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Improved kart rotation to target algorithm (fixing a FIXME)

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git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/branches/irrlicht@4202 178a84e3-b1eb-0310-8ba1-8eac791a3b58
This commit is contained in:
auria 2009-11-03 20:23:32 +00:00
parent bed61da8a6
commit 89b3c5162c
1 changed files with 20 additions and 2 deletions
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22
src/guiengine/widgets/model_view_widget.cpp
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@ -103,8 +103,26 @@ void ModelViewWidget::update(float delta)
}
else if (m_rotation_mode == ROTATE_TO)
{
// TODO : doesn't handle warp-arounds, which may be faster (e.g. we're at 300 and target is 10, better use warp-around)
if (angle < m_rotation_target)
// check if we should rotate clockwise or counter-clockwise to reach the target faster
// (taking warp-arounds into account)
const int angle_distance_from_end = 360 - angle;
const int target_distance_from_end = 360 - angle;
int distance_with_positive_rotation;
int distance_with_negative_rotation;
if (angle < m_rotation_target)
{
distance_with_positive_rotation = m_rotation_target - angle;
distance_with_negative_rotation = angle + target_distance_from_end;
}
else
{
distance_with_positive_rotation = angle_distance_from_end + m_rotation_target;
distance_with_negative_rotation = angle - m_rotation_target;
}
if (distance_with_positive_rotation < distance_with_negative_rotation)
{
angle += delta*m_rotation_speed;
}