1 | // =============================================================== // |
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2 | // // |
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3 | // File : SEC_split.cxx // |
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4 | // Purpose : split/unsplit loops (aka fold/unfold helices) // |
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5 | // // |
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6 | // Coded by Ralf Westram (coder@reallysoft.de) in August 2007 // |
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7 | // Institute of Microbiology (Technical University Munich) // |
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8 | // http://www.arb-home.de/ // |
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9 | // // |
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10 | // =============================================================== // |
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11 | |
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12 | #include "SEC_root.hxx" |
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13 | #include "SEC_drawn_pos.hxx" |
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14 | #include "SEC_iter.hxx" |
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15 | #include <arb_msg.h> |
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16 | |
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17 | using namespace std; |
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18 | |
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19 | enum AngleBufferMode { |
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20 | BUFFER_ABSOLUTE_ANGLES, |
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21 | BUFFER_CENTER_RELATIVE, |
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22 | }; |
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23 | |
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24 | class AngleBuffer { // stores the absolute values of some SEC_oriented |
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25 | typedef std::map<SEC_helix*, Angle> AngleMap; |
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26 | |
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27 | AngleMap angles; |
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28 | AngleBufferMode mode; |
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29 | |
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30 | Angle loop2helix(SEC_loop *loop, SEC_helix *helix) { |
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31 | return Angle(loop->get_center(), helix->strandAwayFrom(loop)->get_fixpoint()); |
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32 | } |
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33 | |
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34 | public: |
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35 | AngleBuffer(AngleBufferMode Mode) : mode(Mode) {} |
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36 | |
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37 | void store(SEC_helix *helix, SEC_loop *loop) { |
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38 | switch (mode) { |
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39 | case BUFFER_ABSOLUTE_ANGLES: |
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40 | angles[helix] = helix->get_abs_angle(); |
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41 | break; |
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42 | case BUFFER_CENTER_RELATIVE: |
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43 | angles[helix] = helix->get_abs_angle()-loop2helix(loop, helix); |
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44 | break; |
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45 | } |
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46 | } |
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47 | |
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48 | void set_angle(SEC_helix *helix, const Angle& angle) { angles[helix] = angle; } |
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49 | |
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50 | void restore(SEC_helix *helix, SEC_loop *loop) { |
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51 | switch (mode) { |
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52 | case BUFFER_ABSOLUTE_ANGLES: |
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53 | helix->set_abs_angle(angles[helix]); |
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54 | break; |
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55 | case BUFFER_CENTER_RELATIVE: |
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56 | if (helix->hasLoop(loop)) { |
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57 | helix->set_abs_angle(angles[helix]+loop2helix(loop, helix)); |
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58 | } |
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59 | break; |
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60 | } |
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61 | } |
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62 | |
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63 | void restoreAll(SEC_loop *loop) { |
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64 | AngleMap::iterator e = angles.end(); |
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65 | for (AngleMap::iterator a = angles.begin(); a != e; ++a) { |
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66 | restore(a->first, loop); |
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67 | } |
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68 | } |
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69 | |
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70 | void remove(SEC_helix *helix) { angles.erase(helix); } |
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71 | |
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72 | void storeAllHelices(SEC_loop *loop, SEC_helix *skip) { |
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73 | for (SEC_strand_iterator strand(loop); strand; ++strand) { |
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74 | SEC_helix *helix = strand->get_helix(); |
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75 | if (helix != skip) store(helix, loop); |
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76 | } |
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77 | } |
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78 | }; |
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79 | |
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80 | |
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81 | // --------------------- |
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82 | // moving root |
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83 | |
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84 | void SEC_loop::toggle_root(SEC_loop *old_root) { |
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85 | // make this the new root loop |
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86 | sec_assert(old_root != this); |
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87 | SEC_helix *mid_helix = get_rootside_helix(); |
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88 | |
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89 | // set root to loop behind mid_helix |
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90 | { |
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91 | SEC_loop *behind = mid_helix->rootsideLoop(); |
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92 | if (behind != old_root) { |
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93 | behind->toggle_root(old_root); |
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94 | old_root = behind; |
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95 | } |
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96 | } |
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97 | |
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98 | // store abs angles of all strands |
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99 | Angle midAngle = mid_helix->get_abs_angle(); |
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100 | |
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101 | AngleBuffer thisOldAbs(BUFFER_ABSOLUTE_ANGLES); |
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102 | AngleBuffer otherOldAbs(BUFFER_ABSOLUTE_ANGLES); |
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103 | |
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104 | thisOldAbs.storeAllHelices(this, mid_helix); |
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105 | otherOldAbs.storeAllHelices(old_root, mid_helix); |
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106 | |
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107 | // modify structure |
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108 | get_root()->set_root_loop(this); |
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109 | mid_helix->flip(); |
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110 | set_fixpoint_strand(mid_helix->strandAwayFrom(this)); |
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111 | old_root->set_fixpoint_strand(mid_helix->strandAwayFrom(old_root)); |
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112 | |
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113 | // calculate abs angles of loops and mid_helix |
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114 | set_rel_angle(Angle(center, get_fixpoint())); |
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115 | mark_angle_absolute(); // root-loop: rel == abs |
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116 | mid_helix->set_abs_angle(midAngle.rotate180deg()); |
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117 | old_root->set_abs_angle(Angle(old_root->get_fixpoint(), old_root->get_center())); |
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118 | |
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119 | // restore angles of other helices |
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120 | thisOldAbs.restoreAll(this); |
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121 | otherOldAbs.restoreAll(old_root); |
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122 | } |
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123 | |
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124 | void SEC_root::set_root(SEC_loop *loop) { |
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125 | SEC_loop *old_root = get_root_loop(); |
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126 | if (loop != old_root) { |
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127 | Vector new2old(loop->get_center(), old_root->get_center()); |
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128 | add_autoscroll(new2old); |
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129 | loop->toggle_root(old_root); |
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130 | recalc(); |
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131 | } |
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132 | } |
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133 | |
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134 | |
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135 | // ---------------------------------- |
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136 | // search segment by abspos |
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137 | |
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138 | SEC_base_part *SEC_root::find(int pos) { |
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139 | SEC_helix_strand *start_strand = root_loop->get_fixpoint_strand(); |
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140 | SEC_helix_strand *strand = start_strand; |
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141 | do { |
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142 | SEC_region *reg = strand->get_region(); |
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143 | if (reg->contains_seq_position(pos)) return strand; |
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144 | |
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145 | SEC_helix_strand *other_strand = strand->get_other_strand(); |
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146 | SEC_region *oreg = other_strand->get_region(); |
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147 | |
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148 | SEC_segment *seg; |
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149 | if (SEC_region(reg->get_sequence_end(), oreg->get_sequence_start()).contains_seq_position(pos)) { |
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150 | seg = other_strand->get_next_segment(); |
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151 | } |
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152 | else { |
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153 | if (oreg->contains_seq_position(pos)) return other_strand; |
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154 | seg = strand->get_next_segment(); |
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155 | } |
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156 | |
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157 | if (seg->get_region()->contains_seq_position(pos)) return seg; |
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158 | strand = seg->get_next_strand(); |
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159 | } |
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160 | while (strand != start_strand); |
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161 | |
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162 | return NULp; |
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163 | } |
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164 | |
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165 | inline SEC_segment *findSegmentContaining(SEC_root *root, int pos, GB_ERROR& error) { |
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166 | SEC_segment *result = NULp; |
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167 | error = NULp; |
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168 | |
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169 | SEC_base_part *found = root->find(pos); |
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170 | if (found) { |
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171 | if (found->parent()->getType() == SEC_LOOP) { |
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172 | result = static_cast<SEC_segment*>(found); |
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173 | } |
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174 | else { |
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175 | error = GBS_global_string("Position %i not in a segment", pos); |
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176 | } |
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177 | } |
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178 | else { |
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179 | error = GBS_global_string("Position %i is outside allowed range", pos); |
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180 | } |
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181 | return result; |
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182 | } |
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183 | |
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184 | inline SEC_segment *findSegmentContaining(SEC_root *root, int start, int end, GB_ERROR& error) { |
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185 | // end is position behind questionable position |
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186 | error = NULp; |
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187 | |
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188 | SEC_segment *start_segment = findSegmentContaining(root, start, error); |
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189 | if (start_segment) { |
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190 | SEC_segment *end_segment; |
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191 | if (end == start+1) { |
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192 | end_segment = start_segment; |
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193 | } |
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194 | else { |
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195 | end_segment = findSegmentContaining(root, end-1, error); |
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196 | } |
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197 | |
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198 | if (end_segment) { |
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199 | if (end_segment != start_segment) { |
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200 | error = GBS_global_string("Positions %i and %i are in different segments", start, end); |
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201 | start_segment = NULp; |
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202 | } |
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203 | } |
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204 | } |
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205 | sec_assert(contradicted(start_segment, error)); |
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206 | return start_segment; |
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207 | } |
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208 | |
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209 | // -------------------- |
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210 | // split loop |
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211 | |
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212 | GB_ERROR SEC_root::split_loop(int start1, int end1, int start2, int end2) { |
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213 | // end1/end2 are positions behind the helix-positions! |
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214 | sec_assert(start1<end1); |
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215 | sec_assert(start2<end2); |
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216 | |
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217 | if (start1>start2) { |
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218 | return split_loop(start2, end2, start1, end1); |
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219 | } |
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220 | |
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221 | GB_ERROR error = NULp; |
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222 | if (start2<end1) { |
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223 | error = GBS_global_string("Helices overlap (%i-%i and %i-%i)", start1, end1, start2, end2); |
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224 | } |
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225 | |
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226 | if (!error) { |
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227 | SEC_segment *seg1 = findSegmentContaining(this, start1, end1, error); |
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228 | SEC_segment *seg2 = NULp; |
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229 | |
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230 | if (!error) seg2 = findSegmentContaining(this, start2, end2, error); |
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231 | |
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232 | if (!error) { |
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233 | sec_assert(seg1 && seg2); |
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234 | SEC_loop *old_loop = seg1->get_loop(); |
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235 | if (old_loop != seg2->get_loop()) { |
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236 | error = "Positions are in different loops (no tertiary structures possible)"; |
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237 | } |
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238 | else { |
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239 | SEC_loop *setRootTo = NULp; // set root back afterwards? |
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240 | |
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241 | if (old_loop->is_root_loop()) { |
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242 | set_root(seg1->get_next_strand()->get_destination_loop()); // another loop |
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243 | setRootTo = old_loop; |
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244 | } |
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245 | |
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246 | AngleBuffer oldAngles(BUFFER_CENTER_RELATIVE); |
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247 | oldAngles.storeAllHelices(old_loop, NULp); |
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248 | |
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249 | SEC_helix *new_helix = NULp; |
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250 | SEC_loop *new_loop = NULp; |
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251 | |
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252 | if (seg1 == seg2) { // split one segment |
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253 | // \ . |
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254 | // \ seg1 >>> . |
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255 | // seg1 \ strand1 .... |
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256 | // ______________ => \_________________. . seg2 |
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257 | // _________________. . |
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258 | // / .... |
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259 | // / strand2 |
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260 | // / seg3 <<< |
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261 | // / |
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262 | // |
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263 | // seg1 is the old segment |
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264 | |
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265 | SEC_helix_strand *strand1 = seg1->split(start1, end1, &seg2); |
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266 | SEC_helix_strand *strand2 = NULp; |
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267 | SEC_segment *seg3 = NULp; |
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268 | |
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269 | if (seg1->get_region()->contains_seq_position(start2)) { |
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270 | seg3 = seg2; |
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271 | strand2 = strand1; |
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272 | strand1 = seg1->split(start2, end2, &seg2); |
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273 | } |
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274 | else { |
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275 | sec_assert(seg2->get_region()->contains_seq_position(start2)); |
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276 | strand2 = seg2->split(start2, end2, &seg3); |
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277 | } |
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278 | |
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279 | sec_assert(are_adjacent_regions(seg1->get_region(), strand1->get_region())); |
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280 | sec_assert(are_adjacent_regions(strand1->get_region(), seg2->get_region())); |
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281 | sec_assert(are_adjacent_regions(seg2->get_region(), strand2->get_region())); |
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282 | sec_assert(are_adjacent_regions(strand2->get_region(), seg3->get_region())); |
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283 | |
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284 | new_helix = new SEC_helix(this, strand2, strand1); // strands are responsible for memory |
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285 | |
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286 | strand1->set_next_segment(seg3); |
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287 | strand2->set_next_segment(seg2); |
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288 | |
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289 | new_loop = new SEC_loop(this); |
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290 | |
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291 | seg2->set_loop(new_loop); |
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292 | |
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293 | strand2->set_origin_loop(new_loop); |
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294 | new_loop->set_fixpoint_strand(strand2); |
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295 | } |
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296 | else { // split two segments |
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297 | // \ / |
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298 | // seg1 \ seg1 >>> / |
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299 | // ______________ \ strand1 / seg3 |
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300 | // \_________________/ |
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301 | // => old_loop _________________ new_loop |
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302 | // ______________ / \ . |
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303 | // seg2 / strand2 \ seg2 |
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304 | // / seg4 <<< \ . |
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305 | // / \ . |
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306 | // |
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307 | // seg1 and seg2 are the old segments |
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308 | |
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309 | // maybe swap seg1/seg2 (to ensure fixpoint-strand stays in old loop) |
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310 | for (SEC_segment *s = seg1; s != seg2;) { |
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311 | SEC_helix_strand *hs = s->get_next_strand(); |
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312 | if (!hs->isRootsideFixpoint()) { // fixpoint-strand is between seg1 -> seg2 |
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313 | // swap seg1<->seg2 |
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314 | swap(seg1, seg2); |
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315 | swap(start1, start2); |
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316 | swap(end1, end2); |
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317 | break; |
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318 | } |
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319 | s = hs->get_next_segment(); |
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320 | } |
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321 | |
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322 | SEC_segment *seg3; |
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323 | SEC_segment *seg4; |
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324 | SEC_helix_strand *strand1 = seg1->split(start1, end1, &seg3); |
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325 | SEC_helix_strand *strand2 = seg2->split(start2, end2, &seg4); |
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326 | |
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327 | new_helix = new SEC_helix(this, strand2, strand1); |
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328 | |
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329 | strand1->set_next_segment(seg4); |
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330 | strand2->set_next_segment(seg3); |
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331 | |
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332 | new_loop = new SEC_loop(this); |
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333 | |
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334 | for (SEC_segment *s = seg3; ;) { |
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335 | s->set_loop(new_loop); |
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336 | SEC_helix_strand *h = s->get_next_strand(); |
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337 | h->set_origin_loop(new_loop); |
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338 | if (s == seg2) break; |
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339 | s = h->get_next_segment(); |
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340 | } |
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341 | |
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342 | new_loop->set_fixpoint_strand(strand2); |
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343 | } |
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344 | |
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345 | // set angles of new helix and new loop |
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346 | new_helix->set_rel_angle(0); // wrong, but relayout fails otherwise |
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347 | new_loop->set_rel_angle(0); |
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348 | |
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349 | relayout(); |
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350 | |
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351 | // correct angles of other helices |
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352 | oldAngles.restoreAll(new_loop); |
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353 | oldAngles.set_angle(new_helix, Angle(0)); |
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354 | oldAngles.restoreAll(old_loop); |
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355 | |
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356 | recalc(); |
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357 | |
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358 | if (setRootTo) { |
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359 | set_root(setRootTo); // restore root loop |
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360 | } |
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361 | } |
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362 | } |
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363 | } |
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364 | return error; |
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365 | } |
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366 | |
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367 | // ----------------------- |
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368 | // fold a strand |
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369 | |
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370 | GB_ERROR SEC_root::unsplit_loop(SEC_helix_strand *remove_strand) { |
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371 | // |
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372 | // \ before[0] / after[1] |
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373 | // \ / |
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374 | // \ >>>> / |
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375 | // \ strand[0] / |
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376 | // \_________________/ |
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377 | // loop[0] _________________ loop[1] |
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378 | // / strand[1] \ . |
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379 | // / <<<< \ . |
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380 | // / \ . |
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381 | // / \ . |
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382 | // / after[0] \ before[1] |
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383 | // |
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384 | // The strands are removed and segments get connected. |
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385 | // One loop is deleted. |
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386 | |
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387 | GB_ERROR error = NULp; |
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388 | SEC_helix_strand *strand[2] = { remove_strand, remove_strand->get_other_strand() }; |
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389 | SEC_segment *before[2], *after[2]; |
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390 | SEC_loop *loop[2]; |
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391 | |
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392 | #if defined(CHECK_INTEGRITY) |
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393 | check_integrity(CHECK_STRUCTURE); |
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394 | #endif // CHECK_INTEGRITY |
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395 | |
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396 | int s; |
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397 | for (s = 0; s<2; s++) { |
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398 | after[s] = strand[s]->get_next_segment(); |
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399 | before[s] = strand[s]->get_previous_segment(); |
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400 | loop[s] = strand[s]->get_origin_loop(); |
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401 | |
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402 | sec_assert(before[s]->get_loop() == loop[s]); |
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403 | sec_assert(after[s]->get_loop() == loop[s]); |
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404 | } |
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405 | |
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406 | bool is_terminal_loop[2] = { before[0] == after[0], before[1] == after[1] }; |
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407 | int i0 = -1; // index of terminal loop (or -1) |
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408 | bool unsplit = true; |
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409 | |
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410 | if (is_terminal_loop[0]) { |
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411 | if (is_terminal_loop[1]) { |
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412 | error = "You cannot delete the last helix"; |
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413 | unsplit = false; |
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414 | } |
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415 | else i0 = 0; |
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416 | } |
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417 | else { |
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418 | if (is_terminal_loop[1]) i0 = 1; |
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419 | } |
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420 | |
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421 | if (unsplit) { |
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422 | int del = i0 >= 0 ? i0 : 1; // index of loop which will be deleted |
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423 | |
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424 | SEC_loop *setRootTo = NULp; // set root back to afterwards? |
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425 | |
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426 | { |
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427 | // move away root-loop to make things easy |
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428 | SEC_loop *rootLoop = get_root_loop(); |
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429 | if (loop[0] == rootLoop || loop[1] == rootLoop) { |
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430 | SEC_loop *termLoop = is_terminal_loop[0] ? loop[0] : loop[1]; |
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431 | SEC_helix_strand *toTerm = strand[0]->get_helix()->strandTowards(termLoop); |
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432 | SEC_helix_strand *toNextLoop = toTerm->get_next_segment()->get_next_strand(); |
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433 | SEC_loop *anotherLoop = toNextLoop->get_destination_loop(); |
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434 | |
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435 | sec_assert(anotherLoop != loop[0] && anotherLoop != loop[1]); |
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436 | |
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437 | set_root(anotherLoop); |
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438 | setRootTo = loop[1-del]; // afterwards set root back to non-deleted loop |
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439 | } |
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440 | } |
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441 | |
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442 | SEC_helix *removed_helix = strand[0]->get_helix(); |
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443 | AngleBuffer oldAngles(BUFFER_CENTER_RELATIVE); |
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444 | oldAngles.storeAllHelices(loop[0], removed_helix); |
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445 | oldAngles.storeAllHelices(loop[1], removed_helix); |
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446 | |
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447 | if (i0 >= 0) { // one loop is terminal |
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448 | // i0 and i1 are indexes 0 and 1 in picture above. |
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449 | // The left loop (loop[i0]) will be removed. |
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450 | int i1 = 1-i0; // index of non-terminal loop |
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451 | |
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452 | before[i1]->mergeWith(after[i1], loop[i1]); |
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453 | |
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454 | sec_assert(after[i0] == before[i0]); |
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455 | delete after[i0]; // delete the segment of the terminal-loop |
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456 | } |
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457 | else { // none of the loops is terminal |
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458 | // keep loop[0], delete loop[1] |
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459 | |
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460 | SEC_helix_strand *rootsideStrand = strand[0]->get_helix()->rootsideLoop()->get_rootside_strand(); |
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461 | |
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462 | before[1]->mergeWith(after[0], loop[0]); |
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463 | before[0]->mergeWith(after[1], loop[0]); |
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464 | // after[] segments are invalid now! |
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465 | |
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466 | // loop over all segments in loop[1] and relink them to loop[0] |
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467 | SEC_segment *seg = before[0]; |
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468 | while (seg != before[1]) { |
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469 | SEC_helix_strand *loop1_strand = seg->get_next_strand(); |
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470 | loop1_strand->set_origin_loop(loop[0]); |
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471 | |
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472 | seg = loop1_strand->get_next_segment(); |
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473 | seg->set_loop(loop[0]); |
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474 | } |
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475 | |
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476 | loop[0]->set_fixpoint_strand(rootsideStrand); |
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477 | } |
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478 | |
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479 | loop[del]->set_fixpoint_strand(NULp); |
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480 | delete loop[del]; |
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481 | |
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482 | for (s = 0; s<2; s++) strand[s]->unlink(false); |
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483 | delete strand[0]; // delete both strands |
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484 | |
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485 | relayout(); |
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486 | |
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487 | oldAngles.restoreAll(loop[1-del]); |
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488 | recalc(); |
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489 | |
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490 | if (setRootTo) set_root(setRootTo); |
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491 | } |
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492 | |
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493 | return error; |
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494 | } |
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