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improved plunger : 1) gave it actual aiming 2) made it move up/down a bit to follow ground

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git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@2780 178a84e3-b1eb-0310-8ba1-8eac791a3b58
This commit is contained in:
auria 2008-12-26 19:32:52 +00:00
parent b3590f40b8
commit aaf3b8bfd8
1 changed files with 65 additions and 3 deletions
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68
src/items/plunger.cpp
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@ -37,10 +37,54 @@ Plunger::Plunger(Kart *kart) : Flyable(kart, POWERUP_PLUNGER)
PlayerKart* pk = dynamic_cast<PlayerKart*>(kart);
const bool reverse_mode = (pk != NULL && pk->getCamera()->getMode() == Camera::CM_REVERSE);
// find closest kart in front of the current one
const Kart *closest_kart=0; btVector3 direction; float kartDistSquared;
getClosestKart(&closest_kart, &kartDistSquared, &direction, kart /* search in front of this kart */);
btTransform trans = kart->getTrans();
btMatrix3x3 thisKartDirMatrix = kart->getKartHeading().getBasis();
btVector3 thisKartDirVector(thisKartDirMatrix[0][1],
thisKartDirMatrix[1][1],
thisKartDirMatrix[2][1]);
float heading=atan2(-thisKartDirVector.getX(), thisKartDirVector.getY());
float pitch = kart->getTerrainPitch(heading);
// aim at this kart if it's not too far
if(closest_kart != NULL && kartDistSquared < 30*30 && !reverse_mode) // aiming doesn't work backwards
{
const float time = sqrt(kartDistSquared) / (m_speed - closest_kart->getSpeed());
// calculate the approximate location of the aimed kart in 'time' seconds
btVector3 closestKartLoc = closest_kart->getTrans().getOrigin();
closestKartLoc += time*closest_kart->getVelocity();
// calculate the angle at which the projectile should be thrown
// to hit the aimed kart
float projectileAngle=atan2(-(closestKartLoc.getX() - kart->getTrans().getOrigin().getX()),
closestKartLoc.getY() - kart->getTrans().getOrigin().getY() );
// apply transformation to the bullet object
btMatrix3x3 m;
m.setEulerZYX(pitch, 0.0f, projectileAngle);
trans.setBasis(m);
}
else
{
trans = kart->getKartHeading();
}
createPhysics(y_offset, btVector3(0.0f, m_speed*2, 0.0f),
new btCylinderShape(0.5f*m_extend), 0.0f /* gravity */, false /* rotates */, reverse_mode );
m_rubber_band = new RubberBand(this, *kart);
m_rubber_band->ref();
new btCylinderShape(0.5f*m_extend), 0.0f /* gravity */, false /* rotates */, reverse_mode, &trans );
if(reverse_mode)
m_rubber_band = NULL;
else
{
m_rubber_band = new RubberBand(this, *kart);
m_rubber_band->ref();
}
m_keep_alive = -1;
} // Plunger
@ -79,6 +123,24 @@ void Plunger::update(float dt)
// Else: update the flyable and rubber band
Flyable::update(dt);
m_rubber_band->update(dt);
// FIXME - don't hardcode, put in config file
const float max_height = 1.0;
const float min_height = 0.2;
const float average_height = (m_max_height + m_min_height)/2;
if(getHoT()==Track::NOHIT) return;
float hat = getTrans().getOrigin().getZ()-getHoT();
// Use the Height Above Terrain to set the Z velocity.
// HAT is clamped by min/max height. This might be somewhat
// unphysical, but feels right in the game.
hat = std::max(std::min(hat, max_height) , min_height);
float delta = average_height - hat;
btVector3 v=getVelocity();
v.setZ( /* up-down force */ 10*delta); // FIXME - don't hardcode, move to config file
setVelocity(v);
} // update
// -----------------------------------------------------------------------------