mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-12-25 05:01:09 +00:00
861 lines
21 KiB
C
861 lines
21 KiB
C
/* 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 Library 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
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the Free
|
|
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
#include <string.h>
|
|
#include <math.h>
|
|
|
|
#include "gtkcurve.h"
|
|
#include "gtkdrawingarea.h"
|
|
#include "gtkmain.h"
|
|
#include "gtkradiobutton.h"
|
|
#include "gtksignal.h"
|
|
#include "gtktable.h"
|
|
|
|
#define BOUNDS(a,x,y) (((a) < (x)) ? (x) : (((a) > (y)) ? (y) : (a)))
|
|
#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)
|
|
|
|
static GtkDrawingAreaClass *parent_class = NULL;
|
|
static gint 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_destroy (GtkObject *object);
|
|
|
|
|
|
guint
|
|
gtk_curve_get_type (void)
|
|
{
|
|
static guint curve_type = 0;
|
|
|
|
if (!curve_type)
|
|
{
|
|
GtkTypeInfo curve_info =
|
|
{
|
|
"GtkCurve",
|
|
sizeof (GtkCurve),
|
|
sizeof (GtkCurveClass),
|
|
(GtkClassInitFunc) gtk_curve_class_init,
|
|
(GtkObjectInitFunc) gtk_curve_init,
|
|
(GtkArgFunc) NULL,
|
|
};
|
|
|
|
curve_type = gtk_type_unique (gtk_drawing_area_get_type (), &curve_info);
|
|
}
|
|
return curve_type;
|
|
}
|
|
|
|
static void
|
|
gtk_curve_class_init (GtkCurveClass *class)
|
|
{
|
|
GtkObjectClass *object_class;
|
|
|
|
parent_class = gtk_type_class (gtk_drawing_area_get_type ());
|
|
|
|
object_class = (GtkObjectClass *) class;
|
|
|
|
curve_type_changed_signal =
|
|
gtk_signal_new ("curve_type_changed", GTK_RUN_FIRST, object_class->type,
|
|
GTK_SIGNAL_OFFSET (GtkCurveClass, curve_type_changed),
|
|
gtk_signal_default_marshaller, GTK_TYPE_NONE, 0);
|
|
gtk_object_class_add_signals (object_class, &curve_type_changed_signal, 1);
|
|
|
|
object_class->destroy = gtk_curve_destroy;
|
|
}
|
|
|
|
static void
|
|
gtk_curve_init (GtkCurve *curve)
|
|
{
|
|
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 = 0;
|
|
|
|
curve->num_ctlpoints = 0;
|
|
curve->ctlpoint = NULL;
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
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: */
|
|
gdk_draw_rectangle (c->pixmap, style->bg_gc[state], TRUE,
|
|
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_pixmap (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;
|
|
GdkEventButton *bevent;
|
|
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;
|
|
|
|
w = GTK_WIDGET (c);
|
|
width = w->allocation.width - RADIUS * 2;
|
|
height = w->allocation.height - RADIUS * 2;
|
|
|
|
/* get the pointer position */
|
|
gdk_window_get_pointer (w->window, &tx, &ty, NULL);
|
|
x = BOUNDS ((tx - RADIUS), 0, width);
|
|
y = BOUNDS ((ty - RADIUS), 0, height);
|
|
|
|
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)
|
|
gdk_pixmap_destroy (c->pixmap);
|
|
c->pixmap = 0;
|
|
/* 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);
|
|
|
|
bevent = (GdkEventButton *) event;
|
|
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);
|
|
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;
|
|
break;
|
|
|
|
case GDK_MOTION_NOTIFY:
|
|
mevent = (GdkEventMotion *) event;
|
|
if (mevent->is_hint)
|
|
{
|
|
mevent->x = tx;
|
|
mevent->y = ty;
|
|
}
|
|
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 (c->cursor_type);
|
|
gdk_window_set_cursor (w->window, cursor);
|
|
gdk_cursor_destroy (cursor);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
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);
|
|
}
|
|
gtk_signal_emit (GTK_OBJECT (c), curve_type_changed_signal);
|
|
gtk_curve_draw (c, width, height);
|
|
}
|
|
}
|
|
|
|
static void
|
|
gtk_curve_size_graph (GtkCurve *curve)
|
|
{
|
|
gint width, height;
|
|
gfloat aspect;
|
|
|
|
width = (curve->max_x - curve->min_x) + 1;
|
|
height = (curve->max_y - curve->min_y) + 1;
|
|
aspect = width / (gfloat) height;
|
|
if (width > gdk_screen_width () / 4)
|
|
width = gdk_screen_width () / 4;
|
|
if (height > gdk_screen_height () / 4)
|
|
height = gdk_screen_height () / 4;
|
|
|
|
if (aspect < 1.0)
|
|
width = height * aspect;
|
|
else
|
|
height = width / aspect;
|
|
|
|
gtk_drawing_area_size (GTK_DRAWING_AREA (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)
|
|
gtk_signal_emit (GTK_OBJECT (c), curve_type_changed_signal);
|
|
}
|
|
|
|
void
|
|
gtk_curve_set_gamma (GtkCurve *c, gfloat gamma)
|
|
{
|
|
gfloat x, one_over_gamma, height, one_over_width;
|
|
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;
|
|
one_over_width = 1.0 / (c->num_points - 1);
|
|
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)
|
|
gtk_signal_emit (GTK_OBJECT (c), curve_type_changed_signal);
|
|
|
|
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)
|
|
{
|
|
curve->min_x = min_x;
|
|
curve->max_x = max_x;
|
|
curve->min_y = min_y;
|
|
curve->max_y = max_y;
|
|
|
|
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;
|
|
|
|
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_height () / 4)
|
|
height = gdk_screen_height () / 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)
|
|
gtk_signal_emit (GTK_OBJECT (c), curve_type_changed_signal);
|
|
|
|
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)
|
|
{
|
|
GtkCurve *curve;
|
|
gint old_mask;
|
|
|
|
curve = gtk_type_new (gtk_curve_get_type ());
|
|
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);
|
|
gtk_signal_connect (GTK_OBJECT (curve), "event",
|
|
(GtkSignalFunc) gtk_curve_graph_events, curve);
|
|
gtk_curve_size_graph (curve);
|
|
|
|
return GTK_WIDGET (curve);
|
|
}
|
|
|
|
static void
|
|
gtk_curve_destroy (GtkObject *object)
|
|
{
|
|
GtkCurve *curve;
|
|
|
|
g_return_if_fail (object != NULL);
|
|
g_return_if_fail (GTK_IS_CURVE (object));
|
|
|
|
curve = GTK_CURVE (object);
|
|
if (curve->pixmap)
|
|
gdk_pixmap_destroy (curve->pixmap);
|
|
if (curve->point)
|
|
g_free (curve->point);
|
|
if (curve->ctlpoint)
|
|
g_free (curve->ctlpoint);
|
|
|
|
if (GTK_OBJECT_CLASS (parent_class)->destroy)
|
|
(*GTK_OBJECT_CLASS (parent_class)->destroy) (object);
|
|
}
|