public void processInteraction(float deltaTime)
{
int i = 0;
float[] friction = new float[NUM_COLLISION_POINTS];
float avg_friction = 0.0f;
bool[] hit_area = new bool[NUM_COLLISION_POINTS];
for (i = 0; i < NUM_COLLISION_POINTS; i += 1)
{
VectorF colpoint = this.collPointOff[i].clone();
colpoint.rotate(this.direction.angle());
colpoint.add(this.position);
this.collPoint[i] = colpoint;
int room_x = FloatToInt(colpoint.x, eRoundNearest);
int room_y = FloatToInt(colpoint.y, eRoundNearest);
int screen_x = room_x - GetViewportX();
int screen_y = room_y - GetViewportY();
int area = GetWalkableAreaAt(screen_x, screen_y);
if (area == 0)
{
hit_area[i] = true;
}
else
{
friction[i] = Track.TerraSlideFriction[area];
avg_friction += friction[i];
this.terrafriction[i] = friction[i];
}
this.colpt[i].x = FloatToInt(colpoint.x, eRoundNearest);
this.colpt[i].y = FloatToInt(colpoint.y, eRoundNearest);
}
avg_friction /= IntToFloat(NUM_COLLISION_POINTS);
this.friction = avg_friction;
for (i = 0; i < NUM_COLLISION_POINTS; i += 1)
{
if (!hit_area[i])
{
continue;
}
VectorF impact = VectorF.subtract(this.position, this.collPoint[i]);
impact.normalize();
impact.scale(Maths.AbsF(this.driveVelocityValue));
this.impactVelocity.add(impact);
float projection = VectorF.projection(impact, this.driveVelocity);
if (this.driveVelocityValue < 0.0f)
{
projection = -projection;
}
this.driveVelocityValue += projection;
}
}
public void RunCollision(VectorF impactVelocity, float deltaTime)
{
if (this.numHits == 0)
{
return;
}
VectorF posImpact = VectorF.zero();
VectorF negImpact = VectorF.zero();
int i = 0;
for (i = 0; i < NUM_COLLISION_POINTS; i += 1)
{
if (this.collPtHit[i] < 0)
{
continue;
}
if (this.oldCollPtHit[i] == this.collPtHit[i])
{
continue;
}
VectorF impact = VectorF.subtract(this.collPoint[i], this.oldCollPt[i]);
if (impact.isZero())
{
continue;
}
impact.normalize();
float velProjection = VectorF.projection(this.velocity, impact);
if (velProjection > 0.0f)
{
impact.scale(-velProjection * (2.0f - this.hardImpactLossFactor));
posImpact.max(impact);
negImpact.min(impact);
}
}
impactVelocity.add(posImpact);
impactVelocity.add(negImpact);
}
public VectorF DetectCollision(VectorF[] rect, VectorF otherVelocity, int otherIndex)
{
this.numCarHits = 0;
VectorF p21 = VectorF.subtract(rect[1], rect[0]);
VectorF p41 = VectorF.subtract(rect[3], rect[0]);
float p21magnitude_squared = p21.x * p21.x + p21.y * p21.y;
float p41magnitude_squared = p41.x * p41.x + p41.y * p41.y;
int i = 0;
for (i = 0; i < NUM_COLLISION_POINTS; i += 1)
{
this.collPtCarHit[i] = -1;
VectorF p = VectorF.subtract(this.collPoint[i], rect[0]);
float pp21 = p.x * p21.x + p.y * p21.y;
if (pp21 >= 0.0 && pp21 <= p21magnitude_squared)
{
float pp41 = p.x * p41.x + p.y * p41.y;
if (pp41 >= 0.0 && pp41 <= p41magnitude_squared)
{
this.collPtCarHit[i] = otherIndex;
this.numCarHits += 1;
}
}
}
if (this.numCarHits == 0)
{
return(null);
}
VectorF impactVelocity = new VectorF();
VectorF posImpact = VectorF.zero();
VectorF negImpact = VectorF.zero();
for (i = 0; i < NUM_COLLISION_POINTS; i += 1)
{
if (this.collPtCarHit[i] < 0)
{
continue;
}
if (this.oldCollPtCarHit[i] == this.collPtCarHit[i])
{
continue;
}
VectorF impact = VectorF.subtract(this.collPoint[i], this.oldCollPt[i]);
if (impact.isZero())
{
continue;
}
impact.normalize();
float velProjection = VectorF.projection(this.velocity, impact);
if (velProjection > 0.0f)
{
impact.scale(-velProjection * (1.0f - this.softImpactLossFactor));
posImpact.max(impact);
negImpact.min(impact);
impact.negate();
impact.normalize();
}
float otherProjection = VectorF.projection(otherVelocity, impact);
if (otherProjection < 0.0f)
{
impact.scale(otherProjection * (1.0f - this.softImpactLossFactor));
posImpact.max(impact);
negImpact.min(impact);
}
}
impactVelocity.add(posImpact);
impactVelocity.add(negImpact);
return(impactVelocity);
}
public void RunPhysics(float deltaTime)
{
int i = 0;
if (this.strictCollisions && this.numHits > 0)
{
float x = 0f;
float y = 0f;
for (i = 0; i < NUM_COLLISION_POINTS; i += 1)
{
this.collPoint[i].set(this.oldCollPt[i]);
this.collPtHit[i] = this.oldCollPtHit[i];
x += this.collPoint[i].x;
y += this.collPoint[i].y;
}
this.position.x = x / IntToFloat(NUM_COLLISION_POINTS);
this.position.y = y / IntToFloat(NUM_COLLISION_POINTS);
}
else
{
for (i = 0; i < NUM_COLLISION_POINTS; i += 1)
{
this.oldCollPt[i].set(this.collPoint[i]);
}
}
for (i = 0; i < NUM_COLLISION_POINTS; i += 1)
{
this.oldCollPtHit[i] = this.collPtHit[i];
this.oldCollPtCarHit[i] = this.collPtCarHit[i];
}
this.RunPhysicsBase(deltaTime);
this.UpdateBody();
this.UpdateEnviroment();
this.enginePower = this.engineMaxPower * this.engineAccelerator;
this.driveWheelTorque = this.enginePower;
this.driveWheelTorque -= this.driveWheelTorque * this.brakePower;
this.driveWheelForce = this.driveWheelTorque * this.driveWheelGrip;
VectorF rollDirection = this.direction.clone();
VectorF slideDirection = rollDirection.clone();
slideDirection.rotate(Maths.Pi / 2.0f);
float rollingVelocity = VectorF.projection(this.velocity, rollDirection);
float slidingVelocity = VectorF.projection(this.velocity, slideDirection);
this.turningAccel.makeZero();
if (this.velocity.isZero())
{
this.angularVelocity = this.steeringWheelAngle * this.stillTurningVelocity;
}
else
{
if (this.steeringWheelAngle != 0.0f)
{
float steerAngle = this.steeringWheelAngle;
VectorF driveWheelPos = this.position.clone();
VectorF steerWheelPos = this.position.clone();
driveWheelPos.addScaled(this.direction, -this.distanceBetweenAxles / 2.0f);
steerWheelPos.addScaled(this.direction, this.distanceBetweenAxles / 2.0f);
VectorF driveWheelMovement = rollDirection.clone();
VectorF steerWheelMovement = rollDirection.clone();
steerWheelMovement.rotate(steerAngle);
driveWheelPos.addScaled(driveWheelMovement, rollingVelocity);
steerWheelPos.addScaled(steerWheelMovement, rollingVelocity);
VectorF newPosDir = VectorF.subtract(steerWheelPos, driveWheelPos);
newPosDir.normalize();
this.angularVelocity = VectorF.angleBetween(this.direction, newPosDir);
this.angularVelocity *= this.envGrip;
float dumb_drift_factor = Maths.ArcTan(Maths.AbsF(rollingVelocity / this.driftVelocityFactor)) / (Maths.Pi / 2.0f);
this.turningAccel = VectorF.subtract(newPosDir, rollDirection);
this.turningAccel.scale(rollingVelocity * (1.0f - dumb_drift_factor) * this.envGrip);
}
else
{
this.angularVelocity = 0.0f;
}
}
VectorF rollResDir = rollDirection.clone();
rollResDir.scale(-rollingVelocity);
rollResDir.normalize();
VectorF slideResDir = slideDirection.clone();
slideResDir.scale(-slidingVelocity);
slideResDir.normalize();
float driveForce = (this.driveWheelForce * deltaTime) / this.bodyMass;
rollingVelocity = Maths.AbsF(rollingVelocity);
slidingVelocity = Maths.AbsF(slidingVelocity);
float slide_friction = this.envSlideFriction * this.weightForce;
float roll_friction = this.envRollFriction * this.weightForce;
float airres_force = 0.5f * Track.AirResistance * this.bodyAerodynamics;
float env_res_force = this.envResistance;
float rollAF = ((slide_friction * this.brakePower + roll_friction * (1.0f - this.brakePower) + airres_force * rollingVelocity * rollingVelocity + env_res_force * rollingVelocity) * deltaTime) / this.bodyMass;
float slideAF = ((slide_friction + airres_force * slidingVelocity * slidingVelocity + env_res_force * slidingVelocity) * deltaTime) / this.bodyMass;
rollAF = Maths.ClampF(rollAF, 0.0f, rollingVelocity);
slideAF = Maths.ClampF(slideAF, 0.0f, slidingVelocity);
this.infoRollAntiforce = rollAF;
this.infoSlideAntiforce = slideAF;
this.velocity.addScaled(rollDirection, driveForce);
float x1 = this.velocity.x;
float y1 = this.velocity.y;
this.velocity.addScaled(slideResDir, slideAF);
this.velocity.addScaled(rollResDir, rollAF);
float x2 = this.velocity.x;
float y2 = this.velocity.y;
if (x1 >= 0.0 && x2 < 0.0 || x1 <= 0.0 && x2 > 0.0f)
{
this.velocity.x = 0.0f;
}
if (y1 >= 0.0 && y2 < 0.0 || y1 <= 0.0 && y2 > 0.0f)
{
this.velocity.y = 0.0f;
}
this.velocity.addScaled(this.turningAccel, deltaTime);
VectorF impactVelocity = VectorF.zero();
this.RunCollision(impactVelocity, deltaTime);
this.velocity.add(impactVelocity);
this.infoImpact.set(impactVelocity);
}
