/* Update channel animation variables, called on each frame */
void animate(void) {
uint8_t i;
struct channel_t *c, *p;
struct clip_t *d;
channelsLock();
for(i = 0; i < 3; i++) {
if(state.channels[i].clipCount == 0) {
/* No clips on channel */
continue;
} else if(clipGet(i, state.channels[i].current)->ready == 0) {
/* Current clip not ready so no clips on channel, really */
continue;
}
c = &state.channels[i];
p = &state.prev[i];
d = clipGet(i, c->current);
/* Playhead position */
if(c->current == p->current && c->now.pos == p->now.pos && c->locks.pos == 0.0) {
/* Same clip is current as at last frame and pos hasn't been changed and isn't locked */
animPos(c, d);
}
}
/* Store the current channel data for comparision next time around */
memcpy(state.prev, state.channels, 3 * sizeof(struct channel_t));
channelsUnlock();
}
bool CShootingAnimation::init()
{
if( !CAttackAnimation::checkInitialConditions() )
return false;
const CStack * shooter = attackingStack;
if(!shooter || myAnim->isDead())
{
endAnim();
return false;
}
//reverse unit if necessary
if (attackingStack && attackedStack && owner->getCurrentPlayerInterface()->cb->isToReverse(attackingStack->position, attackedStack->position, owner->creDir[attackingStack->ID], attackingStack->doubleWide(), owner->creDir[attackedStack->ID]))
{
owner->addNewAnim(new CReverseAnimation(owner, attackingStack, attackingStack->position, true));
return false;
}
// opponent must face attacker ( = different directions) before he can be attacked
if (attackingStack && attackedStack &&
owner->creDir[attackingStack->ID] == owner->creDir[attackedStack->ID])
return false;
// Create the projectile animation
//maximal angle in radians between straight horizontal line and shooting line for which shot is considered to be straight (absoulte value)
static const double straightAngle = 0.2;
// Get further info about the shooter e.g. relative pos of projectile to unit.
// If the creature id is 149 then it's a arrow tower which has no additional info so get the
// actual arrow tower shooter instead.
const CCreature *shooterInfo = shooter->getCreature();
if (shooterInfo->idNumber == CreatureID::ARROW_TOWERS)
{
int creID = owner->siegeH->town->town->clientInfo.siegeShooter;
shooterInfo = CGI->creh->creatures[creID];
}
ProjectileInfo spi;
spi.shotDone = false;
spi.creID = shooter->getCreature()->idNumber;
spi.stackID = shooter->ID;
// reverse if creature is facing right OR this is non-existing stack that is not tower (war machines)
spi.reverse = attackingStack ? !owner->creDir[attackingStack->ID] : shooter->getCreature()->idNumber != CreatureID::ARROW_TOWERS ;
spi.step = 0;
spi.frameNum = 0;
Point fromPos;
Point destPos;
// NOTE: two lines below return different positions (very notable with 2-hex creatures). Obtaining via creanims seems to be more precise
fromPos = owner->creAnims[spi.stackID]->pos.topLeft();
//xycoord = CClickableHex::getXYUnitAnim(shooter->position, true, shooter, owner);
destPos = CClickableHex::getXYUnitAnim(dest, attackedStack, owner);
// to properly translate coordinates when shooter is rotated
int multiplier = spi.reverse ? -1 : 1;
double projectileAngle = atan2(fabs((double)destPos.y - fromPos.y), fabs((double)destPos.x - fromPos.x));
if(shooter->position < dest)
projectileAngle = -projectileAngle;
// Calculate projectile start position. Offsets are read out of the CRANIM.TXT.
if (projectileAngle > straightAngle)
{
//upper shot
spi.x = fromPos.x + 222 + ( -25 + shooterInfo->animation.upperRightMissleOffsetX ) * multiplier;
spi.y = fromPos.y + 265 + shooterInfo->animation.upperRightMissleOffsetY;
}
else if (projectileAngle < -straightAngle)
{
//lower shot
spi.x = fromPos.x + 222 + ( -25 + shooterInfo->animation.lowerRightMissleOffsetX ) * multiplier;
spi.y = fromPos.y + 265 + shooterInfo->animation.lowerRightMissleOffsetY;
}
else
{
//straight shot
spi.x = fromPos.x + 222 + ( -25 + shooterInfo->animation.rightMissleOffsetX ) * multiplier;
spi.y = fromPos.y + 265 + shooterInfo->animation.rightMissleOffsetY;
}
destPos += Point(225, 225);
// recalculate angle taking in account offsets
//projectileAngle = atan2(fabs(destPos.y - spi.y), fabs(destPos.x - spi.x));
//if(shooter->position < dest)
// projectileAngle = -projectileAngle;
if (attackedStack)
{
double animSpeed = AnimationControls::getProjectileSpeed(); // flight speed of projectile
spi.lastStep = static_cast<int>(sqrt(static_cast<double>((destPos.x - spi.x) * (destPos.x - spi.x) + (destPos.y - spi.y) * (destPos.y - spi.y))) / animSpeed);
if(spi.lastStep == 0)
spi.lastStep = 1;
spi.dx = (destPos.x - spi.x) / spi.lastStep;
spi.dy = (destPos.y - spi.y) / spi.lastStep;
}
else
{
// Catapult attack
spi.catapultInfo.reset(new CatapultProjectileInfo(Point(spi.x, spi.y), destPos));
double animSpeed = AnimationControls::getProjectileSpeed() / 10;
spi.lastStep = abs((destPos.x - spi.x) / animSpeed);
spi.dx = animSpeed;
spi.dy = 0;
SDL_Surface * img = owner->idToProjectile[spi.creID]->ourImages[0].bitmap;
// Add explosion anim
Point animPos(destPos.x - 126 + img->w / 2,
destPos.y - 105 + img->h / 2);
owner->addNewAnim( new CSpellEffectAnimation(owner, catapultDamage ? "SGEXPL.DEF" : "CSGRCK.DEF", animPos.x, animPos.y));
}
auto & angles = shooterInfo->animation.missleFrameAngles;
double pi = boost::math::constants::pi<double>();
// only frames below maxFrame are usable: anything higher is either no present or we don't know when it should be used
size_t maxFrame = std::min<size_t>(angles.size(), owner->idToProjectile[spi.creID]->ourImages.size());
assert(maxFrame > 0);
// values in angles array indicate position from which this frame was rendered, in degrees.
// find frame that has closest angle to one that we need for this shot
size_t bestID = 0;
double bestDiff = fabs( angles[0] / 180 * pi - projectileAngle );
for (size_t i=1; i<maxFrame; i++)
{
double currentDiff = fabs( angles[i] / 180 * pi - projectileAngle );
if (currentDiff < bestDiff)
{
bestID = i;
bestDiff = currentDiff;
}
}
spi.frameNum = bestID;
// Set projectile animation start delay which is specified in frames
spi.animStartDelay = shooterInfo->animation.attackClimaxFrame;
owner->projectiles.push_back(spi);
//attack animation
shooting = true;
if(projectileAngle > straightAngle) //upper shot
group = CCreatureAnim::SHOOT_UP;
else if(projectileAngle < -straightAngle) //lower shot
group = CCreatureAnim::SHOOT_DOWN;
else //straight shot
group = CCreatureAnim::SHOOT_FRONT;
return true;
}
