4 * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 #include "floatauto.h"
27 #include "floatautos.h"
29 #include "localsession.h"
30 #include "transportque.inc"
31 #include "automation.inc"
33 FloatAuto::FloatAuto(EDL *edl, FloatAutos *autos)
34 : Auto(edl, (Autos*)autos)
38 control_out_value = 0;
39 control_in_position = 0;
40 control_out_position = 0;
41 pos_valid = -1; //"dirty"
43 // note: in most cases the curve_mode value is set
44 // by the method interpolate_from() rsp. copy_from()
47 FloatAuto::~FloatAuto()
49 // as we are going away, the neighbouring float auto nodes
50 // need to re-adjust their ctrl point positions and curves
52 ((FloatAuto*)next)->curve_dirty();
54 ((FloatAuto*)previous)->curve_dirty();
57 int FloatAuto::operator==(Auto &that)
59 return identical((FloatAuto*)&that);
63 int FloatAuto::operator==(FloatAuto &that)
65 return identical((FloatAuto*)&that);
68 int FloatAuto::identical(FloatAuto *src)
70 return EQUIV(value, src->value) &&
71 EQUIV(control_in_value, src->control_in_value) &&
72 EQUIV(control_out_value, src->control_out_value);
73 // ctrl positions ignored, as they may depend on neighbours
74 // curve_mode is ignored, no recalculations
78 int FloatAuto::equals(FloatAuto *that)
80 return this->value == that->value &&
81 this->control_in_value == that->control_in_value &&
82 this->control_out_value == that->control_out_value &&
83 this->control_in_position == that->control_in_position &&
84 this->control_out_position == that->control_out_position &&
85 this->curve_mode == that->curve_mode;
89 /* Note: the following is essentially display-code and has been moved to:
90 * TrackCanvas::value_to_percentage(float auto_value, int autogrouptype)
92 float FloatAuto::value_to_percentage()
95 float FloatAuto::value_to_percentage()
98 float FloatAuto::value_to_percentage()
104 void FloatAuto::copy_from(Auto *that)
106 copy_from((FloatAuto*)that);
109 void FloatAuto::copy_from(FloatAuto *that)
111 Auto::copy_from(that);
112 this->value = that->value;
113 this->control_in_value = that->control_in_value;
114 this->control_out_value = that->control_out_value;
115 this->control_in_position = that->control_in_position;
116 this->control_out_position = that->control_out_position;
117 this->curve_mode = that->curve_mode;
118 // note: literate copy, no recalculations
122 void FloatAuto::handle_automatic_curve_after_copy()
123 // in most cases, we don't want to use the manual curve modes
124 // of the left neighbour used as a template for interpolation.
125 // Rather, we (re)set to automatically smoothed curves. Note
126 // auto generated nodes (while tweaking values) indeed are
127 // inserted by using this "interpolation" approach, thus making
128 // this defaulting to auto-smooth curves very important.
130 if(curve_mode == FREE || curve_mode == TFREE)
132 this->curve_mode = SMOOTH;
137 int FloatAuto::interpolate_from(Auto *a1, Auto *a2, int64_t pos, Auto *templ)
138 // bézier interpolates this->value and curves for the given position
139 // between the positions of a1 and a2. If a1 or a2 are omitted, they default
140 // to this->previous and this->next. If this FloatAuto has automatic curves,
141 // this may trigger re-adjusting of this and its neighbours in this->autos.
142 // Note while a1 and a2 need not be members of this->autos, automatic
143 // readjustments are always done to the neighbours in this->autos.
144 // If the template is given, it will be used to fill out this
145 // objects fields prior to interpolating.
147 if(!a1) a1 = previous;
149 Auto::interpolate_from(a1, a2, pos, templ);
150 if( !templ ) handle_automatic_curve_after_copy();
151 if( curve_mode == SMOOTH && a1 && a2 &&
152 a1->is_floatauto() && a2->is_floatauto() &&
153 a1->position <= pos && pos <= a2->position ) {
154 // set this->value using bézier interpolation if possible
155 FloatAuto *left = (FloatAuto*)a1;
156 FloatAuto *right = (FloatAuto*)a2;
157 if( pos != position ) { // this may trigger smoothing
158 this->adjust_to_new_coordinates(pos,
159 FloatAutos::calculate_bezier(left, right, pos));
161 float new_slope = FloatAutos::calculate_bezier_derivation(left, right, pos);
162 this->set_control_in_value(new_slope * control_in_position);
163 this->set_control_out_value(new_slope * control_out_position);
164 return 1; //return true: interpolated indeed...
167 adjust_ctrl_positions(); // implies adjust_curves()
168 return 0; // unable to interpolate
172 void FloatAuto::change_curve_mode(t_mode new_mode)
174 if(new_mode == TFREE && !(control_in_position && control_out_position))
175 new_mode = FREE; // only if curves on both sides...
177 curve_mode = new_mode;
181 void FloatAuto::toggle_curve_mode()
183 switch (curve_mode) {
184 case SMOOTH: change_curve_mode(TFREE); break;
185 case LINEAR: change_curve_mode(FREE); break;
186 case TFREE : change_curve_mode(LINEAR); break;
187 case FREE : change_curve_mode(SMOOTH); break;
192 void FloatAuto::set_value(float newvalue)
194 this->value=newvalue;
195 this->adjust_curves();
196 if(previous) ((FloatAuto*)previous)->adjust_curves();
197 if(next) ((FloatAuto*)next)->adjust_curves();
200 void FloatAuto::set_control_in_value(float newvalue)
203 case TFREE: control_out_value = control_out_position*newvalue / control_in_position;
204 case FREE: control_in_value = newvalue;
205 default: return; // otherwise calculated automatically...
209 void FloatAuto::set_control_out_value(float newvalue)
212 case TFREE: control_in_value = control_in_position*newvalue / control_out_position;
213 case FREE: control_out_value=newvalue;
220 inline int sgn(float value) { return (value == 0)? 0 : (value < 0) ? -1 : 1; }
222 inline float weighted_mean(float v1, float v2, float w1, float w2){
223 if(0.000001 > fabs(w1 + w2))
226 return (w1 * v1 + w2 * v2) / (w1 + w2);
232 void FloatAuto::adjust_curves()
233 // recalculates curves if current mode
234 // implies automatic adjustment of curves
238 if(curve_mode == SMOOTH) {
239 // normally, one would use the slope of chord between the neighbours.
240 // but this could cause the curve to overshot extremal automation nodes.
241 // (e.g when setting a fade node at zero, the curve could go negative)
242 // we can interpret the slope of chord as a weighted mean value, where
243 // the length of the interval is used as weight; we just use other
244 // weights: intervall length /and/ reciprocal of slope. So, if the
245 // connection to one of the neighbours has very low slope this will
246 // dominate the calculated curve slope at this automation node.
247 // if the slope goes beyond the zero line, e.g if left connection
248 // has positive and right connection has negative slope, then
249 // we force the calculated curve to be horizontal.
250 float s, dxl, dxr, sl, sr;
251 calculate_slope((FloatAuto*) previous, this, sl, dxl);
252 calculate_slope(this, (FloatAuto*) next, sr, dxr);
254 if(0 < sgn(sl) * sgn(sr))
256 float wl = fabs(dxl) * (fabs(1.0/sl) + 1);
257 float wr = fabs(dxr) * (fabs(1.0/sr) + 1);
258 s = weighted_mean(sl, sr, wl, wr);
260 else s = 0; // fixed hoizontal curve
262 control_in_value = s * control_in_position;
263 control_out_value = s * control_out_position;
266 else if(curve_mode == LINEAR) {
270 calculate_slope(this, (FloatAuto*)previous, g, dx);
271 control_in_value = g * dx / 3;
275 calculate_slope(this, (FloatAuto*)next, g, dx);
276 control_out_value = g * dx / 3;
279 else if(curve_mode == TFREE && control_in_position && control_out_position) {
280 float gl = control_in_value / control_in_position;
281 float gr = control_out_value / control_out_position;
282 float wl = fabs(control_in_value);
283 float wr = fabs(control_out_value);
284 float g = weighted_mean(gl, gr, wl, wr);
286 control_in_value = g * control_in_position;
287 control_out_value = g * control_out_position;
291 inline void FloatAuto::calculate_slope(FloatAuto *left, FloatAuto *right, float &dvdx, float &dx)
294 if(!left || !right) return;
296 dx = right->position - left->position;
297 float dv = right->value - left->value;
298 dvdx = (dx == 0) ? 0 : dv/dx;
302 void FloatAuto::adjust_ctrl_positions(FloatAuto *prev, FloatAuto *next)
303 // recalculates location of ctrl points to be
304 // always 1/3 and 2/3 of the distance to the
305 // next neighbours. The reason is: for this special
306 // distance the bézier function yields x(t) = t, i.e.
307 // we can use the y(t) as if it was a simple function y(x).
309 // This adjustment is done only on demand and involves
310 // updating neighbours and adjust_curves() as well.
313 { // use current siblings
314 prev = (FloatAuto*)this->previous;
315 next = (FloatAuto*)this->next;
319 { set_ctrl_positions(prev, this);
320 prev->adjust_curves();
322 else // disable curve on left side
323 control_in_position = 0;
326 { set_ctrl_positions(this, next);
327 next->adjust_curves();
329 else // disable right curve
330 control_out_position = 0;
332 this->adjust_curves();
333 pos_valid = position;
339 inline void redefine_curve(int64_t &old_pos, int64_t new_pos, float &ctrl_val)
342 ctrl_val *= (float)new_pos / old_pos;
347 inline void FloatAuto::set_ctrl_positions(FloatAuto *prev, FloatAuto* next)
349 int64_t distance = next->position - prev->position;
350 redefine_curve(prev->control_out_position, +distance / 3, prev->control_out_value);
351 redefine_curve(next->control_in_position, -distance / 3, next->control_in_value);
356 void FloatAuto::adjust_to_new_coordinates(int64_t position, float value)
357 // define new position and value in one step, do necessary re-adjustments
360 this->position = position;
361 adjust_ctrl_positions();
366 int FloatAuto::value_to_str(char *string, float value)
370 sprintf(string, "+%.2f", value);
372 sprintf(string, "%.2f", value);
381 if(value < 1 && value > -1)
384 string[j] = string[0];
392 while(string[j] != 0) string[i++] = string[j++];
398 void FloatAuto::copy(int64_t start, int64_t end, FileXML *file, int default_auto)
400 file->tag.set_title("AUTO");
402 file->tag.set_property("POSITION", 0);
404 file->tag.set_property("POSITION", position - start);
405 file->tag.set_property("VALUE", value);
406 file->tag.set_property("CONTROL_IN_VALUE", control_in_value / 2.0); // compatibility, see below
407 file->tag.set_property("CONTROL_OUT_VALUE", control_out_value / 2.0);
408 file->tag.set_property("TANGENT_MODE", (int)curve_mode);
410 file->tag.set_title("/AUTO");
412 file->append_newline();
415 void FloatAuto::load(FileXML *file)
417 value = file->tag.get_property("VALUE", value);
418 control_in_value = file->tag.get_property("CONTROL_IN_VALUE", control_in_value);
419 control_out_value = file->tag.get_property("CONTROL_OUT_VALUE", control_out_value);
420 curve_mode = (t_mode)file->tag.get_property("TANGENT_MODE", (int)FREE);
422 // Compatibility to old session data format:
423 // Versions previous to the bezier auto patch (Jun 2006) applied a factor 2
424 // to the y-coordinates of ctrl points while calculating the bezier function.
425 // To retain compatibility, we now apply this factor while loading
426 control_in_value *= 2.0;
427 control_out_value *= 2.0;
429 // restore ctrl positions and adjust curves if necessary
430 adjust_ctrl_positions();
433 const char *FloatAuto::curve_name(int curve_mode)
435 switch( curve_mode ) {
436 case FloatAuto::SMOOTH: return _("Smooth");
437 case FloatAuto::LINEAR: return _("Linear");
438 case FloatAuto::TFREE: return _("Tangent");
439 case FloatAuto::FREE: return _("Disjoint");