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   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file valuenode_timedswap.cpp
   3 **      \brief Implementation of the "Timed Swap" valuenode conversion.
   4 **
   5 **      $Id$
   6 **
   7 **      \legal
   8 **      Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
   9 **      Copyright (c) 2007, 2008 Chris Moore
  10 **
  11 **      This package is free software; you can redistribute it and/or
  12 **      modify it under the terms of the GNU General Public License as
  13 **      published by the Free Software Foundation; either version 2 of
  14 **      the License, or (at your option) any later version.
  15 **
  16 **      This package is distributed in the hope that it will be useful,
  17 **      but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 **      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19 **      General Public License for more details.
  20 **      \endlegal
  21 */
  22 /* ========================================================================= */
  23
  24 /* === H E A D E R S ======================================================= */
  25
  26 #ifdef USING_PCH
  27 #       include "pch.h"
  28 #else
  29 #ifdef HAVE_CONFIG_H
  30 #       include <config.h>
  31 #endif
  32
  33 #include "general.h"
  34 #include "valuenode_timedswap.h"
  35 #include "valuenode_const.h"
  36 #include <stdexcept>
  37 #include "color.h"
  38 #include <ETL/misc>
  39
  40 #endif
  41
  42 /* === U S I N G =========================================================== */
  43
  44 using namespace std;
  45 using namespace etl;
  46 using namespace synfig;
  47
  48 /* === M A C R O S ========================================================= */
  49
  50 /* === G L O B A L S ======================================================= */
  51
  52 /* === P R O C E D U R E S ================================================= */
  53
  54 /* === M E T H O D S ======================================================= */
  55
  56 ValueNode_TimedSwap::ValueNode_TimedSwap(const ValueBase &value):
  57         LinkableValueNode(value.get_type())
  58 {
  59         switch(get_type())
  60         {
  61         case ValueBase::TYPE_ANGLE:
  62                 set_link("before",ValueNode_Const::create(value.get(Angle())));
  63                 set_link("after",ValueNode_Const::create(value.get(Angle())));
  64                 break;
  65         case ValueBase::TYPE_COLOR:
  66                 set_link("before",ValueNode_Const::create(value.get(Color())));
  67                 set_link("after",ValueNode_Const::create(value.get(Color())));
  68                 break;
  69         case ValueBase::TYPE_INTEGER:
  70                 set_link("before",ValueNode_Const::create(value.get(int())));
  71                 set_link("after",ValueNode_Const::create(value.get(int())));
  72                 break;
  73         case ValueBase::TYPE_REAL:
  74                 set_link("before",ValueNode_Const::create(value.get(Real())));
  75                 set_link("after",ValueNode_Const::create(value.get(Real())));
  76                 break;
  77         case ValueBase::TYPE_TIME:
  78                 set_link("before",ValueNode_Const::create(value.get(Time())));
  79                 set_link("after",ValueNode_Const::create(value.get(Time())));
  80                 break;
  81         case ValueBase::TYPE_VECTOR:
  82                 set_link("before",ValueNode_Const::create(value.get(Vector())));
  83                 set_link("after",ValueNode_Const::create(value.get(Vector())));
  84                 break;
  85         default:
  86                 throw Exception::BadType(ValueBase::type_local_name(get_type()));
  87         }
  88
  89         set_link("time",ValueNode_Const::create(Time(2)));
  90         set_link("length",ValueNode_Const::create(Time(1)));
  91
  92         DCAST_HACK_ENABLE();
  93 }
  94
  95 ValueNode_TimedSwap*
  96 ValueNode_TimedSwap::create(const ValueBase& x)
  97 {
  98         return new ValueNode_TimedSwap(x);
  99 }
 100
 101 LinkableValueNode*
 102 ValueNode_TimedSwap::create_new()const
 103 {
 104         return new ValueNode_TimedSwap(get_type());
 105 }
 106
 107 synfig::ValueNode_TimedSwap::~ValueNode_TimedSwap()
 108 {
 109         unlink_all();
 110 }
 111
 112 synfig::ValueBase
 113 synfig::ValueNode_TimedSwap::operator()(Time t)const
 114 {
 115         Time swptime=(*swap_time)(t).get(Time());
 116         Time swplength=(*swap_length)(t).get(Time());
 117
 118         if(t>swptime)
 119                 return (*after)(t);
 120
 121         if(t<=swptime && t>swptime-swplength)
 122         {
 123                 Real amount=(swptime-t)/swplength;
 124                 // if amount==0.0, then we are after
 125                 // if amount==1.0, then we are before
 126
 127                 switch(get_type())
 128                 {
 129                 case ValueBase::TYPE_ANGLE:
 130                         {
 131                                 Angle a=(*after)(t).get(Angle());
 132                                 Angle b=(*before)(t).get(Angle());
 133                                 return (b-a)*amount+a;
 134                         }
 135                 case ValueBase::TYPE_COLOR:
 136                         {
 137                                 Color a=(*after)(t).get(Color());
 138                                 Color b=(*before)(t).get(Color());
 139                                 // note: Shouldn't this use a straight blend?
 140                                 return (b-a)*amount+a;
 141                         }
 142                 case ValueBase::TYPE_INTEGER:
 143                         {
 144                                 float a=(float)(*after)(t).get(int());
 145                                 float b=(float)(*before)(t).get(int());
 146                                 return round_to_int((b-a)*amount+a);
 147                         }
 148                 case ValueBase::TYPE_REAL:
 149                         {
 150                                 Real a=(*after)(t).get(Real());
 151                                 Real b=(*before)(t).get(Real());
 152                                 return (b-a)*amount+a;
 153                         }
 154                 case ValueBase::TYPE_TIME:
 155                         {
 156                                 Time a=(*after)(t).get(Time());
 157                                 Time b=(*before)(t).get(Time());
 158                                 return (b-a)*amount+a;
 159                         }
 160                 case ValueBase::TYPE_VECTOR:
 161                         {
 162                                 Vector a=(*after)(t).get(Vector());
 163                                 Vector b=(*before)(t).get(Vector());
 164                                 return (b-a)*amount+a;
 165                         }
 166                 default:
 167                         break;
 168                 }
 169         }
 170
 171         /*! \todo this should interpolate from
 172         **      before to after over the period defined
 173         **      by swap_length */
 174
 175         return (*before)(t);
 176 }
 177
 178 bool
 179 ValueNode_TimedSwap::set_link_vfunc(int i,ValueNode::Handle value)
 180 {
 181         assert(i>=0 && i<link_count());
 182
 183         switch(i)
 184         {
 185         case 0: CHECK_TYPE_AND_SET_VALUE(before,      get_type());
 186         case 1: CHECK_TYPE_AND_SET_VALUE(after,       get_type());
 187         case 2: CHECK_TYPE_AND_SET_VALUE(swap_time,   ValueBase::TYPE_TIME);
 188         case 3: CHECK_TYPE_AND_SET_VALUE(swap_length, ValueBase::TYPE_TIME);
 189         }
 190         return false;
 191 }
 192
 193 ValueNode::LooseHandle
 194 ValueNode_TimedSwap::get_link_vfunc(int i)const
 195 {
 196         assert(i>=0 && i<link_count());
 197
 198         switch(i)
 199         {
 200         case 0: return before;
 201         case 1: return after;
 202         case 2: return swap_time;
 203         case 3: return swap_length;
 204         }
 205         return 0;
 206 }
 207
 208 int
 209 ValueNode_TimedSwap::link_count()const
 210 {
 211         return 4;
 212 }
 213
 214 String
 215 ValueNode_TimedSwap::link_local_name(int i)const
 216 {
 217         assert(i>=0 && i<link_count());
 218
 219         switch(i)
 220         {
 221         case 0: return _("Before");
 222         case 1: return _("After");
 223         case 2: return _("Swap Time");
 224         case 3: return _("Swap Duration");
 225         default:return String();
 226         }
 227 }
 228
 229 String
 230 ValueNode_TimedSwap::link_name(int i)const
 231 {
 232         assert(i>=0 && i<link_count());
 233
 234         switch(i)
 235         {
 236         case 0: return "before";
 237         case 1: return "after";
 238         case 2: return "time";
 239         case 3: return "length";
 240         default:return String();
 241         }
 242 }
 243
 244 int
 245 ValueNode_TimedSwap::get_link_index_from_name(const String &name)const
 246 {
 247         if(name=="before")      return 0;
 248         if(name=="after")       return 1;
 249         if(name=="time")        return 2;
 250         if(name=="length")      return 3;
 251
 252         throw Exception::BadLinkName(name);
 253 }
 254
 255 String
 256 ValueNode_TimedSwap::get_name()const
 257 {
 258         return "timed_swap";
 259 }
 260
 261 String
 262 ValueNode_TimedSwap::get_local_name()const
 263 {
 264         return _("Timed Swap");
 265 }
 266
 267 bool
 268 ValueNode_TimedSwap::check_type(ValueBase::Type type)
 269 {
 270         return
 271                 type==ValueBase::TYPE_ANGLE ||
 272                 type==ValueBase::TYPE_COLOR ||
 273                 type==ValueBase::TYPE_INTEGER ||
 274                 type==ValueBase::TYPE_REAL ||
 275                 type==ValueBase::TYPE_TIME ||
 276                 type==ValueBase::TYPE_VECTOR;
 277 }