//****************************************************************************
//??Branch.cpp:?implementation?of?the?CBranch?class.
//
//??Copyright?（c）?Boris?J.?Wang?（e_boris2002@hotmail.com）?2002?-?2003
//??From?Institute?of?Computing?Technology?Chinese?Academy?of?Sciences
//????????????????????????????????????????????????Beijing?100871?China
//
//??THIS?CODE?AND?INFORMATION?IS?PROVIDED?“AS?IS“?WITHOUT?WARRANTY?OF?
//??ANY?KIND?EITHER?EXPRESSED?OR?IMPLIED?INCLUDING?BUT?NOT?LIMITED?TO?
//??THE?IMPLIED?WARRANTIES?OF?MERCHANTABILITY?AND/OR?FITNESS?FOR?A?
//??PARTICULAR?PURPOSE.
//****************************************************************************

#include?“stdafx.h“
#include?“opengl.h“
#include?“Branch.h“
#include?“tree.h“

#ifdef?_DEBUG
#undef?THIS_FILE
static?char?THIS_FILE[]=__FILE__;
#define?new?DEBUG_NEW
#endif

/////////////////////////////////////////////////////////////////////
//Implement?for?CSegment
////////////////////////////////////////////////////
CglMaterial?CSegment::BarkMTR;

float?CSegment::SegLeafSize	=?1.970f;

float?CSegment::LeafExpand	=?26.4f;

float?CSegment::SegExpand	=?26.4f;
float?CSegment::SegScaleLen?=?0.83f;
float?CSegment::SegScaleRad?=?0.75f;
float?CSegment::SegTwistInc?=?61.02f;
float?CSegment::SegSideExpand?=?58.8f;
float?CSegment::SegSideScaleDepth?=?0.81f;
float?CSegment::SegSideScale?=?0.93f;

CglTexture?CSegment::Tex（_T（“bark.bmp“）GL_Tex_BMP7）;

#define?SegDefaultLength?8.0f

CSegment::~CSegment（）
{
	if（SideBranch）
	{
		delete?SideBranch;
		SideBranch?=?NULL;
	}

	if（Leaves）
	{
		delete?Leaves;
		Leaves?=?NULL;
	}
}


CSegment::CSegment（）
{
	SetExpand（0.0f）;
	SetLength（SegDefaultLength）;
	SetRadius（0.8f）;
	SetTwist（0.0f）;

	SideBranch?=?NULL;
	Leaves?=?NULL;
}

void?CSegment::Render（CSegment?&Father）
{
	Tex.Apply（）;
	BarkMTR.Apply（）;
	glColor4f（000CTree::BranchShadowDensity）;

	glBegin（GL_QUAD_STRIP）;
		DefineOneLine（HalfRadius	TriRadius	Father.HalfRadius	Father.TriRadius	0.0f			）;????//?0/6
		DefineOneLine（-HalfRadius	TriRadius	-Father.HalfRadius	Father.TriRadius	0.1666666667f	）;?//?1/6
		DefineOneLine（-Radius		0.0f		-Father.Radius		0.0f				0.3333333333f	）;?//?2/6??and?so?on
		DefineOneLine（-HalfRadius	-TriRadius	-Father.HalfRadius	-Father.TriRadius	0.5f			）;
		DefineOneLine（HalfRadius	-TriRadius	Father.HalfRadius	-Father.TriRadius	0.6666666667f	）;
		DefineOneLine（Radius		0.0f		Father.Radius		0.0f				0.8333333333f	）;
		DefineOneLine（HalfRadius	TriRadius	Father.HalfRadius	Father.TriRadius	1.0f			）;????//?6/6
	glEnd（）;

	CTree::TotalQuad?+=?6;
	CTree::TotalVertex?+=?12;
	CTree::TotalNode?++;
	CTree::TotalMemory?+=?sizeof（CSegment）;
}

void?CSegment::DefineOneLine（GLfloat?x?GLfloat?z?GLfloat?fx?GLfloat?fz?GLfloat?Tex）
{
	glNormal3f（fx0.0ffz）;?
	glTexCoord2f（Tex0.0f）;?
	glVertex3f（fx?0.0f?fz）;?

	{GLfloat?x3y3z3x2z2x1;

		x1?=?-?z*SinTwist?+?x*CosTwist