org.apache.poi.sl.draw

Interface ImageRenderer

All Known Implementing Classes:

BitmapImageRenderer

public interface ImageRenderer

Classes can implement this interfaces to support other formats, for example, use Apache Batik to render WMF, PICT can be rendered using Apple QuickTime API for Java:

 
 public class MyImageRendener implements ImageRendener {
     InputStream data;

     public boolean drawImage(Graphics2D graphics,Rectangle2D anchor,Insets clip) {
         // draw image
       DataInputStream is = new DataInputStream(data);
       org.apache.batik.transcoder.wmf.tosvg.WMFRecordStore wmfStore =
               new org.apache.batik.transcoder.wmf.tosvg.WMFRecordStore();
       try {
           wmfStore.read(is);
       } catch (IOException e){
           return;
       }

       float scale = (float)anchor.width/wmfStore.getWidthPixels();

       org.apache.batik.transcoder.wmf.tosvg.WMFPainter painter =
               new org.apache.batik.transcoder.wmf.tosvg.WMFPainter(wmfStore, 0, 0, scale);
       graphics.translate(anchor.x, anchor.y);
       painter.paint(graphics);
     }

     public void loadImage(InputStream data, String contentType) throws IOException {
         if ("image/wmf".equals(contentType)) {
             this.data = data;
             // use Apache Batik to handle WMF
         } else {
             super.loadImage(data,contentType);
         }
     }
 }
 
 

and then pass this class to your instance of java.awt.Graphics2D:

 
 graphics.setRenderingHint(Drawable.IMAGE_RENDERER, new MyImageRendener());
 
 

Method Summary

Modifier and Type	Method and Description
boolean	drawImage(java.awt.Graphics2D graphics, java.awt.geom.Rectangle2D anchor) Render picture data into the supplied graphics
boolean	drawImage(java.awt.Graphics2D graphics, java.awt.geom.Rectangle2D anchor, java.awt.Insets clip) Render picture data into the supplied graphics
java.awt.Dimension	getDimension()
java.awt.image.BufferedImage	getImage()
java.awt.image.BufferedImage	getImage(java.awt.Dimension dim)
void	loadImage(byte[] data, java.lang.String contentType) Load and buffer the image
void	loadImage(java.io.InputStream data, java.lang.String contentType) Load and buffer the image
void	setAlpha(double alpha)

Method Detail

loadImage

void loadImage(java.io.InputStream data,
               java.lang.String contentType)
        throws java.io.IOException

Load and buffer the image

Parameters:

data - the raw image stream

contentType - the content type

Throws:

java.io.IOException

loadImage

void loadImage(byte[] data,
               java.lang.String contentType)
        throws java.io.IOException

Load and buffer the image

Parameters:

data - the raw image bytes

contentType - the content type

Throws:

java.io.IOException

getDimension

java.awt.Dimension getDimension()

Returns:

the dimension of the buffered image

setAlpha

void setAlpha(double alpha)

Parameters:

alpha - the alpha [0..1] to be added to the image (possibly already containing an alpha channel)

getImage

java.awt.image.BufferedImage getImage()

Returns:

the image as buffered image

getImage

java.awt.image.BufferedImage getImage(java.awt.Dimension dim)

Parameters:

dim - the dimension in pixels of the returned image

Returns:

the image as buffered image

Since:

POI 3.15-beta2

drawImage

boolean drawImage(java.awt.Graphics2D graphics,
                  java.awt.geom.Rectangle2D anchor)

Render picture data into the supplied graphics

Returns:

true if the picture data was successfully rendered

drawImage

boolean drawImage(java.awt.Graphics2D graphics,
                  java.awt.geom.Rectangle2D anchor,
                  java.awt.Insets clip)

Render picture data into the supplied graphics

Returns:

true if the picture data was successfully rendered