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Rotate watermark text at 45 degree angle across the center Apache PDFBox


Rotate watermark text at 45 degree angle across the center Apache PDFBox

By : Krishna
Date : November 21 2020, 07:01 PM
I hope this helps . What I do is to first rotate based on the calculated angle. In this "rotated world" I do a horizontal offset so that the text is in the middle, and also move the text vertically a bit lower, so that it is in the "vertical" middle of an imagined diagonal line (horizontal in the "rotated world").
code :
try (PDDocument doc = new PDDocument())
{
    PDPage page = new PDPage();
    doc.addPage(page);

    PDFont font = PDType1Font.HELVETICA_BOLD;
    try (PDPageContentStream cs =
            new PDPageContentStream(doc, page, PDPageContentStream.AppendMode.APPEND, true, true))
        // use this long constructor when working on existing PDFs
    {
        float fontHeight = 110;
        String text = "Watermark";

        float width = page.getMediaBox().getWidth();
        float height = page.getMediaBox().getHeight();
        int rotation = page.getRotation();
        switch (rotation)
        {
            case 90:
                width = page.getMediaBox().getHeight();
                height = page.getMediaBox().getWidth();
                cs.transform(Matrix.getRotateInstance(Math.toRadians(90), height, 0));
                break;
            case 180:
                cs.transform(Matrix.getRotateInstance(Math.toRadians(180), width, height));
                break;
            case 270:
                width = page.getMediaBox().getHeight();
                height = page.getMediaBox().getWidth();
                cs.transform(Matrix.getRotateInstance(Math.toRadians(270), 0, width));
                break;
            default:
                break;
        }
        float stringWidth = font.getStringWidth(text) / 1000 * fontHeight;
        float diagonalLength = (float) Math.sqrt(width * width + height * height);
        float angle = (float) Math.atan2(height, width);
        float x = (diagonalLength - stringWidth) / 2; // "horizontal" position in rotated world
        float y = -fontHeight / 4; // 4 is a trial-and-error thing, this lowers the text a bit
        cs.transform(Matrix.getRotateInstance(angle, 0, 0));
        cs.setFont(font, fontHeight);
        //cs.setRenderingMode(RenderingMode.STROKE); // for "hollow" effect

        PDExtendedGraphicsState gs = new PDExtendedGraphicsState();
        gs.setNonStrokingAlphaConstant(0.2f);
        gs.setStrokingAlphaConstant(0.2f);
        gs.getCOSObject().setItem(COSName.BM, COSName.MULTIPLY);
        // gs.setBlendMode(BlendMode.MULTIPLY); // will work in 2.0.14
        cs.setGraphicsStateParameters(gs);

        // some API weirdness here. When int, range is 0..255.
        // when float, this would be 0..1f
        cs.setNonStrokingColor(255, 0, 0);
        cs.setStrokingColor(255, 0, 0);

        cs.beginText();
        cs.newLineAtOffset(x, y);
        cs.showText(text);
        cs.endText();
    }
    doc.save("watermarked.pdf");
}


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Rotate a square by an angle in degree

Rotate a square by an angle in degree


By : developer
Date : March 29 2020, 07:55 AM
I hope this helps you . It's such a simple thing -- you've got the formula wrong for all of your y-values.
It should be:
code :
ya_new = sin(theta) * (xa - x) + cos(theta) * (ya - y) + y
Unity | Rotate the gameObject by specified angle (0~360 degree)

Unity | Rotate the gameObject by specified angle (0~360 degree)


By : toad
Date : March 29 2020, 07:55 AM
around this issue Use RotateAround.
code :
// Rotate around world y.
transform.RotateAround(transform.position, Vector3.up, angle);

// Rotate around local y.
transform.RotateAround(transform.position, transform.up, angle);
Apache PdfBox Rotate Crop Box Only Not Text

Apache PdfBox Rotate Crop Box Only Not Text


By : Warut Kritrungraung
Date : March 29 2020, 07:55 AM
hope this fix your issue So this might not work for everyone but I figured it out for my specific requirement. TextToPDF has a method called setLandscape before creating the pdf from text. textToPDF.setLandscape(true);
Rotate object 360 degree with some tilted angle or in ellipse shape using css or js

Rotate object 360 degree with some tilted angle or in ellipse shape using css or js


By : Tom Bender
Date : March 29 2020, 07:55 AM
This might help you To give the arm a 3d look you need to rotate it in the X axis - this is in addition to the Z axis rotation that you're already doing.
code :
.scara-arm {
  transform: rotateZ(0deg) rotateX(55deg);
}
.circle-small {
  perspective: 75em;
}
How to rotate the watermark text to a certain angle using react-image-process

How to rotate the watermark text to a certain angle using react-image-process


By : user3137809
Date : March 29 2020, 07:55 AM
wish of those help This is not possible with the selected library. The only supported rotation is of the image itself when you set the "mode" to "rotate". However, then you cannot apply the waterMark. There is no option to rotate just the watermark text.
See More: https://www.npmjs.com/package/react-image-process
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