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358
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1 /* GTK - The GIMP Toolkit
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2 * Copyright (C) 1997 David Mosberger
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3 *
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4 * This library is free software; you can redistribute it and/or
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5 * modify it under the terms of the GNU Library General Public
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6 * License as published by the Free Software Foundation; either
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7 * version 2 of the License, or (at your option) any later version.
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8 *
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9 * This library is distributed in the hope that it will be useful,
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10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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12 * Library General Public License for more details.
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13 *
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14 * You should have received a copy of the GNU Library General Public
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15 * License along with this library; if not, write to the
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16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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17 * Boston, MA 02111-1307, USA.
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18 */
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19
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20 /*
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21 * Modified by the GTK+ Team and others 1997-1999. See the AUTHORS
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22 * file for a list of people on the GTK+ Team. See the ChangeLog
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23 * files for a list of changes. These files are distributed with
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24 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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25 */
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26
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27 #include <stdlib.h>
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28 #include <string.h>
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29 #include <math.h>
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30
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31 #include "xs_curve.h"
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32 #include <gtk/gtkdrawingarea.h>
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33 #include <gtk/gtkmain.h>
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34 #include <gtk/gtksignal.h>
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35 /*
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36 #include <gtk/gtktable.h>
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37 #include <gtk/gtkradiobutton.h>
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38 */
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39
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40 #define RADIUS 3 /* radius of the control points */
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41 #define MIN_DISTANCE 8 /* min distance between control points */
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42
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43 #define GRAPH_MASK (GDK_EXPOSURE_MASK | \
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44 GDK_POINTER_MOTION_MASK | \
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45 GDK_POINTER_MOTION_HINT_MASK | \
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46 GDK_ENTER_NOTIFY_MASK | \
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47 GDK_BUTTON_PRESS_MASK | \
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48 GDK_BUTTON_RELEASE_MASK | \
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49 GDK_BUTTON1_MOTION_MASK)
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50
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51 enum {
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52 ARG_0,
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53 ARG_CURVE_TYPE,
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54 ARG_MIN_X,
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55 ARG_MAX_X,
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56 ARG_MIN_Y,
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57 ARG_MAX_Y
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58 };
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59
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60 static GtkDrawingAreaClass *parent_class = NULL;
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61 static guint curve_type_changed_signal = 0;
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62
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63
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64 /* forward declarations: */
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65 static void gtk_curve_class_init (GtkCurveClass *class);
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66 static void gtk_curve_init (GtkCurve *curve);
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67 static void gtk_curve_set_arg (GtkObject *object,
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68 GtkArg *arg,
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69 guint arg_id);
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70 static void gtk_curve_get_arg (GtkObject *object,
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71 GtkArg *arg,
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72 guint arg_id);
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73 static void gtk_curve_finalize (GtkObject *object);
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74 static gint gtk_curve_graph_events (GtkWidget *widget,
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75 GdkEvent *event,
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76 GtkCurve *c);
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77 static void gtk_curve_size_graph (GtkCurve *curve);
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78
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79 GtkType
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80 gtk_curve_get_type (void)
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81 {
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82 static GtkType curve_type = 0;
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83
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84 if (!curve_type)
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85 {
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86 static const GtkTypeInfo curve_info =
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87 {
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88 "GtkCurve",
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89 sizeof (GtkCurve),
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90 sizeof (GtkCurveClass),
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91 (GtkClassInitFunc) gtk_curve_class_init,
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92 (GtkObjectInitFunc) gtk_curve_init,
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93 /* reserved_1 */ NULL,
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94 /* reserved_2 */ NULL,
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95 (GtkClassInitFunc) NULL,
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96 };
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97
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98 curve_type = gtk_type_unique (GTK_TYPE_DRAWING_AREA, &curve_info);
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99 }
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100 return curve_type;
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101 }
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102
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103 static void
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104 gtk_curve_class_init (GtkCurveClass *class)
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105 {
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106 GtkObjectClass *object_class;
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107
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108 parent_class = gtk_type_class (GTK_TYPE_DRAWING_AREA);
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109
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110 object_class = (GtkObjectClass *) class;
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111
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112 object_class->set_arg = gtk_curve_set_arg;
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113 object_class->get_arg = gtk_curve_get_arg;
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114 object_class->finalize = gtk_curve_finalize;
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115
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116 curve_type_changed_signal =
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117 gtk_signal_new ("curve_type_changed", GTK_RUN_FIRST, object_class->type,
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118 GTK_SIGNAL_OFFSET (GtkCurveClass, curve_type_changed),
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119 gtk_marshal_NONE__NONE, GTK_TYPE_NONE, 0);
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120 gtk_object_class_add_signals (object_class, &curve_type_changed_signal, 1);
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121
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122 gtk_object_add_arg_type ("GtkCurve::curve_type", GTK_TYPE_CURVE_TYPE,
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123 GTK_ARG_READWRITE, ARG_CURVE_TYPE);
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124 gtk_object_add_arg_type ("GtkCurve::min_x", GTK_TYPE_FLOAT,
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125 GTK_ARG_READWRITE, ARG_MIN_X);
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126 gtk_object_add_arg_type ("GtkCurve::max_x", GTK_TYPE_FLOAT,
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127 GTK_ARG_READWRITE, ARG_MAX_X);
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128 gtk_object_add_arg_type ("GtkCurve::min_y", GTK_TYPE_FLOAT,
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129 GTK_ARG_READWRITE, ARG_MIN_Y);
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130 gtk_object_add_arg_type ("GtkCurve::max_y", GTK_TYPE_FLOAT,
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131 GTK_ARG_READWRITE, ARG_MAX_Y);
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132 }
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133
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134 static void
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135 gtk_curve_init (GtkCurve *curve)
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136 {
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137 gint old_mask;
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138
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139 curve->cursor_type = GDK_TOP_LEFT_ARROW;
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140 curve->pixmap = NULL;
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141 curve->curve_type = GTK_CURVE_TYPE_SPLINE;
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142 curve->height = 0;
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143 curve->grab_point = -1;
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144
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145 curve->num_points = 0;
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146 curve->point = 0;
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147
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148 curve->num_ctlpoints = 0;
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149 curve->ctlpoint = NULL;
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150
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151 curve->min_x = 0.0;
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152 curve->max_x = 1.0;
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153 curve->min_y = 0.0;
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154 curve->max_y = 1.0;
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155
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156 old_mask = gtk_widget_get_events (GTK_WIDGET (curve));
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157 gtk_widget_set_events (GTK_WIDGET (curve), old_mask | GRAPH_MASK);
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158 gtk_signal_connect (GTK_OBJECT (curve), "event",
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159 (GtkSignalFunc) gtk_curve_graph_events, curve);
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160 gtk_curve_size_graph (curve);
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161 }
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162
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163 static void
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164 gtk_curve_set_arg (GtkObject *object,
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165 GtkArg *arg,
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166 guint arg_id)
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167 {
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168 GtkCurve *curve = GTK_CURVE (object);
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169
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170 switch (arg_id)
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171 {
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172 case ARG_CURVE_TYPE:
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173 gtk_curve_set_curve_type (curve, GTK_VALUE_ENUM (*arg));
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174 break;
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175 case ARG_MIN_X:
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176 gtk_curve_set_range (curve, GTK_VALUE_FLOAT (*arg), curve->max_x,
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177 curve->min_y, curve->max_y);
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178 break;
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179 case ARG_MAX_X:
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180 gtk_curve_set_range (curve, curve->min_x, GTK_VALUE_FLOAT (*arg),
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181 curve->min_y, curve->max_y);
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182 break;
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183 case ARG_MIN_Y:
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184 gtk_curve_set_range (curve, curve->min_x, curve->max_x,
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185 GTK_VALUE_FLOAT (*arg), curve->max_y);
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186 break;
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187 case ARG_MAX_Y:
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188 gtk_curve_set_range (curve, curve->min_x, curve->max_x,
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189 curve->min_y, GTK_VALUE_FLOAT (*arg));
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190 break;
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191 }
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192 }
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193
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194 static void
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195 gtk_curve_get_arg (GtkObject *object,
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196 GtkArg *arg,
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197 guint arg_id)
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198 {
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199 GtkCurve *curve = GTK_CURVE (object);
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200
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201 switch (arg_id)
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202 {
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203 case ARG_CURVE_TYPE:
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204 GTK_VALUE_ENUM (*arg) = curve->curve_type;
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205 break;
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206 case ARG_MIN_X:
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207 GTK_VALUE_FLOAT (*arg) = curve->min_x;
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208 break;
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209 case ARG_MAX_X:
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210 GTK_VALUE_FLOAT (*arg) = curve->max_x;
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211 break;
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212 case ARG_MIN_Y:
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213 GTK_VALUE_FLOAT (*arg) = curve->min_y;
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214 break;
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215 case ARG_MAX_Y:
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216 GTK_VALUE_FLOAT (*arg) = curve->max_y;
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217 break;
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218 default:
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219 arg->type = GTK_TYPE_INVALID;
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220 break;
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221 }
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222 }
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223
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224 static int
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225 project (gfloat value, gfloat min, gfloat max, int norm)
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226 {
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227 return (norm - 1) * ((value - min) / (max - min)) + 0.5;
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228 }
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229
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230 static gfloat
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231 unproject (gint value, gfloat min, gfloat max, int norm)
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232 {
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233 return value / (gfloat) (norm - 1) * (max - min) + min;
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234 }
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235
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236 /* Solve the tridiagonal equation system that determines the second
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237 derivatives for the interpolation points. (Based on Numerical
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238 Recipies 2nd Edition.) */
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239 static void
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240 spline_solve (int n, gfloat x[], gfloat y[], gfloat y2[])
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241 {
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242 gfloat p, sig, *u;
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243 gint i, k;
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244
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245 u = g_malloc ((n - 1) * sizeof (u[0]));
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246
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247 y2[0] = u[0] = 0.0; /* set lower boundary condition to "natural" */
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248
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249 for (i = 1; i < n - 1; ++i)
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250 {
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251 sig = (x[i] - x[i - 1]) / (x[i + 1] - x[i - 1]);
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252 p = sig * y2[i - 1] + 2.0;
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253 y2[i] = (sig - 1.0) / p;
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254 u[i] = ((y[i + 1] - y[i])
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255 / (x[i + 1] - x[i]) - (y[i] - y[i - 1]) / (x[i] - x[i - 1]));
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256 u[i] = (6.0 * u[i] / (x[i + 1] - x[i - 1]) - sig * u[i - 1]) / p;
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257 }
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258
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259 y2[n - 1] = 0.0;
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260 for (k = n - 2; k >= 0; --k)
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261 y2[k] = y2[k] * y2[k + 1] + u[k];
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262
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263 g_free (u);
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264 }
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265
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266 static gfloat
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267 spline_eval (int n, gfloat x[], gfloat y[], gfloat y2[], gfloat val)
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268 {
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269 gint k_lo, k_hi, k;
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270 gfloat h, b, a;
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271
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272 /* do a binary search for the right interval: */
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273 k_lo = 0; k_hi = n - 1;
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274 while (k_hi - k_lo > 1)
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275 {
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276 k = (k_hi + k_lo) / 2;
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277 if (x[k] > val)
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278 k_hi = k;
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279 else
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280 k_lo = k;
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281 }
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282
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283 h = x[k_hi] - x[k_lo];
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284 g_assert (h > 0.0);
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285
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286 a = (x[k_hi] - val) / h;
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287 b = (val - x[k_lo]) / h;
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288 return a*y[k_lo] + b*y[k_hi] +
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289 ((a*a*a - a)*y2[k_lo] + (b*b*b - b)*y2[k_hi]) * (h*h)/6.0;
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290 }
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291
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292 static void
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293 gtk_curve_interpolate (GtkCurve *c, gint width, gint height)
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294 {
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295 gfloat *vector;
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296 int i;
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297
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298 vector = g_malloc (width * sizeof (vector[0]));
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299
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300 gtk_curve_get_vector (c, width, vector);
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301
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302 c->height = height;
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303 if (c->num_points != width)
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304 {
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305 c->num_points = width;
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306 if (c->point)
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307 g_free (c->point);
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308 c->point = g_malloc (c->num_points * sizeof (c->point[0]));
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309 }
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310
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311 for (i = 0; i < width; ++i)
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312 {
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313 c->point[i].x = RADIUS + i;
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314 c->point[i].y = RADIUS + height
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315 - project (vector[i], c->min_y, c->max_y, height);
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316 }
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317
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318 g_free (vector);
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319 }
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320
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321 static void
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322 gtk_curve_draw (GtkCurve *c, gint width, gint height)
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323 {
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324 GtkStateType state;
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325 GtkStyle *style;
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326 gint i;
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327
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328 if (!c->pixmap)
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329 return;
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330
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331 if (c->height != height || c->num_points != width)
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332 gtk_curve_interpolate (c, width, height);
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333
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334 state = GTK_STATE_NORMAL;
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335 if (!GTK_WIDGET_IS_SENSITIVE (GTK_WIDGET (c)))
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336 state = GTK_STATE_INSENSITIVE;
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337
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338 style = GTK_WIDGET (c)->style;
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339
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340 /* clear the pixmap: */
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341 gtk_paint_flat_box (style, c->pixmap, GTK_STATE_NORMAL, GTK_SHADOW_NONE,
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342 NULL, GTK_WIDGET(c), "curve_bg",
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343 0, 0, width + RADIUS * 2, height + RADIUS * 2);
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344 /* draw the grid lines: (XXX make more meaningful) */
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345 for (i = 0; i < 5; i++)
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346 {
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347 gdk_draw_line (c->pixmap, style->dark_gc[state],
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348 RADIUS, i * (height / 4.0) + RADIUS,
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349 width + RADIUS, i * (height / 4.0) + RADIUS);
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350 gdk_draw_line (c->pixmap, style->dark_gc[state],
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351 i * (width / 4.0) + RADIUS, RADIUS,
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352 i * (width / 4.0) + RADIUS, height + RADIUS);
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353 }
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354
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355 gdk_draw_points (c->pixmap, style->fg_gc[state], c->point, c->num_points);
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356 if (c->curve_type != GTK_CURVE_TYPE_FREE)
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357 for (i = 0; i < c->num_ctlpoints; ++i)
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358 {
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359 gint x, y;
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360
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361 if (c->ctlpoint[i][0] < c->min_x)
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362 continue;
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363
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364 x = project (c->ctlpoint[i][0], c->min_x, c->max_x,
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365 width);
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366 y = height -
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367 project (c->ctlpoint[i][1], c->min_y, c->max_y,
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368 height);
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369
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370 /* draw a bullet: */
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371 gdk_draw_arc (c->pixmap, style->fg_gc[state], TRUE, x, y,
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372 RADIUS * 2, RADIUS*2, 0, 360*64);
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373 }
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374 gdk_draw_pixmap (GTK_WIDGET (c)->window, style->fg_gc[state], c->pixmap,
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375 0, 0, 0, 0, width + RADIUS * 2, height + RADIUS * 2);
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376 }
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377
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378 static gint
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379 gtk_curve_graph_events (GtkWidget *widget, GdkEvent *event, GtkCurve *c)
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380 {
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381 GdkCursorType new_type = c->cursor_type;
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382 gint i, src, dst, leftbound, rightbound;
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383 GdkEventButton *bevent;
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384 GdkEventMotion *mevent;
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385 GtkWidget *w;
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|
|
386 gint tx, ty;
|
|
|
387 gint cx, x, y, width, height;
|
|
|
388 gint closest_point = 0;
|
|
|
389 gfloat rx, ry, min_x;
|
|
|
390 guint distance;
|
|
|
391 gint x1, x2, y1, y2;
|
|
|
392
|
|
|
393 w = GTK_WIDGET (c);
|
|
|
394 width = w->allocation.width - RADIUS * 2;
|
|
|
395 height = w->allocation.height - RADIUS * 2;
|
|
|
396
|
|
|
397 if ((width < 0) || (height < 0))
|
|
|
398 return FALSE;
|
|
|
399
|
|
|
400 /* get the pointer position */
|
|
|
401 gdk_window_get_pointer (w->window, &tx, &ty, NULL);
|
|
|
402 x = CLAMP ((tx - RADIUS), 0, width-1);
|
|
|
403 y = CLAMP ((ty - RADIUS), 0, height-1);
|
|
|
404
|
|
|
405 min_x = c->min_x;
|
|
|
406
|
|
|
407 distance = ~0U;
|
|
|
408 for (i = 0; i < c->num_ctlpoints; ++i)
|
|
|
409 {
|
|
|
410 cx = project (c->ctlpoint[i][0], min_x, c->max_x, width);
|
|
|
411 if ((guint) abs (x - cx) < distance)
|
|
|
412 {
|
|
|
413 distance = abs (x - cx);
|
|
|
414 closest_point = i;
|
|
|
415 }
|
|
|
416 }
|
|
|
417
|
|
|
418 switch (event->type)
|
|
|
419 {
|
|
|
420 case GDK_CONFIGURE:
|
|
|
421 if (c->pixmap)
|
|
|
422 gdk_pixmap_unref (c->pixmap);
|
|
|
423 c->pixmap = 0;
|
|
|
424 /* fall through */
|
|
|
425 case GDK_EXPOSE:
|
|
|
426 if (!c->pixmap)
|
|
|
427 c->pixmap = gdk_pixmap_new (w->window,
|
|
|
428 w->allocation.width,
|
|
|
429 w->allocation.height, -1);
|
|
|
430 gtk_curve_draw (c, width, height);
|
|
|
431 break;
|
|
|
432
|
|
|
433 case GDK_BUTTON_PRESS:
|
|
|
434 gtk_grab_add (widget);
|
|
|
435
|
|
|
436 bevent = (GdkEventButton *) event;
|
|
|
437 new_type = GDK_TCROSS;
|
|
|
438
|
|
|
439 switch (c->curve_type)
|
|
|
440 {
|
|
|
441 case GTK_CURVE_TYPE_LINEAR:
|
|
|
442 case GTK_CURVE_TYPE_SPLINE:
|
|
|
443 if (distance > MIN_DISTANCE)
|
|
|
444 {
|
|
|
445 /* insert a new control point */
|
|
|
446 if (c->num_ctlpoints > 0)
|
|
|
447 {
|
|
|
448 cx = project (c->ctlpoint[closest_point][0], min_x,
|
|
|
449 c->max_x, width);
|
|
|
450 if (x > cx)
|
|
|
451 ++closest_point;
|
|
|
452 }
|
|
|
453 ++c->num_ctlpoints;
|
|
|
454 c->ctlpoint =
|
|
|
455 g_realloc (c->ctlpoint,
|
|
|
456 c->num_ctlpoints * sizeof (*c->ctlpoint));
|
|
|
457 for (i = c->num_ctlpoints - 1; i > closest_point; --i)
|
|
|
458 memcpy (c->ctlpoint + i, c->ctlpoint + i - 1,
|
|
|
459 sizeof (*c->ctlpoint));
|
|
|
460 }
|
|
|
461 c->grab_point = closest_point;
|
|
|
462 c->ctlpoint[c->grab_point][0] =
|
|
|
463 unproject (x, min_x, c->max_x, width);
|
|
|
464 c->ctlpoint[c->grab_point][1] =
|
|
|
465 unproject (height - y, c->min_y, c->max_y, height);
|
|
|
466
|
|
|
467 gtk_curve_interpolate (c, width, height);
|
|
|
468 break;
|
|
|
469
|
|
|
470 case GTK_CURVE_TYPE_FREE:
|
|
|
471 c->point[x].x = RADIUS + x;
|
|
|
472 c->point[x].y = RADIUS + y;
|
|
|
473 c->grab_point = x;
|
|
|
474 c->last = y;
|
|
|
475 break;
|
|
|
476 }
|
|
|
477 gtk_curve_draw (c, width, height);
|
|
|
478 break;
|
|
|
479
|
|
|
480 case GDK_BUTTON_RELEASE:
|
|
|
481 gtk_grab_remove (widget);
|
|
|
482
|
|
|
483 /* delete inactive points: */
|
|
|
484 if (c->curve_type != GTK_CURVE_TYPE_FREE)
|
|
|
485 {
|
|
|
486 for (src = dst = 0; src < c->num_ctlpoints; ++src)
|
|
|
487 {
|
|
|
488 if (c->ctlpoint[src][0] >= min_x)
|
|
|
489 {
|
|
|
490 memcpy (c->ctlpoint + dst, c->ctlpoint + src,
|
|
|
491 sizeof (*c->ctlpoint));
|
|
|
492 ++dst;
|
|
|
493 }
|
|
|
494 }
|
|
|
495 if (dst < src)
|
|
|
496 {
|
|
|
497 c->num_ctlpoints -= (src - dst);
|
|
|
498 if (c->num_ctlpoints <= 0)
|
|
|
499 {
|
|
|
500 c->num_ctlpoints = 1;
|
|
|
501 c->ctlpoint[0][0] = min_x;
|
|
|
502 c->ctlpoint[0][1] = c->min_y;
|
|
|
503 gtk_curve_interpolate (c, width, height);
|
|
|
504 gtk_curve_draw (c, width, height);
|
|
|
505 }
|
|
|
506 c->ctlpoint =
|
|
|
507 g_realloc (c->ctlpoint,
|
|
|
508 c->num_ctlpoints * sizeof (*c->ctlpoint));
|
|
|
509 }
|
|
|
510 }
|
|
|
511 new_type = GDK_FLEUR;
|
|
|
512 c->grab_point = -1;
|
|
|
513 break;
|
|
|
514
|
|
|
515 case GDK_MOTION_NOTIFY:
|
|
|
516 mevent = (GdkEventMotion *) event;
|
|
|
517
|
|
|
518 switch (c->curve_type)
|
|
|
519 {
|
|
|
520 case GTK_CURVE_TYPE_LINEAR:
|
|
|
521 case GTK_CURVE_TYPE_SPLINE:
|
|
|
522 if (c->grab_point == -1)
|
|
|
523 {
|
|
|
524 /* if no point is grabbed... */
|
|
|
525 if (distance <= MIN_DISTANCE)
|
|
|
526 new_type = GDK_FLEUR;
|
|
|
527 else
|
|
|
528 new_type = GDK_TCROSS;
|
|
|
529 }
|
|
|
530 else
|
|
|
531 {
|
|
|
532 /* drag the grabbed point */
|
|
|
533 new_type = GDK_TCROSS;
|
|
|
534
|
|
|
535 leftbound = -MIN_DISTANCE;
|
|
|
536 if (c->grab_point > 0)
|
|
|
537 leftbound = project (c->ctlpoint[c->grab_point - 1][0],
|
|
|
538 min_x, c->max_x, width);
|
|
|
539
|
|
|
540 rightbound = width + RADIUS * 2 + MIN_DISTANCE;
|
|
|
541 if (c->grab_point + 1 < c->num_ctlpoints)
|
|
|
542 rightbound = project (c->ctlpoint[c->grab_point + 1][0],
|
|
|
543 min_x, c->max_x, width);
|
|
|
544
|
|
|
545 if (tx <= leftbound || tx >= rightbound
|
|
|
546 || ty > height + RADIUS * 2 + MIN_DISTANCE
|
|
|
547 || ty < -MIN_DISTANCE)
|
|
|
548 c->ctlpoint[c->grab_point][0] = min_x - 1.0;
|
|
|
549 else
|
|
|
550 {
|
|
|
551 rx = unproject (x, min_x, c->max_x, width);
|
|
|
552 ry = unproject (height - y, c->min_y, c->max_y, height);
|
|
|
553 c->ctlpoint[c->grab_point][0] = rx;
|
|
|
554 c->ctlpoint[c->grab_point][1] = ry;
|
|
|
555 }
|
|
|
556 gtk_curve_interpolate (c, width, height);
|
|
|
557 gtk_curve_draw (c, width, height);
|
|
|
558 }
|
|
|
559 break;
|
|
|
560
|
|
|
561 case GTK_CURVE_TYPE_FREE:
|
|
|
562 if (c->grab_point != -1)
|
|
|
563 {
|
|
|
564 if (c->grab_point > x)
|
|
|
565 {
|
|
|
566 x1 = x;
|
|
|
567 x2 = c->grab_point;
|
|
|
568 y1 = y;
|
|
|
569 y2 = c->last;
|
|
|
570 }
|
|
|
571 else
|
|
|
572 {
|
|
|
573 x1 = c->grab_point;
|
|
|
574 x2 = x;
|
|
|
575 y1 = c->last;
|
|
|
576 y2 = y;
|
|
|
577 }
|
|
|
578
|
|
|
579 if (x2 != x1)
|
|
|
580 for (i = x1; i <= x2; i++)
|
|
|
581 {
|
|
|
582 c->point[i].x = RADIUS + i;
|
|
|
583 c->point[i].y = RADIUS +
|
|
|
584 (y1 + ((y2 - y1) * (i - x1)) / (x2 - x1));
|
|
|
585 }
|
|
|
586 else
|
|
|
587 {
|
|
|
588 c->point[x].x = RADIUS + x;
|
|
|
589 c->point[x].y = RADIUS + y;
|
|
|
590 }
|
|
|
591 c->grab_point = x;
|
|
|
592 c->last = y;
|
|
|
593 gtk_curve_draw (c, width, height);
|
|
|
594 }
|
|
|
595 if (mevent->state & GDK_BUTTON1_MASK)
|
|
|
596 new_type = GDK_TCROSS;
|
|
|
597 else
|
|
|
598 new_type = GDK_PENCIL;
|
|
|
599 break;
|
|
|
600 }
|
|
|
601 if (new_type != (GdkCursorType) c->cursor_type)
|
|
|
602 {
|
|
|
603 GdkCursor *cursor;
|
|
|
604
|
|
|
605 c->cursor_type = new_type;
|
|
|
606
|
|
|
607 cursor = gdk_cursor_new (c->cursor_type);
|
|
|
608 gdk_window_set_cursor (w->window, cursor);
|
|
|
609 gdk_cursor_destroy (cursor);
|
|
|
610 }
|
|
|
611 break;
|
|
|
612
|
|
|
613 default:
|
|
|
614 break;
|
|
|
615 }
|
|
|
616 return FALSE;
|
|
|
617 }
|
|
|
618
|
|
|
619 void
|
|
|
620 gtk_curve_set_curve_type (GtkCurve *c, GtkCurveType new_type)
|
|
|
621 {
|
|
|
622 gfloat rx, dx;
|
|
|
623 gint x, i;
|
|
|
624
|
|
|
625 if (new_type != c->curve_type)
|
|
|
626 {
|
|
|
627 gint width, height;
|
|
|
628
|
|
|
629 width = GTK_WIDGET(c)->allocation.width - RADIUS * 2;
|
|
|
630 height = GTK_WIDGET(c)->allocation.height - RADIUS * 2;
|
|
|
631
|
|
|
632 if (new_type == GTK_CURVE_TYPE_FREE)
|
|
|
633 {
|
|
|
634 gtk_curve_interpolate (c, width, height);
|
|
|
635 c->curve_type = new_type;
|
|
|
636 }
|
|
|
637 else if (c->curve_type == GTK_CURVE_TYPE_FREE)
|
|
|
638 {
|
|
|
639 if (c->ctlpoint)
|
|
|
640 g_free (c->ctlpoint);
|
|
|
641 c->num_ctlpoints = 9;
|
|
|
642 c->ctlpoint = g_malloc (c->num_ctlpoints * sizeof (*c->ctlpoint));
|
|
|
643
|
|
|
644 rx = 0.0;
|
|
|
645 dx = (width - 1) / (gfloat) (c->num_ctlpoints - 1);
|
|
|
646
|
|
|
647 for (i = 0; i < c->num_ctlpoints; ++i, rx += dx)
|
|
|
648 {
|
|
|
649 x = (int) (rx + 0.5);
|
|
|
650 c->ctlpoint[i][0] =
|
|
|
651 unproject (x, c->min_x, c->max_x, width);
|
|
|
652 c->ctlpoint[i][1] =
|
|
|
653 unproject (RADIUS + height - c->point[x].y,
|
|
|
654 c->min_y, c->max_y, height);
|
|
|
655 }
|
|
|
656 c->curve_type = new_type;
|
|
|
657 gtk_curve_interpolate (c, width, height);
|
|
|
658 }
|
|
|
659 else
|
|
|
660 {
|
|
|
661 c->curve_type = new_type;
|
|
|
662 gtk_curve_interpolate (c, width, height);
|
|
|
663 }
|
|
|
664 gtk_signal_emit (GTK_OBJECT (c), curve_type_changed_signal);
|
|
|
665 gtk_curve_draw (c, width, height);
|
|
|
666 }
|
|
|
667 }
|
|
|
668
|
|
|
669 static void
|
|
|
670 gtk_curve_size_graph (GtkCurve *curve)
|
|
|
671 {
|
|
|
672 gint width, height;
|
|
|
673 gfloat aspect;
|
|
|
674
|
|
|
675 width = (curve->max_x - curve->min_x) + 1;
|
|
|
676 height = (curve->max_y - curve->min_y) + 1;
|
|
|
677 aspect = width / (gfloat) height;
|
|
|
678 if (width > gdk_screen_width () / 4)
|
|
|
679 width = gdk_screen_width () / 4;
|
|
|
680 if (height > gdk_screen_height () / 4)
|
|
|
681 height = gdk_screen_height () / 4;
|
|
|
682
|
|
|
683 if (aspect < 1.0)
|
|
|
684 width = height * aspect;
|
|
|
685 else
|
|
|
686 height = width / aspect;
|
|
|
687
|
|
|
688 gtk_drawing_area_size (GTK_DRAWING_AREA (curve),
|
|
|
689 width + RADIUS * 2, height + RADIUS * 2);
|
|
|
690 }
|
|
|
691
|
|
|
692 static void
|
|
|
693 gtk_curve_reset_vector (GtkCurve *curve)
|
|
|
694 {
|
|
|
695 if (curve->ctlpoint)
|
|
|
696 g_free (curve->ctlpoint);
|
|
|
697
|
|
|
698 curve->num_ctlpoints = 2;
|
|
|
699 curve->ctlpoint = g_malloc (2 * sizeof (curve->ctlpoint[0]));
|
|
|
700 curve->ctlpoint[0][0] = curve->min_x;
|
|
|
701 curve->ctlpoint[0][1] = curve->min_y;
|
|
|
702 curve->ctlpoint[1][0] = curve->max_x;
|
|
|
703 curve->ctlpoint[1][1] = curve->max_y;
|
|
|
704
|
|
|
705 if (curve->pixmap)
|
|
|
706 {
|
|
|
707 gint width, height;
|
|
|
708
|
|
|
709 width = GTK_WIDGET (curve)->allocation.width - RADIUS * 2;
|
|
|
710 height = GTK_WIDGET (curve)->allocation.height - RADIUS * 2;
|
|
|
711
|
|
|
712 if (curve->curve_type == GTK_CURVE_TYPE_FREE)
|
|
|
713 {
|
|
|
714 curve->curve_type = GTK_CURVE_TYPE_LINEAR;
|
|
|
715 gtk_curve_interpolate (curve, width, height);
|
|
|
716 curve->curve_type = GTK_CURVE_TYPE_FREE;
|
|
|
717 }
|
|
|
718 else
|
|
|
719 gtk_curve_interpolate (curve, width, height);
|
|
|
720 gtk_curve_draw (curve, width, height);
|
|
|
721 }
|
|
|
722 }
|
|
|
723
|
|
|
724 void
|
|
|
725 gtk_curve_reset (GtkCurve *c)
|
|
|
726 {
|
|
|
727 GtkCurveType old_type;
|
|
|
728
|
|
|
729 old_type = c->curve_type;
|
|
|
730 c->curve_type = GTK_CURVE_TYPE_SPLINE;
|
|
|
731 gtk_curve_reset_vector (c);
|
|
|
732
|
|
|
733 if (old_type != GTK_CURVE_TYPE_SPLINE)
|
|
|
734 gtk_signal_emit (GTK_OBJECT (c), curve_type_changed_signal);
|
|
|
735 }
|
|
|
736
|
|
|
737 void
|
|
|
738 gtk_curve_set_gamma (GtkCurve *c, gfloat gamma)
|
|
|
739 {
|
|
|
740 gfloat x, one_over_gamma, height, one_over_width;
|
|
|
741 GtkCurveType old_type;
|
|
|
742 gint i;
|
|
|
743
|
|
|
744 if (c->num_points < 2)
|
|
|
745 return;
|
|
|
746
|
|
|
747 old_type = c->curve_type;
|
|
|
748 c->curve_type = GTK_CURVE_TYPE_FREE;
|
|
|
749
|
|
|
750 if (gamma <= 0)
|
|
|
751 one_over_gamma = 1.0;
|
|
|
752 else
|
|
|
753 one_over_gamma = 1.0 / gamma;
|
|
|
754 one_over_width = 1.0 / (c->num_points - 1);
|
|
|
755 height = c->height;
|
|
|
756 for (i = 0; i < c->num_points; ++i)
|
|
|
757 {
|
|
|
758 x = (gfloat) i / (c->num_points - 1);
|
|
|
759 c->point[i].x = RADIUS + i;
|
|
|
760 c->point[i].y =
|
|
|
761 RADIUS + (height * (1.0 - pow (x, one_over_gamma)) + 0.5);
|
|
|
762 }
|
|
|
763
|
|
|
764 if (old_type != GTK_CURVE_TYPE_FREE)
|
|
|
765 gtk_signal_emit (GTK_OBJECT (c), curve_type_changed_signal);
|
|
|
766
|
|
|
767 gtk_curve_draw (c, c->num_points, c->height);
|
|
|
768 }
|
|
|
769
|
|
|
770 void
|
|
|
771 gtk_curve_set_range (GtkCurve *curve,
|
|
|
772 gfloat min_x, gfloat max_x, gfloat min_y, gfloat max_y)
|
|
|
773 {
|
|
|
774 curve->min_x = min_x;
|
|
|
775 curve->max_x = max_x;
|
|
|
776 curve->min_y = min_y;
|
|
|
777 curve->max_y = max_y;
|
|
|
778
|
|
|
779 gtk_curve_size_graph (curve);
|
|
|
780 gtk_curve_reset_vector (curve);
|
|
|
781 }
|
|
|
782
|
|
|
783 void
|
|
|
784 gtk_curve_set_vector (GtkCurve *c, int veclen, gfloat vector[])
|
|
|
785 {
|
|
|
786 GtkCurveType old_type;
|
|
|
787 gfloat rx, dx, ry;
|
|
|
788 gint i, height;
|
|
|
789
|
|
|
790 old_type = c->curve_type;
|
|
|
791 c->curve_type = GTK_CURVE_TYPE_FREE;
|
|
|
792
|
|
|
793 if (c->point)
|
|
|
794 height = GTK_WIDGET (c)->allocation.height - RADIUS * 2;
|
|
|
795 else
|
|
|
796 {
|
|
|
797 height = (c->max_y - c->min_y);
|
|
|
798 if (height > gdk_screen_height () / 4)
|
|
|
799 height = gdk_screen_height () / 4;
|
|
|
800
|
|
|
801 c->height = height;
|
|
|
802 c->num_points = veclen;
|
|
|
803 c->point = g_malloc (c->num_points * sizeof (c->point[0]));
|
|
|
804 }
|
|
|
805 rx = 0;
|
|
|
806 dx = (veclen - 1.0) / (c->num_points - 1.0);
|
|
|
807
|
|
|
808 for (i = 0; i < c->num_points; ++i, rx += dx)
|
|
|
809 {
|
|
|
810 ry = vector[(int) (rx + 0.5)];
|
|
|
811 if (ry > c->max_y) ry = c->max_y;
|
|
|
812 if (ry < c->min_y) ry = c->min_y;
|
|
|
813 c->point[i].x = RADIUS + i;
|
|
|
814 c->point[i].y =
|
|
|
815 RADIUS + height - project (ry, c->min_y, c->max_y, height);
|
|
|
816 }
|
|
|
817 if (old_type != GTK_CURVE_TYPE_FREE)
|
|
|
818 gtk_signal_emit (GTK_OBJECT (c), curve_type_changed_signal);
|
|
|
819
|
|
|
820 gtk_curve_draw (c, c->num_points, height);
|
|
|
821 }
|
|
|
822
|
|
|
823 void
|
|
|
824 gtk_curve_get_vector (GtkCurve *c, int veclen, gfloat vector[])
|
|
|
825 {
|
|
|
826 gfloat rx, ry, dx, dy, min_x, delta_x, *mem, *xv, *yv, *y2v, prev;
|
|
|
827 gint dst, i, x, next, num_active_ctlpoints = 0, first_active = -1;
|
|
|
828
|
|
|
829 min_x = c->min_x;
|
|
|
830
|
|
|
831 if (c->curve_type != GTK_CURVE_TYPE_FREE)
|
|
|
832 {
|
|
|
833 /* count active points: */
|
|
|
834 prev = min_x - 1.0;
|
|
|
835 for (i = num_active_ctlpoints = 0; i < c->num_ctlpoints; ++i)
|
|
|
836 if (c->ctlpoint[i][0] > prev)
|
|
|
837 {
|
|
|
838 if (first_active < 0)
|
|
|
839 first_active = i;
|
|
|
840 prev = c->ctlpoint[i][0];
|
|
|
841 ++num_active_ctlpoints;
|
|
|
842 }
|
|
|
843
|
|
|
844 /* handle degenerate case: */
|
|
|
845 if (num_active_ctlpoints < 2)
|
|
|
846 {
|
|
|
847 if (num_active_ctlpoints > 0)
|
|
|
848 ry = c->ctlpoint[first_active][1];
|
|
|
849 else
|
|
|
850 ry = c->min_y;
|
|
|
851 if (ry < c->min_y) ry = c->min_y;
|
|
|
852 if (ry > c->max_y) ry = c->max_y;
|
|
|
853 for (x = 0; x < veclen; ++x)
|
|
|
854 vector[x] = ry;
|
|
|
855 return;
|
|
|
856 }
|
|
|
857 }
|
|
|
858
|
|
|
859 switch (c->curve_type)
|
|
|
860 {
|
|
|
861 case GTK_CURVE_TYPE_SPLINE:
|
|
|
862 mem = g_malloc (3 * num_active_ctlpoints * sizeof (gfloat));
|
|
|
863 xv = mem;
|
|
|
864 yv = mem + num_active_ctlpoints;
|
|
|
865 y2v = mem + 2*num_active_ctlpoints;
|
|
|
866
|
|
|
867 prev = min_x - 1.0;
|
|
|
868 for (i = dst = 0; i < c->num_ctlpoints; ++i)
|
|
|
869 if (c->ctlpoint[i][0] > prev)
|
|
|
870 {
|
|
|
871 prev = c->ctlpoint[i][0];
|
|
|
872 xv[dst] = c->ctlpoint[i][0];
|
|
|
873 yv[dst] = c->ctlpoint[i][1];
|
|
|
874 ++dst;
|
|
|
875 }
|
|
|
876
|
|
|
877 spline_solve (num_active_ctlpoints, xv, yv, y2v);
|
|
|
878
|
|
|
879 rx = min_x;
|
|
|
880 dx = (c->max_x - min_x) / (veclen - 1);
|
|
|
881 for (x = 0; x < veclen; ++x, rx += dx)
|
|
|
882 {
|
|
|
883 ry = spline_eval (num_active_ctlpoints, xv, yv, y2v, rx);
|
|
|
884 if (ry < c->min_y) ry = c->min_y;
|
|
|
885 if (ry > c->max_y) ry = c->max_y;
|
|
|
886 vector[x] = ry;
|
|
|
887 }
|
|
|
888
|
|
|
889 g_free (mem);
|
|
|
890 break;
|
|
|
891
|
|
|
892 case GTK_CURVE_TYPE_LINEAR:
|
|
|
893 dx = (c->max_x - min_x) / (veclen - 1);
|
|
|
894 rx = min_x;
|
|
|
895 ry = c->min_y;
|
|
|
896 dy = 0.0;
|
|
|
897 i = first_active;
|
|
|
898 for (x = 0; x < veclen; ++x, rx += dx)
|
|
|
899 {
|
|
|
900 if (rx >= c->ctlpoint[i][0])
|
|
|
901 {
|
|
|
902 if (rx > c->ctlpoint[i][0])
|
|
|
903 ry = c->min_y;
|
|
|
904 dy = 0.0;
|
|
|
905 next = i + 1;
|
|
|
906 while (next < c->num_ctlpoints
|
|
|
907 && c->ctlpoint[next][0] <= c->ctlpoint[i][0])
|
|
|
908 ++next;
|
|
|
909 if (next < c->num_ctlpoints)
|
|
|
910 {
|
|
|
911 delta_x = c->ctlpoint[next][0] - c->ctlpoint[i][0];
|
|
|
912 dy = ((c->ctlpoint[next][1] - c->ctlpoint[i][1])
|
|
|
913 / delta_x);
|
|
|
914 dy *= dx;
|
|
|
915 ry = c->ctlpoint[i][1];
|
|
|
916 i = next;
|
|
|
917 }
|
|
|
918 }
|
|
|
919 vector[x] = ry;
|
|
|
920 ry += dy;
|
|
|
921 }
|
|
|
922 break;
|
|
|
923
|
|
|
924 case GTK_CURVE_TYPE_FREE:
|
|
|
925 if (c->point)
|
|
|
926 {
|
|
|
927 rx = 0.0;
|
|
|
928 dx = c->num_points / (double) veclen;
|
|
|
929 for (x = 0; x < veclen; ++x, rx += dx)
|
|
|
930 vector[x] = unproject (RADIUS + c->height - c->point[(int) rx].y,
|
|
|
931 c->min_y, c->max_y,
|
|
|
932 c->height);
|
|
|
933 }
|
|
|
934 else
|
|
|
935 memset (vector, 0, veclen * sizeof (vector[0]));
|
|
|
936 break;
|
|
|
937 }
|
|
|
938 }
|
|
|
939
|
|
|
940 GtkWidget*
|
|
|
941 gtk_curve_new (void)
|
|
|
942 {
|
|
|
943 return gtk_type_new (gtk_curve_get_type ());
|
|
|
944 }
|
|
|
945
|
|
|
946 static void
|
|
|
947 gtk_curve_finalize (GtkObject *object)
|
|
|
948 {
|
|
|
949 GtkCurve *curve;
|
|
|
950
|
|
|
951 g_return_if_fail (object != NULL);
|
|
|
952 g_return_if_fail (GTK_IS_CURVE (object));
|
|
|
953
|
|
|
954 curve = GTK_CURVE (object);
|
|
|
955 if (curve->pixmap)
|
|
|
956 gdk_pixmap_unref (curve->pixmap);
|
|
|
957 if (curve->point)
|
|
|
958 g_free (curve->point);
|
|
|
959 if (curve->ctlpoint)
|
|
|
960 g_free (curve->ctlpoint);
|
|
|
961
|
|
|
962 (*GTK_OBJECT_CLASS (parent_class)->finalize) (object);
|
|
|
963 }
|
