?? particlesystem.cpp
字號(hào):
// ParticleSystem.cpp: implementation of the CParticleSystem class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "MyFire2.h"
#include "ParticleSystem.h"
#include <math.h>
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CParticleSystem::CParticleSystem()
{
m_fEmissionResidue = 0.0f;
m_bIsSuppressed = FALSE;
fVarx = 0.8f;
}
CParticleSystem::~CParticleSystem()
{
}
bool CParticleSystem::IsColliding()
{
return m_bIsColliding;
}
//////////////////////////////////////////////////
//粒子系統(tǒng)更新函數(shù)
CParticleSystem::Update(float fTime)
{
// fTime是絕對(duì)時(shí)間，必須計(jì)算相對(duì)時(shí)間間隔
float fTimeDelta = fTime - m_fTimeLastUpdate;
m_fTimeLastUpdate = fTime;
if (m_bIsMoving)
{
static float fThetaHoriz = 0.0f;
static float fThetaVert = 180.0f;
fThetaHoriz += 25.0f * fTimeDelta;
fThetaVert += 35.0f * fTimeDelta*fVarx;
if ( fThetaHoriz > 359.0f )
{
fThetaHoriz = 0.0f;
}
if ( fThetaVert > 359.0f )
{
fVarx = RANDOM_NUM*1.0f+1.0f;
fThetaVert = 0.0f;
}
m_vLocation.x = 20.0f * (float)cos( fThetaHoriz * 0.01745f );//*0.75f;
m_vLocation.y = 7.0f * (float)sin( fThetaVert * 0.01745f );//*0.75f;
m_vLocation.z = 20.0f * (float)sin( fThetaHoriz * 0.01745f )*(float)sin( fThetaVert * 0.01745f );//*0.75f;
}
else
{
m_vLocation.x = 0.0f;
m_vLocation.y = 0.0f;
m_vLocation.z = 0.0f;
}
m_uParticlesAlive = 0;
// 更新所有的粒子
for ( int i=0; i<MAX_PARTICLES; i++)
{
if (m_rParticles[i].m_fAge >= 0.0f )
if ( m_rParticles[i].Update( fTimeDelta ))
m_uParticlesAlive++;
}
float fParticlesNeeded = m_uParticlesPerSec * fTimeDelta + m_fEmissionResidue;
unsigned int uParticlesCreated = (unsigned int)fParticlesNeeded;
if ( !m_bIsSuppressed )
{
m_fEmissionResidue = fParticlesNeeded - uParticlesCreated;
}
else
{
m_fEmissionResidue = 0.0f;
uParticlesCreated = 0;
}
if ( uParticlesCreated > 0 )
{
// 循環(huán)所有粒子
for ( i=0; i<MAX_PARTICLES; i++ )
{
if ( !uParticlesCreated )
break;
// 判斷粒子生命
if ( m_rParticles[i].m_fAge < 0.0f )
{
// 定義新粒子的生命
m_rParticles[i].m_fAge = 0.0f;
m_rParticles[i].m_fLifetime = m_fLifeTime+RANDOM_NUM * m_fLifeVar;
Clamp( m_rParticles[i].m_fLifetime, MIN_LIFETIME, MAX_LIFETIME );
m_rParticles[i].m_fAlpha = m_fAlphaStart + RANDOM_NUM * m_fAlphaVar;
Clamp( m_rParticles[i].m_fAlpha, MIN_ALPHA, MAX_ALPHA );
m_rParticles[i].m_fAlphaDelta = (m_fAlphaEnd - m_rParticles[i].m_fAlpha) / m_rParticles[i].m_fLifetime;
// 粒子的顏色
m_rParticles[i].m_vColor.r = m_vColorStart.r+ RANDOM_NUM * m_vColorVar.r;
m_rParticles[i].m_vColor.g = m_vColorStart.g + RANDOM_NUM * m_vColorVar.g;
m_rParticles[i].m_vColor.b = m_vColorStart.b + RANDOM_NUM * m_vColorVar.b;
Clamp( m_rParticles[i].m_vColor.r, 0.0f, 1.0f );
Clamp( m_rParticles[i].m_vColor.g, 0.0f, 1.0f );
Clamp( m_rParticles[i].m_vColor.b, 0.0f, 1.0f );
m_rParticles[i].m_vColorDelta.r = ((m_vColorEnd.r+ RANDOM_NUM * m_vColorVar.r) - m_rParticles[i].m_vColor.r) / m_rParticles[i].m_fLifetime;
m_rParticles[i].m_vColorDelta.g = ((m_vColorEnd.g+ RANDOM_NUM * m_vColorVar.g) - m_rParticles[i].m_vColor.g) / m_rParticles[i].m_fLifetime;
m_rParticles[i].m_vColorDelta.b = ((m_vColorEnd.b+ RANDOM_NUM * m_vColorVar.b) - m_rParticles[i].m_vColor.b) / m_rParticles[i].m_fLifetime;
m_rParticles[i].m_fSize = m_fSizeStart + RANDOM_NUM * m_fSizeVar;
Clamp( m_rParticles[i].m_fSize, MIN_SIZE, MAX_SIZE );
m_rParticles[i].m_fSizeDelta = (m_fSizeEnd - m_rParticles[i].m_fSize) / m_rParticles[i].m_fLifetime;
// 定義重力
m_rParticles[i].m_vParticleGravity.x = m_vGravityStart.x * GRAVITY + RANDOM_NUM * m_fGravityVar*GRAVITY;
Clamp( m_rParticles[i].m_vParticleGravity.x, MIN_GRAVITY*GRAVITY, MAX_GRAVITY*GRAVITY );
m_rParticles[i].m_vGravityDelta.x =
( m_vGravityEnd.x*GRAVITY - m_rParticles[i].m_vParticleGravity.x ) / m_rParticles[i].m_fLifetime;
m_rParticles[i].m_vParticleGravity.y = m_vGravityStart.y * GRAVITY + RANDOM_NUM * m_fGravityVar*GRAVITY;
Clamp( m_rParticles[i].m_vParticleGravity.y, MIN_GRAVITY*GRAVITY, MAX_GRAVITY*GRAVITY );
m_rParticles[i].m_vGravityDelta.y =
( m_vGravityEnd.y*GRAVITY - m_rParticles[i].m_vParticleGravity.y ) / m_rParticles[i].m_fLifetime;
m_rParticles[i].m_vParticleGravity.z = m_vGravityStart.z * GRAVITY + RANDOM_NUM * m_fGravityVar*GRAVITY;
Clamp( m_rParticles[i].m_vParticleGravity.z, MIN_GRAVITY*GRAVITY, MAX_GRAVITY*GRAVITY );
m_rParticles[i].m_vGravityDelta.z =
( m_vGravityEnd.z*GRAVITY - m_rParticles[i].m_vParticleGravity.z ) / m_rParticles[i].m_fLifetime;
// 計(jì)算粒子的速度
m_vTempVelocity.x = (m_vLocation.x - m_vPrevLocation.x)/fTimeDelta;
m_vTempVelocity.y = (m_vLocation.y - m_vPrevLocation.y)/fTimeDelta;
m_vTempVelocity.z = (m_vLocation.z - m_vPrevLocation.z)/fTimeDelta;
// 從當(dāng)前位置和前一個(gè)位置發(fā)射粒子
m_rParticles[i].m_vLocation.x = m_vPrevLocation.x;
m_rParticles[i].m_vLocation.y = m_vPrevLocation.y;
m_rParticles[i].m_vLocation.z = m_vPrevLocation.z;
// 更新前一位置
m_rParticles[i].m_vPrevLocation.x = m_rParticles[i].m_vLocation.x;
m_rParticles[i].m_vPrevLocation.y = m_rParticles[i].m_vLocation.y;
m_rParticles[i].m_vPrevLocation.z = m_rParticles[i].m_vLocation.z;
// 定義發(fā)射器的方向
float RandomYaw = RANDOM_NUM * 3.14159f * 2.0f;
float RandomPitch = RANDOM_NUM * m_fTheta * 3.14159f ;/// 180.0f ;
// 利用球面坐標(biāo)定義速度矢量
m_rParticles[i].m_vVelocity.y = static_cast<float>(cos( RandomPitch ));
m_rParticles[i].m_vVelocity.x = static_cast<float>(sin(RandomPitch) * cos(RandomYaw));
m_rParticles[i].m_vVelocity.z = static_cast<float>(sin(RandomPitch) * sin(RandomYaw));
m_rParticles[i].m_vVelocity.x *= m_fSpeed ;
m_rParticles[i].m_vVelocity.y *= m_fSpeed ;
m_rParticles[i].m_vVelocity.z *= m_fSpeed ;
// 設(shè)置粒子的雙親
m_rParticles[i].SetParent(this);
// 減少所需粒子數(shù)
uParticlesCreated--;
}
}
}
// 將當(dāng)前位置設(shè)置為前一位置
m_vPrevLocation = m_vLocation;
}
// 繪制粒子系統(tǒng)
CParticleSystem::Draw(float x_Rot,float y_Rot)
{
int loop;
for (loop = 0; loop < MAX_PARTICLES; loop++)
{
// 如果粒子處于生命期,則繪制
if (m_rParticles[loop].m_fAge >= 0.0f)
{
glColor4f(m_rParticles[loop].m_vColor.r,m_rParticles[loop].m_vColor.g,
m_rParticles[loop].m_vColor.b,m_rParticles[loop].m_fAlpha);
glPushMatrix();
glTranslatef(m_rParticles[loop].m_vLocation.x,
m_rParticles[loop].m_vLocation.y,
m_rParticles[loop].m_vLocation.z);
glRotatef(y_Rot,0.0f,1.0f,0.0f);
glRotatef(x_Rot,1.0f,0.0f,0.0f);
glBegin(GL_TRIANGLE_STRIP);
glTexCoord2f(1.0f, 1.0f); glVertex3f( m_rParticles[loop].m_fSize, m_rParticles[loop].m_fSize, 0.0f); // Top Right
glTexCoord2f(0.0f, 1.0f); glVertex3f(-m_rParticles[loop].m_fSize, m_rParticles[loop].m_fSize, 0.0f); // Top Left
glTexCoord2f(1.0f, 0.0f); glVertex3f( m_rParticles[loop].m_fSize,-m_rParticles[loop].m_fSize, 0.0f); // Bottom Right
glTexCoord2f(0.0f, 0.0f); glVertex3f(-m_rParticles[loop].m_fSize,-m_rParticles[loop].m_fSize, 0.0f);// Bottom Left
glEnd();
glPopMatrix();
}
}
// 繪制地面
if( m_bIsColliding)
{
glPushAttrib(GL_TEXTURE_BIT);
// 關(guān)閉紋理
glDisable(GL_TEXTURE_2D);
glLineWidth(1.0f);
glColor4f(0.4f,0.6f,0.6f,0.9f);
// 繪制一個(gè)小燭臺(tái)
glBegin(GL_LINES);
glVertex3f( m_vLocation.x,m_vLocation.y-m_fSizeStart*0.5f,m_vLocation.z);
glVertex3f( m_vLocation.x,m_vLocation.y-m_fSizeStart*3.0f,m_vLocation.z);
glEnd();
// 繪制地面
glTranslatef(0.0f,FLOOR,0.0f);
glColor4f(0.0f,0.3f,0.3f,0.7f);
glBegin(GL_LINE_STRIP);
glVertex3f(-20.0f,-0.0f,-20.0f);
glVertex3f(-20.0f,-0.0f, 20.0f);
glVertex3f( 20.0f,-0.0f, 20.0f);
glVertex3f( 20.0f,-0.0f,-20.0f);
glVertex3f(-20.0f,-0.0f,-20.0f);
glEnd();
glBegin(GL_LINE_STRIP);
glVertex3f(-10.0f,-0.0f,-10.0f);
glVertex3f(-10.0f,-0.0f, 10.0f);
glVertex3f( 10.0f,-0.0f, 10.0f);
glVertex3f( 10.0f,-0.0f,-10.0f);
glVertex3f(-10.0f,-0.0f,-10.0f);
glEnd();
glPopAttrib();
}
}
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