Image in mode mosaic in PdfPCell - itext

Question

I am currently using itextPdf library to generate PDF file.
For to set an image I used this solution of itextpdf.com
Now I want to set a small size image as a background in PdfPCell in mode mosaic : if cell have 3 x ImageSize, in PDF I will have my image repeated 3 times in cell
How I can do it ?
this is my example
public class ImageBackgroundEvent implements PdfPCellEvent {
protected Image image;
protected boolean mosaic;
protected boolean full;
public ImageBackgroundEvent(Image image, boolean mosaic, boolean full) {
this.image = image;
this.mosaic = mosaic;
this.full = full;
}
public void cellLayout(PdfPCell cell, Rectangle position,
PdfContentByte[] canvases) {
try {
PdfContentByte cb = canvases[PdfPTable.BACKGROUNDCANVAS];
if(full){
cell.setImage(image);
}
else if(mosaic){
float imgWidth = image.getWidth();
float imgHeight = image.getHeight();
float cellWidth = cell.getWidth();
float cellHeight = cell.getHeight();
if(imgHeight < cellHeight && imgWidth < cellWidth){
PdfPatternPainter pattern = cb.createPattern(imgWidth, imgHeight);
pattern.addImage(image);
pattern.setPatternMatrix(-0.5f, 0f, 0f, 0.5f, 0f, 0f);
cb.setPatternFill(pattern);
//cb.ellipse(180, 408, 450, 534);
cb.fillStroke();
} else{
image.scaleAbsolute(position);
image.setAbsolutePosition(position.getLeft(), position.getBottom());
cb.addImage(image);
}
} else{
image.scaleAbsolute(position);
image.setAbsolutePosition(position.getLeft(), position.getBottom());
cb.addImage(image);
}
} catch (DocumentException e) {
throw new ExceptionConverter(e);
}
}
}

Answer 1

Please take a look at the TiledBackgroundColor example. It takes an image of a light bulb and uses it to define a pattern color:
PdfContentByte canvas = writer.getDirectContent();
Image image = Image.getInstance(IMG);
PdfPatternPainter img_pattern = canvas.createPattern(
image.getScaledWidth(), image.getScaledHeight());
image.setAbsolutePosition(0, 0);
img_pattern.addImage(image);
BaseColor color = new PatternColor(img_pattern);
Now you can use that color for the background of your cell:
PdfPCell cell = new PdfPCell();
cell.setFixedHeight(60);
cell.setBackgroundColor(color);
table.addCell(cell);
The result looks like this: tiled_patterncolor.pdf
Or you could add the image in a cell event as shown in the TiledBackground example. This example was written in answer to the question iTextSharp. Why cell background image is rotated 90 degrees clockwise?
I've written a variation on this example: TiledBackgroundColor2
The event looks like this:
class TiledImageBackground implements PdfPCellEvent {
protected Image image;
public TiledImageBackground(Image image) {
this.image = image;
}
public void cellLayout(PdfPCell cell, Rectangle position,
PdfContentByte[] canvases) {
try {
PdfContentByte cb = canvases[PdfPTable.BACKGROUNDCANVAS];
image.scaleToFit(10000000, position.getHeight());
float x = position.getLeft();
float y = position.getBottom();
while (x + image.getScaledWidth() < position.getRight()) {
image.setAbsolutePosition(x, y);
cb.addImage(image);
x += image.getScaledWidth();
}
} catch (DocumentException e) {
throw new ExceptionConverter(e);
}
}
}
As you see, I don't care about the actual dimensions of the image. I scale the image in such a way that it fits the height of the cell. I don't use a pattern color either. I just add the image as many time as it fits the width of the cell.
This is how I declare the event to the cell:
PdfPCell cell = new PdfPCell();
Image image = Image.getInstance(IMG);
cell.setCellEvent(new TiledImageBackground(image));
The result looks like this:
Many variations are possible depending on your exact requirement.