head	1.5;
access;
symbols;
locks; strict;
comment	@ * @;


1.5
date	2005.05.17.15.24.39;	author cworth;	state Exp;
branches;
next	1.4;
commitid	22b4428a0cb74567;

1.4
date	2005.05.17.14.31.43;	author cworth;	state Exp;
branches;
next	1.3;
commitid	2e0428a004e4567;

1.3
date	2005.04.02.04.20.39;	author cworth;	state Exp;
branches;
next	1.2;

1.2
date	2004.05.11.14.52.19;	author pippin;	state Exp;
branches;
next	1.1;

1.1
date	2003.08.18.18.11.38;	author cworth;	state Exp;
branches;
next	;


desc
@@


1.5
log
@
        * bevels.c:
        * caps_joins.c:
        * hering.c:
        * outline.c:
        * snapping.c:
        * spiral.c:
        * splines_tolerance.c:
        * star_and_ring.c:
        * stars.c:
        * text-rotate.c:
        * text.c: Remove stale includes of write_png.h.
@
text
@/*
 * Copyright © 2003 USC, Information Sciences Institute
 *
 * Permission to use, copy, modify, distribute, and sell this software
 * and its documentation for any purpose is hereby granted without
 * fee, provided that the above copyright notice appear in all copies
 * and that both that copyright notice and this permission notice
 * appear in supporting documentation, and that the name of the
 * University of Southern California not be used in advertising or
 * publicity pertaining to distribution of the software without
 * specific, written prior permission. The University of Southern
 * California makes no representations about the suitability of this
 * software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 *
 * THE UNIVERSITY OF SOUTHERN CALIFORNIA DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THE UNIVERSITY OF
 * SOUTHERN CALIFORNIA BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
 * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Author: Carl D. Worth <cworth@@isi.edu>
 */

#include <cairo.h>

void
draw_spline (cairo_t *cr, double height);

void
draw_splines (cairo_t *cr, int width, int height);

#define WIDTH 600
#define HEIGHT 300
#define STRIDE (WIDTH * 4)

unsigned char image[STRIDE*HEIGHT];

int
main (void)
{
    cairo_surface_t *surface;
    cairo_t *cr;

    surface = cairo_image_surface_create_for_data (image, CAIRO_FORMAT_ARGB32,
						   WIDTH, HEIGHT, STRIDE);

    cr = cairo_create (surface);

    cairo_rectangle (cr, 0, 0, WIDTH, HEIGHT);
    cairo_set_source_rgb (cr, 1, 1, 1);
    cairo_fill (cr);

    draw_splines (cr, WIDTH, HEIGHT);

    cairo_surface_write_to_png (surface, "splines_tolerance.png");

    cairo_destroy (cr);

    cairo_surface_destroy (surface);

    return 0;
}

void
draw_spline (cairo_t *cr, double height)
{
    cairo_move_to (cr, 0, .1 * height);
    height = .8 * height;
    cairo_rel_curve_to (cr,
		  -height/2, height/2,
		  height/2, height/2,
		  0, height);
    cairo_stroke (cr);
}

void
draw_splines (cairo_t *cr, int width, int height)
{
    int i;
    double tolerance[5] = {.1, .5, 1, 5, 10};
    double line_width = .08 * width;
    double gap = width / 6;

    cairo_set_source_rgb (cr, 0, 0, 0);
    cairo_set_line_width (cr, line_width);

    cairo_translate (cr, gap, 0);
    for (i=0; i < 5; i++) {
	cairo_set_tolerance (cr, tolerance[i]);
	draw_spline (cr, height);
	cairo_translate (cr, gap, 0);
    }
}
@


1.4
log
@
        * Makefile:
        * bevels.c: (set_hex_color), (main):
        * caps_joins.c: (main), (stroke_v_twice), (draw_caps_joins):
        * hering.c: (main), (draw_hering):
        * outline.c: (main), (create_gradient), (draw_outlines):
        * snapping.c: (snap_point_for_fill), (snap_point_for_stroke),
        (snap_line_width), (snap_path_for_fill), (snap_path_for_stroke),
        (draw_nested), (main):
        * spiral.c: (main), (draw_spiral):
        * splines_tolerance.c: (main), (draw_splines):
        * star_and_ring.c: (star_path), (fill_ring), (fill_star), (main):
        * stars.c: (main), (draw_stars):
        * text-rotate.c: (main):
        * text.c: (box_text), (box_glyphs), (main):
        Update all programs to match recent cairo API changes.
@
text
@a29 2
#include "write_png.h"

@


1.3
log
@
        * caps_joins.c:
        * hering.c:
        * outline.c:
        * spiral.c:
        * splines_tolerance.c:
        * stars.c:
        * text-rotate.c:
        * text.c:
        * write_png.c:
        * write_png.h: Convert file encodings to utf-8.
@
text
@d42 1
a42 1
char image[STRIDE*HEIGHT];
d47 1
d50 2
a51 1
    cr = cairo_create ();
d53 1
a53 2
    cairo_set_target_image (cr, image, CAIRO_FORMAT_ARGB32,
		      WIDTH, HEIGHT, STRIDE);
d56 1
a56 1
    cairo_set_rgb_color (cr, 1, 1, 1);
d61 1
a61 1
    write_png_argb32 (image, "splines_tolerance.png", WIDTH, HEIGHT, STRIDE);
d65 2
d90 1
a90 1
    cairo_set_rgb_color (cr, 0, 0, 0);
@


1.2
log
@global replacing of ct with cr
@
text
@d2 1
a2 1
 * Copyright © 2003 USC, Information Sciences Institute
@


1.1
log
@Added demos from OLS paper.
@
text
@d33 1
a33 1
draw_spline (cairo_t *ct, double height);
d36 1
a36 1
draw_splines (cairo_t *ct, int width, int height);
d47 1
a47 1
    cairo_t *ct;
d49 1
a49 1
    ct = cairo_create ();
d51 1
a51 1
    cairo_set_target_image (ct, image, CAIRO_FORMAT_ARGB32,
d54 3
a56 3
    cairo_rectangle (ct, 0, 0, WIDTH, HEIGHT);
    cairo_set_rgb_color (ct, 1, 1, 1);
    cairo_fill (ct);
d58 1
a58 1
    draw_splines (ct, WIDTH, HEIGHT);
d62 1
a62 1
    cairo_destroy (ct);
d68 1
a68 1
draw_spline (cairo_t *ct, double height)
d70 1
a70 1
    cairo_move_to (ct, 0, .1 * height);
d72 1
a72 1
    cairo_rel_curve_to (ct,
d76 1
a76 1
    cairo_stroke (ct);
d80 1
a80 1
draw_splines (cairo_t *ct, int width, int height)
d87 2
a88 2
    cairo_set_rgb_color (ct, 0, 0, 0);
    cairo_set_line_width (ct, line_width);
d90 1
a90 1
    cairo_translate (ct, gap, 0);
d92 3
a94 3
	cairo_set_tolerance (ct, tolerance[i]);
	draw_spline (ct, height);
	cairo_translate (ct, gap, 0);
@