Example usage for java.awt Graphics2D drawRenderedImage

Introduction

In this page you can find the example usage for java.awt Graphics2D drawRenderedImage.

Prototype

public abstract void drawRenderedImage(RenderedImage img, AffineTransform xform);

Source Link

Document

Renders a RenderedImage , applying a transform from image space into user space before drawing.

Usage

From source file:se.vgregion.webbisar.svc.impl.ImageUtil.java

/**
 * Resizes and overwrites the image. Will keep the original pictures dimensions.
 * //  ww w.j av  a 2 s  .  c  om
 * @param sourceFile
 *            the file to rezise
 * @param newLongSideSize
 *            the new size, in pixels.
 * @param quality
 *            a number between 0 and 100 where 100 gives the best quality
 * @throws IOException
 */
public synchronized static void scaleImage(File sourceFile, ImageSize imageSize, float quality)
        throws IOException {
    // System.gc();
    BufferedImage sourceImage = ImageIO.read(sourceFile);
    int srcWidth = sourceImage.getWidth();
    int srcHeight = sourceImage.getHeight();

    double longSideForSource = Math.max(srcWidth, srcHeight);
    double longSideForDest = srcWidth > srcHeight ? imageSize.getWidth() : imageSize.getHeight();
    double multiplier = longSideForDest / longSideForSource;

    int destWidth = (int) (srcWidth * multiplier);
    int destHeight = (int) (srcHeight * multiplier);

    BufferedImage destImage = new BufferedImage((int) imageSize.getWidth(), (int) imageSize.getHeight(),
            BufferedImage.TYPE_INT_RGB);

    Graphics2D graphics = destImage.createGraphics();
    graphics.setPaint(Color.WHITE);
    graphics.fillRect(0, 0, destImage.getWidth(), destImage.getHeight());

    AffineTransform affineTransform = AffineTransform.getScaleInstance(multiplier, multiplier);
    AffineTransform trans = new AffineTransform();
    trans.setToTranslation((imageSize.getWidth() - destWidth) / 2, (imageSize.getHeight() - destHeight) / 2);
    graphics.transform(trans);

    graphics.drawRenderedImage(sourceImage, affineTransform);
    saveImageAsJPEG(sourceFile.getAbsolutePath(), destImage, quality);

}