| Method Signatures and Parameters | |
Jt.image(String url) | url (String) A URL for a hosted image file. |
Jt.image(byte[] data) | data (byte[]) Raw image data. |
Jt.image(java.nio.file.Path filePath) | filePath (java.nio.file.Path) A path to a local image file. The path can be absolute or relative to the working directory. |
Jt.image(JtUploadedFile uploadedFile) | uploadedFile (io.javelit.core.JtUploadedFile) An uploaded file. |
Jt.imageFromSvg(String svg) | svg (String) No description |
| Chainable builder methods | |
caption(String caption) | Image caption. If this is |
width(String width) | The width of the element. This can be one of the following:
|
width(int widthPixels) | The width of the radio group in pixels. The element will have a fixed width. If the specified width is greater than the width of the parent container, the width of the element matches the width of the parent container. |
key(String key) | A string to use as the unique key for the widget. If this is omitted, a key will be generated for the widget based on its content. No two widgets may have the same key. |
Only applies to input widgets that have a provided | |
use() | Put the widget in the app, in the |
use(JtContainer container) | Put the widget in the app, in the provided container. |
Examples
Image from external URL
import io.javelit.core.Jt;
public class UrlImageApp {
public static void main(String[] args) {
Jt.image("https://raw.githubusercontent.com/javelit/public_assets/refs/heads/main/image/mountains2.jpg").use();
}
}
Image from static resource
package staticImageApp;
import io.javelit.core.Jt;
public class StaticImageApp {
public static void main(String[] args) {
// assume static/mountains.jpg is present in the working directory
Jt.image("app/static/mountains.jpg").use();
}
}
Image from raw data
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import javax.imageio.ImageIO;
import io.javelit.core.Jt;
public class ByteImageApp {
public static void main(String[] args) throws IOException {
byte[] imageBytes = generateHexagonImage();
Jt.image(imageBytes).use();
}
private static byte[] generateHexagonImage() throws IOException {
int width = 800;
int height = 400;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = image.createGraphics();
// Enable anti-aliasing for smoother edges
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
// Light blue background
g2d.setColor(new Color(240, 248, 255));
g2d.fillRect(0, 0, width, height);
// Draw hexagon
int centerX = width / 2;
int centerY = height / 2;
int radius = 150;
int[] xPoints = new int[6];
int[] yPoints = new int[6];
for (int i = 0; i < 6; i++) {
double angle = Math.PI / 3 * i - Math.PI / 6;
xPoints[i] = centerX + (int) (radius * Math.cos(angle));
yPoints[i] = centerY + (int) (radius * Math.sin(angle));
}
// Fill hexagon with teal color
g2d.setColor(new Color(32, 178, 170));
g2d.fillPolygon(xPoints, yPoints, 6);
// Draw hexagon border
g2d.setColor(new Color(0, 128, 128));
g2d.setStroke(new BasicStroke(3));
g2d.drawPolygon(xPoints, yPoints, 6);
g2d.dispose();
// Convert to PNG bytes
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(image, "PNG", baos);
return baos.toByteArray();
}
}
Image from local file
import java.nio.file.Path;
import io.javelit.core.Jt;
public class FileImageApp {
public static void main(String[] args) {
// assumes mountains.jpg is present in the working directory
Jt.image(Path.of("mountains.jpg")).use();
}
}
From an SVG image
import io.javelit.core.Jt;
public class SvgImageApp {
public static void main(String[] args) {
String svg = """
<svg width="200" height="200" xmlns="http://www.w3.org/2000/svg">
<circle cx="100" cy="100" r="80" fill="#4CAF50" />
<path d="M 60 100 L 90 130 L 140 80" stroke="white" stroke-width="8" fill="none" stroke-linecap="round" stroke-linejoin="round"/>
</svg>
""";
Jt.imageFromSvg(svg).use();
}
}
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