TapestryEngine

A 2D Platformer Game Engine
Log | Files | Refs

6fa184444687cf11f07f1ab6d403657e538d26bf.svn-base (1421B)

      1 #include "Physics.h"
      2 
      3 //Spring
      4 Spring::Spring(int* pos, float* vel, float k,  int n, float damp, int Vmax, int Amax, int ExMax)
      5 {
      6 	mPos = pos;
      7 	mVelocity = vel;
      8 	mSpringK = k;
      9 	mDamper = damp;
     10 	mNeutral = n;
     11 	
     12 	mMaxExten = ExMax;
     13 	mMaxVel = Vmax;
     14 	mMaxAccel = Amax;
     15 }
     16 
     17 int Spring::ZeroNeutralAxis()
     18 {
     19 	mNeutral = *mPos;
     20 	return mNeutral;
     21 }
     22 
     23 float Spring::CalcAccel()
     24 {
     25 	float disp = (float)((mNeutral - *mPos));
     26 
     27 	if (mMaxExten != 0)
     28 	{
     29 		if (fabs(disp) > mMaxExten)
     30 		{
     31 			disp = (float)mMaxExten*GetSign(disp);
     32 		}
     33 	}
     34 
     35 	float Accel = (disp)*mSpringK;
     36 	if (mMaxAccel != 0)
     37 	{
     38 		if (fabs(Accel) > mMaxAccel)
     39 		{
     40 			//gCons->ConsPrintf("Bouyant Accel = %f\n", mMaxAccel*GetSign(Accel));
     41 			return mMaxAccel*GetSign(Accel);
     42 		}
     43 	}
     44 	//gCons->ConsPrintf("Bouyant Accel = %f\n", Accel);
     45 	return Accel;
     46 }
     47 
     48 bool Spring::CalcVelocity()
     49 {
     50 	if (mMaxVel != 0)
     51 	{
     52 		if ( abs( (int)(*mVelocity + CalcAccel()) ) > mMaxVel)
     53 		{
     54 			*mVelocity = mMaxVel*GetSign(*mVelocity);
     55 			return true;
     56 		}
     57 	}
     58 	//*mVelocity += CalcAccel();
     59 	*mVelocity = (*mVelocity + CalcAccel())*mDamper;
     60 	//gCons->ConsPrintf("Spring Vel = %f\n", *mVelocity);
     61 	return true;
     62 }
     63 
     64 //Physics
     65 PhysicsManager::PhysicsManager(float GravAccel, float BouyancyK, int* pos, float* Xvel, float* Yvel, bool Grav )
     66 {
     67 	mGravAccel = GravAccel;
     68 	mGravity = Grav;
     69 	mFloating = false;
     70 	mXvel = Xvel;
     71 	mYvel = Yvel;
     72 	mBouyancy = Spring(pos, Yvel, BouyancyK, 0, (float)0.85, 9, 0, 10);
     73 }