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gtk2/gtk/gtkcurve.c
Matthias Clasen 07e7719441 Apply a cleanup patch by Kjartan Maraas (#341812) 
2006-10-08  Matthias Clasen  <mclasen@redhat.com>

	* Apply a cleanup patch by Kjartan Maraas  (#341812)
2006-10-08 05:07:55 +00:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 1997 David Mosberger
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* 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/.
*/
#include <config.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "gtkcurve.h"
#include "gtkdrawingarea.h"
#include "gtkmain.h"
#include "gtkmarshalers.h"
#include "gtkradiobutton.h"
#include "gtktable.h"
#include "gtkprivate.h"
#include "gtkintl.h"
#include "gtkalias.h"
#define RADIUS 3 /* radius of the control points */
#define MIN_DISTANCE 8 /* min distance between control points */
#define GRAPH_MASK (GDK_EXPOSURE_MASK | \
GDK_POINTER_MOTION_MASK | \
GDK_POINTER_MOTION_HINT_MASK | \
GDK_ENTER_NOTIFY_MASK | \
GDK_BUTTON_PRESS_MASK | \
GDK_BUTTON_RELEASE_MASK | \
GDK_BUTTON1_MOTION_MASK)
enum {
PROP_0,
PROP_CURVE_TYPE,
PROP_MIN_X,
PROP_MAX_X,
PROP_MIN_Y,
PROP_MAX_Y
};
static GtkDrawingAreaClass *parent_class = NULL;
static guint curve_type_changed_signal = 0;
/* forward declarations: */
static void gtk_curve_class_init (GtkCurveClass *class);
static void gtk_curve_init (GtkCurve *curve);
static void gtk_curve_get_property (GObject *object,
guint param_id,
GValue *value,
GParamSpec *pspec);
static void gtk_curve_set_property (GObject *object,
guint param_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_curve_finalize (GObject *object);
static gint gtk_curve_graph_events (GtkWidget *widget,
GdkEvent *event,
GtkCurve *c);
static void gtk_curve_size_graph (GtkCurve *curve);
GType
gtk_curve_get_type (void)
{
static GType curve_type = 0;
if (!curve_type)
{
const GTypeInfo curve_info =
{
sizeof (GtkCurveClass),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc) gtk_curve_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GtkCurve),
0, /* n_preallocs */
(GInstanceInitFunc) gtk_curve_init,
};
curve_type = g_type_register_static (GTK_TYPE_DRAWING_AREA, I_("GtkCurve"),
&curve_info, 0);
}
return curve_type;
}
static void
gtk_curve_class_init (GtkCurveClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
parent_class = g_type_class_peek_parent (class);
gobject_class->finalize = gtk_curve_finalize;
gobject_class->set_property = gtk_curve_set_property;
gobject_class->get_property = gtk_curve_get_property;
g_object_class_install_property (gobject_class,
PROP_CURVE_TYPE,
g_param_spec_enum ("curve-type",
P_("Curve type"),
P_("Is this curve linear, spline interpolated, or free-form"),
GTK_TYPE_CURVE_TYPE,
GTK_CURVE_TYPE_LINEAR,
GTK_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_MIN_X,
g_param_spec_float ("min-x",
P_("Minimum X"),
P_("Minimum possible value for X"),
-G_MAXFLOAT,
G_MAXFLOAT,
0.0,
GTK_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_MAX_X,
g_param_spec_float ("max-x",
P_("Maximum X"),
P_("Maximum possible X value"),
-G_MAXFLOAT,
G_MAXFLOAT,
1.0,
GTK_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_MIN_Y,
g_param_spec_float ("min-y",
P_("Minimum Y"),
P_("Minimum possible value for Y"),
-G_MAXFLOAT,
G_MAXFLOAT,
0.0,
GTK_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_MAX_Y,
g_param_spec_float ("max-y",
P_("Maximum Y"),
P_("Maximum possible value for Y"),
-G_MAXFLOAT,
G_MAXFLOAT,
1.0,
GTK_PARAM_READWRITE));
curve_type_changed_signal =
g_signal_new (I_("curve_type_changed"),
G_OBJECT_CLASS_TYPE (gobject_class),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GtkCurveClass, curve_type_changed),
NULL, NULL,
_gtk_marshal_VOID__VOID,
G_TYPE_NONE, 0);
}
static void
gtk_curve_init (GtkCurve *curve)
{
gint old_mask;
curve->cursor_type = GDK_TOP_LEFT_ARROW;
curve->pixmap = NULL;
curve->curve_type = GTK_CURVE_TYPE_SPLINE;
curve->height = 0;
curve->grab_point = -1;
curve->num_points = 0;
curve->point = NULL;
curve->num_ctlpoints = 0;
curve->ctlpoint = NULL;
curve->min_x = 0.0;
curve->max_x = 1.0;
curve->min_y = 0.0;
curve->max_y = 1.0;
old_mask = gtk_widget_get_events (GTK_WIDGET (curve));
gtk_widget_set_events (GTK_WIDGET (curve), old_mask | GRAPH_MASK);
g_signal_connect (curve, "event",
G_CALLBACK (gtk_curve_graph_events), curve);
gtk_curve_size_graph (curve);
}
static void
gtk_curve_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkCurve *curve = GTK_CURVE (object);
switch (prop_id)
{
case PROP_CURVE_TYPE:
gtk_curve_set_curve_type (curve, g_value_get_enum (value));
break;
case PROP_MIN_X:
gtk_curve_set_range (curve, g_value_get_float (value), curve->max_x,
curve->min_y, curve->max_y);
break;
case PROP_MAX_X:
gtk_curve_set_range (curve, curve->min_x, g_value_get_float (value),
curve->min_y, curve->max_y);
break;
case PROP_MIN_Y:
gtk_curve_set_range (curve, curve->min_x, curve->max_x,
g_value_get_float (value), curve->max_y);
break;
case PROP_MAX_Y:
gtk_curve_set_range (curve, curve->min_x, curve->max_x,
curve->min_y, g_value_get_float (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_curve_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkCurve *curve = GTK_CURVE (object);
switch (prop_id)
{
case PROP_CURVE_TYPE:
g_value_set_enum (value, curve->curve_type);
break;
case PROP_MIN_X:
g_value_set_float (value, curve->min_x);
break;
case PROP_MAX_X:
g_value_set_float (value, curve->max_x);
break;
case PROP_MIN_Y:
g_value_set_float (value, curve->min_y);
break;
case PROP_MAX_Y:
g_value_set_float (value, curve->max_y);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static int
project (gfloat value, gfloat min, gfloat max, int norm)
{
return (norm - 1) * ((value - min) / (max - min)) + 0.5;
}
static gfloat
unproject (gint value, gfloat min, gfloat max, int norm)
{
return value / (gfloat) (norm - 1) * (max - min) + min;
}
/* Solve the tridiagonal equation system that determines the second
derivatives for the interpolation points. (Based on Numerical
Recipies 2nd Edition.) */
static void
spline_solve (int n, gfloat x[], gfloat y[], gfloat y2[])
{
gfloat p, sig, *u;
gint i, k;
u = g_malloc ((n - 1) * sizeof (u[0]));
y2[0] = u[0] = 0.0; /* set lower boundary condition to "natural" */
for (i = 1; i < n - 1; ++i)
{
sig = (x[i] - x[i - 1]) / (x[i + 1] - x[i - 1]);
p = sig * y2[i - 1] + 2.0;
y2[i] = (sig - 1.0) / p;
u[i] = ((y[i + 1] - y[i])
/ (x[i + 1] - x[i]) - (y[i] - y[i - 1]) / (x[i] - x[i - 1]));
u[i] = (6.0 * u[i] / (x[i + 1] - x[i - 1]) - sig * u[i - 1]) / p;
}
y2[n - 1] = 0.0;
for (k = n - 2; k >= 0; --k)
y2[k] = y2[k] * y2[k + 1] + u[k];
g_free (u);
}
static gfloat
spline_eval (int n, gfloat x[], gfloat y[], gfloat y2[], gfloat val)
{
gint k_lo, k_hi, k;
gfloat h, b, a;
/* do a binary search for the right interval: */
k_lo = 0; k_hi = n - 1;
while (k_hi - k_lo > 1)
{
k = (k_hi + k_lo) / 2;
if (x[k] > val)
k_hi = k;
else
k_lo = k;
}
h = x[k_hi] - x[k_lo];
g_assert (h > 0.0);
a = (x[k_hi] - val) / h;
b = (val - x[k_lo]) / h;
return a*y[k_lo] + b*y[k_hi] +
((a*a*a - a)*y2[k_lo] + (b*b*b - b)*y2[k_hi]) * (h*h)/6.0;
}
static void
gtk_curve_interpolate (GtkCurve *c, gint width, gint height)
{
gfloat *vector;
int i;
vector = g_malloc (width * sizeof (vector[0]));
gtk_curve_get_vector (c, width, vector);
c->height = height;
if (c->num_points != width)
{
c->num_points = width;
if (c->point)
g_free (c->point);
c->point = g_malloc (c->num_points * sizeof (c->point[0]));
}
for (i = 0; i < width; ++i)
{
c->point[i].x = RADIUS + i;
c->point[i].y = RADIUS + height
- project (vector[i], c->min_y, c->max_y, height);
}
g_free (vector);
}
static void
gtk_curve_draw (GtkCurve *c, gint width, gint height)
{
GtkStateType state;
GtkStyle *style;
gint i;
if (!c->pixmap)
return;
if (c->height != height || c->num_points != width)
gtk_curve_interpolate (c, width, height);
state = GTK_STATE_NORMAL;
if (!GTK_WIDGET_IS_SENSITIVE (GTK_WIDGET (c)))
state = GTK_STATE_INSENSITIVE;
style = GTK_WIDGET (c)->style;
/* clear the pixmap: */
gtk_paint_flat_box (style, c->pixmap, GTK_STATE_NORMAL, GTK_SHADOW_NONE,
NULL, GTK_WIDGET (c), "curve_bg",
0, 0, width + RADIUS * 2, height + RADIUS * 2);
/* draw the grid lines: (XXX make more meaningful) */
for (i = 0; i < 5; i++)
{
gdk_draw_line (c->pixmap, style->dark_gc[state],
RADIUS, i * (height / 4.0) + RADIUS,
width + RADIUS, i * (height / 4.0) + RADIUS);
gdk_draw_line (c->pixmap, style->dark_gc[state],
i * (width / 4.0) + RADIUS, RADIUS,
i * (width / 4.0) + RADIUS, height + RADIUS);
}
gdk_draw_points (c->pixmap, style->fg_gc[state], c->point, c->num_points);
if (c->curve_type != GTK_CURVE_TYPE_FREE)
for (i = 0; i < c->num_ctlpoints; ++i)
{
gint x, y;
if (c->ctlpoint[i][0] < c->min_x)
continue;
x = project (c->ctlpoint[i][0], c->min_x, c->max_x,
width);
y = height -
project (c->ctlpoint[i][1], c->min_y, c->max_y,
height);
/* draw a bullet: */
gdk_draw_arc (c->pixmap, style->fg_gc[state], TRUE, x, y,
RADIUS * 2, RADIUS*2, 0, 360*64);
}
gdk_draw_drawable (GTK_WIDGET (c)->window, style->fg_gc[state], c->pixmap,
0, 0, 0, 0, width + RADIUS * 2, height + RADIUS * 2);
}
static gint
gtk_curve_graph_events (GtkWidget *widget, GdkEvent *event, GtkCurve *c)
{
GdkCursorType new_type = c->cursor_type;
gint i, src, dst, leftbound, rightbound;
GdkEventMotion *mevent;
GtkWidget *w;
gint tx, ty;
gint cx, x, y, width, height;
gint closest_point = 0;
gfloat rx, ry, min_x;
guint distance;
gint x1, x2, y1, y2;
gint retval = FALSE;
w = GTK_WIDGET (c);
width = w->allocation.width - RADIUS * 2;
height = w->allocation.height - RADIUS * 2;
if ((width < 0) || (height < 0))
return FALSE;
/* get the pointer position */
gdk_window_get_pointer (w->window, &tx, &ty, NULL);
x = CLAMP ((tx - RADIUS), 0, width-1);
y = CLAMP ((ty - RADIUS), 0, height-1);
min_x = c->min_x;
distance = ~0U;
for (i = 0; i < c->num_ctlpoints; ++i)
{
cx = project (c->ctlpoint[i][0], min_x, c->max_x, width);
if ((guint) abs (x - cx) < distance)
{
distance = abs (x - cx);
closest_point = i;
}
}
switch (event->type)
{
case GDK_CONFIGURE:
if (c->pixmap)
g_object_unref (c->pixmap);
c->pixmap = NULL;
/* fall through */
case GDK_EXPOSE:
if (!c->pixmap)
c->pixmap = gdk_pixmap_new (w->window,
w->allocation.width,
w->allocation.height, -1);
gtk_curve_draw (c, width, height);
break;
case GDK_BUTTON_PRESS:
gtk_grab_add (widget);
new_type = GDK_TCROSS;
switch (c->curve_type)
{
case GTK_CURVE_TYPE_LINEAR:
case GTK_CURVE_TYPE_SPLINE:
if (distance > MIN_DISTANCE)
{
/* insert a new control point */
if (c->num_ctlpoints > 0)
{
cx = project (c->ctlpoint[closest_point][0], min_x,
c->max_x, width);
if (x > cx)
++closest_point;
}
++c->num_ctlpoints;
c->ctlpoint =
g_realloc (c->ctlpoint,
c->num_ctlpoints * sizeof (*c->ctlpoint));
for (i = c->num_ctlpoints - 1; i > closest_point; --i)
memcpy (c->ctlpoint + i, c->ctlpoint + i - 1,
sizeof (*c->ctlpoint));
}
c->grab_point = closest_point;
c->ctlpoint[c->grab_point][0] =
unproject (x, min_x, c->max_x, width);
c->ctlpoint[c->grab_point][1] =
unproject (height - y, c->min_y, c->max_y, height);
gtk_curve_interpolate (c, width, height);
break;
case GTK_CURVE_TYPE_FREE:
c->point[x].x = RADIUS + x;
c->point[x].y = RADIUS + y;
c->grab_point = x;
c->last = y;
break;
}
gtk_curve_draw (c, width, height);
retval = TRUE;
break;
case GDK_BUTTON_RELEASE:
gtk_grab_remove (widget);
/* delete inactive points: */
if (c->curve_type != GTK_CURVE_TYPE_FREE)
{
for (src = dst = 0; src < c->num_ctlpoints; ++src)
{
if (c->ctlpoint[src][0] >= min_x)
{
memcpy (c->ctlpoint + dst, c->ctlpoint + src,
sizeof (*c->ctlpoint));
++dst;
}
}
if (dst < src)
{
c->num_ctlpoints -= (src - dst);
if (c->num_ctlpoints <= 0)
{
c->num_ctlpoints = 1;
c->ctlpoint[0][0] = min_x;
c->ctlpoint[0][1] = c->min_y;
gtk_curve_interpolate (c, width, height);
gtk_curve_draw (c, width, height);
}
c->ctlpoint =
g_realloc (c->ctlpoint,
c->num_ctlpoints * sizeof (*c->ctlpoint));
}
}
new_type = GDK_FLEUR;
c->grab_point = -1;
retval = TRUE;
break;
case GDK_MOTION_NOTIFY:
mevent = (GdkEventMotion *) event;
switch (c->curve_type)
{
case GTK_CURVE_TYPE_LINEAR:
case GTK_CURVE_TYPE_SPLINE:
if (c->grab_point == -1)
{
/* if no point is grabbed... */
if (distance <= MIN_DISTANCE)
new_type = GDK_FLEUR;
else
new_type = GDK_TCROSS;
}
else
{
/* drag the grabbed point */
new_type = GDK_TCROSS;
leftbound = -MIN_DISTANCE;
if (c->grab_point > 0)
leftbound = project (c->ctlpoint[c->grab_point - 1][0],
min_x, c->max_x, width);
rightbound = width + RADIUS * 2 + MIN_DISTANCE;
if (c->grab_point + 1 < c->num_ctlpoints)
rightbound = project (c->ctlpoint[c->grab_point + 1][0],
min_x, c->max_x, width);
if (tx <= leftbound || tx >= rightbound
|| ty > height + RADIUS * 2 + MIN_DISTANCE
|| ty < -MIN_DISTANCE)
c->ctlpoint[c->grab_point][0] = min_x - 1.0;
else
{
rx = unproject (x, min_x, c->max_x, width);
ry = unproject (height - y, c->min_y, c->max_y, height);
c->ctlpoint[c->grab_point][0] = rx;
c->ctlpoint[c->grab_point][1] = ry;
}
gtk_curve_interpolate (c, width, height);
gtk_curve_draw (c, width, height);
}
break;
case GTK_CURVE_TYPE_FREE:
if (c->grab_point != -1)
{
if (c->grab_point > x)
{
x1 = x;
x2 = c->grab_point;
y1 = y;
y2 = c->last;
}
else
{
x1 = c->grab_point;
x2 = x;
y1 = c->last;
y2 = y;
}
if (x2 != x1)
for (i = x1; i <= x2; i++)
{
c->point[i].x = RADIUS + i;
c->point[i].y = RADIUS +
(y1 + ((y2 - y1) * (i - x1)) / (x2 - x1));
}
else
{
c->point[x].x = RADIUS + x;
c->point[x].y = RADIUS + y;
}
c->grab_point = x;
c->last = y;
gtk_curve_draw (c, width, height);
}
if (mevent->state & GDK_BUTTON1_MASK)
new_type = GDK_TCROSS;
else
new_type = GDK_PENCIL;
break;
}
if (new_type != (GdkCursorType) c->cursor_type)
{
GdkCursor *cursor;
c->cursor_type = new_type;
cursor = gdk_cursor_new_for_display (gtk_widget_get_display (w),
c->cursor_type);
gdk_window_set_cursor (w->window, cursor);
gdk_cursor_unref (cursor);
}
retval = TRUE;
break;
default:
break;
}
return retval;
}
void
gtk_curve_set_curve_type (GtkCurve *c, GtkCurveType new_type)
{
gfloat rx, dx;
gint x, i;
if (new_type != c->curve_type)
{
gint width, height;
width = GTK_WIDGET (c)->allocation.width - RADIUS * 2;
height = GTK_WIDGET (c)->allocation.height - RADIUS * 2;
if (new_type == GTK_CURVE_TYPE_FREE)
{
gtk_curve_interpolate (c, width, height);
c->curve_type = new_type;
}
else if (c->curve_type == GTK_CURVE_TYPE_FREE)
{
if (c->ctlpoint)
g_free (c->ctlpoint);
c->num_ctlpoints = 9;
c->ctlpoint = g_malloc (c->num_ctlpoints * sizeof (*c->ctlpoint));
rx = 0.0;
dx = (width - 1) / (gfloat) (c->num_ctlpoints - 1);
for (i = 0; i < c->num_ctlpoints; ++i, rx += dx)
{
x = (int) (rx + 0.5);
c->ctlpoint[i][0] =
unproject (x, c->min_x, c->max_x, width);
c->ctlpoint[i][1] =
unproject (RADIUS + height - c->point[x].y,
c->min_y, c->max_y, height);
}
c->curve_type = new_type;
gtk_curve_interpolate (c, width, height);
}
else
{
c->curve_type = new_type;
gtk_curve_interpolate (c, width, height);
}
g_signal_emit (c, curve_type_changed_signal, 0);
g_object_notify (G_OBJECT (c), "curve-type");
gtk_curve_draw (c, width, height);
}
}
static void
gtk_curve_size_graph (GtkCurve *curve)
{
gint width, height;
gfloat aspect;
GdkScreen *screen = gtk_widget_get_screen (GTK_WIDGET (curve));
width = (curve->max_x - curve->min_x) + 1;
height = (curve->max_y - curve->min_y) + 1;
aspect = width / (gfloat) height;
if (width > gdk_screen_get_width (screen) / 4)
width = gdk_screen_get_width (screen) / 4;
if (height > gdk_screen_get_height (screen) / 4)
height = gdk_screen_get_height (screen) / 4;
if (aspect < 1.0)
width = height * aspect;
else
height = width / aspect;
gtk_widget_set_size_request (GTK_WIDGET (curve),
width + RADIUS * 2,
height + RADIUS * 2);
}
static void
gtk_curve_reset_vector (GtkCurve *curve)
{
if (curve->ctlpoint)
g_free (curve->ctlpoint);
curve->num_ctlpoints = 2;
curve->ctlpoint = g_malloc (2 * sizeof (curve->ctlpoint[0]));
curve->ctlpoint[0][0] = curve->min_x;
curve->ctlpoint[0][1] = curve->min_y;
curve->ctlpoint[1][0] = curve->max_x;
curve->ctlpoint[1][1] = curve->max_y;
if (curve->pixmap)
{
gint width, height;
width = GTK_WIDGET (curve)->allocation.width - RADIUS * 2;
height = GTK_WIDGET (curve)->allocation.height - RADIUS * 2;
if (curve->curve_type == GTK_CURVE_TYPE_FREE)
{
curve->curve_type = GTK_CURVE_TYPE_LINEAR;
gtk_curve_interpolate (curve, width, height);
curve->curve_type = GTK_CURVE_TYPE_FREE;
}
else
gtk_curve_interpolate (curve, width, height);
gtk_curve_draw (curve, width, height);
}
}
void
gtk_curve_reset (GtkCurve *c)
{
GtkCurveType old_type;
old_type = c->curve_type;
c->curve_type = GTK_CURVE_TYPE_SPLINE;
gtk_curve_reset_vector (c);
if (old_type != GTK_CURVE_TYPE_SPLINE)
{
g_signal_emit (c, curve_type_changed_signal, 0);
g_object_notify (G_OBJECT (c), "curve-type");
}
}
void
gtk_curve_set_gamma (GtkCurve *c, gfloat gamma)
{
gfloat x, one_over_gamma, height;
GtkCurveType old_type;
gint i;
if (c->num_points < 2)
return;
old_type = c->curve_type;
c->curve_type = GTK_CURVE_TYPE_FREE;
if (gamma <= 0)
one_over_gamma = 1.0;
else
one_over_gamma = 1.0 / gamma;
height = c->height;
for (i = 0; i < c->num_points; ++i)
{
x = (gfloat) i / (c->num_points - 1);
c->point[i].x = RADIUS + i;
c->point[i].y =
RADIUS + (height * (1.0 - pow (x, one_over_gamma)) + 0.5);
}
if (old_type != GTK_CURVE_TYPE_FREE)
g_signal_emit (c, curve_type_changed_signal, 0);
gtk_curve_draw (c, c->num_points, c->height);
}
void
gtk_curve_set_range (GtkCurve *curve,
gfloat min_x,
gfloat max_x,
gfloat min_y,
gfloat max_y)
{
g_object_freeze_notify (G_OBJECT (curve));
if (curve->min_x != min_x) {
curve->min_x = min_x;
g_object_notify (G_OBJECT (curve), "min-x");
}
if (curve->max_x != max_x) {
curve->max_x = max_x;
g_object_notify (G_OBJECT (curve), "max-x");
}
if (curve->min_y != min_y) {
curve->min_y = min_y;
g_object_notify (G_OBJECT (curve), "min-y");
}
if (curve->max_y != max_y) {
curve->max_y = max_y;
g_object_notify (G_OBJECT (curve), "max-y");
}
g_object_thaw_notify (G_OBJECT (curve));
gtk_curve_size_graph (curve);
gtk_curve_reset_vector (curve);
}
void
gtk_curve_set_vector (GtkCurve *c, int veclen, gfloat vector[])
{
GtkCurveType old_type;
gfloat rx, dx, ry;
gint i, height;
GdkScreen *screen = gtk_widget_get_screen (GTK_WIDGET (c));
old_type = c->curve_type;
c->curve_type = GTK_CURVE_TYPE_FREE;
if (c->point)
height = GTK_WIDGET (c)->allocation.height - RADIUS * 2;
else
{
height = (c->max_y - c->min_y);
if (height > gdk_screen_get_height (screen) / 4)
height = gdk_screen_get_height (screen) / 4;
c->height = height;
c->num_points = veclen;
c->point = g_malloc (c->num_points * sizeof (c->point[0]));
}
rx = 0;
dx = (veclen - 1.0) / (c->num_points - 1.0);
for (i = 0; i < c->num_points; ++i, rx += dx)
{
ry = vector[(int) (rx + 0.5)];
if (ry > c->max_y) ry = c->max_y;
if (ry < c->min_y) ry = c->min_y;
c->point[i].x = RADIUS + i;
c->point[i].y =
RADIUS + height - project (ry, c->min_y, c->max_y, height);
}
if (old_type != GTK_CURVE_TYPE_FREE)
{
g_signal_emit (c, curve_type_changed_signal, 0);
g_object_notify (G_OBJECT (c), "curve-type");
}
gtk_curve_draw (c, c->num_points, height);
}
void
gtk_curve_get_vector (GtkCurve *c, int veclen, gfloat vector[])
{
gfloat rx, ry, dx, dy, min_x, delta_x, *mem, *xv, *yv, *y2v, prev;
gint dst, i, x, next, num_active_ctlpoints = 0, first_active = -1;
min_x = c->min_x;
if (c->curve_type != GTK_CURVE_TYPE_FREE)
{
/* count active points: */
prev = min_x - 1.0;
for (i = num_active_ctlpoints = 0; i < c->num_ctlpoints; ++i)
if (c->ctlpoint[i][0] > prev)
{
if (first_active < 0)
first_active = i;
prev = c->ctlpoint[i][0];
++num_active_ctlpoints;
}
/* handle degenerate case: */
if (num_active_ctlpoints < 2)
{
if (num_active_ctlpoints > 0)
ry = c->ctlpoint[first_active][1];
else
ry = c->min_y;
if (ry < c->min_y) ry = c->min_y;
if (ry > c->max_y) ry = c->max_y;
for (x = 0; x < veclen; ++x)
vector[x] = ry;
return;
}
}
switch (c->curve_type)
{
case GTK_CURVE_TYPE_SPLINE:
mem = g_malloc (3 * num_active_ctlpoints * sizeof (gfloat));
xv = mem;
yv = mem + num_active_ctlpoints;
y2v = mem + 2*num_active_ctlpoints;
prev = min_x - 1.0;
for (i = dst = 0; i < c->num_ctlpoints; ++i)
if (c->ctlpoint[i][0] > prev)
{
prev = c->ctlpoint[i][0];
xv[dst] = c->ctlpoint[i][0];
yv[dst] = c->ctlpoint[i][1];
++dst;
}
spline_solve (num_active_ctlpoints, xv, yv, y2v);
rx = min_x;
dx = (c->max_x - min_x) / (veclen - 1);
for (x = 0; x < veclen; ++x, rx += dx)
{
ry = spline_eval (num_active_ctlpoints, xv, yv, y2v, rx);
if (ry < c->min_y) ry = c->min_y;
if (ry > c->max_y) ry = c->max_y;
vector[x] = ry;
}
g_free (mem);
break;
case GTK_CURVE_TYPE_LINEAR:
dx = (c->max_x - min_x) / (veclen - 1);
rx = min_x;
ry = c->min_y;
dy = 0.0;
i = first_active;
for (x = 0; x < veclen; ++x, rx += dx)
{
if (rx >= c->ctlpoint[i][0])
{
if (rx > c->ctlpoint[i][0])
ry = c->min_y;
dy = 0.0;
next = i + 1;
while (next < c->num_ctlpoints
&& c->ctlpoint[next][0] <= c->ctlpoint[i][0])
++next;
if (next < c->num_ctlpoints)
{
delta_x = c->ctlpoint[next][0] - c->ctlpoint[i][0];
dy = ((c->ctlpoint[next][1] - c->ctlpoint[i][1])
/ delta_x);
dy *= dx;
ry = c->ctlpoint[i][1];
i = next;
}
}
vector[x] = ry;
ry += dy;
}
break;
case GTK_CURVE_TYPE_FREE:
if (c->point)
{
rx = 0.0;
dx = c->num_points / (double) veclen;
for (x = 0; x < veclen; ++x, rx += dx)
vector[x] = unproject (RADIUS + c->height - c->point[(int) rx].y,
c->min_y, c->max_y,
c->height);
}
else
memset (vector, 0, veclen * sizeof (vector[0]));
break;
}
}
GtkWidget*
gtk_curve_new (void)
{
return g_object_new (GTK_TYPE_CURVE, NULL);
}
static void
gtk_curve_finalize (GObject *object)
{
GtkCurve *curve;
g_return_if_fail (GTK_IS_CURVE (object));
curve = GTK_CURVE (object);
if (curve->pixmap)
g_object_unref (curve->pixmap);
if (curve->point)
g_free (curve->point);
if (curve->ctlpoint)
g_free (curve->ctlpoint);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
#define __GTK_CURVE_C__
#include "gtkaliasdef.c"
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