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/*
* Copyright © 2004 David Reveman, Peter Nilsson
*
* 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 names of
* David Reveman and Peter Nilsson not be used in advertising or
* publicity pertaining to distribution of the software without
* specific, written prior permission. David Reveman and Peter Nilsson
* makes no representations about the suitability of this software for
* any purpose. It is provided "as is" without express or implied warranty.
*
* DAVID REVEMAN AND PETER NILSSON DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL DAVID REVEMAN AND
* PETER NILSSON 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.
*
* Authors: David Reveman <c99drn@cs.umu.se>
* Peter Nilsson <c99pnn@cs.umu.se>
*/
#include <cairo.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
static float font_scale1, font_scale2,
font_rotate1, font_rotate2,
font_alpha1, font_alpha2,
font_speed1, font_speed2,
font_x1, font_y1,
font_x2, font_y2;
static cairo_surface_t *bg_surface;
static int bg_width, bg_height;
void
text_setup (cairo_surface_t *target, int w, int h)
{
cairo_surface_t *image;
cairo_t *cr;
image = cairo_image_surface_create_from_png ("orion.png");
if (cairo_surface_status (image)) {
printf ("error reading orion.png: %s\n",
cairo_status_to_string (cairo_surface_status (image)));
exit(1);
}
bg_width = cairo_image_surface_get_width (image);
bg_height = cairo_image_surface_get_height (image);
bg_surface = cairo_surface_create_similar (target,
CAIRO_CONTENT_COLOR_ALPHA,
bg_width, bg_height);
cr = cairo_create (bg_surface);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_set_source_surface (cr, image, 0.0, 0.0);
cairo_paint (cr);
cairo_destroy (cr);
cairo_surface_destroy (image);
drand48 ();
drand48 ();
font_rotate1 = (float) (drand48 () * 3.14);
font_rotate2 = (float) (drand48 () * 3.14);
font_scale1 = (float) (drand48 () * 250.0);
font_scale2 = (float) (drand48 () * 250.0);
font_speed1 = (float) (drand48 () + 0.5);
font_speed2 = (float) (drand48 () + 0.5);
font_alpha1 = 0.0;
font_alpha2 = 0.0;
font_x1 = 200.0 + (float) (drand48 () * (w - 200.0));
font_y1 = 100.0 + (float) (drand48 () * (h - 100.0));
font_x2 = 200.0 + (float) (drand48 () * (w - 200.0));
font_y2 = 100.0 + (float) (drand48 () * (h - 100.0));
}
static void
text_path_render_text1 (cairo_t *cr)
{
cairo_save (cr);
cairo_set_source_rgba (cr, 1.0, 0.0, 0.0, font_alpha1);
cairo_set_font_size (cr, font_scale1);
cairo_move_to (cr, font_x1 - font_scale1, font_y1);
cairo_rotate(cr, font_rotate1);
cairo_text_path (cr, "CAIRO");
cairo_fill_preserve (cr);
cairo_set_source_rgba (cr, 0.0, 1.0, 0.0, font_alpha1);
cairo_stroke (cr);
cairo_restore (cr);
}
static void
text_path_render_text2 (cairo_t *cr)
{
cairo_save (cr);
cairo_set_source_rgba (cr, 0.0, 0.0, 1.0, font_alpha2);
cairo_set_font_size (cr, font_scale2);
cairo_move_to (cr, font_x2 - font_scale2, font_y2);
cairo_rotate(cr, font_rotate2);
cairo_text_path (cr, "GEARS");
cairo_fill_preserve (cr);
cairo_set_source_rgba (cr, 0.0, 1.0, 0.0, font_alpha2);
cairo_stroke (cr);
cairo_restore (cr);
}
void
text_render (cairo_t *cr, int w, int h)
{
double scale_x, scale_y;
cairo_select_font_face (cr,
"arial",
CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_BOLD);
cairo_set_font_size (cr, 1.0);
cairo_save (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_move_to (cr, 0, 0);
scale_x = ((double) w) / (double) bg_width;
scale_y = ((double) h) / (double) bg_height;
cairo_scale (cr, scale_x, scale_y);
cairo_set_source_surface (cr, bg_surface, 0.0, 0.0);
cairo_paint (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
if (font_scale1 < font_scale2) {
text_path_render_text1 (cr);
text_path_render_text2 (cr);
} else {
text_path_render_text2 (cr);
text_path_render_text1 (cr);
}
if (font_scale1 > 250) {
font_scale1 = (float) (drand48 () * 50.0);
font_x1 = ((float) (drand48 () * (w - 400.0))) + 200.0;
font_y1 = ((float) (drand48 () * (h - 200.0))) + 100.0;
font_rotate1 = (float) (drand48 () * 3.14);
font_speed1 = (float) (drand48 () * 10.0);
font_alpha1 = 0;
}
if (font_scale2 > 250) {
font_scale2 = (float) (drand48 () * 50.0);
font_x2 = ((float) (drand48 () * (w - 400.0))) + 200.0;
font_y2 = ((float) (drand48 () * (h - 200.0))) + 100.0;
font_rotate2 = (float) (drand48 () * 3.14);
font_speed2 = (float) (drand48 () * 10.0);
font_alpha2 = 0;
}
font_scale1 > 150? font_scale1 += 2: font_scale1++;
font_scale2 > 150? font_scale2 += 2: font_scale2++;
font_scale1 < 175? (font_alpha1 += 0.01): (font_alpha1 -= 0.05);
font_scale2 < 175? (font_alpha2 += 0.01): (font_alpha2 -= 0.05);
font_scale1 += font_speed1;
font_scale2 += font_speed2;
cairo_restore (cr);
}
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