Renders multiple paragraphs of text in an array to an image (created and returned).
/*
*
* Created on March 16, 2007, 4:34 PM
*
* Copyright 2006-2007 Nigel Hughes
*
* Licensed 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.
*/
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsEnvironment;
import java.awt.RenderingHints;
import java.awt.Transparency;
import java.awt.font.FontRenderContext;
import java.awt.font.LineBreakMeasurer;
import java.awt.font.TextAttribute;
import java.awt.font.TextLayout;
import java.awt.image.BufferedImage;
import java.text.AttributedCharacterIterator;
import java.text.AttributedString;
import java.util.Hashtable;
import java.util.LinkedList;
/**
* @author nigel
*/
public class Utils {
/**
* Renders multiple paragraphs of text in an array to an image (created and returned).
*
* @param font The font to use
* @param textColor The color of the text
* @param text The message in an array of strings (one paragraph in each
* @param width The width the text should be limited to
* @return An image with the text rendered into it
*/
public static BufferedImage renderTextToImage(Font font, Color textColor, String text[], int width){
LinkedList<BufferedImage> images = new LinkedList<BufferedImage>();
int totalHeight = 0;
for (String paragraph : text){
BufferedImage paraImage = renderTextToImage(font,textColor,paragraph,width);
totalHeight+=paraImage.getHeight();
images.add(paraImage);
}
BufferedImage image = createCompatibleImage(width,totalHeight);
Graphics2D graphics = (Graphics2D) image.createGraphics();
int y=0;
for (BufferedImage paraImage : images){
graphics.drawImage(paraImage,0,y,null);
y+=paraImage.getHeight();
}
graphics.dispose();
return image;
}
/**
* Renders a paragraph of text (line breaks ignored) to an image (created and returned).
*
* @param font The font to use
* @param textColor The color of the text
* @param text The message
* @param width The width the text should be limited to
* @return An image with the text rendered into it
*/
public static BufferedImage renderTextToImage(Font font, Color textColor, String text, int width){
Hashtable map = new Hashtable();
map.put(TextAttribute.FONT, font);
AttributedString attributedString = new AttributedString(text,map);
AttributedCharacterIterator paragraph = attributedString.getIterator();
FontRenderContext frc = new FontRenderContext(null, false, false);
int paragraphStart = paragraph.getBeginIndex();
int paragraphEnd = paragraph.getEndIndex();
LineBreakMeasurer lineMeasurer = new LineBreakMeasurer(paragraph, frc);
float drawPosY=0;
//First time around, just determine the height
while (lineMeasurer.getPosition() < paragraphEnd) {
TextLayout layout = lineMeasurer.nextLayout(width);
// Move it down
drawPosY += layout.getAscent() + layout.getDescent() + layout.getLeading();
}
BufferedImage image = createCompatibleImage(width,(int) drawPosY);
Graphics2D graphics = (Graphics2D) image.getGraphics();
graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
drawPosY=0;
lineMeasurer.setPosition(paragraphStart);
while (lineMeasurer.getPosition() < paragraphEnd) {
TextLayout layout = lineMeasurer.nextLayout(width);
// Move y-coordinate by the ascent of the layout.
drawPosY += layout.getAscent();
/* Compute pen x position. If the paragraph is
right-to-left, we want to align the TextLayouts
to the right edge of the panel.
*/
float drawPosX;
if (layout.isLeftToRight()) {
drawPosX = 0;
} else {
drawPosX = width - layout.getAdvance();
}
// Draw the TextLayout at (drawPosX, drawPosY).
layout.draw(graphics, drawPosX, drawPosY);
// Move y-coordinate in preparation for next layout.
drawPosY += layout.getDescent() + layout.getLeading();
}
graphics.dispose();
return image;
}
/**
* Creates an image compatible with the current display
*
* @return A BufferedImage with the appropriate color model
*/
public static BufferedImage createCompatibleImage(int width, int height) {
GraphicsConfiguration configuration = GraphicsEnvironment.getLocalGraphicsEnvironment()
.getDefaultScreenDevice().getDefaultConfiguration();
return configuration.createCompatibleImage(width, height, Transparency.TRANSLUCENT);
}
}
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