src/scratchpad/src/org/apache/poi/hslf/model/TextPainter.java - poi - Git at Google

 /* ====================================================================
    Licensed to the Apache Software Foundation (ASF) under one or more
    contributor license agreements.  See the NOTICE file distributed with
    this work for additional information regarding copyright ownership.
    The ASF licenses this file to You under the Apache License, Version 2.0
    (the "License"); you may not use this file except in compliance with
    the License.  You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
 ==================================================================== */
 package org.apache.poi.hslf.model;

 import org.apache.poi.hslf.usermodel.RichTextRun;
 import org.apache.poi.util.POILogger;
 import org.apache.poi.util.POILogFactory;

 import java.text.AttributedString;
 import java.text.AttributedCharacterIterator;
 import java.awt.font.TextAttribute;
 import java.awt.font.LineBreakMeasurer;
 import java.awt.font.TextLayout;
 import java.awt.*;
 import java.awt.geom.Rectangle2D;
 import java.awt.geom.Point2D;
 import java.util.ArrayList;

 /**
  * Paint text into java.awt.Graphics2D
  *
  * @author Yegor Kozlov
  */
 public class TextPainter {
     protected POILogger logger = POILogFactory.getLogger(this.getClass());

     protected TextShape _shape;

     public TextPainter(TextShape shape){
         _shape = shape;
     }

     /**
      * Convert the underlying set of rich text runs into java.text.AttributedString
      */
     public AttributedString getAttributedString(TextRun txrun){
         String text = txrun.getText();
         AttributedString at = new AttributedString(text);
         RichTextRun[] rt = txrun.getRichTextRuns();
         for (int i = 0; i < rt.length; i++) {
             int start = rt[i].getStartIndex();
             int end = rt[i].getEndIndex();
             if(start == end) continue;

             at.addAttribute(TextAttribute.FAMILY, rt[i].getFontName(), start, end);
             at.addAttribute(TextAttribute.SIZE, new Float(rt[i].getFontSize()), start, end);
             at.addAttribute(TextAttribute.FOREGROUND, rt[i].getFontColor(), start, end);
             if(rt[i].isBold()) at.addAttribute(TextAttribute.WEIGHT, TextAttribute.WEIGHT_BOLD, start, end);
             if(rt[i].isItalic()) at.addAttribute(TextAttribute.POSTURE, TextAttribute.POSTURE_OBLIQUE, start, end);
             if(rt[i].isUnderlined()) {
                 at.addAttribute(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON, start, end);
                 at.addAttribute(TextAttribute.INPUT_METHOD_UNDERLINE, TextAttribute.UNDERLINE_LOW_TWO_PIXEL, start, end);
             }
             if(rt[i].isStrikethrough()) at.addAttribute(TextAttribute.STRIKETHROUGH, TextAttribute.STRIKETHROUGH_ON, start, end);
             int superScript = rt[i].getSuperscript();
             if(superScript != 0) at.addAttribute(TextAttribute.SUPERSCRIPT, superScript > 0 ? TextAttribute.SUPERSCRIPT_SUPER : TextAttribute.SUPERSCRIPT_SUB, start, end);

         }
         return at;
     }

     public void paint(Graphics2D graphics){
         TextRun run = _shape.getTextRun();
         if (run == null) return;

         String text = run.getText();
         if (text == null || text.equals("")) return;

         AttributedString at = getAttributedString(run);

         AttributedCharacterIterator it = at.getIterator();
         int paragraphStart = it.getBeginIndex();
         int paragraphEnd = it.getEndIndex();

         Rectangle2D anchor = _shape.getAnchor2D();

         float textHeight = 0;
         ArrayList lines = new ArrayList();
         LineBreakMeasurer measurer = new LineBreakMeasurer(it, graphics.getFontRenderContext());
         measurer.setPosition(paragraphStart);
         while (measurer.getPosition() < paragraphEnd) {
             int startIndex = measurer.getPosition();
             int nextBreak = text.indexOf('\n', measurer.getPosition() + 1);

             boolean prStart = text.charAt(startIndex) == '\n';
             if(prStart) measurer.setPosition(startIndex++);

             RichTextRun rt = run.getRichTextRunAt(startIndex == text.length() ? (startIndex-1) : startIndex);
             if(rt == null) {
                 logger.log(POILogger.WARN,  "RichTextRun not found at pos" + startIndex + "; text.length: " + text.length());
                 break;
             }

             float wrappingWidth = (float)anchor.getWidth() - _shape.getMarginLeft() - _shape.getMarginRight();
             wrappingWidth -= rt.getTextOffset();

             if (_shape.getWordWrap() == TextShape.WrapNone) {
                 wrappingWidth = _shape.getSheet().getSlideShow().getPageSize().width;
             }

             TextLayout textLayout = measurer.nextLayout(wrappingWidth + 1,
                     nextBreak == -1 ? paragraphEnd : nextBreak, true);
             if (textLayout == null) {
                 textLayout = measurer.nextLayout(wrappingWidth,
                     nextBreak == -1 ? paragraphEnd : nextBreak, false);
             }
             if(textLayout == null){
                 logger.log(POILogger.WARN, "Failed to break text into lines: wrappingWidth: "+wrappingWidth+
                         "; text: " + rt.getText());
                 measurer.setPosition(rt.getEndIndex());
                 continue;
             }
             int endIndex = measurer.getPosition();

             float lineHeight = (float)textLayout.getBounds().getHeight();
             int linespacing = rt.getLineSpacing();
             if(linespacing == 0) linespacing = 100;

             TextElement el = new TextElement();
             if(linespacing >= 0){
                 el.ascent = textLayout.getAscent()*linespacing/100;
             } else {
                 el.ascent = -linespacing*Shape.POINT_DPI/Shape.MASTER_DPI;
             }

             el._align = rt.getAlignment();
             el._text = textLayout;
             el._textOffset = rt.getTextOffset();

             if (prStart){
                 int sp = rt.getSpaceBefore();
                 float spaceBefore;
                 if(sp >= 0){
                     spaceBefore = lineHeight * sp/100;
                 } else {
                     spaceBefore = -sp*Shape.POINT_DPI/Shape.MASTER_DPI;
                 }
                 el.ascent += spaceBefore;
             }

             float descent;
             if(linespacing >= 0){
                 descent = (textLayout.getDescent() + textLayout.getLeading())*linespacing/100;
             } else {
                 descent = -linespacing*Shape.POINT_DPI/Shape.MASTER_DPI;
             }
             if (prStart){
                 int sp = rt.getSpaceAfter();
                 float spaceAfter;
                 if(sp >= 0){
                     spaceAfter = lineHeight * sp/100;
                 } else {
                     spaceAfter = -sp*Shape.POINT_DPI/Shape.MASTER_DPI;
                 }
                 el.ascent += spaceAfter;
             }
             el.descent = descent;

             textHeight += el.ascent + el.descent;

             if(rt.isBullet() && (prStart || startIndex == 0)){
                 it.setIndex(startIndex);

                 AttributedString bat = new AttributedString(Character.toString(rt.getBulletChar()), it.getAttributes());
                 Color clr = rt.getBulletColor();
                 if (clr != null) bat.addAttribute(TextAttribute.FOREGROUND, clr);

                 TextLayout bulletLayout = new TextLayout(bat.getIterator(), graphics.getFontRenderContext());
                 if(text.substring(startIndex, endIndex).length() > 1){
                     el._bullet = bulletLayout;
                     el._bulletOffset = rt.getBulletOffset();
                 }
             }
             lines.add(el);
         }

         int valign = _shape.getVerticalAlignment();
         double y0 = anchor.getY();
         switch (valign){
             case TextShape.AnchorTopBaseline:
             case TextShape.AnchorTop:
                 y0 += _shape.getMarginTop();
                 break;
             case TextShape.AnchorBottom:
                 y0 += anchor.getHeight() - textHeight - _shape.getMarginBottom();
                 break;
             default:
             case TextShape.AnchorMiddle:
                 float delta =  (float)anchor.getHeight() - textHeight - _shape.getMarginTop() - _shape.getMarginBottom();
                 y0 += _shape.getMarginTop()  + delta/2;
                 break;
         }

         //finally draw the text fragments
         for (int i = 0; i < lines.size(); i++) {
             TextElement elem = (TextElement)lines.get(i);
             y0 += elem.ascent;

             Point2D.Double pen = new Point2D.Double();
             pen.y = y0;
             switch (elem._align) {
                 default:
                 case TextShape.AlignLeft:
                     pen.x = anchor.getX() + _shape.getMarginLeft();
                     break;
                 case TextShape.AlignCenter:
                     pen.x = anchor.getX() + _shape.getMarginLeft() +
                             (anchor.getWidth() - elem._text.getAdvance() - _shape.getMarginLeft() - _shape.getMarginRight()) / 2;
                     break;
                 case TextShape.AlignRight:
                     pen.x = anchor.getX() + _shape.getMarginLeft() +
                             (anchor.getWidth() - elem._text.getAdvance() - _shape.getMarginLeft() - _shape.getMarginRight());
                     break;
             }
             if(elem._bullet != null){
                 elem._bullet.draw(graphics, (float)(pen.x + elem._bulletOffset), (float)pen.y);
             }
             elem._text.draw(graphics, (float)(pen.x + elem._textOffset), (float)pen.y);

             y0 += elem.descent;
         }
     }


     static class TextElement {
         public TextLayout _text;
         public int _textOffset;
         public TextLayout _bullet;
         public int _bulletOffset;
         public int _align;
         public float ascent, descent;
     }
 }
	/* ====================================================================
	Licensed to the Apache Software Foundation (ASF) under one or more
	contributor license agreements. See the NOTICE file distributed with
	this work for additional information regarding copyright ownership.
	The ASF licenses this file to You under the Apache License, Version 2.0
	(the "License"); you may not use this file except in compliance with
	the License. You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License.
	==================================================================== */
	package org.apache.poi.hslf.model;

	import org.apache.poi.hslf.usermodel.RichTextRun;
	import org.apache.poi.util.POILogger;
	import org.apache.poi.util.POILogFactory;

	import java.text.AttributedString;
	import java.text.AttributedCharacterIterator;
	import java.awt.font.TextAttribute;
	import java.awt.font.LineBreakMeasurer;
	import java.awt.font.TextLayout;
	import java.awt.*;
	import java.awt.geom.Rectangle2D;
	import java.awt.geom.Point2D;
	import java.util.ArrayList;

	/**
	* Paint text into java.awt.Graphics2D
	*
	* @author Yegor Kozlov
	*/
	public class TextPainter {
	protected POILogger logger = POILogFactory.getLogger(this.getClass());

	protected TextShape _shape;

	public TextPainter(TextShape shape){
	_shape = shape;
	}

	/**
	* Convert the underlying set of rich text runs into java.text.AttributedString
	*/
	public AttributedString getAttributedString(TextRun txrun){
	String text = txrun.getText();
	AttributedString at = new AttributedString(text);
	RichTextRun[] rt = txrun.getRichTextRuns();
	for (int i = 0; i < rt.length; i++) {
	int start = rt[i].getStartIndex();
	int end = rt[i].getEndIndex();
	if(start == end) continue;

	at.addAttribute(TextAttribute.FAMILY, rt[i].getFontName(), start, end);
	at.addAttribute(TextAttribute.SIZE, new Float(rt[i].getFontSize()), start, end);
	at.addAttribute(TextAttribute.FOREGROUND, rt[i].getFontColor(), start, end);
	if(rt[i].isBold()) at.addAttribute(TextAttribute.WEIGHT, TextAttribute.WEIGHT_BOLD, start, end);
	if(rt[i].isItalic()) at.addAttribute(TextAttribute.POSTURE, TextAttribute.POSTURE_OBLIQUE, start, end);
	if(rt[i].isUnderlined()) {
	at.addAttribute(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON, start, end);
	at.addAttribute(TextAttribute.INPUT_METHOD_UNDERLINE, TextAttribute.UNDERLINE_LOW_TWO_PIXEL, start, end);
	}
	if(rt[i].isStrikethrough()) at.addAttribute(TextAttribute.STRIKETHROUGH, TextAttribute.STRIKETHROUGH_ON, start, end);
	int superScript = rt[i].getSuperscript();
	if(superScript != 0) at.addAttribute(TextAttribute.SUPERSCRIPT, superScript > 0 ? TextAttribute.SUPERSCRIPT_SUPER : TextAttribute.SUPERSCRIPT_SUB, start, end);

	}
	return at;
	}

	public void paint(Graphics2D graphics){
	TextRun run = _shape.getTextRun();
	if (run == null) return;

	String text = run.getText();
	if (text == null \|\| text.equals("")) return;

	AttributedString at = getAttributedString(run);

	AttributedCharacterIterator it = at.getIterator();
	int paragraphStart = it.getBeginIndex();
	int paragraphEnd = it.getEndIndex();

	Rectangle2D anchor = _shape.getAnchor2D();

	float textHeight = 0;
	ArrayList lines = new ArrayList();
	LineBreakMeasurer measurer = new LineBreakMeasurer(it, graphics.getFontRenderContext());
	measurer.setPosition(paragraphStart);
	while (measurer.getPosition() < paragraphEnd) {
	int startIndex = measurer.getPosition();
	int nextBreak = text.indexOf('\n', measurer.getPosition() + 1);

	boolean prStart = text.charAt(startIndex) == '\n';
	if(prStart) measurer.setPosition(startIndex++);

	RichTextRun rt = run.getRichTextRunAt(startIndex == text.length() ? (startIndex-1) : startIndex);
	if(rt == null) {
	logger.log(POILogger.WARN, "RichTextRun not found at pos" + startIndex + "; text.length: " + text.length());
	break;
	}

	float wrappingWidth = (float)anchor.getWidth() - _shape.getMarginLeft() - _shape.getMarginRight();
	wrappingWidth -= rt.getTextOffset();

	if (_shape.getWordWrap() == TextShape.WrapNone) {
	wrappingWidth = _shape.getSheet().getSlideShow().getPageSize().width;
	}

	TextLayout textLayout = measurer.nextLayout(wrappingWidth + 1,
	nextBreak == -1 ? paragraphEnd : nextBreak, true);
	if (textLayout == null) {
	textLayout = measurer.nextLayout(wrappingWidth,
	nextBreak == -1 ? paragraphEnd : nextBreak, false);
	}
	if(textLayout == null){
	logger.log(POILogger.WARN, "Failed to break text into lines: wrappingWidth: "+wrappingWidth+
	"; text: " + rt.getText());
	measurer.setPosition(rt.getEndIndex());
	continue;
	}
	int endIndex = measurer.getPosition();

	float lineHeight = (float)textLayout.getBounds().getHeight();
	int linespacing = rt.getLineSpacing();
	if(linespacing == 0) linespacing = 100;

	TextElement el = new TextElement();
	if(linespacing >= 0){
	el.ascent = textLayout.getAscent()*linespacing/100;
	} else {
	el.ascent = -linespacing*Shape.POINT_DPI/Shape.MASTER_DPI;
	}

	el._align = rt.getAlignment();
	el._text = textLayout;
	el._textOffset = rt.getTextOffset();

	if (prStart){
	int sp = rt.getSpaceBefore();
	float spaceBefore;
	if(sp >= 0){
	spaceBefore = lineHeight * sp/100;
	} else {
	spaceBefore = -sp*Shape.POINT_DPI/Shape.MASTER_DPI;
	}
	el.ascent += spaceBefore;
	}

	float descent;
	if(linespacing >= 0){
	descent = (textLayout.getDescent() + textLayout.getLeading())*linespacing/100;
	} else {
	descent = -linespacing*Shape.POINT_DPI/Shape.MASTER_DPI;
	}
	if (prStart){
	int sp = rt.getSpaceAfter();
	float spaceAfter;
	if(sp >= 0){
	spaceAfter = lineHeight * sp/100;
	} else {
	spaceAfter = -sp*Shape.POINT_DPI/Shape.MASTER_DPI;
	}
	el.ascent += spaceAfter;
	}
	el.descent = descent;

	textHeight += el.ascent + el.descent;

	if(rt.isBullet() && (prStart \|\| startIndex == 0)){
	it.setIndex(startIndex);

	AttributedString bat = new AttributedString(Character.toString(rt.getBulletChar()), it.getAttributes());
	Color clr = rt.getBulletColor();
	if (clr != null) bat.addAttribute(TextAttribute.FOREGROUND, clr);

	TextLayout bulletLayout = new TextLayout(bat.getIterator(), graphics.getFontRenderContext());
	if(text.substring(startIndex, endIndex).length() > 1){
	el._bullet = bulletLayout;
	el._bulletOffset = rt.getBulletOffset();
	}
	}
	lines.add(el);
	}

	int valign = _shape.getVerticalAlignment();
	double y0 = anchor.getY();
	switch (valign){
	case TextShape.AnchorTopBaseline:
	case TextShape.AnchorTop:
	y0 += _shape.getMarginTop();
	break;
	case TextShape.AnchorBottom:
	y0 += anchor.getHeight() - textHeight - _shape.getMarginBottom();
	break;
	default:
	case TextShape.AnchorMiddle:
	float delta = (float)anchor.getHeight() - textHeight - _shape.getMarginTop() - _shape.getMarginBottom();
	y0 += _shape.getMarginTop() + delta/2;
	break;
	}

	//finally draw the text fragments
	for (int i = 0; i < lines.size(); i++) {
	TextElement elem = (TextElement)lines.get(i);
	y0 += elem.ascent;

	Point2D.Double pen = new Point2D.Double();
	pen.y = y0;
	switch (elem._align) {
	default:
	case TextShape.AlignLeft:
	pen.x = anchor.getX() + _shape.getMarginLeft();
	break;
	case TextShape.AlignCenter:
	pen.x = anchor.getX() + _shape.getMarginLeft() +
	(anchor.getWidth() - elem._text.getAdvance() - _shape.getMarginLeft() - _shape.getMarginRight()) / 2;
	break;
	case TextShape.AlignRight:
	pen.x = anchor.getX() + _shape.getMarginLeft() +
	(anchor.getWidth() - elem._text.getAdvance() - _shape.getMarginLeft() - _shape.getMarginRight());
	break;
	}
	if(elem._bullet != null){
	elem._bullet.draw(graphics, (float)(pen.x + elem._bulletOffset), (float)pen.y);
	}
	elem._text.draw(graphics, (float)(pen.x + elem._textOffset), (float)pen.y);

	y0 += elem.descent;
	}
	}


	static class TextElement {
	public TextLayout _text;
	public int _textOffset;
	public TextLayout _bullet;
	public int _bulletOffset;
	public int _align;
	public float ascent, descent;
	}
	}