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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "Game/TraceRay.h"
#include "Map/Ground.h"
#include "MissileLauncher.h"
#include "Sim/MoveTypes/StrafeAirMoveType.h"
#include "Sim/Projectiles/WeaponProjectiles/MissileProjectile.h"
#include "Sim/Projectiles/WeaponProjectiles/WeaponProjectile.h"
#include "Sim/Units/Unit.h"
#include "WeaponDefHandler.h"
#include "System/mmgr.h"
CR_BIND_DERIVED(CMissileLauncher, CWeapon, (NULL));
CR_REG_METADATA(CMissileLauncher,(
CR_RESERVED(8)
));
CMissileLauncher::CMissileLauncher(CUnit* owner)
: CWeapon(owner)
{
}
CMissileLauncher::~CMissileLauncher(void)
{
}
void CMissileLauncher::Update(void)
{
if (targetType != Target_None) {
weaponPos = owner->pos + owner->frontdir * relWeaponPos.z + owner->updir * relWeaponPos.y + owner->rightdir * relWeaponPos.x;
weaponMuzzlePos = owner->pos + owner->frontdir * relWeaponMuzzlePos.z + owner->updir * relWeaponMuzzlePos.y + owner->rightdir * relWeaponMuzzlePos.x;
if (!onlyForward) {
wantedDir = targetPos - weaponPos;
float dist = wantedDir.Length();
predict = dist / projectileSpeed;
wantedDir /= dist;
if (weaponDef->trajectoryHeight > 0.0f) {
wantedDir.y += weaponDef->trajectoryHeight;
wantedDir.Normalize();
}
}
}
CWeapon::Update();
}
void CMissileLauncher::FireImpl()
{
float3 dir;
if (onlyForward) {
dir = owner->frontdir;
} else if (weaponDef->fixedLauncher) {
dir = weaponDir;
} else {
dir = targetPos - weaponMuzzlePos;
dir.Normalize();
if (weaponDef->trajectoryHeight > 0.0f) {
dir.y += weaponDef->trajectoryHeight;
dir.Normalize();
}
}
dir +=
((gs->randVector() * sprayAngle + salvoError) *
(1.0f - owner->limExperience * weaponDef->ownerExpAccWeight));
dir.Normalize();
float3 startSpeed = dir * weaponDef->startvelocity;
if (onlyForward && dynamic_cast<CStrafeAirMoveType*>(owner->moveType))
startSpeed += owner->speed;
new CMissileProjectile(weaponMuzzlePos, startSpeed, owner, damageAreaOfEffect,
projectileSpeed,
weaponDef->flighttime == 0
? (int) (range / projectileSpeed + 25 * weaponDef->selfExplode)
: weaponDef->flighttime,
targetUnit, weaponDef, targetPos);
}
bool CMissileLauncher::TryTarget(const float3& pos, bool userTarget, CUnit* unit)
{
if (!CWeapon::TryTarget(pos, userTarget, unit))
return false;
if (!weaponDef->waterweapon && TargetUnitOrPositionInWater(pos, unit))
return false;
float3 dir = pos - weaponMuzzlePos;
if (weaponDef->trajectoryHeight > 0.0f) {
// do a different test depending on if the missile has high
// trajectory (parabolic vs. linear ground intersection; in
// the latter case, HaveFreeLineOfFire() checks the NOGROUND
// collision flag for us)
float3 flatDir(dir.x, 0, dir.z);
dir.SafeNormalize();
float flatLength = flatDir.Length();
if (flatLength == 0)
return true;
flatDir /= flatLength;
const float linear = dir.y + weaponDef->trajectoryHeight;
const float quadratic = -weaponDef->trajectoryHeight / flatLength;
const float gc = ((collisionFlags & Collision::NOGROUND) == 0)?
ground->TrajectoryGroundCol(weaponMuzzlePos, flatDir, flatLength - 30, linear, quadratic):
-1.0f;
const float modFlatLength = flatLength - 30.0f;
if (gc > 0.0f)
return false;
if (avoidFriendly && TraceRay::TestTrajectoryCone(weaponMuzzlePos, flatDir, modFlatLength, linear, quadratic, 0, 8, owner->allyteam, true, false, false, owner)) {
return false;
}
if (avoidNeutral && TraceRay::TestTrajectoryCone(weaponMuzzlePos, flatDir, modFlatLength, linear, quadratic, 0, 8, owner->allyteam, false, true, false, owner)) {
return false;
}
if (avoidFeature && TraceRay::TestTrajectoryCone(weaponMuzzlePos, flatDir, modFlatLength, linear, quadratic, 0, 8, owner->allyteam, false, false, true, owner)) {
return false;
}
} else {
const float length = dir.Length();
if (length == 0)
return true;
dir /= length;
if (!onlyForward) {
if (!HaveFreeLineOfFire(weaponMuzzlePos, dir, length, unit)) {
return false;
}
} else {
float3 goaldir = pos - owner->pos;
goaldir.SafeNormalize();
if (owner->frontdir.dot(goaldir) < maxForwardAngleDif)
return false;
}
if (avoidFriendly && TraceRay::TestCone(weaponMuzzlePos, dir, length, (accuracy + sprayAngle), owner->allyteam, true, false, false, owner)) {
return false;
}
if (avoidNeutral && TraceRay::TestCone(weaponMuzzlePos, dir, length, (accuracy + sprayAngle), owner->allyteam, false, true, false, owner)) {
return false;
}
if (avoidFeature && TraceRay::TestCone(weaponMuzzlePos, dir, length, (accuracy + sprayAngle), owner->allyteam, false, false, true, owner)) {
return false;
}
}
return true;
}
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