case BOTTOM :
			{
				verticalOffset = initHeight - initTopPadding - initBottomPadding - initTextHeight;
				break;
			}
			default :
			{
				verticalOffset = 0f;
			}
		}

		this.lineSpacingFactor = initLineSpacingFactor;
		this.leadingOffset = initLeadingOffset;

		this.x = initX;
		this.y = initY;
		this.topPadding = initTopPadding;
		this.leftPadding = initLeftPadding;
		formatWidth = initWidth - initLeftPadding - initRightPadding;
		formatWidth = formatWidth < 0 ? 0 : formatWidth;
		this.textHeight = initTextHeight;

		drawPosY = 0;
		drawPosX = 0;
	
		isMaxHeightReached = false;
		
		this.fontSize = initFontSize;
		maxFontSizeFinder = MaxFontSizeFinder.getInstance(isStyledText);
	}
	
	/**
	 * 
	 */
	private void renderParagraph(
		AttributedCharacterIterator allParagraphs,
		int lastParagraphStart,
		String lastParagraphText
		)
	{
		AttributedCharacterIterator paragraph = null;
		
		if (lastParagraphText == null)
		{
			paragraph = 
				new AttributedString(
					" ",
					new AttributedString(
						allParagraphs, 
						lastParagraphStart, 
						lastParagraphStart + 1
						).getIterator().getAttributes()
					).getIterator();
		}
		else
		{
			paragraph = 
				new AttributedString(
					allParagraphs, 
					lastParagraphStart, 
					lastParagraphStart + lastParagraphText.length()
					).getIterator();
		}

		LineBreakMeasurer lineMeasurer = new LineBreakMeasurer(paragraph, LINE_BREAK_FONT_RENDER_CONTEXT);//grx.getFontRenderContext()
	
		while (lineMeasurer.getPosition() < paragraph.getEndIndex() && !isMaxHeightReached)
		{
			//eugene fix - start
			int startIndex = lineMeasurer.getPosition();
			//eugene fix - end

			TextLayout layout = lineMeasurer.nextLayout(formatWidth);

			if (isMinimizePrinterJobSize)
			{
				//eugene fix - start
				AttributedString tmpText = 
					new AttributedString(
						paragraph, 
						startIndex, 
						startIndex + layout.getCharacterCount()
						);
				layout = new TextLayout(tmpText.getIterator(), grx.getFontRenderContext());
				//eugene fix - end
			}

			float lineHeight = lineSpacingFactor * 
				maxFontSizeFinder.findMaxFontSize(
					new AttributedString(
						paragraph, 
						startIndex, 
						startIndex + layout.getCharacterCount()
						).getIterator(),
					fontSize
					);

			if (drawPosY + lineHeight <= textHeight)
			{
				drawPosY += lineHeight;
				
				switch (horizontalAlignment)
				{
					case JUSTIFIED :
					{
						if (layout.isLeftToRight())
						{
							drawPosX = 0;
						}
						else
						{
							drawPosX = formatWidth - layout.getAdvance();
						}
						if (lineMeasurer.getPosition() < paragraph.getEndIndex())
						{
							layout = layout.getJustifiedLayout(formatWidth);
						}

						break;
					}
					case RIGHT :
					{
						drawPosX = formatWidth - layout.getAdvance();
						break;
					}
					case CENTER :
					{
						drawPosX = (formatWidth - layout.getAdvance()) / 2;
						break;
					}
					case LEFT :
					default :
					{
						drawPosX = 0;
					}
				}

				draw(layout);
			}
			else
			{
				isMaxHeightReached = true;
			}
		}
	}
	
	/**
	 * 
	 */
	public void draw(TextLayout layout)
	{
		layout.draw(
			grx,
			drawPosX + x + leftPadding,
			drawPosY + y + topPadding + verticalOffset + leadingOffset
			);
	}
	
}