float3 CCannon::GetWantedDir(const float3& diff)
{
// try to cache results, sacrifice some (not much too much even for a pewee) accuracy
// it saves a dozen or two expensive calculations per second when 5 guardians
// are shooting at several slow- and fast-moving targets
if (math::fabs(diff.x - lastDiff.x) < (SQUARE_SIZE / 4.0f) &&
math::fabs(diff.y - lastDiff.y) < (SQUARE_SIZE / 4.0f) &&
math::fabs(diff.z - lastDiff.z) < (SQUARE_SIZE / 4.0f)) {
return lastDir;
}
const float3 dir = GetWantedDir2(diff);
lastDiff = diff;
lastDir = dir;
return dir;
}
bool CCannon::HaveFreeLineOfFire(const float3& pos, bool userTarget, const CUnit* unit) const
{
if (!weaponDef->waterweapon && TargetUnitOrPositionInUnderWater(pos, unit))
return false;
if (projectileSpeed == 0) {
return true;
}
float3 dif(pos - weaponMuzzlePos);
float3 dir(GetWantedDir2(dif));
if (dir.SqLength() == 0) {
return false;
}
float3 flatDir(dif.x, 0, dif.z);
float flatLength = flatDir.Length();
if (flatLength == 0) {
return true;
}
flatDir /= flatLength;
const float linear = dir.y;
const float quadratic = gravity / (projectileSpeed * projectileSpeed) * 0.5f;
const float gc = ((collisionFlags & Collision::NOGROUND) == 0)?
ground->TrajectoryGroundCol(weaponMuzzlePos, flatDir, flatLength - 10, linear, quadratic):
-1.0f;
if (gc > 0.0f) {
return false;
}
const float spread =
((accuracy + sprayAngle) * 0.6f) *
((1.0f - owner->limExperience * weaponDef->ownerExpAccWeight) * 0.9f);
const float modFlatLength = flatLength - 30.0f;
//FIXME add a forcedUserTarget (a forced fire mode enabled with meta key or something) and skip the test below then
if (TraceRay::TestTrajectoryCone(weaponMuzzlePos, flatDir, modFlatLength,
dir.y, quadratic, spread, owner->allyteam, avoidFlags, owner)) {
return false;
}
return true;
}
bool CCannon::HaveFreeLineOfFire(const float3& pos, bool userTarget, const CUnit* unit) const
{
// assume we can still fire at partially submerged targets
if (!weaponDef->waterweapon && TargetUnitOrPositionUnderWater(pos, unit))
return false;
if (projectileSpeed == 0) {
return true;
}
float3 dif(pos - weaponMuzzlePos);
float3 dir(GetWantedDir2(dif));
if (dir.SqLength() == 0) {
return false;
}
float3 flatDir(dif.x, 0, dif.z);
float flatLength = flatDir.Length();
if (flatLength == 0) {
return true;
}
flatDir /= flatLength;
const float linear = dir.y;
const float quadratic = gravity / (projectileSpeed * projectileSpeed) * 0.5f;
const float groundDist = ((avoidFlags & Collision::NOGROUND) == 0)?
CGround::TrajectoryGroundCol(weaponMuzzlePos, flatDir, flatLength - 10, linear, quadratic):
-1.0f;
const float spread = (AccuracyExperience() + SprayAngleExperience()) * 0.6f * 0.9f;
if (groundDist > 0.0f) {
return false;
}
//FIXME add a forcedUserTarget (a forced fire mode enabled with meta key or something) and skip the test below then
if (TraceRay::TestTrajectoryCone(weaponMuzzlePos, flatDir, flatLength,
dir.y, quadratic, spread, owner->allyteam, avoidFlags, owner)) {
return false;
}
return true;
}
