gtkhsv.c 36.5 KB
Newer Older
Owen Taylor's avatar
Owen Taylor committed
1 2 3 4 5 6 7 8 9
/* HSV color selector for GTK+
 *
 * Copyright (C) 1999 The Free Software Foundation
 *
 * Authors: Simon Budig <Simon.Budig@unix-ag.org> (original code)
 *          Federico Mena-Quintero <federico@gimp.org> (cleanup for GTK+)
 *          Jonathan Blandford <jrb@redhat.com> (cleanup for GTK+)
 *
 * This library is free software; you can redistribute it and/or
10
 * modify it under the terms of the GNU Lesser General Public
Owen Taylor's avatar
Owen Taylor committed
11 12 13 14 15 16
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17
 * Lesser General Public License for more details.
Owen Taylor's avatar
Owen Taylor committed
18
 *
19
 * You should have received a copy of the GNU Lesser General Public
Owen Taylor's avatar
Owen Taylor committed
20 21 22 23 24 25 26 27
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include <math.h>
#include "gtksignal.h"
#include "gtkhsv.h"
28 29 30
#include "gdk/gdkkeysyms.h"
#include "gtkbindings.h"
#include "gtkcontainer.h"
Owen Taylor's avatar
Owen Taylor committed
31

32 33 34 35 36 37
/*
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
 */
Owen Taylor's avatar
Owen Taylor committed
38 39 40 41 42 43 44 45 46 47

/* Default width/height */
#define DEFAULT_SIZE 100

/* Default ring width */
#define DEFAULT_RING_WIDTH 10


/* Dragging modes */
typedef enum {
48 49 50
  DRAG_NONE,
  DRAG_H,
  DRAG_SV
Owen Taylor's avatar
Owen Taylor committed
51 52 53 54
} DragMode;

/* Private part of the GtkHSV structure */
typedef struct {
55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
  /* Color value */
  double h;
  double s;
  double v;
  
  /* Size and ring width */
  int size;
  int ring_width;
  
  /* Window for capturing events */
  GdkWindow *window;
  
  /* GC for drawing */
  GdkGC *gc;
  
  /* Dragging mode */
  DragMode mode;
72 73 74

  guint focus_on_ring : 1;
  
Owen Taylor's avatar
Owen Taylor committed
75 76 77 78 79 80 81
} HSVPrivate;



/* Signal IDs */

enum {
82
  CHANGED,
83
  MOVE,
84
  LAST_SIGNAL
Owen Taylor's avatar
Owen Taylor committed
85 86
};

87 88 89
static void gtk_hsv_class_init     (GtkHSVClass    *class);
static void gtk_hsv_init           (GtkHSV         *hsv);
static void gtk_hsv_destroy        (GtkObject      *object);
90 91
static void gtk_hsv_map            (GtkWidget      *widget);
static void gtk_hsv_unmap          (GtkWidget      *widget);
92 93 94 95 96 97 98 99 100 101 102 103 104 105
static void gtk_hsv_realize        (GtkWidget      *widget);
static void gtk_hsv_unrealize      (GtkWidget      *widget);
static void gtk_hsv_size_request   (GtkWidget      *widget,
				    GtkRequisition *requisition);
static void gtk_hsv_size_allocate  (GtkWidget      *widget,
				    GtkAllocation  *allocation);
static gint gtk_hsv_button_press   (GtkWidget      *widget,
				    GdkEventButton *event);
static gint gtk_hsv_button_release (GtkWidget      *widget,
				    GdkEventButton *event);
static gint gtk_hsv_motion         (GtkWidget      *widget,
				    GdkEventMotion *event);
static gint gtk_hsv_expose         (GtkWidget      *widget,
				    GdkEventExpose *event);
106
static gboolean gtk_hsv_focus      (GtkWidget       *widget,
107 108 109 110
                                    GtkDirectionType direction);

static void gtk_hsv_move           (GtkHSV          *hsv,
                                    GtkDirectionType dir);
Owen Taylor's avatar
Owen Taylor committed
111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127

static guint hsv_signals[LAST_SIGNAL];
static GtkWidgetClass *parent_class;


/**
 * gtk_hsv_get_type:
 * @void:
 *
 * Registers the &GtkHSV class if necessary, and returns the type ID associated
 * to it.
 *
 * Return value: The type ID of the &GtkHSV class.
 **/
GtkType
gtk_hsv_get_type (void)
{
128 129 130 131 132 133 134 135 136 137 138 139 140 141
  static GtkType hsv_type = 0;
  
  if (!hsv_type) {
    static const GtkTypeInfo hsv_info = {
      "GtkHSV",
      sizeof (GtkHSV),
      sizeof (GtkHSVClass),
      (GtkClassInitFunc) gtk_hsv_class_init,
      (GtkObjectInitFunc) gtk_hsv_init,
      NULL, /* reserved_1 */
      NULL, /* reserved_2 */
      (GtkClassInitFunc) NULL
    };
    
142
    hsv_type = gtk_type_unique (GTK_TYPE_WIDGET, &hsv_info);
143 144 145
  }
  
  return hsv_type;
Owen Taylor's avatar
Owen Taylor committed
146 147 148 149 150 151
}

/* Class initialization function for the HSV color selector */
static void
gtk_hsv_class_init (GtkHSVClass *class)
{
152 153
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
154 155
  GtkHSVClass    *hsv_class;
  GtkBindingSet *binding_set;
156 157 158
  
  object_class = (GtkObjectClass *) class;
  widget_class = (GtkWidgetClass *) class;
159
  hsv_class = GTK_HSV_CLASS (class);
160
  
161
  parent_class = gtk_type_class (GTK_TYPE_WIDGET);  
162 163 164
  
  object_class->destroy = gtk_hsv_destroy;
  
165 166
  widget_class->map = gtk_hsv_map;
  widget_class->unmap = gtk_hsv_unmap;                                      
167 168 169 170 171 172 173 174
  widget_class->realize = gtk_hsv_realize;
  widget_class->unrealize = gtk_hsv_unrealize;
  widget_class->size_request = gtk_hsv_size_request;
  widget_class->size_allocate = gtk_hsv_size_allocate;
  widget_class->button_press_event = gtk_hsv_button_press;
  widget_class->button_release_event = gtk_hsv_button_release;
  widget_class->motion_notify_event = gtk_hsv_motion;
  widget_class->expose_event = gtk_hsv_expose;
175
  widget_class->focus = gtk_hsv_focus;
176 177 178
  
  hsv_class->move = gtk_hsv_move;
  
179 180 181 182 183 184 185
  hsv_signals[CHANGED] =
    gtk_signal_new ("changed",
		    GTK_RUN_FIRST,
		    GTK_CLASS_TYPE (object_class),
		    GTK_SIGNAL_OFFSET (GtkHSVClass, changed),
		    gtk_marshal_VOID__VOID,
		    GTK_TYPE_NONE, 0);
186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224

  hsv_signals[MOVE] =
    gtk_signal_new ("move",
		    GTK_RUN_LAST | GTK_RUN_ACTION,
		    GTK_CLASS_TYPE (object_class),
		    GTK_SIGNAL_OFFSET (GtkHSVClass, move),
		    gtk_marshal_VOID__ENUM,
		    GTK_TYPE_NONE, 1, GTK_TYPE_DIRECTION_TYPE);

  binding_set = gtk_binding_set_by_class (class);

  gtk_binding_entry_add_signal (binding_set, GDK_Up, 0,
                                "move", 1,
                                GTK_TYPE_ENUM, GTK_DIR_UP);
  gtk_binding_entry_add_signal (binding_set, GDK_KP_Up, 0,
                                "move", 1,
                                GTK_TYPE_ENUM, GTK_DIR_UP);
  
  gtk_binding_entry_add_signal (binding_set, GDK_Down, 0,
                                "move", 1,
                                GTK_TYPE_ENUM, GTK_DIR_DOWN);
  gtk_binding_entry_add_signal (binding_set, GDK_KP_Down, 0,
                                "move", 1,
                                GTK_TYPE_ENUM, GTK_DIR_DOWN);

  
  gtk_binding_entry_add_signal (binding_set, GDK_Right, 0,
                                "move", 1,
                                GTK_TYPE_ENUM, GTK_DIR_RIGHT);
  gtk_binding_entry_add_signal (binding_set, GDK_KP_Right, 0,
                                "move", 1,
                                GTK_TYPE_ENUM, GTK_DIR_RIGHT);
  
  gtk_binding_entry_add_signal (binding_set, GDK_Left, 0,
                                "move", 1,
                                GTK_TYPE_ENUM, GTK_DIR_LEFT);
  gtk_binding_entry_add_signal (binding_set, GDK_KP_Left, 0,
                                "move", 1,
                                GTK_TYPE_ENUM, GTK_DIR_LEFT);
Owen Taylor's avatar
Owen Taylor committed
225 226 227 228 229 230
}

/* Object initialization function for the HSV color selector */
static void
gtk_hsv_init (GtkHSV *hsv)
{
231 232 233 234 235 236
  HSVPrivate *priv;
  
  priv = g_new0 (HSVPrivate, 1);
  hsv->priv = priv;
  
  GTK_WIDGET_SET_FLAGS (hsv, GTK_NO_WINDOW);
237
  GTK_WIDGET_SET_FLAGS (hsv, GTK_CAN_FOCUS);
238 239 240 241 242 243 244
  
  priv->h = 0.0;
  priv->s = 0.0;
  priv->v = 0.0;
  
  priv->size = DEFAULT_SIZE;
  priv->ring_width = DEFAULT_RING_WIDTH;
Owen Taylor's avatar
Owen Taylor committed
245 246 247 248 249 250
}

/* Destroy handler for the HSV color selector */
static void
gtk_hsv_destroy (GtkObject *object)
{
251 252 253 254 255 256 257 258 259 260 261 262 263
  GtkHSV *hsv;
  
  g_return_if_fail (GTK_IS_HSV (object));
  
  hsv = GTK_HSV (object);

  if (hsv->priv)
    {
      g_free (hsv->priv);
      hsv->priv = NULL;
    }

  GTK_OBJECT_CLASS (parent_class)->destroy (object);
Owen Taylor's avatar
Owen Taylor committed
264 265 266 267
}

/* Default signal handlers */

268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300
    
/* Map handler for the HSV color selector */

static void
gtk_hsv_map (GtkWidget *widget)
{
  GtkHSV *hsv;
  HSVPrivate *priv;

  hsv = GTK_HSV (widget);
  priv = hsv->priv;

  GTK_WIDGET_CLASS (parent_class)->map (widget);

  gdk_window_show (priv->window);
}

/* Unmap handler for the HSV color selector */

static void
gtk_hsv_unmap (GtkWidget *widget)
{
  GtkHSV *hsv;
  HSVPrivate *priv;

  hsv = GTK_HSV (widget);
  priv = hsv->priv;

  gdk_window_hide (priv->window);

  GTK_WIDGET_CLASS (parent_class)->unmap (widget);
}                                                                           
                                      
Owen Taylor's avatar
Owen Taylor committed
301 302 303 304
/* Realize handler for the HSV color selector */
static void
gtk_hsv_realize (GtkWidget *widget)
{
305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324
  GtkHSV *hsv;
  HSVPrivate *priv;
  GdkWindowAttr attr;
  int attr_mask;
  GdkWindow *parent_window;
  
  hsv = GTK_HSV (widget);
  priv = hsv->priv;
  
  GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
  
  /* Create window */
  
  attr.window_type = GDK_WINDOW_CHILD;
  attr.x = widget->allocation.x;
  attr.y = widget->allocation.y;
  attr.width = widget->allocation.width;
  attr.height = widget->allocation.height;
  attr.wclass = GDK_INPUT_ONLY;
  attr.event_mask = gtk_widget_get_events (widget);
325 326
  attr.event_mask |= (GDK_KEY_PRESS_MASK
                      | GDK_BUTTON_PRESS_MASK
327
		      | GDK_BUTTON_RELEASE_MASK
328 329 330
		      | GDK_POINTER_MOTION_MASK
                      | GDK_ENTER_NOTIFY_MASK
                      | GDK_LEAVE_NOTIFY_MASK);
331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346
  
  attr_mask = GDK_WA_X | GDK_WA_Y;
  
  parent_window = gtk_widget_get_parent_window (widget);
  
  widget->window = parent_window;
  gdk_window_ref (widget->window);
  
  priv->window = gdk_window_new (parent_window, &attr, attr_mask);
  gdk_window_set_user_data (priv->window, hsv);
  
  widget->style = gtk_style_attach (widget->style, widget->window);
  
  /* Create GC */
  
  priv->gc = gdk_gc_new (parent_window);
Owen Taylor's avatar
Owen Taylor committed
347 348 349 350 351 352
}

/* Unrealize handler for the HSV color selector */
static void
gtk_hsv_unrealize (GtkWidget *widget)
{
353 354 355 356 357 358 359 360 361 362 363 364 365 366 367
  GtkHSV *hsv;
  HSVPrivate *priv;
  
  hsv = GTK_HSV (widget);
  priv = hsv->priv;
  
  gdk_window_set_user_data (priv->window, NULL);
  gdk_window_destroy (priv->window);
  priv->window = NULL;
  
  gdk_gc_unref (priv->gc);
  priv->gc = NULL;
  
  if (GTK_WIDGET_CLASS (parent_class)->unrealize)
    GTK_WIDGET_CLASS (parent_class)->unrealize (widget);
Owen Taylor's avatar
Owen Taylor committed
368 369 370 371
}

/* Size_request handler for the HSV color selector */
static void
372 373
gtk_hsv_size_request (GtkWidget      *widget,
		      GtkRequisition *requisition)
Owen Taylor's avatar
Owen Taylor committed
374
{
375 376 377 378 379 380 381 382
  GtkHSV *hsv;
  HSVPrivate *priv;
  
  hsv = GTK_HSV (widget);
  priv = hsv->priv;
  
  requisition->width = priv->size;
  requisition->height = priv->size;
Owen Taylor's avatar
Owen Taylor committed
383 384 385 386
}

/* Size_allocate handler for the HSV color selector */
static void
387 388
gtk_hsv_size_allocate (GtkWidget     *widget,
		       GtkAllocation *allocation)
Owen Taylor's avatar
Owen Taylor committed
389
{
390 391 392 393 394 395 396 397 398 399 400 401 402 403
  GtkHSV *hsv;
  HSVPrivate *priv;
  
  hsv = GTK_HSV (widget);
  priv = hsv->priv;
  
  widget->allocation = *allocation;
  
  if (GTK_WIDGET_REALIZED (widget))
    gdk_window_move_resize (priv->window,
			    allocation->x,
			    allocation->y,
			    allocation->width,
			    allocation->height);
Owen Taylor's avatar
Owen Taylor committed
404 405 406 407 408 409 410 411 412
}


/* Utility functions */

#define INTENSITY(r, g, b) ((r) * 0.30 + (g) * 0.59 + (b) * 0.11)

/* Converts from HSV to RGB */
static void
413 414 415
hsv_to_rgb (gdouble *h,
	    gdouble *s,
	    gdouble *v)
Owen Taylor's avatar
Owen Taylor committed
416
{
417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479
  gdouble hue, saturation, value;
  gdouble f, p, q, t;
  
  if (*s == 0.0)
    {
      *h = *v;
      *s = *v;
      *v = *v; /* heh */
    }
  else
    {
      hue = *h * 6.0;
      saturation = *s;
      value = *v;
      
      if (hue == 6.0)
	hue = 0.0;
      
      f = hue - (int) hue;
      p = value * (1.0 - saturation);
      q = value * (1.0 - saturation * f);
      t = value * (1.0 - saturation * (1.0 - f));
      
      switch ((int) hue)
	{
	case 0:
	  *h = value;
	  *s = t;
	  *v = p;
	  break;
	  
	case 1:
	  *h = q;
	  *s = value;
	  *v = p;
	  break;
	  
	case 2:
	  *h = p;
	  *s = value;
	  *v = t;
	  break;
	  
	case 3:
	  *h = p;
	  *s = q;
	  *v = value;
	  break;
	  
	case 4:
	  *h = t;
	  *s = p;
	  *v = value;
	  break;
	  
	case 5:
	  *h = value;
	  *s = p;
	  *v = q;
	  break;
	  
	default:
	  g_assert_not_reached ();
Owen Taylor's avatar
Owen Taylor committed
480
	}
481
    }
Owen Taylor's avatar
Owen Taylor committed
482 483 484 485
}

/* Converts from RGB to HSV */
static void
486 487 488
rgb_to_hsv (gdouble *r,
	    gdouble *g,
	    gdouble *b)
Owen Taylor's avatar
Owen Taylor committed
489
{
490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556
  gdouble red, green, blue;
  gdouble h, s, v;
  gdouble min, max;
  gdouble delta;
  
  red = *r;
  green = *g;
  blue = *b;
  
  h = 0.0;
  
  if (red > green)
    {
      if (red > blue)
	max = red;
      else
	max = blue;
      
      if (green < blue)
	min = green;
      else
	min = blue;
    }
  else
    {
      if (green > blue)
	max = green;
      else
	max = blue;
      
      if (red < blue)
	min = red;
      else
	min = blue;
    }
  
  v = max;
  
  if (max != 0.0)
    s = (max - min) / max;
  else
    s = 0.0;
  
  if (s == 0.0)
    h = 0.0;
  else
    {
      delta = max - min;
      
      if (red == max)
	h = (green - blue) / delta;
      else if (green == max)
	h = 2 + (blue - red) / delta;
      else if (blue == max)
	h = 4 + (red - green) / delta;
      
      h /= 6.0;
      
      if (h < 0.0)
	h += 1.0;
      else if (h > 1.0)
	h -= 1.0;
    }
  
  *r = h;
  *g = s;
  *b = v;
Owen Taylor's avatar
Owen Taylor committed
557 558 559 560
}

/* Computes the vertices of the saturation/value triangle */
static void
561 562 563 564 565 566 567
compute_triangle (GtkHSV *hsv,
		  gint   *hx,
		  gint   *hy,
		  gint   *sx,
		  gint   *sy,
		  gint   *vx,
		  gint   *vy)
Owen Taylor's avatar
Owen Taylor committed
568
{
569 570 571 572 573 574 575 576 577 578
  HSVPrivate *priv;
  gdouble center;
  gdouble inner, outer;
  gdouble angle;
  
  priv = hsv->priv;
  
  center = priv->size / 2.0;
  outer = priv->size / 2.0;
  inner = outer - priv->ring_width;
579
  angle = priv->h * 2.0 * G_PI;
580 581 582
  
  *hx = floor (center + cos (angle) * inner + 0.5);
  *hy = floor (center - sin (angle) * inner + 0.5);
583 584 585 586
  *sx = floor (center + cos (angle + 2.0 * G_PI / 3.0) * inner + 0.5);
  *sy = floor (center - sin (angle + 2.0 * G_PI / 3.0) * inner + 0.5);
  *vx = floor (center + cos (angle + 4.0 * G_PI / 3.0) * inner + 0.5);
  *vy = floor (center - sin (angle + 4.0 * G_PI / 3.0) * inner + 0.5);
Owen Taylor's avatar
Owen Taylor committed
587 588 589 590
}

/* Computes whether a point is inside the hue ring */
static gboolean
591 592 593
is_in_ring (GtkHSV *hsv,
	    gdouble x,
	    gdouble y)
Owen Taylor's avatar
Owen Taylor committed
594
{
595 596 597 598 599 600 601 602 603 604 605 606 607 608 609
  HSVPrivate *priv;
  gdouble dx, dy, dist;
  gdouble center, inner, outer;
  
  priv = hsv->priv;
  
  center = priv->size / 2.0;
  outer = priv->size / 2.0;
  inner = outer - priv->ring_width;
  
  dx = x - center;
  dy = center - y;
  dist = dx * dx + dy * dy;
  
  return (dist >= inner * inner && dist <= outer * outer);
Owen Taylor's avatar
Owen Taylor committed
610 611 612 613
}

/* Computes a saturation/value pair based on the mouse coordinates */
static void
614 615 616 617 618
compute_sv (GtkHSV  *hsv,
	    gdouble  x,
	    gdouble  y,
	    gdouble *s,
	    gdouble *v)
Owen Taylor's avatar
Owen Taylor committed
619
{
620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684
  HSVPrivate *priv;
  int ihx, ihy, isx, isy, ivx, ivy;
  double hx, hy, sx, sy, vx, vy;
  double center;
  
  priv = hsv->priv;
  
  compute_triangle (hsv, &ihx, &ihy, &isx, &isy, &ivx, &ivy);
  center = priv->size / 2.0;
  hx = ihx - center;
  hy = center - ihy;
  sx = isx - center;
  sy = center - isy;
  vx = ivx - center;
  vy = center - ivy;
  x -= center;
  y = center - y;
  
  if (vx * (x - sx) + vy * (y - sy) < 0.0)
    {
      *s = 1.0;
      *v = (((x - sx) * (hx - sx) + (y - sy) * (hy-sy))
	    / ((hx - sx) * (hx - sx) + (hy - sy) * (hy - sy)));
      
      if (*v < 0.0)
	*v = 0.0;
      else if (*v > 1.0)
	*v = 1.0;
    }
  else if (hx * (x - sx) + hy * (y - sy) < 0.0)
    {
      *s = 0.0;
      *v = (((x - sx) * (vx - sx) + (y - sy) * (vy - sy))
	    / ((vx - sx) * (vx - sx) + (vy - sy) * (vy - sy)));
      
      if (*v < 0.0)
	*v = 0.0;
      else if (*v > 1.0)
	*v = 1.0;
    }
  else if (sx * (x - hx) + sy * (y - hy) < 0.0)
    {
      *v = 1.0;
      *s = (((x - vx) * (hx - vx) + (y - vy) * (hy - vy)) /
	    ((hx - vx) * (hx - vx) + (hy - vy) * (hy - vy)));
      
      if (*s < 0.0)
	*s = 0.0;
      else if (*s > 1.0)
	*s = 1.0;
    }
  else
    {
      *v = (((x - sx) * (hy - vy) - (y - sy) * (hx - vx))
	    / ((vx - sx) * (hy - vy) - (vy - sy) * (hx - vx)));
      
      if (*v<= 0.0)
	{
	  *v = 0.0;
	  *s = 0.0;
	}
      else
	{
	  if (*v > 1.0)
	    *v = 1.0;
685 686 687 688 689 690

	  if (fabs (hy - vy) < fabs (hx - vx))
	    *s = (x - sx - *v * (vx - sx)) / (*v * (hx - vx));
	  else
	    *s = (y - sy - *v * (vy - sy)) / (*v * (hy - vy));
	    
691 692 693 694
	  if (*s < 0.0)
	    *s = 0.0;
	  else if (*s > 1.0)
	    *s = 1.0;
Owen Taylor's avatar
Owen Taylor committed
695
	}
696
    }
Owen Taylor's avatar
Owen Taylor committed
697 698 699 700
}

/* Computes whether a point is inside the saturation/value triangle */
static gboolean
701 702 703
is_in_triangle (GtkHSV *hsv,
		gdouble x,
		gdouble y)
Owen Taylor's avatar
Owen Taylor committed
704
{
705 706 707 708 709 710 711 712 713 714 715
  int hx, hy, sx, sy, vx, vy;
  double det, s, v;
  
  compute_triangle (hsv, &hx, &hy, &sx, &sy, &vx, &vy);
  
  det = (vx - sx) * (hy - sy) - (vy - sy) * (hx - sx);
  
  s = ((x - sx) * (hy - sy) - (y - sy) * (hx - sx)) / det;
  v = ((vx - sx) * (y - sy) - (vy - sy) * (x - sx)) / det;
  
  return (s >= 0.0 && v >= 0.0 && s + v <= 1.0);
Owen Taylor's avatar
Owen Taylor committed
716 717 718 719
}

/* Computes a value based on the mouse coordinates */
static double
720 721 722
compute_v (GtkHSV *hsv,
	   gdouble x,
	   gdouble y)
Owen Taylor's avatar
Owen Taylor committed
723
{
724 725 726 727 728 729 730 731 732 733 734 735 736
  HSVPrivate *priv;
  double center;
  double dx, dy;
  double angle;
  
  priv = hsv->priv;
  
  center = priv->size / 2.0;
  dx = x - center;
  dy = center - y;
  
  angle = atan2 (dy, dx);
  if (angle < 0.0)
737
    angle += 2.0 * G_PI;
738
  
739
  return angle / (2.0 * G_PI);
Owen Taylor's avatar
Owen Taylor committed
740 741 742 743 744
}

/* Event handlers */

static void
745 746
set_cross_grab (GtkHSV *hsv,
		guint32 time)
Owen Taylor's avatar
Owen Taylor committed
747
{
748 749 750 751 752 753 754 755 756 757 758 759 760 761
  HSVPrivate *priv;
  GdkCursor *cursor;
  
  priv = hsv->priv;
  
  cursor = gdk_cursor_new (GDK_CROSSHAIR);
  gdk_pointer_grab (priv->window, FALSE,
		    (GDK_POINTER_MOTION_MASK
		     | GDK_POINTER_MOTION_HINT_MASK
		     | GDK_BUTTON_RELEASE_MASK),
		    NULL,
		    cursor,
		    time);
  gdk_cursor_destroy (cursor);
Owen Taylor's avatar
Owen Taylor committed
762 763 764 765
}

/* Button_press_event handler for the HSV color selector */
static gint
766 767
gtk_hsv_button_press (GtkWidget      *widget,
		      GdkEventButton *event)
Owen Taylor's avatar
Owen Taylor committed
768
{
769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790
  GtkHSV *hsv;
  HSVPrivate *priv;
  double x, y;
  
  hsv = GTK_HSV (widget);
  priv = hsv->priv;
  
  if (priv->mode != DRAG_NONE || event->button != 1)
    return FALSE;
  
  x = event->x;
  y = event->y;
  
  if (is_in_ring (hsv, x, y))
    {
      priv->mode = DRAG_H;
      set_cross_grab (hsv, event->time);
      
      gtk_hsv_set_color (hsv,
			 compute_v (hsv, x, y),
			 priv->s,
			 priv->v);
791 792 793

      gtk_widget_grab_focus (widget);
      priv->focus_on_ring = TRUE;
794 795 796 797 798 799 800 801 802 803 804 805 806
      
      return TRUE;
    }
  
  if (is_in_triangle (hsv, x, y))
    {
      gdouble s, v;
      
      priv->mode = DRAG_SV;
      set_cross_grab (hsv, event->time);
      
      compute_sv (hsv, x, y, &s, &v);
      gtk_hsv_set_color (hsv, priv->h, s, v);
807 808 809 810

      gtk_widget_grab_focus (widget);
      priv->focus_on_ring = FALSE;
      
811 812 813 814
      return TRUE;
    }
  
  return FALSE;
Owen Taylor's avatar
Owen Taylor committed
815 816 817 818
}

/* Button_release_event handler for the HSV color selector */
static gint
819 820
gtk_hsv_button_release (GtkWidget      *widget,
			GdkEventButton *event)
Owen Taylor's avatar
Owen Taylor committed
821
{
822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855
  GtkHSV *hsv;
  HSVPrivate *priv;
  DragMode mode;
  gdouble x, y;
  
  hsv = GTK_HSV (widget);
  priv = hsv->priv;
  
  if (priv->mode == DRAG_NONE || event->button != 1)
    return FALSE;
  
  /* Set the drag mode to DRAG_NONE so that signal handlers for "catched"
   * can see that this is the final color state.
   */
  
  mode = priv->mode;
  priv->mode = DRAG_NONE;
  
  x = event->x;
  y = event->y;
  
  if (mode == DRAG_H)
    gtk_hsv_set_color (hsv, compute_v (hsv, x, y), priv->s, priv->v);
  else if (mode == DRAG_SV) {
    double s, v;
    
    compute_sv (hsv, x, y, &s, &v);
    gtk_hsv_set_color (hsv, priv->h, s, v);
  } else
    g_assert_not_reached ();
  
  gdk_pointer_ungrab (event->time);
  
  return TRUE;
Owen Taylor's avatar
Owen Taylor committed
856 857 858 859
}

/* Motion_notify_event handler for the HSV color selector */
static gint
860 861
gtk_hsv_motion (GtkWidget      *widget,
		GdkEventMotion *event)
Owen Taylor's avatar
Owen Taylor committed
862
{
863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902
  GtkHSV *hsv;
  HSVPrivate *priv;
  double x, y;
  gint ix, iy;
  GdkModifierType mods;
  
  hsv = GTK_HSV (widget);
  priv = hsv->priv;
  
  if (priv->mode == DRAG_NONE)
    return FALSE;
  
  if (event->is_hint)
    {
      gdk_window_get_pointer (priv->window, &ix, &iy, &mods);
      x = ix;
      y = iy;
    }
  else
    {
      x = event->x;
      y = event->y;
    }
  
  if (priv->mode == DRAG_H)
    {
      gtk_hsv_set_color (hsv, compute_v (hsv, x, y), priv->s, priv->v);
      return TRUE;
    }
  else if (priv->mode == DRAG_SV)
    {
      double s, v;
      
      compute_sv (hsv, x, y, &s, &v);
      gtk_hsv_set_color (hsv, priv->h, s, v);
      return TRUE;
    }
  
  g_assert_not_reached ();
  return FALSE;
Owen Taylor's avatar
Owen Taylor committed
903 904 905 906 907 908 909
}


/* Redrawing */

/* Paints the hue ring */
static void
910 911 912 913 914 915
paint_ring (GtkHSV      *hsv,
	    GdkDrawable *drawable,
	    gint         x,
	    gint         y,
	    gint         width,
	    gint         height)
Owen Taylor's avatar
Owen Taylor committed
916
{
917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951
  HSVPrivate *priv;
  int xx, yy;
  gdouble dx, dy, dist;
  gdouble center;
  gdouble inner, outer;
  guchar *buf, *p;
  gdouble angle;
  gdouble hue;
  gdouble r, g, b;
  GdkBitmap *mask;
  GdkGC *gc;
  GdkColor color;
  
  priv = hsv->priv;
  
  center = priv->size / 2.0;
  
  outer = priv->size / 2.0;
  inner = outer - priv->ring_width;
  
  /* Paint the ring */
  
  buf = g_new (guchar, width * height * 3);
  
  for (yy = 0; yy < height; yy++)
    {
      p = buf + yy * width * 3;
      
      dy = -(yy + y - center);
      
      for (xx = 0; xx < width; xx++)
	{
	  dx = xx + x - center;
	  
	  dist = dx * dx + dy * dy;
952
	  if (dist < ((inner-1) * (inner-1)) || dist > ((outer+1) * (outer+1)))
953 954 955 956 957 958 959 960 961
	    {
	      *p++ = 0;
	      *p++ = 0;
	      *p++ = 0;
	      continue;
	    }
	  
	  angle = atan2 (dy, dx);
	  if (angle < 0.0)
962
	    angle += 2.0 * G_PI;
963
	  
964
	  hue = angle / (2.0 * G_PI);
965 966 967 968 969 970 971 972 973
	  
	  r = hue;
	  g = 1.0;
	  b = 1.0;
	  hsv_to_rgb (&r, &g, &b);
	  
	  *p++ = floor (r * 255 + 0.5);
	  *p++ = floor (g * 255 + 0.5);
	  *p++ = floor (b * 255 + 0.5);
Owen Taylor's avatar
Owen Taylor committed
974
	}
975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028
    }
  
  /* Create clipping mask */
  
  mask = gdk_pixmap_new (NULL, width, height, 1);
  gc = gdk_gc_new (mask);
  
  color.pixel = 0;
  gdk_gc_set_foreground (gc, &color);
  gdk_draw_rectangle (mask, gc, TRUE,
		      0, 0, width, height);
  
  
  color.pixel = 1;
  gdk_gc_set_foreground (gc, &color);
  gdk_draw_arc (mask, gc, TRUE,
		-x, -y,
		priv->size - 1, priv->size - 1,
		0, 360 * 64);
  
  color.pixel = 0;
  gdk_gc_set_foreground (gc, &color);
  gdk_draw_arc (mask, gc, TRUE,
		-x + priv->ring_width - 1, -y + priv->ring_width - 1,
		priv->size - 2 * priv->ring_width + 1, priv->size - 2 * priv->ring_width + 1,
		0, 360 * 64);
  
  gdk_gc_unref (gc);
  
  gdk_gc_set_clip_mask (priv->gc, mask);
  gdk_gc_set_clip_origin (priv->gc, 0, 0);
  
  /* Draw ring */
  
  gdk_draw_rgb_image_dithalign (drawable, priv->gc, 0, 0, width, height,
				GDK_RGB_DITHER_MAX,
				buf,
				width * 3,
				x, y);
  
  /* Draw value marker */
  
  r = priv->h;
  g = 1.0;
  b = 1.0;
  hsv_to_rgb (&r, &g, &b);
  
  if (INTENSITY (r, g, b) > 0.5)
    gdk_rgb_gc_set_foreground (priv->gc, 0x000000);
  else
    gdk_rgb_gc_set_foreground (priv->gc, 0xffffff);
  
  gdk_draw_line (drawable, priv->gc,
		 -x + center, -y + center,
1029 1030
		 -x + center + cos (priv->h * 2.0 * G_PI) * center,
		 -y + center - sin (priv->h * 2.0 * G_PI) * center);
1031 1032 1033 1034 1035 1036 1037
  
  gdk_gc_set_clip_mask (priv->gc, NULL);
  gdk_bitmap_unref (mask);
  
  g_free (buf);
  
  /* Draw ring outline */
1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052

  if (GTK_WIDGET_HAS_FOCUS (hsv) &&
      priv->focus_on_ring)
    {
      gdk_rgb_gc_set_foreground (priv->gc, 0x000000);
      
      gdk_draw_arc (drawable, priv->gc, FALSE,
                    -x, -y,
                    priv->size - 1, priv->size - 1,
                    0, 360 * 64);
      gdk_draw_arc (drawable, priv->gc, FALSE,
                    -x + priv->ring_width - 1, -y + priv->ring_width - 1,
                    priv->size - 2 * priv->ring_width + 1, priv->size - 2 * priv->ring_width + 1,
                    0, 360 * 64);
    }
Owen Taylor's avatar
Owen Taylor committed
1053 1054 1055 1056
}

/* Converts an HSV triplet to an integer RGB triplet */
static void
1057 1058 1059 1060 1061 1062
get_color (gdouble h,
	   gdouble s,
	   gdouble v,
	   gint   *r,
	   gint   *g,
	   gint   *b)
Owen Taylor's avatar
Owen Taylor committed
1063
{
1064 1065 1066 1067 1068
  hsv_to_rgb (&h, &s, &v);
  
  *r = floor (h * 255 + 0.5);
  *g = floor (s * 255 + 0.5);
  *b = floor (v * 255 + 0.5);
Owen Taylor's avatar
Owen Taylor committed
1069 1070 1071 1072 1073 1074 1075 1076 1077 1078
}

#define SWAP(a, b, t) ((t) = (a), (a) = (b), (b) = (t))

#define LERP(a, b, v1, v2, i) (((v2) - (v1) != 0)					\
			       ? ((a) + ((b) - (a)) * ((i) - (v1)) / ((v2) - (v1)))	\
			       : (a))

/* Paints the HSV triangle */
static void
1079 1080 1081 1082 1083 1084
paint_triangle (GtkHSV      *hsv,
		GdkDrawable *drawable,
		gint         x,
		gint         y,
		gint         width,
		gint         height)
Owen Taylor's avatar
Owen Taylor committed
1085
{
1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169
  HSVPrivate *priv;
  gint hx, hy, sx, sy, vx, vy; /* HSV vertices */
  gint x1, y1, r1, g1, b1; /* First vertex in scanline order */
  gint x2, y2, r2, g2, b2; /* Second vertex */
  gint x3, y3, r3, g3, b3; /* Third vertex */
  gint t;
  guchar *buf, *p;
  gint xl, xr, rl, rr, gl, gr, bl, br; /* Scanline data */
  gint xx, yy;
  GdkBitmap *mask;
  GdkGC *gc;
  GdkColor color;
  GdkPoint points[3];
  gdouble r, g, b;
  
  priv = hsv->priv;
  
  /* Compute triangle's vertices */
  
  compute_triangle (hsv, &hx, &hy, &sx, &sy, &vx, &vy);
  
  x1 = hx;
  y1 = hy;
  get_color (priv->h, 1.0, 1.0, &r1, &g1, &b1);
  
  x2 = sx;
  y2 = sy;
  get_color (priv->h, 1.0, 0.0, &r2, &g2, &b2);
  
  x3 = vx;
  y3 = vy;
  get_color (priv->h, 0.0, 1.0, &r3, &g3, &b3);
  
  if (y2 > y3)
    {
      SWAP (x2, x3, t);
      SWAP (y2, y3, t);
      SWAP (r2, r3, t);
      SWAP (g2, g3, t);
      SWAP (b2, b3, t);
    }
  
  if (y1 > y3)
    {
      SWAP (x1, x3, t);
      SWAP (y1, y3, t);
      SWAP (r1, r3, t);
      SWAP (g1, g3, t);
      SWAP (b1, b3, t);
    }
  
  if (y1 > y2)
    {
      SWAP (x1, x2, t);
      SWAP (y1, y2, t);
      SWAP (r1, r2, t);
      SWAP (g1, g2, t);
      SWAP (b1, b2, t);
    }
  
  /* Shade the triangle */
  
  buf = g_new (guchar, width * height * 3);
  
  for (yy = 0; yy < height; yy++)
    {
      p = buf + yy * width * 3;
      
      if (yy + y < y1 || yy + y > y3)
	for (xx = 0; xx < width; xx++)
	  {
	    *p++ = 0;
	    *p++ = 0;
	    *p++ = 0;
	  }
      else {
	if (yy + y < y2)
	  {
	    xl = LERP (x1, x2, y1, y2, yy + y);
	    
	    rl = LERP (r1, r2, y1, y2, yy + y);
	    gl = LERP (g1, g2, y1, y2, yy + y);
	    bl = LERP (b1, b2, y1, y2, yy + y);
	  }
Owen Taylor's avatar
Owen Taylor committed
1170
	else
1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249
	  {
	    xl = LERP (x2, x3, y2, y3, yy + y);
	    
	    rl = LERP (r2, r3, y2, y3, yy + y);
	    gl = LERP (g2, g3, y2, y3, yy + y);
	    bl = LERP (b2, b3, y2, y3, yy + y);
	  }
	
	xr = LERP (x1, x3, y1, y3, yy + y);
	
	rr = LERP (r1, r3, y1, y3, yy + y);
	gr = LERP (g1, g3, y1, y3, yy + y);
	br = LERP (b1, b3, y1, y3, yy + y);
	
	if (xl > xr)
	  {
	    SWAP (xl, xr, t);
	    SWAP (rl, rr, t);
	    SWAP (gl, gr, t);
	    SWAP (bl, br, t);
	  }
	
	for (xx = 0; xx < width; xx++)
	  {
	    if (xx + x < xl || xx + x > xr)
	      {
		*p++ = 0;
		*p++ = 0;
		*p++ = 0;
	      }
	    else
	      {
		*p++ = LERP (rl, rr, xl, xr, xx + x);
		*p++ = LERP (gl, gr, xl, xr, xx + x);
		*p++ = LERP (bl, br, xl, xr, xx + x);
	      }
	  }
      }
    }
  
  /* Create clipping mask */
  
  mask = gdk_pixmap_new (NULL, width, height, 1);
  gc = gdk_gc_new (mask);
  
  color.pixel = 0;
  gdk_gc_set_foreground (gc, &color);
  gdk_draw_rectangle (mask, gc, TRUE,
		      0, 0, width, height);
  
  color.pixel = 1;
  gdk_gc_set_foreground (gc, &color);
  
  points[0].x = x1 - x;
  points[0].y = y1 - y;
  points[1].x = x2 - x;
  points[1].y = y2 - y;
  points[2].x = x3 - x;
  points[2].y = y3 - y;
  gdk_draw_polygon (mask, gc, TRUE, points, 3);
  
  gdk_gc_unref (gc);
  
  gdk_gc_set_clip_mask (priv->gc, mask);
  gdk_gc_set_clip_origin (priv->gc, 0, 0);
  
  /* Draw triangle */
  
  gdk_draw_rgb_image_dithalign (drawable, priv->gc, 0, 0, width, height,
				GDK_RGB_DITHER_MAX,
				buf,
				width * 3,
				x, y);
  
  gdk_gc_set_clip_mask (priv->gc, NULL);
  gdk_bitmap_unref (mask);
  
  g_free (buf);
  
1250 1251 1252 1253 1254 1255
  /* Draw triangle focus outline */

  if (GTK_WIDGET_HAS_FOCUS (hsv) &&
      !priv->focus_on_ring)
    {
      gdk_rgb_gc_set_foreground (priv->gc, 0x000000);
1256
  
1257 1258
      gdk_draw_polygon (drawable, priv->gc, FALSE, points, 3);
    }
1259 1260 1261
  
  /* Draw value marker */
  
1262 1263
  xx = floor (sx + (vx - sx) * priv->v + (hx - vx) * priv->s * priv->v + 0.5) - x;
  yy = floor (sy + (vy - sy) * priv->v + (hy - vy) * priv->s * priv->v + 0.5) - y;
1264 1265 1266 1267 1268 1269 1270 1271 1272 1273
  
  r = priv->h;
  g = priv->s;
  b = priv->v;
  hsv_to_rgb (&r, &g, &b);
  
  if (INTENSITY (r, g, b) > 0.5)
    gdk_rgb_gc_set_foreground (priv->gc, 0x000000);
  else
    gdk_rgb_gc_set_foreground (priv->gc, 0xffffff);
1274 1275 1276

#define OUTER_RADIUS 4
#define INNER_RADIUS 3 
1277 1278
  
  gdk_draw_arc (drawable, priv->gc, FALSE,
1279 1280
		xx - OUTER_RADIUS, yy - OUTER_RADIUS,
		OUTER_RADIUS * 2, OUTER_RADIUS * 2,
1281 1282
		0, 360 * 64);
  gdk_draw_arc (drawable, priv->gc, FALSE,
1283 1284
		xx - INNER_RADIUS, yy - INNER_RADIUS,
		INNER_RADIUS * 2, INNER_RADIUS * 2,
1285
		0, 360 * 64);
Owen Taylor's avatar
Owen Taylor committed
1286 1287 1288 1289
}

/* Paints the contents of the HSV color selector */
static void
1290 1291 1292 1293 1294 1295
paint (GtkHSV      *hsv,
       GdkDrawable *drawable,
       gint         x,
       gint         y,
       gint         width,
       gint         height)
Owen Taylor's avatar
Owen Taylor committed
1296
{
1297 1298
  paint_ring (hsv, drawable, x, y, width, height);
  paint_triangle (hsv, drawable, x, y, width, height);
Owen Taylor's avatar
Owen Taylor committed
1299 1300 1301 1302
}

/* Expose_event handler for the HSV color selector */
static gint
1303 1304
gtk_hsv_expose (GtkWidget      *widget,
		GdkEventExpose *event)
Owen Taylor's avatar
Owen Taylor committed
1305
{
1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350
  GtkHSV *hsv;
  HSVPrivate *priv;
  GdkRectangle rect, dest;
  GdkPixmap *pixmap;
  
  hsv = GTK_HSV (widget);
  priv = hsv->priv;
  
  if (!(GTK_WIDGET_DRAWABLE (widget) && event->window == widget->window))
    return FALSE;
  
  rect.x = widget->allocation.x;
  rect.y = widget->allocation.y;
  rect.width = widget->allocation.width;
  rect.height = widget->allocation.height;
  
  if (!gdk_rectangle_intersect (&event->area, &rect, &dest))
    return FALSE;
  
  pixmap = gdk_pixmap_new (widget->window, dest.width, dest.height,
			   gtk_widget_get_visual (widget)->depth);
  
  rect = dest;
  rect.x = 0;
  rect.y = 0;
  
  gdk_draw_rectangle (pixmap,
		      widget->style->bg_gc[GTK_WIDGET_STATE (widget)],
		      TRUE,
		      0, 0, dest.width, dest.height);
  paint (hsv, pixmap,
	 dest.x - widget->allocation.x, dest.y - widget->allocation.y,
	 dest.width, dest.height);
  
  gdk_draw_pixmap (widget->window,
		   priv->gc,
		   pixmap,
		   0, 0,
		   dest.x,
		   dest.y,
		   event->area.width, event->area.height);
  
  gdk_pixmap_unref (pixmap);
  
  return FALSE;
Owen Taylor's avatar
Owen Taylor committed
1351 1352
}

1353
static gboolean
1354
gtk_hsv_focus (GtkWidget       *widget,
1355 1356 1357 1358 1359
               GtkDirectionType dir)
{
  GtkHSV *hsv;
  HSVPrivate *priv;

1360
  hsv = GTK_HSV (widget);
1361 1362 1363 1364
  priv = hsv->priv;

  if (!GTK_WIDGET_HAS_FOCUS (hsv))
    {
1365 1366 1367 1368 1369
      if (dir == GTK_DIR_TAB_BACKWARD)
        priv->focus_on_ring = FALSE;
      else
        priv->focus_on_ring = TRUE;

1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410
      gtk_widget_grab_focus (GTK_WIDGET (hsv));
      return TRUE;
    }
  
  switch (dir)
    {
    case GTK_DIR_UP:
      if (priv->focus_on_ring)
        return FALSE;
      else
        priv->focus_on_ring = TRUE;
      break;

    case GTK_DIR_DOWN:
      if (priv->focus_on_ring)
        priv->focus_on_ring = FALSE;
      else
        return FALSE;
      break;

    case GTK_DIR_LEFT:
    case GTK_DIR_TAB_BACKWARD:
      if (priv->focus_on_ring)
        return FALSE;
      else
        priv->focus_on_ring = TRUE;
      break;

    case GTK_DIR_RIGHT:
    case GTK_DIR_TAB_FORWARD:
      if (priv->focus_on_ring)
        priv->focus_on_ring = FALSE;
      else
        return FALSE;
      break;
    }

  gtk_widget_queue_draw (GTK_WIDGET (hsv));

  return TRUE;
}
Owen Taylor's avatar
Owen Taylor committed
1411 1412 1413 1414 1415 1416 1417 1418 1419

/**
 * gtk_hsv_new:
 * @void:
 *
 * Creates a new HSV color selector.
 *
 * Return value: A newly-created HSV color selector.
 **/
1420
GtkWidget*
Owen Taylor's avatar
Owen Taylor committed
1421 1422
gtk_hsv_new (void)
{
1423
  return GTK_WIDGET (gtk_type_new (GTK_TYPE_HSV));
Owen Taylor's avatar
Owen Taylor committed
1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436
}

/**
 * gtk_hsv_set_color:
 * @hsv: An HSV color selector.
 * @h: Hue.
 * @s: Saturation.
 * @v: Value.
 *
 * Sets the current color in an HSV color selector.  Color component values must
 * be in the [0.0, 1.0] range.
 **/
void
1437 1438 1439 1440
gtk_hsv_set_color (GtkHSV *hsv,
		   gdouble h,
		   gdouble s,
		   gdouble v)
Owen Taylor's avatar
Owen Taylor committed
1441
{
1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458
  HSVPrivate *priv;
  
  g_return_if_fail (hsv != NULL);
  g_return_if_fail (GTK_IS_HSV (hsv));
  g_return_if_fail (h >= 0.0 && h <= 1.0);
  g_return_if_fail (s >= 0.0 && s <= 1.0);
  g_return_if_fail (v >= 0.0 && v <= 1.0);
  
  priv = hsv->priv;
  
  priv->h = h;
  priv->s = s;
  priv->v = v;
  
  gtk_signal_emit (GTK_OBJECT (hsv), hsv_signals[CHANGED]);
  
  gtk_widget_queue_draw (GTK_WIDGET (hsv));
Owen Taylor's avatar
Owen Taylor committed
1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473
}

/**
 * gtk_hsv_get_color:
 * @hsv: An HSV color selector.
 * @h: Return value for the hue.
 * @s: Return value for the saturation.
 * @v: Return value for the value.
 *
 * Queries the current color in an HSV color selector.  Returned values will be
 * in the [0.0, 1.0] range.
 **/
void
gtk_hsv_get_color (GtkHSV *hsv, double *h, double *s, double *v)
{
1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487
  HSVPrivate *priv;
  
  g_return_if_fail (GTK_IS_HSV (hsv));
  
  priv = hsv->priv;
  
  if (h)
    *h = priv->h;
  
  if (s)
    *s = priv->s;
  
  if (v)
    *v = priv->v;
Owen Taylor's avatar
Owen Taylor committed
1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498
}

/**
 * gtk_hsv_set_metrics:
 * @hsv: An HSV color selector.
 * @size: Diameter for the hue ring.
 * @ring_width: Width of the hue ring.
 *
 * Sets the size and ring width of an HSV color selector.
 **/
void
1499 1500 1501
gtk_hsv_set_metrics (GtkHSV *hsv,
		     gint    size,
		     gint    ring_width)
Owen Taylor's avatar
Owen Taylor committed
1502
{
1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521
  HSVPrivate *priv;
  int same_size;
  
  g_return_if_fail (GTK_IS_HSV (hsv));
  g_return_if_fail (size > 0);
  g_return_if_fail (ring_width > 0);
  g_return_if_fail (2 * ring_width + 1 <= size);
  
  priv = hsv->priv;
  
  same_size = (priv->size == size);
  
  priv->size = size;
  priv->ring_width = ring_width;
  
  if (same_size)
    gtk_widget_queue_draw (GTK_WIDGET (hsv));
  else
    gtk_widget_queue_resize (GTK_WIDGET (hsv));
Owen Taylor's avatar
Owen Taylor committed
1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532
}

/**
 * gtk_hsv_get_metrics:
 * @hsv: An HSV color selector.
 * @size: Return value for the diameter of the hue ring.
 * @ring_width: Return value for the width of the hue ring.
 *
 * Queries the size and ring width of an HSV color selector.
 **/
void
1533 1534 1535
gtk_hsv_get_metrics (GtkHSV *hsv,
		     gint   *size,
		     gint   *ring_width)
Owen Taylor's avatar
Owen Taylor committed
1536
{
1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547
  HSVPrivate *priv;
  
  g_return_if_fail (GTK_IS_HSV (hsv));
  
  priv = hsv->priv;
  
  if (size)
    *size = priv->size;
  
  if (ring_width)
    *ring_width = priv->ring_width;
Owen Taylor's avatar
Owen Taylor committed
1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565
}

/**
 * gtk_hsv_is_adjusting:
 * @hsv:
 *
 * An HSV color selector can be said to be adjusting if multiple rapid changes
 * are being made to its value, for example, when the user is adjusting the
 * value with the mouse.  This function queries whether the HSV color selector
 * is being adjusted or not.
 *
 * Return value: TRUE if clients can ignore changes to the color value, since
 * they may be transitory, or FALSE if they should consider the color value
 * status to be final.
 **/
gboolean
gtk_hsv_is_adjusting (GtkHSV *hsv)
{
1566 1567 1568 1569 1570 1571 1572
  HSVPrivate *priv;
  
  g_return_val_if_fail (GTK_IS_HSV (hsv), FALSE);
  
  priv = hsv->priv;

  return priv->mode != DRAG_NONE;
Owen Taylor's avatar
Owen Taylor committed
1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587
}

/**
 * gtk_hsv_to_rgb:
 * @h: Hue.
 * @s: Saturation.
 * @v: Value.
 * @r: Return value for the red component.
 * @g: Return value for the green component.
 * @b: Return value for the blue component.
 * 
 * Converts a color from HSV space to RGB.  Input values must be in the
 * [0.0, 1.0] range; output values will be in the same range.
 **/
void
1588 1589 1590 1591 1592 1593
gtk_hsv_to_rgb (gdouble  h,
		gdouble  s,
		gdouble  v,
		gdouble *r,
		gdouble *g,
		gdouble *b)
Owen Taylor's avatar
Owen Taylor committed
1594
{
1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608
  g_return_if_fail (h >= 0.0 && h <= 1.0);
  g_return_if_fail (s >= 0.0 && s <= 1.0);
  g_return_if_fail (v >= 0.0 && v <= 1.0);
  
  hsv_to_rgb (&h, &s, &v);
  
  if (r)
    *r = h;
  
  if (g)
    *g = s;
  
  if (b)
    *b = v;
Owen Taylor's avatar
Owen Taylor committed
1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623
}

/**
 * gtk_hsv_to_rgb:
 * @r: Red.
 * @g: Green.
 * @b: Blue.
 * @h: Return value for the hue component.
 * @s: Return value for the saturation component.
 * @v: Return value for the value component.
 * 
 * Converts a color from RGB space to HSV.  Input values must be in the
 * [0.0, 1.0] range; output values will be in the same range.
 **/
void
1624 1625 1626 1627 1628 1629
gtk_rgb_to_hsv (gdouble  r,
		gdouble  g,
		gdouble  b,
		gdouble *h,
		gdouble *s,
		gdouble *v)
Owen Taylor's avatar
Owen Taylor committed
1630
{
1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644
  g_return_if_fail (r >= 0.0 && r <= 1.0);
  g_return_if_fail (g >= 0.0 && g <= 1.0);
  g_return_if_fail (b >= 0.0 && b <= 1.0);
  
  rgb_to_hsv (&r, &g, &b);
  
  if (h)
    *h = r;
  
  if (s)
    *s = g;
  
  if (v)
    *v = b;
Owen Taylor's avatar
Owen Taylor committed
1645
}
1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665

static void
gtk_hsv_move (GtkHSV          *hsv,
              GtkDirectionType dir)
{
  HSVPrivate *priv;
  gdouble hue, sat, val;
  gint hx, hy, sx, sy, vx, vy; /* HSV vertices */
  gint x, y; /* position in triangle */
  
  priv = hsv->priv;

  hue = priv->h;
  sat = priv->s;
  val = priv->v;

  compute_triangle (hsv, &hx, &hy, &sx, &sy, &vx, &vy);

  x = floor (sx + (vx - sx) * priv->v + (hx - vx) * priv->s * priv->v + 0.5);
  y = floor (sy + (vy - sy) * priv->v + (hy - vy) * priv->s * priv->v + 0.5);
1666 1667

#define HUE_DELTA 0.002
1668 1669 1670 1671
  switch (dir)
    {
    case GTK_DIR_UP:
      if (priv->focus_on_ring)
1672
        hue += HUE_DELTA;
1673 1674 1675 1676 1677 1678 1679 1680 1681
      else
        {
          y -= 1;
          compute_sv (hsv, x, y, &sat, &val);
        }
      break;

    case GTK_DIR_DOWN:
      if (priv->focus_on_ring)
1682
        hue -= HUE_DELTA;
1683 1684 1685 1686 1687 1688 1689 1690 1691
      else
        {
          y += 1;
          compute_sv (hsv, x, y, &sat, &val);
        }
      break;

    case GTK_DIR_LEFT:
      if (priv->focus_on_ring)