Attachment 47720 Details for Bug 38079 – Example source code

Example source code

cairo-arc.c (text/x-csrc), 2.58 KB, created by Martin Simmons on 2011-06-08 08:42:13 UTC

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Filename:

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Creator: Martin Simmons

Created: 2011-06-08 08:42:13 UTC

Size: 2.58 KB

patch

obsolete

>#include <stdio.h>
>#include <stdlib.h>
>#include <string.h>
>#include <math.h>
>
>#include "gtk/gtk.h"
>
>void add_arc (cairo_t *cr, int sector)
>{
>  cairo_save (cr);
>  cairo_rotate (cr, M_PI*2*sector/6);
>  cairo_new_sub_path (cr);
>  /* An alternative way to generate the same curve
>     cairo_arc (cr, 100, 0, 100, M_PI/2, M_PI); */
>  cairo_move_to (cr, 100, 100);
>  cairo_curve_to (cr, 44.773438, 100.000000, 0.000000, 55.226562, 0.000000, 0.000000);
>  cairo_restore (cr);
>}
>
>void print_path (cairo_t *cr)
>{
>  double x1, y1, x2, y2;
>  cairo_path_t *path;
>  cairo_path_data_t *data;
>  int i;
>
>  printf ("version %s\n", cairo_version_string());
>  cairo_path_extents (cr, &x1, &y1, &x2, &y2);
>  printf ("path extents = %lf %lf %lf %lf\n", x1, y1, x2, y2);
>  path = cairo_copy_path (cr);
>  printf ("path elements(%d):\n", path->num_data);
>  for (i=0; i < path->num_data; i += path->data[i].header.length) {
>    data = &path->data[i];
>    switch (data->header.type) {
>    case CAIRO_PATH_MOVE_TO:
>      printf ("  move_to %lf %lf\n", data[1].point.x, data[1].point.y);
>      break;
>    case CAIRO_PATH_LINE_TO:
>      printf ("  line_to %lf %lf\n", data[1].point.x, data[1].point.y);
>      break;
>    case CAIRO_PATH_CURVE_TO:
>      printf ("  curve_to %lf %lf %lf %lf %lf %lf\n", data[1].point.x, data[1].point.y,
>	      data[2].point.x, data[2].point.y,
>	      data[3].point.x, data[3].point.y);
>      break;
>    case CAIRO_PATH_CLOSE_PATH:
>      printf ("  close_path\n");
>      break;
>    }
>  }
>  cairo_path_destroy (path);
>}
>
>static gboolean
>window_expose_event (GtkWidget *widget,
>                     GdkEventExpose *event)
>{
>  cairo_t *cr;
>
>  cr = gdk_cairo_create (widget->window);
>
>  cairo_set_line_width (cr, 1);
>
>  cairo_set_source_rgb (cr, 0, 0, 0);
>  cairo_translate (cr, 160, 160);
>  add_arc (cr, 0);
>  add_arc (cr, 3); 
>  add_arc (cr, 4);
>  print_path (cr);
>  cairo_stroke (cr);
>
>  cairo_set_source_rgb (cr, 1, 0, 0);
>  cairo_translate (cr, 10, 0);
>  add_arc (cr, 0);
>  cairo_stroke (cr);
>  add_arc (cr, 3);
>  cairo_stroke (cr);
>  add_arc (cr, 4);
>  cairo_stroke (cr);
>
>  /* we're done */
>  cairo_destroy (cr);
>
>  return FALSE;
>}
>
>int
>main (int argc, char **argv)
>{
>  GtkWidget *window;
>
>  gtk_init (&argc, &argv);
>
>  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
>  gtk_widget_set_size_request (window, 320, 320);
>
>  g_signal_connect (window, "destroy",
>		    G_CALLBACK (gtk_main_quit),
>		    NULL);
>  g_signal_connect (window, "delete-event",
>		    G_CALLBACK (gtk_false),
>		    NULL);
>  g_signal_connect_after (window, "expose-event",
>			  G_CALLBACK (window_expose_event), NULL);
>
>  gtk_widget_show_all (window);
>  gtk_main ();
>}

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