Background Watermak and Stamping with Transparency : This demo code will draw transparent...

Sun, 13 Jul 2014 06:31:26 +0000

Author: AndrewC
Subject: 2934
Posted: 13 Jul 14 at 6:31AM

This demo code will draw transparent background image (wotermark) and text on alternate pages. It shows how to create a new content stream, draw onto it, and then move the contentstream to the background layer.

To render the resulting PDF you will need to use the new Debenu Renderer in Debenu PDF Library 10.xx versions. Refer to the README.TXT in the "Rendering and Printing Add-On" folder in the DQPL installation directory.

int ret = QP.LoadFromFile("Debenu Quick PDF Library 10.15 Reference Guide.pdf", "");

int imgId = QP.AddImageFromFile("DebenuLogo.bmp", 0);

int fontId = QP.AddStandardFont(4);

double angle = 30;

for (int i = 1; i <= QP.PageCount(); i++) // Start at page 1.

{

QP.SelectPage(i);

QP.NormalizePage(0); // Fix any page problems and remove rotation

QP.SetOrigin(1);

int csId = QP.NewContentStream(); // Create a new layer at the top that is drawn last.

QP.SelectContentStream(csId); // Select the content stream

QP.SaveState(); // Save the graphics state.

QP.SetTransparency(90);

// Now draw something into the content stream.

if (i % 2 == 0)

{

QP.SelectImage(imgId);

QP.DrawImage(0, 0, QP.PageWidth(), QP.PageHeight());

}

else // Draw text

{

QP.SelectFont(fontId);

QP.SetTextAlign(1); // Align text center

QP.SetTextSize(72);

QP.SetTextColor(0, 0, 0);

QP.DrawRotatedText(QP.PageWidth() / 2 + 3, QP.PageHeight() / 2 + 3, angle, "www.debenu.com"); // Draw Watermark at center

QP.SetTextColor(0, 0, 1);

QP.DrawRotatedText(QP.PageWidth() / 2, QP.PageHeight() / 2, angle, "www.debenu.com"); // Draw Watermark at center

double tx = QP.GetTextWidth("www.debenu.com") / 2 * Math.Cos(angle * Math.PI / 180);

double ty = QP.GetTextWidth("www.debenu.com") / 2 * Math.Sin(angle * Math.PI / 180);

double x, y, w, h;

double hx = QP.GetTextAscent() * Math.Sin(angle * Math.PI / 180);

double hy = QP.GetTextAscent() * Math.Cos(angle * Math.PI / 180);

x = QP.PageWidth() / 2 - tx - hx;

y = QP.PageHeight() / 2 - ty - hy;

w = tx * 2 + hx;

h = ty * 2 + hy;

QP.AddLinkToWeb(x, y, w, h, "http://www.debenu.com", 0);

QP.SetTextSize(132);

QP.SetTextColor(1, 0, 0);

QP.DrawRotatedText(QP.PageWidth() / 2, QP.PageHeight() / 2 - 80, angle, "DEMO"); // Draw Watermark at center

}

QP.LoadState(); // Restore the graphics state

QP.MoveContentStream(csId, 1); // Move the new layer/contentstream to bottom so it is drawn first.

}

QP.SaveToFile("out.pdf");

Debenu Quick PDF Library - PDF SDK Community Forum : Background Watermak and Stamping with Transparency

Background Watermak and Stamping with Transparency : This demo code will draw transparent...