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Add DPI setter

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Signed-off-by: Rahul Rudragoudar <rr83019@gmail.com>
This commit is contained in:
Rahul Rudragoudar 2021-08-31 15:42:57 +05:30
parent 1a41724fdc
commit d30249a89f
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2 changed files with 74 additions and 6 deletions
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69
src/main/java/lc/misc/DPISetter.java Normal file
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@ -0,0 +1,69 @@
package lc.misc;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Iterator;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.metadata.IIOInvalidTreeException;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.metadata.IIOMetadataNode;
import javax.imageio.stream.ImageOutputStream;
import java.awt.image.BufferedImage;
public class DPISetter {
final int DPI = 245;
final double INCH_2_CM = 2.54;
public void setDPI(ByteArrayOutputStream boas, BufferedImage gridImage) throws IOException {
final String formatName = "png";
for (Iterator<ImageWriter> iw = ImageIO.getImageWritersByFormatName(formatName);
iw.hasNext(); ) {
ImageWriter writer = iw.next();
ImageWriteParam writeParam = writer.getDefaultWriteParam();
ImageTypeSpecifier typeSpecifier = ImageTypeSpecifier.createFromBufferedImageType(BufferedImage.TYPE_INT_RGB);
IIOMetadata metadata = writer.getDefaultImageMetadata(typeSpecifier, writeParam);
if (metadata.isReadOnly() || !metadata.isStandardMetadataFormatSupported()) {
continue;
}
setDPIMeta(metadata);
final ImageOutputStream stream = ImageIO.createImageOutputStream(boas);
try {
writer.setOutput(stream);
writer.write(metadata, new IIOImage(gridImage, null, metadata), writeParam);
} finally {
stream.close();
}
break;
}
}
public void setDPIMeta(IIOMetadata metadata) throws IIOInvalidTreeException {
// for PNG, it's dots per millimeter
double dotsPerMilli = 1.0 * DPI / 10 / INCH_2_CM;
System.out.println(dotsPerMilli);
IIOMetadataNode horiz = new IIOMetadataNode("HorizontalPixelSize");
horiz.setAttribute("value", Double.toString(dotsPerMilli));
IIOMetadataNode vert = new IIOMetadataNode("VerticalPixelSize");
vert.setAttribute("value", Double.toString(dotsPerMilli));
IIOMetadataNode dim = new IIOMetadataNode("Dimension");
dim.appendChild(horiz);
dim.appendChild(vert);
IIOMetadataNode root = new IIOMetadataNode("javax_imageio_1.0");
root.appendChild(dim);
metadata.mergeTree("javax_imageio_1.0", root);
}
}

11
src/main/java/lc/misc/HelperFunctions.java
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@ -7,9 +7,9 @@ public class HelperFunctions {
private static Random random = new Random(); private static Random random = new Random();
synchronized public static void setSeed(long seed){ public static synchronized void setSeed(long seed) {
random.setSeed(seed); random.setSeed(seed);
} }
public static void setRenderingHints(Graphics2D g2d) { public static void setRenderingHints(Graphics2D g2d) {
g2d.setRenderingHint( g2d.setRenderingHint(
@ -38,12 +38,11 @@ public class HelperFunctions {
return stringBuilder.toString(); return stringBuilder.toString();
} }
synchronized public static int randomNumber(int min, int max) { public static synchronized int randomNumber(int min, int max) {
return random.nextInt((max - min) + 1) + min; return random.nextInt((max - min) + 1) + min;
} }
synchronized public static int randomNumber(int bound) { public static synchronized int randomNumber(int bound) {
return random.nextInt(bound); return random.nextInt(bound);
} }
} }