I can set the width of a new paragraph as follows, which results in a certain height:
Paragraph p = new Paragraph("some longer text some longer text some longer text");
p.setWidth(100);
System.out.println("height " + p.getHeight());
document.add(p);
Of course p.getHeight() is null, since the rendered height is calculated during rendering the PDF file. But I need the height before the final rendering. How can I get it most efficiently?
To get the effective width of the paragraph as if it was drawn on a page already, you need to create renderer tree from model element tree, and then layout the topmost renderer. This is how it's done in code:
Paragraph p = new Paragraph("some longer text some longer text some longer text");
p.setWidth(100);
// Create renderer tree
IRenderer paragraphRenderer = p.createRendererSubTree();
// Do not forget setParent(). Set the dimensions of the viewport as needed
LayoutResult result = paragraphRenderer.setParent(document.getRenderer()).
layout(new LayoutContext(new LayoutArea(1, new Rectangle(100, 1000))));
// LayoutResult#getOccupiedArea() contains the information you need
System.out.println("height " + result.getOccupiedArea().getBBox().getHeight());
Please note that the computed dimensions will also include margins (present in a paragraph by default), so if you want to get the height without margins you should first set paragraph margin to 0:
p.setMargin(0);
Related
I'm trying to set up a page where the text fills up in a text box and then overflows to another text box on the page. I set up a rectangle and will send it the text, but I can't figure out how to find the text that won't fit.
I remember seeing a function that adds words to a document (or table or something) and it had a "Returns remaining text" feature. I can't find that function anymore.
How can I get the text that won't fit returned so I can assign it to a variable to send to the next textbox?
You are looking for ColumnText which can be used to render text inside a defined shape. The go() method returns the constants NO_MORE_TEXT (1) if the text fit inside the shape or NO_MORE_COLUMN (2) if the text is overflowing. As far as I know there is no way to actually get the remaining text directly. However, you don't need the text for rendering it in the next textbox.
In case the text overflows, you can just assign a new column and call go() again. Repeat this process until all the text has been drawn.
Here is an example with 3 simple rectangular boxes:
Document document = new Document(PageSize.A4);
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("overflow.pdf"));
document.open();
// define text
PdfContentByte canvas = writer.getDirectContent();
ColumnText ct = new ColumnText(canvas);
ct.addElement(new Paragraph(LOREM_IPSUM)); // <- some filler text from constant
// fill first box
ct.setSimpleColumn(50, 735, 400, 800);
int result = ct.go();
// fill second box (if necessary)
if (result == ColumnText.NO_MORE_COLUMN) {
ct.setSimpleColumn(75, 635, 425, 700);
result = ct.go();
}
// fill third box (if necessary)
if (result == ColumnText.NO_MORE_COLUMN) {
ct.setSimpleColumn(100, 535, 450, 600);
result = ct.go();
}
document.close();
Result:
I need to know the width (in point) of a Paragraph before add to the document. I searched here and found Alexey answer about Paragraph's height. So I made it with width, but it doesn't work. Always return the Rectangle's width no matter how long the Paragraph.
I tried this code:
private float getRealParagraphWidth(Document doc, Paragraph paragraph) {
// Create renderer tree
IRenderer paragraphRenderer = paragraph.createRendererSubTree();
// Do not forget setParent(). Set the dimensions of the viewport as needed
LayoutResult result = paragraphRenderer.setParent(doc.getRenderer()).
layout(new LayoutContext(new LayoutArea(1, new Rectangle(1000, 100))));
// LayoutResult#getOccupiedArea() contains the information you need
return result.getOccupiedArea().getBBox().getWidth();
}
So, my question is, what is wrong with this code if it works with height, but not with width?
A friend of mine solved it. The last line of the code should be this one:
private float getRealParagraphWidth(Document doc, Paragraph paragraph) {
// Create renderer tree
IRenderer paragraphRenderer = paragraph.createRendererSubTree();
// Do not forget setParent(). Set the dimensions of the viewport as needed
LayoutResult result = paragraphRenderer.setParent(doc.getRenderer()).
layout(new LayoutContext(new LayoutArea(1, new Rectangle(1000, 100))));
// LayoutResult#getOccupiedArea() contains the information you need
//return result.getOccupiedArea().getBBox().getWidth();
return ((ParagraphRenderer) paragraphRenderer).getMinMaxWidth().getMaxWidth();
}
It result the correct value.
I am trying to add footer to my existing PDF. I did add one footer to the PDF.
Is there anyway to add 2 lines of footer? This is my code below:
Document document = new Document();
PdfCopy copy = new PdfCopy(document, new FileOutputStream(new File("D:/TestDestination/Merge Output1.pdf")));
document.open();
PdfReader reader1 = new PdfReader("D:/TestDestination/Merge Output.pdf");
int n1 = reader1.getNumberOfPages();
PdfImportedPage page;
PdfCopy.PageStamp stamp;
Font ffont = new Font(Font.FontFamily.UNDEFINED, 5, Font.ITALIC);
for (int i = 0; i < n1; ) {
page = copy.getImportedPage(reader1, ++i);
stamp = copy.createPageStamp(page);
ColumnText.showTextAligned(stamp.getUnderContent(), Element.ALIGN_CENTER,new Phrase(String.format("page %d of %d", i, n1)),297.5f, 28, 0);
stamp.alterContents();
copy.addPage(page);
}
document.close();
reader1.close();
Please go to the official documentation and click Q&A to go to the Frequently Asked Questions. Select Absolute positioning of text.
You are currently using ColumnText in a way that allows you to add a single line of text. You are using ColumnText.showTextAligned(...) as explained in my answer to the question How to rotate a single line of text?
You should read the answers to questions such as:
How to add text at an absolute position on the top of the first page?
How to add text inside a rectangle?
How to truncate text within a bounding box?
How to fit a String inside a rectangle?
How to reduce redundant code when adding content at absolute positions?
Assuming that you don't have access to the official web site (otherwise you wouldn't have posted your question), I'm adding a short code snippet:
ColumnText ct = new ColumnText(stamp.getUnderContent());
ct.setSimpleColumn(rectangle);
ct.addElement(new Paragraph("Whatever text needs to fit inside the rectangle"));
ct.go();
In this snippet, stamp is the object you created in your code. The rectangle object is of type Rectangle. Its parameters are the coordinates of the lower-left and upper-right corner of the rectangle in which you want to render the multi-line text.
Caveat: all text that doesn't fit the rectangle will be dropped. You can avoid this by adding the text in simulation mode first. If the text fits, add it for real. If it doesn't fit, try anew using a smaller font or a bigger rectangle.
In my project I use iText to generate a PDF document.
Suppose that the height of a page measures 500pt (1 user unit = 1 point), and that I write some text to the page, followed by an image.
If the content and the image require less than 450pt, the text preceded the image.
If the content and the image exceed 450pt, the text is forwarded to the next page.
My question is: how can I obtain the remaining available space before writing an image?
First things first: when adding text and images to a page, iText sometimes changes the order of the textual content and the image. You can avoid this by using:
writer.setStrictImageSequence(true);
If you want to know the current position of the "cursor", you can use the method getVerticalPosition(). Unfortunately, this method isn't very elegant: it requires a Boolean parameter that will add a newline (if true) or give you the position at the current line (if false).
I do not understand why you want to get the vertical position. Is it because you want to have a caption followed by an image, and you want the caption and the image to be at the same page?
In that case, you could put your text and images inside a table cell and instruct iText not to split rows. In this case, iText will forward both text and image, in the correct order to the next page if the content doesn't fit the current page.
Update:
Based on the extra information added in the comments, it is now clear that the OP wants to add images that are watermarked.
There are two approaches to achieve this, depending on the actual requirement.
Approach 1:
The first approach is explained in the WatermarkedImages1 example. In this example, we create a PdfTemplate to which we add an image as well as some text written on top of that image. We can then wrap this PdfTemplate inside an image and add that image together with its watermark using a single document.add() statement.
This is the method that performs all the magic:
public Image getWatermarkedImage(PdfContentByte cb, Image img, String watermark) throws DocumentException {
float width = img.getScaledWidth();
float height = img.getScaledHeight();
PdfTemplate template = cb.createTemplate(width, height);
template.addImage(img, width, 0, 0, height, 0, 0);
ColumnText.showTextAligned(template, Element.ALIGN_CENTER,
new Phrase(watermark, FONT), width / 2, height / 2, 30);
return Image.getInstance(template);
}
This is how we add the images:
PdfContentByte cb = writer.getDirectContentUnder();
document.add(getWatermarkedImage(cb, Image.getInstance(IMAGE1), "Bruno"));
document.add(getWatermarkedImage(cb, Image.getInstance(IMAGE2), "Dog"));
document.add(getWatermarkedImage(cb, Image.getInstance(IMAGE3), "Fox"));
Image img = Image.getInstance(IMAGE4);
img.scaleToFit(400, 700);
document.add(getWatermarkedImage(cb, img, "Bruno and Ingeborg"));
As you can see, we have one very large image (a picture of my wife and me). We need to scale this image so that it fits the page. If you want to avoid this, take a look at the second approach.
Approach 2:
The second approach is explained in the WatermarkedImages2 example. In this case, we add each image to a PdfPCell. This PdfPCell will scale the image so that it fits the width of the page. To add the watermark, we use a cell event:
class WatermarkedCell implements PdfPCellEvent {
String watermark;
public WatermarkedCell(String watermark) {
this.watermark = watermark;
}
public void cellLayout(PdfPCell cell, Rectangle position,
PdfContentByte[] canvases) {
PdfContentByte canvas = canvases[PdfPTable.TEXTCANVAS];
ColumnText.showTextAligned(canvas, Element.ALIGN_CENTER,
new Phrase(watermark, FONT),
(position.getLeft() + position.getRight()) / 2,
(position.getBottom() + position.getTop()) / 2, 30);
}
}
This cell event can be used like this:
PdfPCell cell;
cell = new PdfPCell(Image.getInstance(IMAGE1), true);
cell.setCellEvent(new WatermarkedCell("Bruno"));
table.addCell(cell);
cell = new PdfPCell(Image.getInstance(IMAGE2), true);
cell.setCellEvent(new WatermarkedCell("Dog"));
table.addCell(cell);
cell = new PdfPCell(Image.getInstance(IMAGE3), true);
cell.setCellEvent(new WatermarkedCell("Fox"));
table.addCell(cell);
cell = new PdfPCell(Image.getInstance(IMAGE4), true);
cell.setCellEvent(new WatermarkedCell("Bruno and Ingeborg"));
table.addCell(cell);
You will use this approach if all images have more or less the same size, and if you don't want to worry about fitting the images on the page.
Consideration:
Obviously, both approaches have a different result because of the design choice that is made. Please compare the resulting PDFs to see the difference: watermark_template.pdf versus watermark_table.pdf
We have an app that draws text, but then displays a JTextArea for the user to edit the text when they click on the text. However, the wrapping between these two text-handling components differs. They use the same width, text String, and Font.
For the text-drawing, I'm using the from the Java tutorial, which I've also seen used by others in related questions here and other forums. Here's that part of the code:
FontRenderContext frc = g2d.getFontRenderContext();
TextLayout layout;
AttributedString attrString = new AttributedString(myText);
AttributedCharacterIterator charIterator;
int paragraphStart;
int paragraphEnd;
LineBreakMeasurer lineMeasurer;
float breakWidth;
float drawPosX;
float drawPosY;
attrString.addAttribute(TextAttribute.FONT, myFont);
charIterator = attrString.getIterator();
paragraphStart = charIterator.getBeginIndex();
paragraphEnd = charIterator.getEndIndex();
lineMeasurer = new LineBreakMeasurer(charIterator, frc);
// Set break width to width of Component.
breakWidth = myTextWidth;
drawPosY = startY
// Set position to the index of the first character in the paragraph.
lineMeasurer.setPosition(paragraphStart);
textBounds = new Rectangle(startX, startY(), 0, 0);
// Get lines from until the entire paragraph has been displayed.
while (lineMeasurer.getPosition() < paragraphEnd) {
layout = lineMeasurer.nextLayout(breakWidth);
// Compute pen x position. If the paragraph is right-to-left we
// will align the TextLayouts to the right edge of the panel.
drawPosX = layout.isLeftToRight()
? startX() : breakWidth - layout.getAdvance();
// Draw the TextLayout at (drawPosX, drawPosY).
layout.draw(g2d, drawPosX, drawPosY);
lineBounds = new Rectangle2D.Float(drawPosX, drawPosY - layout.getAscent(), layout.getAdvance(), (layout.getAscent() + layout.getDescent() + layout.getLeading()));
// Move y-coordinate in preparation for next layout.
drawPosY += layout.getAscent() + layout.getDescent() + layout.getLeading();
}
The JTextArea is much simpler:
JTextArea textArea = new JTextArea(myText);
textArea.setSize(myTextWidth, myTextThing.getHeight());
textArea.setOpaque(true);
textArea.setVisible(true);
textArea.setLineWrap(true);
textArea.setWrapStyleWord(true);
textArea.setFont(myFont);
textArea.setBorder(null);
I set the border to null because I have another rectangle drawn outside the bounds of the text area with a dashed area to show where it is. Might seem silly now, but we use it to show the bounds of the text area when the user first selects the text they want to edit. At that point, the JTextArea isn't yet created. They have to click on it again to begin editing. The reason for this is that once a text area is selected, they may also drag and resize the text area, and that gets messy and more confusing if they had a live JTextArea when they started dragging and resizing.
Separately, both the drawn TextLayouts and the JTextArea appear to wrap words just fine. but when used together you can see the difference. The problem with this is that while the user is editing the text, the JTextArea is doing its thing to wrap the text. But when the user JTextArea loses focus, it is converted to the drawn text, and then the words may be wrapped differently.
Fill the text area with i or l characters. Grab a UI ruler or magnifying glass and count the size of your text area in pixels from the leftmost character of the longest line to the rightmost. Do the same with n, m, and a few other characters for a few more data points. I suspect that the text area has an invisible border of a few pixels it uses even when set to no border. If this is the case, add the same border around the TextLayout component and they should appear identical.
(Alternatively to counting pixels, you could set a background color for the text or the components, but I wouldn't necessarily trust it.)