/* $Id: starter_graphics.c,v 1.5.2.1 2010/01/27 20:52:49 rjs Exp $
 * 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 7
 * Required data: none
 */
#include <stdio.h>
#include <stdlib.h>

#include "pdflib.h"


int
main(void)
{
    /* This is where the data files are. Adjust as necessary. */
    const char* searchpath = "../data";
    const char* outfile = "starter_graphics.pdf";

    PDF * p;
    double xt=20, x = 210, y=770, dy=90;
    int font;

    /* create a new PDFlib object */
    if ((p = PDF_new()) == (PDF *) 0) {
        printf("Couldn't create PDFlib object (out of memory)!\n");
        return(2);
    }

    PDF_TRY(p) {
        PDF_set_parameter(p, "SearchPath", searchpath);

        /* This means we must check return values of load_font() etc. */
        PDF_set_parameter(p, "errorpolicy", "return");

        if (PDF_begin_document(p, outfile, 0, "") == -1) {
            printf("Error: %s\n", PDF_get_errmsg(p));
            PDF_delete(p);
            return(2);
        }

        PDF_set_info(p, "Creator", "PDFlib starter sample");
        PDF_set_info(p, "Title", "starter_graphics");

        font = PDF_load_font(p, "Helvetica", 0, "winansi", "");
        if (font == -1) {
            printf("Error: %s\n", PDF_get_errmsg(p));
            PDF_delete(p);
            return(2);
        }

        /* Start an A4 page */
        PDF_begin_page_ext(p, 0, 0, "width=a4.width height=a4.height");

        /* Set the font */
        PDF_setfont(p, font, 14);

        /* Set the line width */
        PDF_setlinewidth(p, 2.0);

        /* Set the stroke color */
        PDF_setcolor(p, "stroke", "rgb", 0.0, 0.5, 0.5, 0.0);

        /* Set the fill color */
        PDF_setcolor(p, "fill", "rgb", 0.0, 0.85, 0.85, 0.0);


        /* -------------
         * Stroke a line
         * -------------
         */

        /* Set the current point for graphics output */
        PDF_moveto(p, x, y);

        /* Draw a line from the current point to the supplied point */
        PDF_lineto(p, x+300, y+50);

        /* Stroke the path using the current line width and stroke color, and
         * clear it
         */
        PDF_stroke(p);

        /* Output some descriptive black text */
        PDF_fit_textline(p, "lineto() and stroke()", 0, xt, y,
            "fillcolor={gray 0}");


        /* --------------
         * Stroke a curve
         * --------------
         */

        /* Set the current point for graphics output */
        PDF_moveto(p, x, y-=dy);

        /* Draw a Bézier curve from the current point to (x3, y3), using three
         * control points
         */
        PDF_curveto(p, 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
         */
        PDF_stroke(p);

        /* Output some descriptive black text */
        PDF_fit_textline(p, "curveto() and stroke()", 0, xt, y, 
            "fillcolor={gray 0}");


        /* ---------------
         * Stroke a circle
         * ---------------
         */

        /* Draw a circle at position (x, y) with a radius of 40 */
        PDF_circle(p, x, y-=dy, 40);

        /* Stroke the path using the current line width and stroke color, and
         * clear it
         */
        PDF_stroke(p);

        /* Output some descriptive black text */
        PDF_fit_textline(p, "circle() and stroke()", 0, 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
         */
        PDF_arc(p, x, y-=dy+20, 40, 90, 180);

        /* Stroke the path using the current line width and stroke color, and
         * clear it
         */
        PDF_stroke(p);

        /* Output some descriptive black text */
        PDF_fit_textline(p, "arc() and stroke()", 0, 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
         */
        PDF_rect(p, x, y-=dy, 200, 50);

        /* Stroke the path using the current line width and stroke color, and
         * clear it
         */
        PDF_stroke(p);

        /* Output some descriptive black text */
        PDF_fit_textline(p, "rect() and stroke()", 0, 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
         */
        PDF_rect(p, x, y-=dy, 200, 50);

        /* Fill the path using current fill color, and clear it */
        PDF_fill(p);

        /* Output some descriptive black text */
        PDF_fit_textline(p, "rect() and fill()", 0, 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
         */
        PDF_rect(p, x, y-=dy, 200, 50);

        /* Fill and stroke the path using the current line width, fill color,
         * and stroke color, and clear it
         */
        PDF_fill_stroke(p);

        /* Output some descriptive black text */
        PDF_fit_textline(p, "rect() and fill_stroke()", 0, 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 */
        PDF_moveto(p, x-40, y-=dy);

        /* Draw a line from the current point to the supplied point */
        PDF_lineto(p, 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
         */
        PDF_arc(p, 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
         */
        PDF_closepath_fill_stroke(p);

        /* Output some descriptive black text */
        PDF_fit_textline(p, "lineto(), arc(), and", 0, xt, y+20,
            "fillcolor={gray 0}");
        PDF_fit_textline(p, "closepath_fill_stroke()", 0, 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
         */
        PDF_save(p);

        /* Draw a rectangle at position (x, y) with a width of 200 and a height
         * of 50
         */
        PDF_rect(p, x, y-=dy, 200, 50);

        /* Use the current path as the clipping path for subsequent operations
         */
        PDF_clip(p);

        /* Draw a circle at position (x, y) with a radius of 100 */
        PDF_circle(p, x, y, 80);

        /* Fill the path with the current fill color and clear it
         */
        PDF_fill(p);

        /* Restore the graphics state which has been saved above */
        PDF_restore(p);

        /* Output some descriptive black text */
        PDF_fit_textline(p, "rect(), clip(),", 0, xt, y+20,
            "fillcolor={gray 0}");
        PDF_fit_textline(p, "circle(), and fill()", 0, xt, y,
            "fillcolor={gray 0}");

        PDF_end_page_ext(p, "");

        PDF_end_document(p, "");

    }
    PDF_CATCH(p) {
        printf("PDFlib exception occurred:\n");
        printf("[%d] %s: %s\n",
            PDF_get_errnum(p), PDF_get_apiname(p), PDF_get_errmsg(p));
        PDF_delete(p);
        return(2);
    }

    PDF_delete(p);
    return 0;
}
