particle.h

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/**********************************************************************
 *<
    FILE: particle.h

    DESCRIPTION: Particle system object

    CREATED BY: Rolf Berteig

    HISTORY: 10-18-95

 *> Copyright (c) 1994, All Rights Reserved.
 **********************************************************************/

#pragma once

#include "maxheap.h"
#include "meshlib.h"
#include "export.h"
#include "GraphicsTypes.h"

// forward declarations
class ParticleSys;

struct SphereData: public MaxHeapOperators{
 Point3 center;
 float radius,oradius,rsquare,tover4;
};

// Custom particle drawing callback
class CustomParticleDisplay: public MaxHeapOperators {
    public:
        virtual BOOL DrawParticle(GraphicsWindow *gw,ParticleSys &parts,int i)=0;
    };

class ParticleSys : public MaxHeapOperators {
    private:
        CustomParticleDisplay *draw;

        void DrawGW(GraphicsWindow *gw,DWORD flags,MarkerType type);

    public:
        Tab<Point3> points;     // The particles themselves
        Tab<Point3> vels;       // Velocities of each particle (optional)
        Tab<TimeValue> ages;    // Age of each particle (optional)
        Tab<float> radius;
        Tab<float> tension;
        float size;             // World space radius of a particle


        // Draws the particle system into the GW
        DllExport void Render(GraphicsWindow *gw,MarkerType type=POINT_MRKR);
        
        // Hit tests the particle system. Returns TRUE if a particle is hit.
        DllExport BOOL HitTest(GraphicsWindow *gw, HitRegion *hr, 
            int abortOnHit=FALSE,MarkerType type=POINT_MRKR);

        // Gets bounding box
        DllExport Box3 BoundBox(Matrix3 *tm=NULL);

        // Sets all counts to 0
        DllExport void FreeAll();

        // Sets the size. Flags indicate if optional params should be allocated
        DllExport void SetCount(int c,DWORD flags);

        int Count() {return points.Count();}
        Point3& operator[](int i) {return points[i];}

        // Is particle i alive?
        BOOL Alive(int i) {return ages[i]>=0;}

        // Sets custom draw callback
        void SetCustomDraw(CustomParticleDisplay *d) {draw=d;}
    };

// Flags for SetCount()
#define PARTICLE_VELS   (1<<0)
#define PARTICLE_AGES   (1<<1)
#define PARTICLE_RADIUS (1<<2)
#define PARTICLE_TENSION (1<<3)

class MetaParticle: public MaxHeapOperators {
    public:
        DllExport int CreateMetas(ParticleSys parts,Mesh *mesh,float threshold,float res,float strength,int many=1);
        DllExport int CreatePodMetas(SphereData *data,int num,Mesh *mesh,float threshold,float res,int many=1);
};