//?Auth:?zousong@cad.zju.edu.cn
//?Date:?2008-12-25

//?定義是否每個(gè)面片使用隨機(jī)顏色值
#define?RANDOM_COLOR?1

#include?
#include?
#include?
#include?
#include?
#include?
#ifdef?RANDOM_COLOR
#include?
#include?
#endif

using?namespace?std;

#define?MAX_WIDTH?（1024*2）
#define?MAX_HEIGHT?（768*2）

//定義圖像
#define	INIT_WIDTH?1024
#define	INIT_HEIGHT?768
GLubyte?image[INIT_HEIGHT][INIT_WIDTH][3];
//?定義顏色結(jié)構(gòu)體
typedef?struct??
{
	unsigned?char?r?b?g?a;
}?color_t;

//?定義點(diǎn)結(jié)構(gòu)
typedef?struct??
{
	double?x?y?z;
}?point_t;

//?定義分類(lèi)邊表
typedef?struct?_line_t?
{
	int?x;						//?邊的上端點(diǎn)的x坐標(biāo)
	double?dx;					//?相鄰兩條掃描線(xiàn)交點(diǎn)的x坐標(biāo)差dx（-1/k）
	int?dy;						//?邊跨越的掃描線(xiàn)數(shù)目
	int?id;						//?邊所屬多邊形的編號(hào)
	//_line_t?*?next;				//?下個(gè)分類(lèi)邊表指針?由于本算法中分類(lèi)邊表存于STL?Vector中?故不需要
}?line_t;

//?定義活化邊表
typedef?struct?_active_line_t?
{
	double?xl;						//?左交點(diǎn)的x坐標(biāo)
	double?dxl;					//?（左交點(diǎn)邊上）兩相鄰掃描線(xiàn)交點(diǎn)的x坐標(biāo)之差
	int?dyl;					//?以和左交點(diǎn)所在邊相交的掃描線(xiàn)數(shù)為初值?以后向下每處理一條掃描線(xiàn)減1
	double?zl;						//?左交點(diǎn)處多邊形所在平面的深度值
	double?dzx;					//?沿掃描線(xiàn)向右走過(guò)一個(gè)像素時(shí)?多邊形所在平面的深度增量.?多于平面方程?dzx?=?-a/c?（c!=?0）
	double?dzy;					//?沿y方向向下移過(guò)一根掃描線(xiàn)時(shí)?多邊形所在平面的深度增量.?對(duì)于平面方程?dzy?=?b/c?（c!=?0）

#if?0??//?由于邊對(duì)分拆在兩個(gè)活化邊表結(jié)構(gòu)中，故右節(jié)點(diǎn)的元素可以省略
	//	double?xr;						//?右交點(diǎn)的x坐標(biāo)
	//	double?dxr;					//?（右交點(diǎn)邊上）兩相鄰掃描線(xiàn)交點(diǎn)的x坐標(biāo)之差
	//	int?dyr;					//?以右交點(diǎn)所在邊相交的掃描線(xiàn)數(shù)為初值?以后向下每處理一條掃描線(xiàn)減1	
#endif
	//	int	id;						//?交點(diǎn)所在多邊形的編號(hào)?由于將活化邊表存于各自所屬的活化多邊形中?故所屬I(mǎi)D不需要保存
	//_active_line_t?*?next;		//?下個(gè)活化邊表指針?由于本算法中活化邊表存于STL?Vector中?故不需要
}?active_line_t;

//?定義分類(lèi)多邊形表?||??活化多邊形表
typedef?struct??_poly_t
{
	int?id;						//?多邊形編號(hào)
	double?abcd;				//?多邊形所在的平面的方程系數(shù)?ax?+?by?+?cz?+?d?=?0
	int?dy;						//?多邊形跨越的掃描線(xiàn)數(shù)目?||?多邊形跨越的剩余掃描線(xiàn)數(shù)目
	color_t?color;			//?多邊形顏色
	vector??ale;??//?活化邊表?放在活化多邊形中?對(duì)于分類(lèi)多邊形表無(wú)意義
	//_poly_t?*?next;				//?下個(gè)分類(lèi)多邊形指針?||?下個(gè)活化多邊形指針?由于本算法中多邊形表存于STL?Vector中?故不需要
}?poly_t;


inline?bool?is_zero（double?f）
{
	if?（abs（f）?		return?true;
	return?false;
}

inline?int?double_to_int（double?f）
{
	return?（int）（f+0.5）;
}

//?對(duì)活化多邊形表排序的比較函數(shù)?
bool?cmp（const?active_line_t?&lhs?const?active_line_t?&rhs）
{
	if?（double_to_int（lhs.xl）?		return?true;
	}?else?if?（?double_to_int（lhs.xl）?==?double_to_int（rhs.xl）??）{
		if?（double_to_int（lhs.dxl）?			return?true;
	}
	return?false;
}


//?從obj文件中讀取的點(diǎn)
vector?	point;
//?分類(lèi)多形型表
vector?	poly[MAX_HEIGHT];
//?分類(lèi)邊表
vector?		line[MAX_HEIGHT];
//?活化多邊形表?內(nèi)部包含各個(gè)活化多邊形表中的活化邊表對(duì)
vector??ape;


//?z值數(shù)組
double						z[MAX_WIDTH];
//?顏色數(shù)組
color_t					color[MAX_WIDTH];
//?處理字符串用的buffer
char						buf[1024];

int?cal（const?char?*?file_name?int?max_width?int?max_height?double?scale）
{
	//?判斷參數(shù)是否合法
	if?（file_name?==?NULL?||?max_width?<=?0?||?max_width?>?MAX_WIDTH?||?max_height?<=?0?||?max_height?>?MAX_HEIGHT?||?scale?		printf（“cal?err!\n“）;
		return?-1;
	}

#ifdef?

?屬性????????????大小?????日期????時(shí)間???名稱(chēng)
-----------?---------??----------?-----??----

?????文件??????16535??2007-12-30?10:48??bin\cone.obj

?????文件????????839??2008-01-04?01:34??bin\cube.obj

?????文件??????27670??2008-09-16?14:54??bin\glut.h

?????文件?????237568??2008-09-16?14:54??bin\glut32.dll

?????文件??????28728??2008-09-16?14:54??bin\glut32.lib

?????文件????????188??2008-12-31?19:46??bin\run.bat

?????文件?????122880??2008-12-31?19:15??bin\SL_Z_buffer.exe

?????文件??????57515??2007-12-30?10:48??bin\sphere.obj

?????文件??????61417??2007-12-30?10:48??bin\teapot.obj

?????文件????????286??2008-01-01?20:42??bin\test.obj

?????文件??????33973??2007-12-30?10:48??bin\torus.obj

?????文件?????179844??2007-12-30?10:48??bin\torusknot.obj

?????文件????3080597??2008-01-03?23:58??bin\venusm.obj

?????文件?????122880??2008-12-31?19:15??SL_Z_buffer\debug\SL_Z_buffer.exe

?????文件??????16535??2007-12-30?10:48??SL_Z_buffer\SL_Z_buffer\cone.obj

?????文件????????839??2008-01-04?01:34??SL_Z_buffer\SL_Z_buffer\cube.obj

?????文件???????9346??2010-11-06?10:56??SL_Z_buffer\SL_Z_buffer\Debug\BuildLog.htm

?????文件??????????2??2011-01-14?11:18??SL_Z_buffer\SL_Z_buffer\Debug\cl.command.1.tlog

?????文件??????????2??2011-01-14?11:18??SL_Z_buffer\SL_Z_buffer\Debug\CL.read.1.tlog

?????文件??????????2??2011-01-14?11:18??SL_Z_buffer\SL_Z_buffer\Debug\CL.write.1.tlog

?????文件?????????65??2008-12-31?19:15??SL_Z_buffer\SL_Z_buffer\Debug\mt.dep

?????文件????????145??2008-12-31?19:15??SL_Z_buffer\SL_Z_buffer\Debug\SL_Z_buffer.exe.intermediate.manifest

?????文件????????114??2011-01-14?11:18??SL_Z_buffer\SL_Z_buffer\Debug\SL_Z_buffer.lastbuildstate

?????文件????????994??2011-01-14?11:18??SL_Z_buffer\SL_Z_buffer\Debug\SL_Z_buffer.log

?????文件??????????0??2011-01-14?11:18??SL_Z_buffer\SL_Z_buffer\Debug\SL_Z_buffer.unsuccessfulbuild

?????文件??????86016??2011-01-14?11:18??SL_Z_buffer\SL_Z_buffer\Debug\vc100.pdb

?????文件?????117760??2010-11-06?10:56??SL_Z_buffer\SL_Z_buffer\Debug\vc80.idb

?????文件?????179301??2008-12-31?19:15??SL_Z_buffer\SL_Z_buffer\Debug\z_buffer.obj

?????文件??????27670??2008-09-16?14:54??SL_Z_buffer\SL_Z_buffer\glut.h

?????文件?????237568??2008-09-16?14:54??SL_Z_buffer\SL_Z_buffer\glut32.dll

............此處省略35個(gè)文件信息