diff options
Diffstat (limited to 'gtk/gtkcurve.c')
| -rw-r--r-- | gtk/gtkcurve.c | 1039 |
1 files changed, 0 insertions, 1039 deletions
diff --git a/gtk/gtkcurve.c b/gtk/gtkcurve.c deleted file mode 100644 index e1304dbd52..0000000000 --- a/gtk/gtkcurve.c +++ /dev/null @@ -1,1039 +0,0 @@ -/* 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/. - */ - -#undef GTK_DISABLE_DEPRECATED - -#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_SPLINE, - 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; - 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) - { - 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) -{ - 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); - g_free (curve->point); - g_free (curve->ctlpoint); - - G_OBJECT_CLASS (parent_class)->finalize (object); -} - -#define __GTK_CURVE_C__ -#include "gtkaliasdef.c" |