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POGetting the "native size" of an image created with JLabel
 

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  1. POGetting the "native size" of an image created with JLabel
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    <p><a href="https://stackoverflow.com/a/4437998/11236">I am using JLabel</a> to create an image file from a string.</p> <p>I have to specify an image dimensions (<code>label.setSize(width, height)</code>), otherwise I get an exception:</p> <pre><code>java.lang.IllegalArgumentException: Width (0) and height (0) cannot be &lt;= 0 at java.awt.image.DirectColorModel.createCompatibleWritableRaster(DirectColorModel.java:1016) at java.awt.image.BufferedImage.&lt;init&gt;(BufferedImage.java:338) at com.shopsnips.portal.services.ImageCreator.createFromText(ImageCreator.java:31) at com.shopsnips.portal.services.ImageCreator.main(ImageCreator.java:18) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120) </code></pre> <p>I can control the font size using </p> <pre><code>label.setFont(new Font("Serif", Font.BOLD, 26)); </code></pre> <p>When I use a font or text that is too large to fit the fixed dimentions, the label is truncated and "..." is included instead. Is there a way to identify the optimal/maximal font size that still fits in the dimensions I set?</p> <p>Or alternatively, how can I find out whether the current settings (font size + dimensions) will cause the text to be truncated?</p> <p>Here is some source:</p> <pre><code>import javax.imageio.ImageIO; import javax.swing.*; import java.awt.*; import java.awt.image.BufferedImage; import java.io.IOException; import java.nio.file.Path; import java.nio.file.Paths; public class ImageCreator { private ImageCreator(){} private final static String FONT = "Freestyle Script"; public static void main(String[] args) { Path outputFile = Paths.get("c:\\tmp\\img\\test.png"); createFromText("Hello World - this is a long text", outputFile, 150, 50); } /** * &lt;p&gt;Create an image from text. &lt;p/&gt; * &lt;p/&gt; * https://stackoverflow.com/a/4437998/11236 */ public static void createFromText(String text, Path outputFile, int width, int height) { JLabel label = new JLabel(text, SwingConstants.CENTER); label.setSize(width, height); label.setFont(new Font(FONT, Font.BOLD, 24)); BufferedImage image = new BufferedImage( label.getWidth(), label.getHeight(), BufferedImage.TYPE_INT_ARGB); Graphics g = null; try { // paint the html to an image g = image.getGraphics(); g.setColor(Color.BLACK); label.paint(g); } finally { if (g != null) { g.dispose(); } } // get the byte array of the image (as jpeg) try { ImageIO.write(image, "png", outputFile.toFile()); } catch (IOException e) { throw new RuntimeException(e); } } } </code></pre> <p>Please log in to comment. </p>
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