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[BAEL-4240] Adding Text to an Image in Java (#9642) 

* [BAEL-4240] Code Upload

* [BAEL-4240] Remove double space

* [BAEL-4240] Adapting Text to the image

* [BAEL-4240] Package rename
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sergio41 2020-07-12 12:29:36 +02:00 committed by GitHub
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commit bf1e2c09f7
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image-processing/src/main/java/com/baeldung/imageprocessing/addingtext/AddText.java Normal file
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package com.baeldung.imageprocessing.addingtext;
import ij.IJ;
import ij.ImagePlus;
import ij.process.ImageProcessor;
import java.awt.*;
import java.awt.font.GlyphVector;
import java.awt.font.TextAttribute;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.text.AttributedString;
import javax.imageio.ImageIO;
public class AddText {
public static void main(String[] args) throws IOException {
String imagePath = AddText.class.getClassLoader().getResource("lena.jpg").getPath();
ImagePlus resultPlus= signImageImageProcessor("www.baeldung.com", imagePath);
resultPlus.show();
ImagePlus resultGraphics = new ImagePlus("", signImageGraphics("www.baeldung.com", imagePath));
resultGraphics.show();
ImagePlus resultGraphicsWithIterator = new ImagePlus("", signImageGraphicsWithIterator("www.baeldung.com", imagePath));
resultGraphicsWithIterator.show();
ImagePlus resultGraphicsCentered = new ImagePlus("", signImageCenter("www.baeldung.com", imagePath));
resultGraphicsCentered.show();
ImagePlus resultGraphicsBottomRight = new ImagePlus("", signImageBottomRight("www.baeldung.com", imagePath));
resultGraphicsBottomRight.show();
ImagePlus resultGraphicsTopLeft= new ImagePlus("", signImageTopLeft("www.baeldung.com", imagePath));
resultGraphicsTopLeft.show();
ImagePlus resultGraphicsAdaptBasedOnImage= new ImagePlus("", signImageAdaptBasedOnImage("www.baeldung.com", imagePath));
resultGraphicsAdaptBasedOnImage.show();
}
private static ImagePlus signImageImageProcessor(String text, String path) {
ImagePlus image = IJ.openImage(path);
Font font = new Font("Arial", Font.BOLD, 18);
ImageProcessor ip = image.getProcessor();
ip.setColor(Color.GREEN);
ip.setFont(font);
ip.drawString(text, 0, 20);
return image;
}
private static BufferedImage signImageGraphics(String text, String path) throws IOException {
BufferedImage image = ImageIO.read(new File(path));
Font font = new Font("Arial", Font.BOLD, 18);
Graphics g = image.getGraphics();
g.setFont(font);
g.setColor(Color.GREEN);
g.drawString(text, 0, 20);
return image;
}
private static BufferedImage signImageGraphicsWithIterator(String text, String path) throws IOException {
BufferedImage image = ImageIO.read(new File(path));
Font font = new Font("Arial", Font.BOLD, 18);
AttributedString attributedText = new AttributedString(text);
attributedText.addAttribute(TextAttribute.FONT, font);
attributedText.addAttribute(TextAttribute.FOREGROUND, Color.GREEN);
Graphics g = image.getGraphics();
g.drawString(attributedText.getIterator(), 0, 20);
return image;
}
/**
* Draw a String centered in the middle of a Rectangle.
*
* @param g The Graphics instance.
* @param text The String to draw.
* @param rect The Rectangle to center the text in.
* @throws IOException
*/
public static BufferedImage signImageCenter(String text, String path) throws IOException {
BufferedImage image = ImageIO.read(new File(path));
Font font = new Font("Arial", Font.BOLD, 18);
AttributedString attributedText = new AttributedString(text);
attributedText.addAttribute(TextAttribute.FONT, font);
attributedText.addAttribute(TextAttribute.FOREGROUND, Color.GREEN);
Graphics g = image.getGraphics();
FontMetrics metrics = g.getFontMetrics(font);
int positionX = (image.getWidth() - metrics.stringWidth(text)) / 2;
int positionY = (image.getHeight() - metrics.getHeight()) / 2 + metrics.getAscent();
g.drawString(attributedText.getIterator(), positionX, positionY);
return image;
}
/**
* Draw a String centered in the middle of a Rectangle.
*
* @param g The Graphics instance.
* @param text The String to draw.
* @param rect The Rectangle to center the text in.
* @throws IOException
*/
public static BufferedImage signImageBottomRight(String text, String path) throws IOException {
BufferedImage image = ImageIO.read(new File(path));
Font font = new Font("Arial", Font.BOLD, 18);
AttributedString attributedText = new AttributedString(text);
attributedText.addAttribute(TextAttribute.FONT, font);
attributedText.addAttribute(TextAttribute.FOREGROUND, Color.GREEN);
Graphics g = image.getGraphics();
FontMetrics metrics = g.getFontMetrics(font);
int positionX = (image.getWidth() - metrics.stringWidth(text));
int positionY = (image.getHeight() - metrics.getHeight()) + metrics.getAscent();
g.drawString(attributedText.getIterator(), positionX, positionY);
return image;
}
/**
* Draw a String centered in the middle of a Rectangle.
*
* @param g The Graphics instance.
* @param text The String to draw.
* @param rect The Rectangle to center the text in.
* @throws IOException
*/
public static BufferedImage signImageTopLeft(String text, String path) throws IOException {
BufferedImage image = ImageIO.read(new File(path));
Font font = new Font("Arial", Font.BOLD, 18);
AttributedString attributedText = new AttributedString(text);
attributedText.addAttribute(TextAttribute.FONT, font);
attributedText.addAttribute(TextAttribute.FOREGROUND, Color.GREEN);
Graphics g = image.getGraphics();
FontMetrics metrics = g.getFontMetrics(font);
int positionX = 0;
int positionY = metrics.getAscent();
g.drawString(attributedText.getIterator(), positionX, positionY);
return image;
}
/**
* Draw a String centered in the middle of a Rectangle.
*
* @param g The Graphics instance.
* @param text The String to draw.
* @param rect The Rectangle to center the text in.
* @throws IOException
*/
public static BufferedImage signImageAdaptBasedOnImage(String text, String path) throws IOException {
BufferedImage image = ImageIO.read(new File(path));
Font font = createFontToFit(new Font("Arial", Font.BOLD, 80), text, image);
AttributedString attributedText = new AttributedString(text);
attributedText.addAttribute(TextAttribute.FONT, font);
attributedText.addAttribute(TextAttribute.FOREGROUND, Color.GREEN);
Graphics g = image.getGraphics();
FontMetrics metrics = g.getFontMetrics(font);
int positionX = (image.getWidth() - metrics.stringWidth(text));
int positionY = (image.getHeight() - metrics.getHeight()) + metrics.getAscent();
g.drawString(attributedText.getIterator(), positionX, positionY);
return image;
}
public static Font createFontToFit(Font baseFont, String text, BufferedImage image) throws IOException
{
Font newFont = baseFont;
FontMetrics ruler = image.getGraphics().getFontMetrics(baseFont);
GlyphVector vector = baseFont.createGlyphVector(ruler.getFontRenderContext(), text);
Shape outline = vector.getOutline(0, 0);
double expectedWidth = outline.getBounds().getWidth();
double expectedHeight = outline.getBounds().getHeight();
boolean textFits = image.getWidth() >= expectedWidth && image.getHeight() >= expectedHeight;
if(!textFits) {
double widthBasedFontSize = (baseFont.getSize2D()*image.getWidth())/expectedWidth;
double heightBasedFontSize = (baseFont.getSize2D()*image.getHeight())/expectedHeight;
double newFontSize = widthBasedFontSize < heightBasedFontSize ? widthBasedFontSize : heightBasedFontSize;
newFont = baseFont.deriveFont(baseFont.getStyle(), (float)newFontSize);
}
return newFont;
}
}