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Fix steps collapsing after non-closed roundabouts, #4100

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This commit is contained in:
Michael Krasnyk 2017-05-31 09:39:15 +02:00
parent 5d4ab4100a
commit 858ec2e655
1 changed files with 16 additions and 5 deletions
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21
src/engine/guidance/collapse_turns.cpp
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@ -53,7 +53,7 @@ double findTotalTurnAngle(const RouteStep &entry_step, const RouteStep &exit_ste
// both angles are in the same direction, the total turn gets increased
// 
// a ---- b
// \
// \ 
// c
// |
// d
@ -315,10 +315,21 @@ RouteSteps collapseTurnInstructions(RouteSteps steps)
if (entersRoundabout(current_step->maneuver.instruction) ||
staysOnRoundabout(current_step->maneuver.instruction))
{
// Skip over all instructions within the roundabout
for (; current_step + 1 != steps.end(); ++current_step)
if (leavesRoundabout(current_step->maneuver.instruction))
break;
// Skip over all instructions within the roundabout or check for
// special case from setUpRoundabout of a single Enter{Rotary,..} instruction
auto next_exit_or_enter =
std::find_if(current_step + 1, std::prev(steps.end()), [](const auto &step) {
return leavesRoundabout(step.maneuver.instruction) ||
entersRoundabout(step.maneuver.instruction);
});
bool is_touching_or_crossing_roundabout =
!leavesRoundabout(next_exit_or_enter->maneuver.instruction) &&
current_step->maneuver.exit == 1;
// If the instruction touches or crosses the roundabout then the current instruction
// is also an exit one otherwise move the current step to the corresponding exit
current_step = is_touching_or_crossing_roundabout ? current_step : next_exit_or_enter;
// are we done for good?
if (current_step + 1 == steps.end())