color/color_gradient
Fill some area or text with a smooth transition from one color to another.
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* Color gradient:
* Fill some area or text with a smooth transition from one color to another
* Required software: PDFlib Lite/PDFlib/PDFlib+PDI/PPS 7
* Required data: none
*/
package com.pdflib.cookbook.pdflib.color;
import com.pdflib.pdflib;
import com.pdflib.PDFlibException;
public class color_gradient
{
public static void main (String argv[])
{
/* This is where the data files are. Adjust as necessary. */
String searchpath = "../input";
String outfile = "color_gradient.pdf";
String title = "Color Gradient";
pdflib p = null;
int font, sh, pattern;
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: 1.10 $");
/* Start Page */
p.begin_page_ext(595, 842, "");
/* Fill the page completely with a gradient from green to black:
* Set the first color for the gradient to green
*/
p.setcolor("fillstroke", "rgb", 0.0, 0.5, 0.5, 0.0);
/* Set the second color for the gradient to black;
* define an axial gradient with a size similar to the the page size
*/
sh = p.shading("axial", 0, 0, 595, 842, 0.0, 0.0, 0.0, 0.0, "");
/* Draw the gradient */
p.shfill(sh);
/* Fill a rectangle with a gradient:
* Save the current graphics state
*/
p.save();
/* Set the first color for the gradient to orange */
p.setcolor("fill", "rgb", 1.0, 0.5, 0.1, 0.0);
/* Set the second color for the gradient to a light orange;
* define an axial gradient with a size similar to the size
* of the rectangle to be filled
*/
sh = p.shading("axial", 200, 200, 450, 450, 0.9, 0.8, 0.8, 0.0, "");
/* Draw a rectangle and set the clipping path to
* the shape of the rectangle
*/
p.rect(200, 200, 250, 250);
p.clip();
/* Fill the clipping path with the gradient */
p.shfill(sh);
/* Restore the current graphics state to reset the clipping path */
p.restore();
/* Fill a circle with a gradient:
* Save the current graphics state
*/
p.save();
/* Set the first color for the gradient to white */
p.setcolor("fill", "rgb", 1.0, 1.0, 1.0, 0.0);
/* Set the second color for the gradient to orange;
* define a radial gradient with a size similar to the size
* of the circle to be filled
*/
sh = p.shading("radial", 400, 600, 400, 600, 1.0, 0.5, 0.1, 0.0,
"r0 0 r1 60");
/* Draw a circle and set the clipping path to
* the shape of the circle
*/
p.circle(400, 600, 50);
p.clip();
/* Fill the clipping path with the gradient */
p.shfill(sh);
/* Restore the current graphics state to reset the clipping path */
p.restore();
/* Fill a text with a gradient:
* Load the font; for PDFlib Lite: change "unicode" to "winansi"
*/
font = p.load_font("Helvetica-Bold", "unicode", "");
if (font == -1)
throw new Exception("Error: " + p.get_errmsg());
p.setfont(font, 36);
/* Set the first color for the gradient to white */
p.setcolor("fill", "rgb", 1, 1, 1, 0);
/* Set the second color for the gradient to orange; define an axial
* gradient with a size similar to the size of the text to be filled
*/
sh = p.shading("axial", 50, 50, 50, 200, 1.0, 0.5, 0.1, 0.0, "");
/* Create a shading pattern from the shading and set the
* pattern as the current fill color
*/
pattern = p.shading_pattern(sh, "");
p.setcolor("fill", "pattern", pattern, 0, 0, 0);
/* Output the text with the gradient as current fill color */
p.show_xy("Hello World!", 50, 100);
p.continue_text("(says PDFlib GmbH)");
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();
}
}
}
}