textflow/text_on_color
Place a text line and a Textflow on a colored background.
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/*
* Text on colored background:
* Place a text line and a Textflow on a colored background
*
* Place a text line on a colored background using info_textline() to get the
* dimensions of the text line. Place a text line using the "matchbox" option
* which provides a more versatile way for text calculations.
* Fit a Textflow on a colored background. The colored background is
* created with a Textflow matchbox.
*
* Required software: PDFlib/PDFlib+PDI/PPS 10
* Required data: none
*/
package com.pdflib.cookbook.pdflib.textflow;
import com.pdflib.pdflib;
import com.pdflib.PDFlibException;
public class text_on_color {
public static void main(String argv[]) {
/* This is where the data files are. Adjust as necessary. */
String searchpath = "../input";
String outfile = "text_on_color.pdf";
String title = "Text on colored Background";
pdflib p = null;
int tf = -1, x = 50, y;
String result, optlist;
double width, height;
int exitcode = 0;
String textline = "Giant Wing Paper Plane";
String textflow =
"To fold the famous rocket looper proceed as follows:\nTake a A4 "
+ "sheet. Fold it lenghtwise in the middle. Then, fold the upper "
+ "corners down. Fold the long sides inwards that the points A "
+ "and B meet on the central fold. Fold the points C and D that "
+ "the upper corners meet with the central fold as well. Fold the "
+ "plane in the middle. Fold the wings down that they close with "
+ "the lower border of the plane.";
try {
p = new pdflib();
p.set_option("searchpath={" + searchpath + "}");
/* This means we must check return values of load_font() etc. */
p.set_option("errorpolicy=return");
/* Set an output path according to the name of the topic */
if (p.begin_document(outfile, "") == -1)
throw new Exception("Error: " + p.get_errmsg());
p.set_info("Creator", "PDFlib Cookbook");
p.set_info("Title", title);
/* Start Page */
p.begin_page_ext(0, 0, "width=a4.width height=a4.height");
/* --------- Text line: Method I -------- */
/*
* Place a text line with a colored background using info_textline()
* for retrieving the width and height of the default box for the
* text. The height will be the capheight of the font by default. To
* use another font property use the "matchbox" option as shown
* below.
*/
optlist = "fontname=NotoSerif-Regular fontsize=40 "
+ "fillcolor={gray 1}";
width = p.info_textline(textline, "width", optlist);
height = p.info_textline(textline, "height", optlist);
/* Draw a rectangle with exactly the retrieved width and height */
p.setcolor("fill", "rgb", 0.0, 0.8, 0.8, 0);
p.rect(x, 700, width, height);
p.fill();
/* Place the text line on the rectangle */
p.fit_textline(textline, x, 700, optlist);
/* --------- Text line: Method II -------- */
/*
* Place a text line with a colored background in a single
* fit_textline() call. The "matchbox" option is used to specify the
* rectangle to be colored. The "boxheight" suboption defines the
* height of the matchbox while "offsetbottom" and "offsettop" adds
* some space at the top and bottom. The width of the matchbox is
* specified by the text width plus the space defined by
* "offsetleft" and "offsetright".
*/
optlist = "fontname=NotoSerif-Regular fontsize=40 "
+ "fillcolor={gray 1} "
+ "matchbox={fillcolor={rgb 0 0.8 0.8} "
+ "boxheight={ascender descender}}";
/* Place the text line */
p.fit_textline(textline, x, 600, optlist);
/*
* To increase the matchbox beyond the text, use "offsetbottom" and
* "offsettop" to add some space at the top and bottom. Use
* "offsetleft" and "offsetright" to add some space to the left and
* right.
*/
optlist = "fontname=NotoSerif-Regular fontsize=40 "
+ "fillcolor={gray 1} "
+ "matchbox={fillcolor={rgb 0 0.8 0.8} "
+ "boxheight={ascender descender} "
+ "offsetleft=-8 offsetright=8 offsettop=8 offsetbottom=-8}";
/* Place the text line */
p.fit_textline(textline, x, 500, optlist);
/* --------- Textflow on a colored background -------- */
/*
* Place a white Textflow on a green background. The
* background is created with a matchbox.
*/
optlist = "fontname=NotoSerif-Regular fontsize=20 "
+ "fillcolor={gray 1}";
tf = p.add_textflow(tf, textflow, optlist);
if (tf == -1)
throw new Exception("Error: " + p.get_errmsg());
/* Vertical start of the rectangle. */
y = 430;
/* Width for textflow */
width = 500;
/*
* Now fit the textflow while creating a colored matchbox as
* background.
*/
result = p.fit_textflow(tf, x, 0, x + width, y,
"matchbox={fillcolor={rgb 0.0 0.8 0.8}}");
if (!result.equals("_stop")) {
/* Check for errors or more text to be placed */
}
/* Get the height of the Textflow placed. */
height = p.info_textflow(tf, "textheight");
/*
* Place next rectangle by moving the vertical start point down
* according to the height of the previous textflow plus an
* additional offset.
*/
y -= height + 50;
/*
* Fit the Textflow a second time and this time add a margin for the
* matchbox. To rewind to the initial Textflow status use
* "rewind=1".
*/
result = p.fit_textflow(tf, x, 0, x + width, y,
"rewind=1 matchbox={margin=-10 fillcolor={rgb 0.0 0.8 0.8}}");
if (!result.equals("_stop")) {
/* Check for errors or more text to be placed */
}
p.end_page_ext("");
p.end_document("");
}
catch (PDFlibException e) {
System.err.println("PDFlib exception occurred:");
System.err.println("[" + e.get_errnum() + "] " + e.get_apiname() +
": " + e.get_errmsg());
exitcode = 1;
}
catch (Exception e) {
System.err.println(e.toString());
exitcode = 1;
}
finally {
if (p != null) {
p.delete();
}
System.exit(exitcode);
}
}
}