graphics/fill_pattern
Define some hatching patterns and use them to fill arbitrary shapes. Create a green pattern with a hatching of rising lines and fill a rectangle with it. Create pattern with a hatching of falling lines and fill a rectangle with it using the colors currently being set. Create a colored pie chart using the two hatchings and various stroke colors. Create a more complex hatching pattern and fill a circle with it.
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* Fill pattern:
* Define some hatching patterns and use them to fill arbitrary shapes.
*
* Create a green pattern with a hatching of rising lines and fill a rectangle
* with it. Create pattern with a hatching of falling lines and fill a
* rectangle with it using the colors currently being set. Create a colored pie
* chart using the two hatchings and various stroke colors. Create a more
* complex hatching pattern and fill a circle with it.
*
* Required software: PDFlib Lite/PDFlib/PDFlib+PDI/PPS 7
* Required data: none
*/
package com.pdflib.cookbook.pdflib.graphics;
import com.pdflib.pdflib;
import com.pdflib.PDFlibException;
public class fill_pattern
{
public static void main (String argv[])
{
/* This is where the data files are. Adjust if necessary. */
String searchpath = "../input";
String outfile = "fill_pattern.pdf";
String title = "Fill Pattern";
pdflib p = null;
double w, h;
int pattern1, pattern2, pattern3;
try {
p = new pdflib();
p.set_parameter("SearchPath", searchpath);
/* This means we must check return values of load_font() etc. */
p.set_parameter("errorpolicy", "return");
if (p.begin_document(outfile, "") == -1)
throw new Exception("Error: " + p.get_errmsg());
p.set_info("Creator", "PDFlib Cookbook");
p.set_info("Title", title + " $Revision: 1.7 $");
/* -----------------------------------------------------------------
* Define Pattern I, a green pattern with a hatching of rising lines
* -----------------------------------------------------------------
*
* Define a pattern with a width of w and a height of h. When
* repeatedly placing the pattern an x-offset of w and an y-offset
* of h is used. The stroke color is defined within the pattern
* (painttype=1).
*/
w = 10;
h = 10;
pattern1 = p.begin_pattern(w, h, w, h, 1);
/* Set the stroke color for the pattern to green.
* Draw three lines with an angle of sin(h/w). For a smooth transition
* from one line segment to the adjacent when output the pattern
* repeatedly: First, set the line cap to beyond the line end. Second,
* stroke not one but three line elements with a distance of w between
* each other (while having a pattern's x-offset of w).
*/
p.setlinewidth(0.5);
p.setlinecap(2);
p.setcolor("stroke", "rgb", 0.0, 0.5, 0.5, 0);
p.moveto(0, 0);
p.lineto(w, h);
p.moveto(w, 0);
p.lineto(2*w, h);
p.moveto(-w, 0);
p.lineto(0, h);
p.stroke();
p.end_pattern();
/* --------------------------------------------------
* Define Pattern II with a hatching of falling lines
* --------------------------------------------------
*
* Define a pattern with a width of w and a height of h. When
* repeatedly placing the pattern an x-offset of w and an y-offset
* of h is used. The pattern will have no color on its own but will
* be colorized later by the fill color which is set at the time the
* pattern will be used (painttype=2).
*/
w = 10;
h = 10;
pattern2 = p.begin_pattern(w, h, w, h, 2);
/* Draw three lines with an angle of -sin(h/w). For a smooth transition
* from one line segment to the adjacent when output the pattern
* repeatedly: First, set the line cap to beyond the line end. Second,
* stroke not one but three line elements with a distance of w between
* each other (while having a pattern's x-offset of w).
*/
/* Set the stroke line width for the pattern */
p.setlinewidth(0.5);
/* Set the line cap beyond the line ends */
p.setlinecap(2);
/* Define and stroke the path for the pattern */
p.moveto(0, h);
p.lineto(w, 0);
p.moveto(w, h);
p.lineto(2*w, 0);
p.moveto(-w, h);
p.lineto(0, 0);
p.stroke();
p.end_pattern();
/* ---------------------------------------------------------------
* Define Pattern III, a more complex light green hatching pattern
* ---------------------------------------------------------------
*
* The stroke color is defined within the pattern (painttype=1) as a
* shade of green.
*/
w = 5;
h = 10;
pattern3 = p.begin_pattern(w, h, w, h, 1);
/* Define a custom color for the pattern */
p.setcolor("stroke", "rgb", 0.4, 0.5, 0.2, 0);
p.setlinewidth(0.5);
/* Set the line cap beyond the line end */
p.setlinecap(2);
/* Define and stroke the path for the pattern to be used */
p.moveto(0, 0);
p.lineto(w, h / 2);
p.lineto(0, h);
p.stroke();
p.moveto(0, h / 2);
p.lineto(w / 2, h / 4);
p.stroke();
p.moveto(w, h);
p.lineto(w / 2, 3 * h / 4);
p.stroke();
p.end_pattern();
p.begin_page_ext(500, 500, "");
/* ------------------------------
* Output graphics with pattern I
* ------------------------------
*
* Set the stroke color to black.
* Set the green pattern I as the fill color.
*/
p.setcolor("stroke", "gray", 0.0, 0.0, 0.0, 0);
p.setcolor("fill", "pattern", pattern1, 0, 0, 0);
/* Draw a rectangle with the current fill color, i.e. filled with
* pattern I repeatedly applied. The rectangle will have a border
* colored with the current stroke color which as been set to black
* above.
*/
p.rect(50, 300, 150, 100);
p.fill_stroke();
/* -------------------------------
* Output graphics with pattern II
* -------------------------------
*
* Set the fill and stroke color to light red.
* Set pattern II as the fill color. Since pattern II has no inherent
* stroke color it will use the stroke color currently being set.
*/
p.setcolor("fillstroke", "rgb", 1.0, 0.5, 0.5, 0);
p.setcolor("fill", "pattern", pattern2, 0, 0, 0);
/* Draw a rectangle with the current fill color, i.e. filled with
* pattern II repeatedly applied. Set the line width of the rectangle
* borders to the line width of the pattern
*/
p.setlinewidth(0.5);
p.rect(250, 300, 150, 100);
p.fill_stroke();
/* Set the current stroke color to green. Draw an arc segment
* as part of a pie chart. The arc will be filled with the green
* pattern II set as current fill color above. The borders will be
* stroked with the stroke color currently being set to green.
*/
p.setlinewidth(1);
p.setcolor("stroke", "rgb", 0.0, 0.5, 0.5, 0);
p.moveto(100, 150);
p.lineto(100, 200);
p.arcn(100, 150, 50, 90, 120);
p.closepath_fill_stroke();
/* Set pattern I as the current fill color */
p.setcolor("fill", "pattern", pattern1, 0, 0, 0);
/* Set the current stroke color to light red */
p.setcolor("stroke", "rgb", 1.0, 0.5, 0.5, 0);
/* Draw another smaller arc segment as part of the pie chart */
p.moveto(100, 150);
p.lineto(100, 200);
p.arc(100, 150, 50, 90, 120);
p.closepath_fill_stroke();
/* --------------------------------
* Output graphics with pattern III
* --------------------------------
*
* Set pattern III as the fill color
*/
p.setcolor("fill", "pattern", pattern3, 0, 0, 0);
/* Draw a circle with the current fill color, i.e. filled with
* the light green pattern III repeatedly being applied
*/
p.circle(350, 150, 100);
p.fill();
p.end_page_ext("");
p.end_document("");
} catch (PDFlibException e) {
System.err.print("PDFlib exception occurred:\n");
System.err.print("[" + e.get_errnum() + "] " + e.get_apiname() +
": " + e.get_errmsg() + "\n");
} catch (Exception e) {
System.err.println(e.getMessage());
} finally {
if (p != null) {
p.delete();
}
}
}
}