graphics/crop_marks
Create crop marks which specify the "cutting area". The crop marks are adjusted to the actual trim box of the PDF page.
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import com.pdflib.pdflib;
import com.pdflib.PDFlibException;
/**
* Crop marks.
*
* Create crop marks which specify the "cutting area". The crop marks are
* adjusted to the actual trim box of the PDF page.
*
* Required software: PDFlib/PDFlib+PDI/PPS 8
* Required data: none
*
* @version $Id: crop_marks.java,v 1.4 2011/08/08 12:47:54 stm Exp $
*/
public class crop_marks {
/**
* The width of the trim box.
*/
private static final double TRIMBOX_WIDTH = 595;
/**
* The height of the trim box;
*/
private static final double TRIMBOX_HEIGHT = 842;
/**
* Margin in x direction around trim box (at right and left)
*/
private static final double TRIMBOX_X_MARGIN = 80;
/**
* Margin in y direction around trim box (at top and bottom)
*/
private static final double TRIMBOX_Y_MARGIN = 100;
/**
* The gap from the crop mark to the corner of the trimbox
*/
private static final double CROP_MARK_GAP_TO_CORNER = 20;
/**
* The number of triangles per triangled circle.
*/
private static final int NUM_TRIANGLES = 36;
private void run() {
/* This is where the data files are. Adjust if necessary. */
final String searchpath = "../input";
final String outfile = "crop_marks.pdf";
final String title = "Crop Marks";
pdflib p = null;
try {
p = new pdflib();
p.set_parameter("SearchPath", searchpath);
p.set_parameter("errorpolicy", "exception");
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: 1.4 $");
/*
* Construct the values for the height, width, mediabox and
* trimbox constants.
*/
final double trimbox_llx = TRIMBOX_X_MARGIN;
final double trimbox_lly = TRIMBOX_Y_MARGIN;
final double trimbox_urx = trimbox_llx + TRIMBOX_WIDTH;
final double trimbox_ury = trimbox_lly + TRIMBOX_HEIGHT;
final double mediabox_width = TRIMBOX_WIDTH + 2 * TRIMBOX_X_MARGIN;
final double mediabox_height = TRIMBOX_HEIGHT + 2
* TRIMBOX_Y_MARGIN;
p.begin_page_ext(0, 0, "width=" + mediabox_width + " height="
+ mediabox_height + " trimbox={" + trimbox_llx + " "
+ trimbox_lly + " " + trimbox_urx + " " + trimbox_ury + "}");
/*
* Compute the length of the crop mark lines. As the margin around
* the trim box is not necessarily equally large in x and y
* direction, the smaller one takes precedence.
*/
final double crop_mark_x_length = TRIMBOX_X_MARGIN - 2
* CROP_MARK_GAP_TO_CORNER;
final double crop_mark_y_length = TRIMBOX_Y_MARGIN - 2
* CROP_MARK_GAP_TO_CORNER;
final double crop_mark_length = Math.min(crop_mark_x_length,
crop_mark_y_length);
/*
* Create a path with the two lines for the crop mark
*/
int crop_mark = -1;
crop_mark = p.add_path_point(crop_mark, 0,
- CROP_MARK_GAP_TO_CORNER, "move",
"stroke nofill strokecolor={gray 0}");
crop_mark = p.add_path_point(crop_mark, 0, -crop_mark_length
- CROP_MARK_GAP_TO_CORNER, "line", "");
crop_mark = p.add_path_point(crop_mark, -CROP_MARK_GAP_TO_CORNER,
0, "move", "stroke nofill strokecolor={gray 0}");
crop_mark = p.add_path_point(crop_mark, -crop_mark_length
- CROP_MARK_GAP_TO_CORNER, 0, "line", "");
/*
* The length of the crop mark line is 3 times the radius of
* crop mark outer circle.
*/
final double crop_mark_radius = crop_mark_length / 3;
int registration_mark = create_registration_mark(p, crop_mark_radius);
int circle_with_rays = create_circle_with_rays(p, crop_mark_radius);
/*
* Draw the crop marks at the four corners of the trim box.
*/
final double crop_mark_displacement = CROP_MARK_GAP_TO_CORNER
+ crop_mark_length / 2;
int step;
for (step = 0; step < 4; step += 1) {
final double x = TRIMBOX_X_MARGIN + (((step + 1) % 4) / 2)
* TRIMBOX_WIDTH;
final double y = TRIMBOX_Y_MARGIN + (step / 2) * TRIMBOX_HEIGHT;
draw_corner(p, step * 90, x, y, crop_mark_displacement, crop_mark,
registration_mark, circle_with_rays,
(step + 1) % 2 == 0);
}
/*
* Construct the shading bars.
*/
final double color_field_size = 2 * crop_mark_radius;
final String colors[] = { "{cmyk 0 0 0 1}", "{cmyk 1 1 1 0}",
"{cmyk 1 0 1 0}", "{cmyk 0 1 1 0}", "{cmyk 1 1 0 0}",
"{cmyk 0 0 1 0}", "{cmyk 0 1 0 0}", "{cmyk 1 0 0 0}" };
int color_boxes = create_shading_bar(p, color_field_size, colors, true);
final String gray_shades[] = { "{gray 0.1}", "{gray 0.2}",
"{gray 0.3}", "{gray 0.4}", "{gray 0.5}", "{gray 0.6}",
"{gray 0.7}", "{gray 0.8}", "{gray 0.9}", "{gray 1}", };
int grayscale_boxes = create_shading_bar(p, color_field_size,
gray_shades, false);
/*
* Position color boxes aligned to the center of the horizontal crop
* marks.
*/
p.draw_path(color_boxes,
TRIMBOX_X_MARGIN - CROP_MARK_GAP_TO_CORNER
- crop_mark_length / 2 - color_field_size / 2,
TRIMBOX_Y_MARGIN + TRIMBOX_HEIGHT / 2 - colors.length / 2
* color_field_size,
"fill stroke");
p.draw_path(color_boxes,
TRIMBOX_X_MARGIN + TRIMBOX_WIDTH + CROP_MARK_GAP_TO_CORNER
+ crop_mark_length / 2 - color_field_size / 2,
TRIMBOX_Y_MARGIN + TRIMBOX_HEIGHT / 2
- colors.length / 2 * color_field_size,
"fill stroke");
/*
* Position grayscale bar at the bottom aligned to the center of the
* vertical crop marks.
*/
p.draw_path(grayscale_boxes,
TRIMBOX_X_MARGIN + TRIMBOX_WIDTH / 2
- gray_shades.length / 2 * color_field_size,
TRIMBOX_Y_MARGIN - CROP_MARK_GAP_TO_CORNER
- crop_mark_length / 2 + color_field_size / 2,
"fill stroke orientate=270");
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();
}
}
}
/**
* Create a path object for a circle with rays towards the center.
*
* @param p
* the pdflib object
* @param radius
* the radius of the circle
* @return a handle for the newly created path object
*
* @throws PDFlibException
*/
private int create_circle_with_rays(pdflib p, final double radius)
throws PDFlibException {
int step;
/*
* Circle with rays to the center.
*/
int circle_with_rays = -1;
circle_with_rays = p.add_path_point(circle_with_rays,
-radius, 0, "move",
"nofill stroke strokecolor={gray 0}");
circle_with_rays = p.add_path_point(circle_with_rays,
radius, 0, "control", "");
circle_with_rays = p.add_path_point(circle_with_rays,
-radius, 0, "circular", "");
/*
* The inner circle that remains open is 1/10 the size of the outer
* circle.
*/
final double inner_radius = radius / 10;
final double angle_step = 2 * Math.PI / NUM_TRIANGLES;
/*
* Construct the triangles easily by using polar coordinates.
*/
for (step = 0; step < NUM_TRIANGLES; step += 1) {
/*
* Move to inner vertex of arc segment.
*/
circle_with_rays = p.add_path_point(circle_with_rays,
inner_radius, step * angle_step, "move",
"fill nostroke close fillcolor={gray 0} polar radians");
/*
* Construct an arc segment.
*/
circle_with_rays = p.add_path_point(circle_with_rays,
radius, step * angle_step - angle_step / 4,
"line", "polar radians");
circle_with_rays = p.add_path_point(circle_with_rays,
radius, step * angle_step,
"control", "polar radians");
circle_with_rays = p.add_path_point(circle_with_rays,
radius, step * angle_step + angle_step / 4,
"circular", "polar radians");
}
return circle_with_rays;
}
/**
* Create a path object for a registration mark.
*
* @param p
* the pdflib object
* @param radius
* the radius of the crop mark
*
* @return a handle for the new path object
*
* @throws PDFlibException
*/
private int create_registration_mark(pdflib p, final double radius)
throws PDFlibException {
int registration_mark = -1;
/*
* Long black lines
*/
int step;
for (step = 0; step < 2; step += 1) {
registration_mark = p.add_path_point(registration_mark,
radius, step * 90,
"move", "stroke nofill strokecolor={gray 0} polar");
registration_mark = p.add_path_point(registration_mark,
radius, (step + 2) * 90, "line", "polar");
}
/*
* Inner circle
*/
registration_mark = p.add_path_point(registration_mark,
-radius / 3, 0, "move",
"fill nostroke strokecolor={gray 0} fillcolor={gray 0}");
registration_mark = p.add_path_point(registration_mark,
radius / 3, 0, "control", "");
registration_mark = p.add_path_point(registration_mark,
-radius / 3, 0, "circular", "");
/*
* Short white lines
*/
for (step = 0; step < 2; step += 1) {
registration_mark =
p.add_path_point(registration_mark, radius / 3, step * 90,
"move", "stroke nofill strokecolor={gray 1} polar");
registration_mark = p.add_path_point(registration_mark,
radius / 3, (step + 2) * 90, "line", "polar");
}
/*
* Outer circle
*/
registration_mark = p.add_path_point(registration_mark, -2
* radius / 3, 0, "move",
"stroke nofill strokecolor={gray 0}");
registration_mark = p.add_path_point(registration_mark,
2 * radius / 3, 0, "control", "");
registration_mark = p.add_path_point(registration_mark, -2
* radius / 3, 0, "circular", "");
return registration_mark;
}
/**
* Create a shading bar as a path object with colored boxes.
*
* @param p
* the pdflib object
* @param color_field_size
* size of the square color boxes
* @param colors
* array of PDFlib color names
* @param stroke
* whether to stroke the boxes with a black border
*
* @return the path handle for the shading bar
*
* @throws PDFlibException
*/
private int create_shading_bar(pdflib p, final double color_field_size,
final String[] colors, boolean stroke) throws PDFlibException {
int step;
int shading_bar = -1;
for (step = 0; step < colors.length; step += 1) {
double lly = step * color_field_size;
final String stroke_opt = stroke ? "stroke" : "nostroke";
shading_bar = p.add_path_point(shading_bar, 0, lly, "move",
stroke_opt + " fill close strokecolor={gray 0} fillcolor="
+ colors[step]);
shading_bar = p.add_path_point(shading_bar, 0, lly
+ color_field_size, "line", "");
shading_bar = p.add_path_point(shading_bar, color_field_size, lly
+ color_field_size, "line", "");
shading_bar = p.add_path_point(shading_bar, color_field_size, lly,
"line", "");
}
return shading_bar;
}
/**
* Create the crop marks and other graphic elements for one corner.
*
* @param p
* the pdflib object
* @param angle
* the rotation of the graphic elements
* @param x
* the x coordinate
* @param y
* the y coordinate
* @param crop_mark_displacement
* displacement of the crop marks relative to the corner
* @param crop_mark
* path handle for the crop mark
* @param registration_mark
* path handle for the registration mark
* @param circle_with_rays
* path handle for the circle containing rays
* @param draw_circle_with_rays
* whether to draw the triangled circle
*
* @throws PDFlibException
*/
private void draw_corner(pdflib p, int angle, double x, double y,
final double crop_mark_displacement, int crop_mark,
int registration_mark, int circle_with_rays,
boolean draw_circle_with_rays) throws PDFlibException {
p.save();
p.translate(x, y);
p.rotate(angle);
p.draw_path(crop_mark, 0, 0, "fill stroke");
p.draw_path(registration_mark, -crop_mark_displacement,
crop_mark_displacement, "fill stroke");
p.draw_path(registration_mark, crop_mark_displacement,
-crop_mark_displacement, "fill stroke");
if (draw_circle_with_rays) {
p.draw_path(circle_with_rays, -crop_mark_displacement,
-crop_mark_displacement, "fill stroke");
}
p.restore();
}
public static void main(String argv[]) {
crop_marks instance = new crop_marks();
instance.run();
}
}