PDFlib Cookbook

cookbook

graphics/starter_graphics

Create some basic examples of vector graphics.

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<?php
/*
 * 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
 */

/* This is where the data files are. Adjust if necessary. */
$searchpath = dirname(__FILE__,3)."/input";
$outfile = "";
$title = "Starter Graphics";

$xt=20; $x = 210; $y=770; $dy=90;

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");
    $p->set_option("stringformat=utf8");

    if ($p->begin_document($outfile, "") == 0)
        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 == 0)
        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("");

    $buf = $p->get_buffer();
    $len = strlen($buf);

    header("Content-type: application/pdf");
    header("Content-Length: $len");
    header("Content-Disposition: inline; filename=starter_graphics.pdf");
    print $buf;


} catch (PDFlibException $e){
    echo("PDFlib exception occurred:\n" .
        "[" . $e->get_errnum() . "] " . $e->get_apiname() .
        ": " . $e->get_errmsg() . "\n");
    exit(1);
} catch (Throwable $e) {
    echo("PHP exception occurred: " . $e->getMessage() . "\n");
    exit(1);
}
$p = 0;
?>