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ardour/gtk2_ardour/canvas-simplerect.c

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#include <stdio.h>
#include <math.h>
#include <cairo.h>
#include <libgnomecanvas/libgnomecanvas.h>
#include "canvas-simplerect.h"
#include "rgb_macros.h"
#include "gettext.h"
#define _(Text) dgettext (PACKAGE,Text)
enum {
PROP_0,
PROP_X1,
PROP_Y1,
PROP_X2,
PROP_Y2,
PROP_OUTLINE_PIXELS,
PROP_OUTLINE_WHAT,
PROP_FILL,
PROP_FILL_COLOR_RGBA,
PROP_OUTLINE_COLOR_RGBA,
PROP_DRAW
};
static void gnome_canvas_simplerect_class_init (GnomeCanvasSimpleRectClass *class);
static void gnome_canvas_simplerect_init (GnomeCanvasSimpleRect *simplerect);
static void gnome_canvas_simplerect_destroy (GtkObject *object);
static void gnome_canvas_simplerect_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gnome_canvas_simplerect_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void gnome_canvas_simplerect_update (GnomeCanvasItem *item,
double *affine,
ArtSVP *clip_path,
int flags);
static void gnome_canvas_simplerect_bounds (GnomeCanvasItem *item,
double *x1,
double *y1,
double *x2,
double *y2);
static double gnome_canvas_simplerect_point (GnomeCanvasItem *item, double x, double y, int cx, int cy, GnomeCanvasItem **actual_item);
static void gnome_canvas_simplerect_render (GnomeCanvasItem *item, GnomeCanvasBuf *buf);
static void gnome_canvas_simplerect_draw (GnomeCanvasItem *item, GdkDrawable *drawable, int x, int y, int w, int h);
static GnomeCanvasItemClass *parent_class;
GType
gnome_canvas_simplerect_get_type (void)
{
static GType simplerect_type;
if (!simplerect_type) {
static const GTypeInfo object_info = {
sizeof (GnomeCanvasSimpleRectClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gnome_canvas_simplerect_class_init,
(GClassFinalizeFunc) NULL,
NULL, /* class_data */
sizeof (GnomeCanvasSimpleRect),
0, /* n_preallocs */
(GInstanceInitFunc) gnome_canvas_simplerect_init,
NULL /* value_table */
};
simplerect_type = g_type_register_static (GNOME_TYPE_CANVAS_ITEM, "GnomeCanvasSimpleRect",
&object_info, 0);
}
return simplerect_type;
}
static void
gnome_canvas_simplerect_class_init (GnomeCanvasSimpleRectClass *class)
{
GObjectClass *gobject_class;
GtkObjectClass *object_class;
GnomeCanvasItemClass *item_class;
gobject_class = (GObjectClass *) class;
object_class = (GtkObjectClass *) class;
item_class = (GnomeCanvasItemClass *) class;
parent_class = g_type_class_peek_parent (class);
gobject_class->set_property = gnome_canvas_simplerect_set_property;
gobject_class->get_property = gnome_canvas_simplerect_get_property;
g_object_class_install_property (gobject_class,
PROP_X1,
g_param_spec_double ("x1",
_("x1"),
_("x coordinate of upper left corner of rect"),
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_Y1,
g_param_spec_double ("y1",
_("y1"),
_("y coordinate of upper left corner of rect "),
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_X2,
g_param_spec_double ("x2",
_("x2"),
_("x coordinate of lower right corner of rect"),
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_Y2,
g_param_spec_double ("y2",
_("y2"),
_("y coordinate of lower right corner of rect "),
-G_MAXDOUBLE,
G_MAXDOUBLE,
0.0,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_OUTLINE_PIXELS,
g_param_spec_uint ("outline_pixels",
_("outline pixels"),
_("width in pixels of outline"),
0,
G_MAXUINT,
0,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_OUTLINE_WHAT,
g_param_spec_uint ("outline_what",
_("outline what"),
_("which boundaries to outline (mask)"),
0,
G_MAXUINT,
0,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_FILL,
g_param_spec_boolean ("fill",
_("fill"),
_("fill rectangle"),
TRUE,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_DRAW,
g_param_spec_boolean ("draw",
_("draw"),
_("draw rectangle"),
TRUE,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_OUTLINE_COLOR_RGBA,
g_param_spec_uint ("outline_color_rgba",
_("outline color rgba"),
_("color of outline"),
0,
G_MAXUINT,
0,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_FILL_COLOR_RGBA,
g_param_spec_uint ("fill_color_rgba",
_("fill color rgba"),
_("color of fill"),
0,
G_MAXUINT,
0,
G_PARAM_READWRITE));
object_class->destroy = gnome_canvas_simplerect_destroy;
item_class->update = gnome_canvas_simplerect_update;
item_class->draw = gnome_canvas_simplerect_draw;
item_class->bounds = gnome_canvas_simplerect_bounds;
item_class->point = gnome_canvas_simplerect_point;
item_class->render = gnome_canvas_simplerect_render;
}
static void
gnome_canvas_simplerect_init (GnomeCanvasSimpleRect *simplerect)
{
simplerect->x1 = 0.0;
simplerect->y1 = 0.0;
simplerect->x2 = 0.0;
simplerect->y2 = 0.0;
simplerect->fill = TRUE;
simplerect->draw = TRUE;
simplerect->full_draw_on_update = TRUE;
simplerect->fill_color = 0;
simplerect->outline_color = 0;
simplerect->outline_pixels = 1;
simplerect->outline_what = 0xf;
}
static void
gnome_canvas_simplerect_destroy (GtkObject *object)
{
GnomeCanvasSimpleRect *rect;
g_return_if_fail (object != NULL);
g_return_if_fail (GNOME_IS_CANVAS_SIMPLERECT (object));
rect = GNOME_CANVAS_SIMPLERECT (object);
/* remember, destroy can be run multiple times! */
if (GTK_OBJECT_CLASS (parent_class)->destroy)
(* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}
static void
gnome_canvas_simplerect_bounds (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2)
{
GnomeCanvasSimpleRect *simplerect = GNOME_CANVAS_SIMPLERECT (item);
*x1 = simplerect->x1;
*y1 = simplerect->y1;
*x2 = simplerect->x2 + 1;
*y2 = simplerect->y2 + 1;
}
static void
gnome_canvas_simplerect_reset_bounds (GnomeCanvasItem *item)
{
GnomeCanvasSimpleRect* simplerect;
double x1, x2, y1, y2;
double old_x1, old_x2, old_y1, old_y2;
ArtDRect unionrect, old, new;
old_x1 = item->x1;
old_y1 = item->y1;
old_x2 = item->x2;
old_y2 = item->y2;
gnome_canvas_simplerect_bounds (item, &x1, &y1, &x2, &y2);
gnome_canvas_item_i2w (item, &x1, &y1);
gnome_canvas_item_i2w (item, &x2, &y2);
item->x1 = x1;
item->y1 = y1;
item->x2 = x2;
item->y2 = y2;
/* now compute bounding box in canvas units */
simplerect = GNOME_CANVAS_SIMPLERECT (item);
gnome_canvas_w2c (GNOME_CANVAS(item->canvas), x1, y1, &simplerect->bbox_ulx, &simplerect->bbox_uly);
gnome_canvas_w2c (GNOME_CANVAS(item->canvas), x2, y2, &simplerect->bbox_lrx, &simplerect->bbox_lry);
/* now queue redraws for changed areas */
if (item->x1 == old_x1 && item->x2 == old_x2) {
/* no change in x-axis position */
if (item->y1 == old_y1) {
/* top didn't change, so just draw bottom */
double start_y = MIN (item->y2, old_y2);
double end_y = MAX (item->y2, old_y2);
gnome_canvas_request_redraw (item->canvas, item->x1, start_y - 0.5, item->x2, end_y + 1.5);
return;
} else if (item->y2 == old_y2) {
/* bottom didn't change, just draw top */
double start_y = MIN (item->y1, old_y1);
double end_y = MAX (item->y1, old_y1);
gnome_canvas_request_redraw (item->canvas, item->x1, start_y - 0.5, item->x2, end_y + 1.5);
return;
}
} else if (item->y1 == old_y1 && item->y2 == old_y2) {
/* no change in y-axis position */
if (item->x1 == old_x1) {
/* start didn't change, so just draw at the end */
double start_x = MIN (item->x2, old_x2);
double end_x = MAX (item->x2, old_x2);
gnome_canvas_request_redraw (item->canvas, start_x - 0.5, item->y1, end_x + 1.5, item->y2);
return;
} else if (item->x2 == old_x2) {
/* end didn't change, so just draw at the start */
double start_x = MIN (item->x1, old_x1);
double end_x = MAX (item->x1, old_x1);
gnome_canvas_request_redraw (item->canvas, start_x - 0.5, item->y1, end_x + 1.5, item->y2 + 0.5);
return;
}
}
new.x0 = x1;
new.y0 = y1;
new.x1 = x2;
new.y1 = y2;
old.x0 = old_x1;
old.y0 = old_y1;
old.x1 = old_x2;
old.y1 = old_y2;
art_drect_union (&unionrect, &old, &new);
gnome_canvas_request_redraw (item->canvas,
unionrect.x0 - 0.5,
unionrect.y0 - 0.5,
unionrect.x1 + 1.5,
unionrect.y1 + 1.5);
}
/*
* CANVAS CALLBACKS
*/
static void
gnome_canvas_simplerect_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GnomeCanvasSimpleRect *simplerect;
int update = FALSE;
int bounds_changed = FALSE;
g_return_if_fail (object != NULL);
g_return_if_fail (GNOME_IS_CANVAS_SIMPLERECT (object));
simplerect = GNOME_CANVAS_SIMPLERECT (object);
switch (prop_id) {
case PROP_X1:
if (simplerect->x1 != g_value_get_double (value)) {
simplerect->x1 = g_value_get_double (value);
bounds_changed = TRUE;
}
break;
case PROP_Y1:
if (simplerect->y1 != g_value_get_double (value)) {
simplerect->y1 = g_value_get_double (value);
bounds_changed = TRUE;
}
break;
case PROP_X2:
if (simplerect->x2 != g_value_get_double (value)) {
simplerect->x2 = g_value_get_double (value);
bounds_changed = TRUE;
}
break;
case PROP_Y2:
if (simplerect->y2 != g_value_get_double (value)) {
simplerect->y2 = g_value_get_double (value);
bounds_changed = TRUE;
}
break;
case PROP_DRAW:
if (simplerect->draw != g_value_get_boolean (value)) {
simplerect->draw = g_value_get_boolean (value);
update = TRUE;
}
break;
case PROP_FILL:
if (simplerect->fill != g_value_get_boolean (value)) {
simplerect->fill = g_value_get_boolean (value);
update = TRUE;
}
break;
case PROP_FILL_COLOR_RGBA:
if (simplerect->fill_color != g_value_get_uint(value)) {
simplerect->fill_color = g_value_get_uint(value);
update = TRUE;
}
break;
case PROP_OUTLINE_COLOR_RGBA:
if (simplerect->outline_color != g_value_get_uint(value)) {
simplerect->outline_color = g_value_get_uint(value);
update = TRUE;
}
break;
case PROP_OUTLINE_PIXELS:
if (simplerect->outline_pixels != g_value_get_uint(value)) {
simplerect->outline_pixels = g_value_get_uint(value);
update = TRUE;
}
break;
case PROP_OUTLINE_WHAT:
if (simplerect->outline_what != g_value_get_uint(value)) {
simplerect->outline_what = g_value_get_uint(value);
update = TRUE;
}
break;
default:
break;
}
simplerect->full_draw_on_update = update;
if (update || bounds_changed) {
gnome_canvas_item_request_update (GNOME_CANVAS_ITEM(object));
}
}
static void
gnome_canvas_simplerect_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GnomeCanvasSimpleRect *rect = GNOME_CANVAS_SIMPLERECT (object);
g_return_if_fail (object != NULL);
g_return_if_fail (GNOME_IS_CANVAS_SIMPLERECT (object));
switch (prop_id) {
case PROP_X1:
g_value_set_double (value, rect->x1);
break;
case PROP_X2:
g_value_set_double (value, rect->x2);
break;
case PROP_Y1:
g_value_set_double (value, rect->y1);
break;
case PROP_Y2:
g_value_set_double (value, rect->y2);
break;
case PROP_OUTLINE_WHAT:
g_value_set_uint (value, rect->outline_what);
break;
case PROP_FILL:
g_value_set_boolean (value, rect->fill);
break;
case PROP_OUTLINE_PIXELS:
g_value_set_uint (value, rect->outline_pixels);
break;
case PROP_FILL_COLOR_RGBA:
g_value_set_uint (value, rect->fill_color);
break;
case PROP_OUTLINE_COLOR_RGBA:
g_value_set_uint (value, rect->outline_color);
break;
case PROP_DRAW:
g_value_set_boolean (value, rect->draw);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gnome_canvas_simplerect_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
{
GnomeCanvasSimpleRect *simplerect;
unsigned char foo;
simplerect = GNOME_CANVAS_SIMPLERECT (item);
if (parent_class->update)
(* parent_class->update) (item, affine, clip_path, flags);
gnome_canvas_simplerect_reset_bounds (item);
if (simplerect->full_draw_on_update) {
gnome_canvas_request_redraw (item->canvas,
simplerect->bbox_ulx,
simplerect->bbox_uly,
simplerect->bbox_lrx+0.5,
simplerect->bbox_lry+0.5);
simplerect->full_draw_on_update = FALSE;
}
UINT_TO_RGBA (simplerect->fill_color, &simplerect->fill_r, &simplerect->fill_g, &simplerect->fill_b, &simplerect->fill_a);
UINT_TO_RGBA (simplerect->outline_color, &simplerect->outline_r, &simplerect->outline_g, &simplerect->outline_b, &foo);
}
// this can be useful for debugging/understanding how the canvas redraws
// stuff.
#undef HARLEQUIN_DEBUGGING
#undef SIMPLERECT_FAST_RENDERER
#ifdef SIMPLERECT_FAST_RENDERER
static void
gnome_canvas_simplerect_render (GnomeCanvasItem *item,
GnomeCanvasBuf *buf)
{
GnomeCanvasSimpleRect *simplerect;
int end, begin;
int ey, sy;
unsigned int i;
ArtIRect intersection;
ArtIRect self;
simplerect = GNOME_CANVAS_SIMPLERECT (item);
if (parent_class->render) {
(*parent_class->render) (item, buf);
}
if (buf->is_bg) {
#ifdef HARLEQUIN_DEBUGGING
gint randr, randg, randb;
randr = random() % 255;
randg = random() % 255;
randb = random() % 255;
PAINT_BOX(buf, randr, randg, randb, 255, buf->rect.x0, buf->rect.y0, buf->rect.x1, buf->rect.y1);
#endif
gnome_canvas_buf_ensure_buf (buf);
buf->is_bg = FALSE;
}
if (!simplerect->draw) {
return;
}
self.x0 = simplerect->bbox_ulx;
self.y0 = simplerect->bbox_uly;
self.x1 = simplerect->bbox_lrx;
self.y1 = simplerect->bbox_lry;
art_irect_intersect (&intersection, &self, &buf->rect);
begin = MAX(simplerect->bbox_ulx, buf->rect.x0);
end = MIN((simplerect->bbox_lrx-1), buf->rect.x1);
sy = simplerect->bbox_uly;
ey = simplerect->bbox_lry-1;
if (simplerect->fill) {
// this can be useful for debugging/understanding how the canvas redraws
// stuff.
#ifdef HARLEQUIN_DEBUGGING
gint randr, randg, randb;
randr = random() % 255;
randg = random() % 255;
randb = random() % 255;
PAINT_BOX(buf, randr, randg, randb, simplerect->fill_a, begin, sy, end, ey);
#else
PAINT_BOX (buf, simplerect->fill_r, simplerect->fill_g, simplerect->fill_b, simplerect->fill_a,
intersection.x0, intersection.y0,
intersection.x1, intersection.y1);
#endif
}
for (i = 0; i < simplerect->outline_pixels; ++i) {
if (simplerect->outline_what & 0x1) {
if (begin == simplerect->bbox_ulx) {
PAINT_VERT(buf, simplerect->outline_r, simplerect->outline_g, simplerect->outline_b, begin + i, sy, ey);
}
}
if (simplerect->outline_what & 0x2) {
if (end == (simplerect->bbox_lrx - 1)) {
PAINT_VERT(buf, simplerect->outline_r, simplerect->outline_g, simplerect->outline_b, end - i, sy, ey + 1);
}
}
if (simplerect->outline_what & 0x4) {
PAINT_HORIZ(buf, simplerect->outline_r, simplerect->outline_g, simplerect->outline_b, begin, end, sy+i);
}
if (simplerect->outline_what & 0x8) {
PAINT_HORIZ(buf, simplerect->outline_r, simplerect->outline_g, simplerect->outline_b, begin, end + 1, ey-i);
}
}
}
#else /* SIMPLERECT_FAST_RENDERER */
static void
gnome_canvas_simplerect_render (GnomeCanvasItem *item,
GnomeCanvasBuf *buf)
{
GnomeCanvasSimpleRect *simplerect;
int end, begin;
int ey, sy;
unsigned int i;
simplerect = GNOME_CANVAS_SIMPLERECT (item);
if (parent_class->render) {
(*parent_class->render) (item, buf);
}
if (buf->is_bg) {
#ifdef HARLEQUIN_DEBUGGING
gint randr, randg, randb;
randr = random() % 255;
randg = random() % 255;
randb = random() % 255;
PAINT_BOX(buf, randr, randg, randb, 255, buf->rect.x0, buf->rect.y0, buf->rect.x1, buf->rect.y1);
#endif
gnome_canvas_buf_ensure_buf (buf);
buf->is_bg = FALSE;
}
if (!simplerect->draw) {
return;
}
begin = MAX(simplerect->bbox_ulx,buf->rect.x0);
end = MIN((simplerect->bbox_lrx-1),buf->rect.x1);
sy = simplerect->bbox_uly;
ey = simplerect->bbox_lry-1;
if (simplerect->fill) {
#ifdef HARLEQUIN_DEBUGGING
gint randr, randg, randb;
randr = random() % 255;
randg = random() % 255;
randb = random() % 255;
PAINT_BOX(buf, randr, randg, randb, simplerect->fill_a, begin, sy, end, ey);
#else
PAINT_BOX(buf, simplerect->fill_r, simplerect->fill_g, simplerect->fill_b, simplerect->fill_a, begin, sy, end, ey);
#endif
}
for (i = 0; i < simplerect->outline_pixels; ++i) {
if (simplerect->outline_what & 0x1) {
if (begin == simplerect->bbox_ulx) {
PAINT_VERT(buf, simplerect->outline_r, simplerect->outline_g, simplerect->outline_b, begin + i, sy, ey);
}
}
if (simplerect->outline_what & 0x2) {
if (end == (simplerect->bbox_lrx - 1)) {
PAINT_VERT(buf, simplerect->outline_r, simplerect->outline_g, simplerect->outline_b, end - i, sy, ey + 1);
}
}
if (simplerect->outline_what & 0x4) {
PAINT_HORIZ(buf, simplerect->outline_r, simplerect->outline_g, simplerect->outline_b, begin, end, sy+i);
}
if (simplerect->outline_what & 0x8) {
PAINT_HORIZ(buf, simplerect->outline_r, simplerect->outline_g, simplerect->outline_b, begin, end + 1, ey-i);
}
}
}
#endif /* SIMPLERECT_FAST_RENDERER */
static void
gnome_canvas_simplerect_draw (GnomeCanvasItem *item,
GdkDrawable *drawable,
int x, int y,
int width, int height)
{
GnomeCanvasSimpleRect *simplerect;
cairo_t* cr;
double ulx;
double uly;
double lrx;
double lry;
simplerect = GNOME_CANVAS_SIMPLERECT (item);
cr = gdk_cairo_create (drawable);
if (x > simplerect->bbox_ulx) {
ulx = x;
} else {
ulx = simplerect->bbox_ulx;
}
if (y > simplerect->bbox_uly) {
uly = y;
} else {
uly = simplerect->bbox_uly;
}
if (x + width > simplerect->bbox_lrx) {
lrx = simplerect->bbox_lrx;
} else {
lrx = x + width;
}
if (y + height > simplerect->bbox_lry) {
lry = simplerect->bbox_lry;
} else {
lry = y + height;
}
ulx -= x;
uly -= y;
lrx -= x;
lry -= y;
cairo_rectangle (cr, ulx, uly, lrx - ulx, lry - uly);
if (simplerect->fill) {
cairo_set_source_rgba (cr,
simplerect->fill_r/255.0,
simplerect->fill_g/255.0,
simplerect->fill_b/255.0,
simplerect->fill_a/255.0);
cairo_fill (cr);
}
if (simplerect->outline_what && simplerect->outline_pixels) {
#define x_in_range(a) (x <= (a) && (a) < x + width)
#define y_in_range(a) (y <= (a) && (a) < y + height)
cairo_set_line_width (cr, simplerect->outline_pixels);
cairo_set_source_rgb (cr,
simplerect->outline_r/255.0,
simplerect->outline_g/255.0,
simplerect->outline_b/255.0);
if (simplerect->outline_what & 0x1) {
/* left edge, if visible */
if (x_in_range (simplerect->bbox_ulx)) {
cairo_move_to (cr, ulx+0.5, uly+0.5);
cairo_line_to (cr, ulx+0.5, lry+0.5);
cairo_stroke (cr);
}
}
if (simplerect->outline_what & 0x2) {
/* right edge, if visible */
if (x_in_range (simplerect->bbox_lrx)) {
cairo_move_to (cr, lrx+0.5, uly+0.5);
cairo_line_to (cr, lrx+0.5, lry+0.5);
cairo_stroke (cr);
}
}
if (simplerect->outline_what & 0x4) {
/* top edge */
if (y_in_range (simplerect->bbox_uly)) {
cairo_move_to (cr, ulx+0.5, uly+0.5);
cairo_line_to (cr, lrx+0.5, uly+0.5);
cairo_stroke (cr);
}
}
if (simplerect->outline_what & 0x8) {
/* bottom edge */
if (y_in_range (simplerect->bbox_lry)) {
cairo_move_to (cr, ulx+0.5, lry+0.5);
cairo_line_to (cr, lrx+0.5, lry+0.5);
cairo_stroke (cr);
}
}
}
cairo_destroy (cr);
}
static double
gnome_canvas_simplerect_point (GnomeCanvasItem *item, double x, double y, int cx, int cy, GnomeCanvasItem **actual_item)
{
GnomeCanvasSimpleRect *simplerect;
double x1, y1, x2, y2;
double dx, dy;
simplerect = GNOME_CANVAS_SIMPLERECT (item);
*actual_item = item;
/* Find the bounds for the rectangle plus its outline width */
gnome_canvas_simplerect_bounds (item, &x1, &y1, &x2, &y2);
/* Is point inside rectangle */
if ((x >= x1) && (y >= y1) && (x <= x2) && (y <= y2)) {
return 0.0;
}
/* Point is outside rectangle */
if (x < x1)
dx = x1 - x;
else if (x > x2)
dx = x - x2;
else
dx = 0.0;
if (y < y1)
dy = y1 - y;
else if (y > y2)
dy = y - y2;
else
dy = 0.0;
return sqrt (dx * dx + dy * dy);
}
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