PDFlib Cookbook

cookbook

graphics/starter_graphics

Create some basic examples of vector graphics.

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/*
 * Starter Graphics:
 * Create some basic examples of vector graphics
 * 
 * Stroke a line, curve, circle, arc, and rectangle using the current line width
 * and stroke color. Stroke and fill a rectangle. 
 * Draw an arc segment by drawing a line and an arc, closing the path and
 * filling and stroking it.
 * Draw a rectangle and use it as the clipping a path. Draw and fill a circle
 * using the clipping path defined. 
 *
 * Required software: PDFlib/PDFlib+PDI/PPS 9
 * Required data: none
 */
package com.pdflib.cookbook.pdflib.graphics;

import com.pdflib.pdflib;
import com.pdflib.PDFlibException;

public class starter_graphics
{
    public static void main (String argv[])
    {
	/* This is where the data files are. Adjust if necessary. */
	String searchpath = "../input";
	String outfile = "starter_graphics.pdf";
	String title = "Starter Graphics";

	double xt=20, x = 210, y=770, dy=90;

	pdflib p = null;

	int font;
	int exitcode = 0;

	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");

	    if (p.begin_document(outfile, "") == -1)
		throw new Exception("Error: " + p.get_errmsg());

	    p.set_info("Creator", "PDFlib Cookbook");
	    p.set_info("Title", title);
	    
	    /* Load the font. */
	    font = p.load_font("Helvetica", "unicode", "");
	    if (font == -1)
		throw new Exception("Error: " + p.get_errmsg());
	    
	    /* Start an A4 page */
	    p.begin_page_ext(0, 0, "width=a4.width height=a4.height");
	    
	    /* Set the font */
	    p.setfont(font, 14);
	    
	    /* Set the line width */
	    p.setlinewidth(2.0);
	    
	    /* Set the stroke color */
	    p.setcolor("stroke", "rgb", 0.0, 0.5, 0.5, 0.0);
	    
	    /* Set the fill color */
	    p.setcolor("fill", "rgb", 0.0, 0.85, 0.85, 0.0);

	    
	    /* -------------
	     * Stroke a line
	     * -------------
	     */
     
	    /* Set the current point for graphics output */
	    p.moveto(x, y);
	    
	    /* Draw a line from the current point to the supplied point */
	    p.lineto(x+300, y+50);

	    /* Stroke the path using the current line width and stroke color, and
	     * clear it
	     */
	    p.stroke();
	    
	    /* Output some descriptive black text */
	    p.fit_textline("lineto() and stroke()", xt, y, "fillcolor={gray 0}");
	    
	    
	    /* --------------
	     * Stroke a curve
	     * --------------
	     */
     
	   /* Set the current point for graphics output */
	    p.moveto(x, y-=dy);
	    
	    /* Draw a B�zier curve from the current point to (x3, y3), using three
	     * control points
	     */
	    p.curveto(x+50, y+40, x+200, y+80, x+300, y+30);

	    /* Stroke the path using the current line width and stroke color, and
	     * clear it
	     */
	    p.stroke();
	    
	    /* Output some descriptive black text */
	    p.fit_textline("curveto() and stroke()", xt, y, "fillcolor={gray 0}");
	    
	     
	    /* ---------------
	     * Stroke a circle
	     * ---------------
	     */
     
	    /* Draw a circle at position (x, y) with a radius of 40 */
	    p.circle(x, y-=dy, 40);
	    
	    /* Stroke the path using the current line width and stroke color, and
	     * clear it
	     */
	    p.stroke();
	    
	    /* Output some descriptive black text */
	    p.fit_textline("circle() and stroke()", xt, y, "fillcolor={gray 0}");
	    
	    
	    /* ---------------------
	     * Stroke an arc segment
	     * ---------------------
	     */
     
	    /* Draw an arc segment counterclockwise at position (x, y) with a radius
	     * of 40 starting at an angle of 90 degrees and ending at 180 degrees
	     */
	    p.arc(x, y-=dy+20, 40, 90, 180);
	    
	    /* Stroke the path using the current line width and stroke color, and
	     * clear it
	     */
	    p.stroke();
	    
	    /* Output some descriptive black text */
	    p.fit_textline("arc() and stroke()", xt, y, "fillcolor={gray 0}");
	    
	    
	    /* ------------------
	     * Stroke a rectangle
	     * ------------------
	     */
     
	    /* Draw a rectangle at position (x, y) with a width of 200 and a height
	     * of 50
	     */
	    p.rect(x, y-=dy, 200, 50);
	    
	    /* Stroke the path using the current line width and stroke color, and
	     * clear it
	     */
	    p.stroke();
	    
	    /* Output some descriptive black text */
	    p.fit_textline("rect() and stroke()", xt, y, "fillcolor={gray 0}");
	    
		 
	    /* ----------------
	     * Fill a rectangle
	     * ----------------
	     */
     
	    /* Draw a rectangle at position (x, y) with a width of 200 and a height
	     * of 50
	     */
	    p.rect(x, y-=dy, 200, 50);
	    
	    /* Fill the path using current fill color, and clear it */
	    p.fill();
	    
	    /* Output some descriptive black text */
	    p.fit_textline("rect() and fill()", xt, y, "fillcolor={gray 0}");
	    
	    
	    /* ---------------------------
	     * Fill and stroke a rectangle
	     * ---------------------------
	     */
     
	    /* Draw a rectangle at position (x, y) with a width of 200 and a height
	     * of 50
	     */
	    p.rect(x, y-=dy, 200, 50);
	    
	    /* Fill and stroke the path using the current line width, fill color,
	     * and stroke color, and clear it
	     */
	    p.fill_stroke();
	    
	    /* Output some descriptive black text */
	    p.fit_textline("rect() and fill_stroke()", xt, y, "fillcolor={gray 0}");
	    
	    
	    /* -------------------------------------------------------------
	     * Draw a line and an arc, close the path and fill and stroke it
	     * -------------------------------------------------------------
	     */
     
	    /* Set the current point for graphics output */
	    p.moveto(x-40, y-=dy);
	    
	    /* Draw a line from the current point to the supplied point */
	    p.lineto(x, y);
	    
	    /* Draw an arc segment counterclockwise at position (x, y) with a radius
	     * of 40 starting at an angle of 90 degrees and ending at 180 degrees
	     */
	    p.arc(x, y, 40, 90, 180);

	    /* Close the path and stroke and fill it, i.e. close the current subpath
	     * (add a straight line segment from the current point to the starting
	     * point of the path), and stroke and fill the complete current path
	     */
	    p.closepath_fill_stroke();
	    
	    /* Output some descriptive black text */
	    p.fit_textline("lineto(), arc(), and", xt, y+20, "fillcolor={gray 0}");
	    p.fit_textline("closepath_fill_stroke()", xt, y, "fillcolor={gray 0}");
	    
	    
	    /* -----------------------------------------------------------------
	     * Draw a rectangle and use it as the clipping a path. Draw and fill
	     * a circle and clip it according to the clipping path defined. 
	     * -----------------------------------------------------------------
	     */
	    
	    /* Save the current graphics state including the current clipping
	     * path which is set to the entire page by default
	     */
	    p.save();
	   
	    /* Draw a rectangle at position (x, y) with a width of 200 and a height
	     * of 50
	     */
	    p.rect(x, y-=dy, 200, 50);
	    
	    /* Use the current path as the clipping path for subsequent operations
	     */
	    p.clip();
     
	    /* Draw a circle at position (x, y) with a radius of 100 */
	    p.circle(x, y, 80);
	    
	    /* Fill the path with the current fill color and clear it
	     */
	    p.fill();
	    
	    /* Restore the graphics state which has been saved above */
	    p.restore();
	    
	    /* Output some descriptive black text */
	    p.fit_textline("rect(), clip(),", xt, y+20, "fillcolor={gray 0}");
	    p.fit_textline("circle(), and fill()", xt, y, "fillcolor={gray 0}");
	    
	    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);
	    exitcode = 1;
        } finally {
            if (p != null) {
                p.delete();
            }
	    System.exit(exitcode);
        }
    }
}