gtkcolorsel.c

gtk是linux一款强大的夸平台的图形化开发工具

      gdouble c[3];
      guchar rc[3];
      gint i = 0;

      gtk_color_selection_hsv_to_rgb (colorsel->values[HUE],
				      colorsel->values[SATURATION],
				      v,
                                      &c[0], &c[1], &c[2]);

      for (n = 0; n < 3; n++)
	rc[n] = (guchar) (255.0 * c[n]);

      for (x = 0; x < wid; x++)
	{
	  for (n = 0; n < 3; n++)
	    colorsel->value_buf[i++] = rc[n];
	}

      gtk_preview_draw_row (GTK_PREVIEW (colorsel->value_area), colorsel->value_buf, 0, y, wid);
      v -= sv;
    }

  gtk_widget_queue_draw (colorsel->value_area);
}

static void
gtk_color_selection_draw_wheel_frame (GtkColorSelection *colorsel)
{
  GtkStyle *style;
  gint w, h;

  style = gtk_widget_get_style (colorsel->wheel_area);

  w = colorsel->wheel_area->allocation.width;
  h = colorsel->wheel_area->allocation.height;

  gdk_draw_arc (colorsel->wheel_area->window, style->black_gc,
		FALSE, 1, 1, w - 1, h - 1, 30 * 64, 180 * 64);
  gdk_draw_arc (colorsel->wheel_area->window, style->mid_gc[GTK_STATE_NORMAL],
		FALSE, 0, 0, w, h, 30 * 64, 180 * 64);

  gdk_draw_arc (colorsel->wheel_area->window, style->bg_gc[GTK_STATE_NORMAL],
		FALSE, 1, 1, w - 1, h - 1, 210 * 64, 180 * 64);
  gdk_draw_arc (colorsel->wheel_area->window, style->light_gc[GTK_STATE_NORMAL],
		FALSE, 0, 0, w, h, 210 * 64, 180 * 64);
}

static void
gtk_color_selection_draw_wheel (GtkColorSelection *colorsel,
                                gint               resize)
{
  gint x, y, i, wid, heig, n;
  gdouble cx, cy, h, s, c[3];
  guchar bg[3];
  GtkStyle *style = gtk_widget_get_style (colorsel->wheel_area);

  wid = colorsel->wheel_area->allocation.width;
  heig = colorsel->wheel_area->allocation.height;

  if (resize)
    {
      if (colorsel->wheel_buf != NULL)
	g_free (colorsel->wheel_buf);

      colorsel->wheel_buf = g_new(guchar, 3 * wid);
    }

  cx = (gdouble) (wid) / 2.0;
  cy = (gdouble) (heig) / 2.0;

  bg[0] = style->bg[GTK_STATE_NORMAL].red >> 8;
  bg[1] = style->bg[GTK_STATE_NORMAL].green >> 8;
  bg[2] = style->bg[GTK_STATE_NORMAL].blue >> 8;

  for (y = 0; y < heig; y++)
    {
      i = 0;
      for (x = 0; x < wid; x++)
	{
	  if (gtk_color_selection_eval_wheel (x, y, cx, cy, &h, &s))
	    {
	      for (n = 0; n < 3; n++)
		colorsel->wheel_buf[i++] = bg[n];
	    }
	  else
	    {
	      gtk_color_selection_hsv_to_rgb (h, s, 1.0, &c[0], &c[1], &c[2]);
	      for (n = 0; n < 3; n++)
		colorsel->wheel_buf[i++] = (guchar) (255.0 * c[n]);
	    }
	}

      gtk_preview_draw_row (GTK_PREVIEW (colorsel->wheel_area), colorsel->wheel_buf, 0, y, wid);
    }

  if (colorsel->wheel_area->window)
     {
	GdkPixmap *pm = NULL;
	GdkGC     *pmgc = NULL;
	GdkColor   col;
	gint w, h;
	
	pm = gdk_pixmap_new (colorsel->wheel_area->window, wid, heig, 1);
	pmgc = gdk_gc_new (pm);
	
	col.pixel = 0;
	gdk_gc_set_foreground(pmgc, &col);
	gdk_draw_rectangle(pm, pmgc, TRUE, 0, 0, wid, heig);
	col.pixel = 1;
	
	gdk_gc_set_foreground(pmgc, &col);
	gdk_draw_arc (pm, pmgc, TRUE, 0, 0, wid, heig, 0, 360*64);

	w = colorsel->wheel_area->allocation.width;
	h = colorsel->wheel_area->allocation.height;
	
	gdk_draw_arc (pm, pmgc,
		      FALSE, 1, 1, w - 1, h - 1, 30 * 64, 180 * 64);
	gdk_draw_arc (pm, pmgc,
		      FALSE, 0, 0, w, h, 30 * 64, 180 * 64);
	gdk_draw_arc (pm, pmgc,
		      FALSE, 1, 1, w - 1, h - 1, 210 * 64, 180 * 64);
	gdk_draw_arc (pm, pmgc,
		      FALSE, 0, 0, w, h, 210 * 64, 180 * 64);
	gdk_window_shape_combine_mask (colorsel->wheel_area->window, pm, 0, 0);
	gdk_pixmap_unref (pm);
	gdk_gc_destroy (pmgc);
     }
}

static void
gtk_color_selection_draw_sample (GtkColorSelection *colorsel,
                                 gint               resize)
{
  gint x, y, i, wid, heig, f, half, n;
  guchar c[3 * 2], cc[3 * 4], *cp = c;
  gdouble o, oldo;

  wid = colorsel->sample_area->allocation.width;
  heig = colorsel->sample_area->allocation.height;
  half = wid >> 1;

  if (resize)
    {
      if (colorsel->sample_buf != NULL)
	g_free (colorsel->sample_buf);

      colorsel->sample_buf = g_new(guchar, 3 * wid);
    }

  i = RED;
  for (n = 0; n < 3; n++)
    {
      c[n] = (guchar) (255.0 * colorsel->old_values[i]);
      c[n + 3] = (guchar) (255.0 * colorsel->values[i++]);
    }

  if (colorsel->use_opacity)
    {
      o = colorsel->values[OPACITY];
      oldo = colorsel->old_values[OPACITY];

      for (n = 0; n < 3; n++)
	{
	  cc[n] = (guchar) ((1.0 - oldo) * 192 + (oldo * (gdouble) c[n]));
	  cc[n + 3] = (guchar) ((1.0 - oldo) * 128 + (oldo * (gdouble) c[n]));
	  cc[n + 6] = (guchar) ((1.0 - o) * 192 + (o * (gdouble) c[n + 3]));
	  cc[n + 9] = (guchar) ((1.0 - o) * 128 + (o * (gdouble) c[n + 3]));
	}
      cp = cc;
    }

  for (y = 0; y < heig; y++)
    {
      i = 0;
      for (x = 0; x < wid; x++)
	{
	  if (colorsel->use_opacity)
	    {
	      f = 3 * (((x % 32) < 16) ^ ((y % 32) < 16));
	      f += (x > half) * 6;
	    }
	  else
	    f = (x > half) * 3;

	  for (n = 0; n < 3; n++)
	    colorsel->sample_buf[i++] = cp[n + f];
	}

      gtk_preview_draw_row (GTK_PREVIEW (colorsel->sample_area), colorsel->sample_buf, 0, y, wid);
    }

  gtk_widget_queue_draw (colorsel->sample_area);
}

static gint
gtk_color_selection_eval_wheel (gint     x,  gint     y,
				gdouble  cx, gdouble  cy,
				gdouble *h,  gdouble *s)
{
  gdouble r, rx, ry;

  rx = ((gdouble) x - cx);
  ry = ((gdouble) y - cy);

  rx = rx/cx;
  ry = ry/cy;

  r = sqrt (SQR (rx) + SQR (ry));

  if (r != 0.0)
    *h = atan2 (rx / r, ry / r);
  else
    *h = 0.0;

  *s = r;
  *h = 360.0 * (*h) / (2.0 * M_PI) + 180;

  if (*s == 0.0)
    *s = 0.00001;
  else if (*s > 1.0)
    {
      *s = 1.0;
      return TRUE;
    }
  return FALSE;
}

static void
gtk_color_selection_hsv_to_rgb (gdouble  h, gdouble  s, gdouble  v,
				gdouble *r, gdouble *g, gdouble *b)
{
  gint i;
  gdouble f, w, q, t;

  if (s == 0.0)
    s = 0.000001;

  if (h == -1.0)
    {
      *r = v;
      *g = v;
      *b = v;
    }
  else
    {
      if (h == 360.0)
	h = 0.0;
      h = h / 60.0;
      i = (gint) h;
      f = h - i;
      w = v * (1.0 - s);
      q = v * (1.0 - (s * f));
      t = v * (1.0 - (s * (1.0 - f)));

      switch (i)
	{
	case 0:
	  *r = v;
	  *g = t;
	  *b = w;
	  break;
	case 1:
	  *r = q;
	  *g = v;
	  *b = w;
	  break;
	case 2:
	  *r = w;
	  *g = v;
	  *b = t;
	  break;
	case 3:
	  *r = w;
	  *g = q;
	  *b = v;
	  break;
	case 4:
	  *r = t;
	  *g = w;
	  *b = v;
	  break;
	case 5:
	  *r = v;
	  *g = w;
	  *b = q;
	  break;
	}
    }
}

static void
gtk_color_selection_rgb_to_hsv (gdouble  r, gdouble  g, gdouble  b,
				gdouble *h, gdouble *s, gdouble *v)
{
  double max, min, delta;

  max = r;
  if (g > max)
    max = g;
  if (b > max)
    max = b;

  min = r;
  if (g < min)
    min = g;
  if (b < min)
    min = b;

  *v = max;

  if (max != 0.0)
    *s = (max - min) / max;
  else
    *s = 0.0;

  if (*s == 0.0)
    *h = -1.0;
  else
    {
      delta = max - min;

      if (r == max)
	*h = (g - b) / delta;
      else if (g == max)
	*h = 2.0 + (b - r) / delta;
      else if (b == max)
	*h = 4.0 + (r - g) / delta;

      *h = *h * 60.0;

      if (*h < 0.0)
	*h = *h + 360;
    }
}

/***************************/
/* GtkColorSelectionDialog */
/***************************/

GtkType
gtk_color_selection_dialog_get_type (void)
{
  static GtkType color_selection_dialog_type = 0;

  if (!color_selection_dialog_type)
    {
      GtkTypeInfo colorsel_diag_info =
      {
	"GtkColorSelectionDialog",
	sizeof (GtkColorSelectionDialog),
	sizeof (GtkColorSelectionDialogClass),
	(GtkClassInitFunc) gtk_color_selection_dialog_class_init,
	(GtkObjectInitFunc) gtk_color_selection_dialog_init,
	/* reserved_1 */ NULL,
	/* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL,
      };

      color_selection_dialog_type = gtk_type_unique (GTK_TYPE_WINDOW, &colorsel_diag_info);
    }

  return color_selection_dialog_type;
}

static void
gtk_color_selection_dialog_class_init (GtkColorSelectionDialogClass *klass)
{
  GtkObjectClass *object_class;

  object_class = (GtkObjectClass*) klass;

  color_selection_dialog_parent_class = gtk_type_class (GTK_TYPE_WINDOW);
}

static void
gtk_color_selection_dialog_init (GtkColorSelectionDialog *colorseldiag)
{
  GtkWidget *action_area, *frame;

  gtk_widget_set_visual (GTK_WIDGET (colorseldiag), gdk_rgb_get_visual ());
  gtk_widget_set_colormap (GTK_WIDGET (colorseldiag), gdk_rgb_get_cmap ());

  gtk_widget_push_visual (gdk_rgb_get_visual ());
  gtk_widget_push_colormap (gdk_rgb_get_cmap ());

  colorseldiag->main_vbox = gtk_vbox_new (FALSE, 10);
  gtk_container_set_border_width (GTK_CONTAINER (colorseldiag), 10);
  gtk_container_add (GTK_CONTAINER (colorseldiag), colorseldiag->main_vbox);
  gtk_widget_show (colorseldiag->main_vbox);

  frame = gtk_frame_new (NULL);
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
  gtk_container_add (GTK_CONTAINER (colorseldiag->main_vbox), frame);
  gtk_widget_show (frame);

  colorseldiag->colorsel = gtk_color_selection_new ();
  gtk_container_add (GTK_CONTAINER (frame), colorseldiag->colorsel);
  gtk_widget_show (colorseldiag->colorsel);

  action_area = gtk_hbutton_box_new ();
  gtk_button_box_set_layout(GTK_BUTTON_BOX(action_area), GTK_BUTTONBOX_END);
  gtk_button_box_set_spacing(GTK_BUTTON_BOX(action_area), 5);
  gtk_box_pack_end (GTK_BOX (colorseldiag->main_vbox), action_area, FALSE, FALSE, 0);
  gtk_widget_show (action_area);

  colorseldiag->ok_button = gtk_button_new_with_label (_("OK"));
  GTK_WIDGET_SET_FLAGS (colorseldiag->ok_button, GTK_CAN_DEFAULT);
  gtk_box_pack_start (GTK_BOX (action_area), colorseldiag->ok_button, TRUE, TRUE, 0);
  gtk_widget_grab_default (colorseldiag->ok_button);
  gtk_widget_show (colorseldiag->ok_button);

  colorseldiag->cancel_button = gtk_button_new_with_label (_("Cancel"));
  GTK_WIDGET_SET_FLAGS (colorseldiag->cancel_button, GTK_CAN_DEFAULT);
  gtk_box_pack_start (GTK_BOX (action_area), colorseldiag->cancel_button, TRUE, TRUE, 0);
  gtk_widget_show (colorseldiag->cancel_button);

  colorseldiag->help_button = gtk_button_new_with_label (_("Help"));
  GTK_WIDGET_SET_FLAGS (colorseldiag->help_button, GTK_CAN_DEFAULT);
  gtk_box_pack_start (GTK_BOX (action_area), colorseldiag->help_button, TRUE, TRUE, 0);
  gtk_widget_show (colorseldiag->help_button);

  gtk_widget_pop_colormap ();
  gtk_widget_pop_visual ();
}

GtkWidget*
gtk_color_selection_dialog_new (const gchar *title)
{
  GtkColorSelectionDialog *colorseldiag;

  colorseldiag = gtk_type_new (GTK_TYPE_COLOR_SELECTION_DIALOG);
  gtk_window_set_title (GTK_WINDOW (colorseldiag), title);

  return GTK_WIDGET (colorseldiag);
}