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flower.c

/*
 * Copyright © 2008 Kristian Høgsberg
 *
 * 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 copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS 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.
 */

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <fcntl.h>
#include <unistd.h>
#include <math.h>
#include <time.h>
#include <cairo.h>
#include <sys/time.h>
#include <glib.h>

#include "wayland-client.h"
#include "wayland-glib.h"
#include "window.h"

static void
set_random_color(cairo_t *cr)
{
      cairo_set_source_rgba(cr,
                        0.5 + (random() % 50) / 49.0,
                        0.5 + (random() % 50) / 49.0,
                        0.5 + (random() % 50) / 49.0,
                        0.5 + (random() % 100) / 99.0);
}


static void
draw_stuff(cairo_surface_t *surface, int width, int height)
{
      const int petal_count = 3 + random() % 5;
      const double r1 = 60 + random() % 35;
      const double r2 = 20 + random() % 40;
      const double u = (10 + random() % 90) / 100.0;
      const double v = (random() % 90) / 100.0;

      cairo_t *cr;
      int i;
      double t, dt = 2 * M_PI / (petal_count * 2);
      double x1, y1, x2, y2, x3, y3;

      cr = cairo_create(surface);
      cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
      cairo_set_source_rgba(cr, 0, 0, 0, 0);
      cairo_paint(cr);

      cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
      cairo_translate(cr, width / 2, height / 2);
      cairo_move_to(cr, cos(0) * r1, sin(0) * r1);
      for (t = 0, i = 0; i < petal_count; i++, t += dt * 2) {
            x1 = cos(t) * r1;
            y1 = sin(t) * r1;
            x2 = cos(t + dt) * r2;
            y2 = sin(t + dt) * r2;
            x3 = cos(t + 2 * dt) * r1;
            y3 = sin(t + 2 * dt) * r1;

            cairo_curve_to(cr,
                         x1 - y1 * u, y1 + x1 * u,
                         x2 + y2 * v, y2 - x2 * v,
                         x2, y2);                      

            cairo_curve_to(cr,
                         x2 - y2 * v, y2 + x2 * v,
                         x3 + y3 * u, y3 - x3 * u,
                         x3, y3);
      }

      cairo_close_path(cr);
      set_random_color(cr);
      cairo_fill_preserve(cr);
      set_random_color(cr);
      cairo_stroke(cr);

      cairo_destroy(cr);
}

static int
motion_handler(struct window *window,
             struct input *input, uint32_t time,
             int32_t x, int32_t y,
             int32_t sx, int32_t sy, void *data)
{
      return POINTER_HAND1;
}

static void
button_handler(struct window *window,
             struct input *input, uint32_t time,
             int button, int state, void *data)
{
      if (state)
            window_move(window, input, time);
}

00119 struct flower {
      struct display *display;
      struct window *window;
      int width, height;
};

int main(int argc, char *argv[])
{
      cairo_surface_t *s;
      struct flower flower;
      struct display *d;
      struct timeval tv;

      d = display_create(&argc, &argv, NULL, NULL);
      if (d == NULL) {
            fprintf(stderr, "failed to create display: %m\n");
            return -1;
      }

      gettimeofday(&tv, NULL);
      srandom(tv.tv_usec);

      flower.width = 200;
      flower.height = 200;
      flower.display = d;
      flower.window = window_create(d, flower.width, flower.height);

      window_set_title(flower.window, "flower");
      window_set_decoration(flower.window, 0);
      window_draw(flower.window);
      s = window_get_surface(flower.window);
      if (s == NULL || cairo_surface_status (s) != CAIRO_STATUS_SUCCESS) {
            fprintf(stderr, "failed to create cairo egl surface\n");
            return -1;
      }

      draw_stuff(s, flower.width, flower.height);
      cairo_surface_flush(s);
      cairo_surface_destroy(s);
      window_flush(flower.window);

      window_set_motion_handler(flower.window, motion_handler);
      window_set_button_handler(flower.window, button_handler);
      window_set_user_data(flower.window, &flower);
      display_run(d);

      return 0;
}

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