用DDR法画直线
可是用C++编译器确出现错误．请教该怎么做啊
#include "stdio.h"
#include "graphics.h"
void DDALine(int x0,int y0,int x1,int y1,int color)
{ int x;
float dx,dy,y,k;
dx=x1-x0;
dy=y1-y0;
k=dy/dx;
y=y0;
for(x=x0;x<=x1;x++)
{
putpixel(x,(int)(y+0.5),color);
y=y+k;
}
}
void main()
{
int gdriver=DETECT,gmode=0,a,b,c,d,e;
registerbgidriver(EGAVGA_driver);
initgraph(&gdriver,&gmode,"");
scanf("%d%d%d%d%d",&a,&b,&c,&d,&e);
DDALine(a,b,c,d,e);
getch();
}

DDA直线生成算法吧 C++编译器里没有graphics.h 的 你用TC试试

TC 2。0也没有

有的,你到include目录下找找,应该有,否则就是你的TC安装不完整

没有找到啊，请你说一下怎么找到？

那你的TC安装不完整,请重新下载

/* graphics.h

Definitions for Graphics Package.

Copyright (c) Borland International 1987,1988
All Rights Reserved.
*/

#if __STDC__
#define _Cdecl
#else
#define _Cdecl cdecl
#endif

#if !defined(__GRAPHX_DEF_)
#define __GRAPHX_DEF_

enum graphics_errors { /* graphresult error return codes */
grOk = 0,
grNoInitGraph = -1,
grNotDetected = -2,
grFileNotFound = -3,
grInvalidDriver = -4,
grNoLoadMem = -5,
grNoScanMem = -6,
grNoFloodMem = -7,
grFontNotFound = -8,
grNoFontMem = -9,
grInvalidMode = -10,
grError = -11, /* generic error */
grIOerror = -12,
grInvalidFont = -13,
grInvalidFontNum = -14,
grInvalidVersion = -18
};

enum graphics_drivers { /* define graphics drivers */
DETECT, /* requests autodetection */
CGA, MCGA, EGA, EGA64, EGAMONO, IBM8514, /* 1 - 6 */
HERCMONO, ATT400, VGA, PC3270, /* 7 - 10 */
CURRENT_DRIVER = -1
};

enum graphics_modes { /* graphics modes for each driver */
CGAC0 = 0, /* 320x200 palette 0; 1 page */
CGAC1 = 1, /* 320x200 palette 1; 1 page */
CGAC2 = 2, /* 320x200 palette 2: 1 page */
CGAC3 = 3, /* 320x200 palette 3; 1 page */
CGAHI = 4, /* 640x200 1 page */
MCGAC0 = 0, /* 320x200 palette 0; 1 page */
MCGAC1 = 1, /* 320x200 palette 1; 1 page */
MCGAC2 = 2, /* 320x200 palette 2; 1 page */
MCGAC3 = 3, /* 320x200 palette 3; 1 page */
MCGAMED = 4, /* 640x200 1 page */
MCGAHI = 5, /* 640x480 1 page */
EGALO = 0, /* 640x200 16 color 4 pages */
EGAHI = 1, /* 640x350 16 color 2 pages */
EGA64LO = 0, /* 640x200 16 color 1 page */
EGA64HI = 1, /* 640x350 4 color 1 page */
EGAMONOHI = 0, /* 640x350 64K on card, 1 page - 256K on card, 4 pages */
HERCMONOHI = 0, /* 720x348 2 pages */
ATT400C0 = 0, /* 320x200 palette 0; 1 page */
ATT400C1 = 1, /* 320x200 palette 1; 1 page */
ATT400C2 = 2, /* 320x200 palette 2; 1 page */
ATT400C3 = 3, /* 320x200 palette 3; 1 page */
ATT400MED = 4, /* 640x200 1 page */
ATT400HI = 5, /* 640x400 1 page */
VGALO = 0, /* 640x200 16 color 4 pages */
VGAMED = 1, /* 640x350 16 color 2 pages */
VGAHI = 2, /* 640x480 16 color 1 page */
PC3270HI = 0, /* 720x350 1 page */
IBM8514LO = 0, /* 640x480 256 colors */
IBM8514HI = 1 /*1024x768 256 colors */
};

/* Colors for setpalette and setallpalette */

#if !defined(__COLORS)
#define __COLORS

enum COLORS {
BLACK, /* dark colors */
BLUE,
GREEN,
CYAN,
RED,
MAGENTA,
BROWN,
LIGHTGRAY,
DARKGRAY, /* light colors */
LIGHTBLUE,
LIGHTGREEN,
LIGHTCYAN,
LIGHTRED,
LIGHTMAGENTA,
YELLOW,
WHITE
};
#endif

enum CGA_COLORS {
CGA_LIGHTGREEN = 1, /* Palette C0 Color Names */
CGA_LIGHTRED = 2,
CGA_YELLOW = 3,

CGA_LIGHTCYAN = 1, /* Palette C1 Color Names */
CGA_LIGHTMAGENTA = 2,
CGA_WHITE = 3,

CGA_GREEN = 1, /* Palette C2 Color Names */
CGA_RED = 2,
CGA_BROWN = 3,

CGA_CYAN = 1, /* Palette C3 Color Names */
CGA_MAGENTA = 2,
CGA_LIGHTGRAY = 3
};

enum EGA_COLORS {
EGA_BLACK = 0, /* dark colors */
EGA_BLUE = 1,
EGA_GREEN = 2,
EGA_CYAN = 3,
EGA_RED = 4,
EGA_MAGENTA = 5,
EGA_BROWN = 20,
EGA_LIGHTGRAY = 7,
EGA_DARKGRAY = 56, /* light colors */
EGA_LIGHTBLUE = 57,
EGA_LIGHTGREEN = 58,
EGA_LIGHTCYAN = 59,
EGA_LIGHTRED = 60,
EGA_LIGHTMAGENTA = 61,
EGA_YELLOW = 62,
EGA_WHITE = 63
};

enum line_styles { /* Line styles for get/setlinestyle */
SOLID_LINE = 0,
DOTTED_LINE = 1,
CENTER_LINE = 2,
DASHED_LINE = 3,
USERBIT_LINE = 4, /* User defined line style */
};

enum line_widths { /* Line widths for get/setlinestyle */
NORM_WIDTH = 1,
THICK_WIDTH = 3,
};

enum font_names {
DEFAULT_FONT = 0, /* 8x8 bit mapped font */
TRIPLEX_FONT = 1, /* "Stroked" fonts */
SMALL_FONT = 2,
SANS_SERIF_FONT = 3,
GOTHIC_FONT = 4
};

#define HORIZ_DIR 0 /* left to right */
#define VERT_DIR 1 /* bottom to top */

#define USER_CHAR_SIZE 0 /* user-defined char size */

enum fill_patterns { /* Fill patterns for get/setfillstyle */
EMPTY_FILL, /* fills area in background color */
SOLID_FILL, /* fills area in solid fill color */
LINE_FILL, /* --- fill */
LTSLASH_FILL, /* /// fill */
SLASH_FILL, /* /// fill with thick lines */
BKSLASH_FILL, /* \\\ fill with thick lines */
LTBKSLASH_FILL, /* \\\ fill */
HATCH_FILL, /* light hatch fill */
XHATCH_FILL, /* heavy cross hatch fill */
INTERLEAVE_FILL, /* interleaving line fill */
WIDE_DOT_FILL, /* Widely spaced dot fill */
CLOSE_DOT_FILL, /* Closely spaced dot fill */
USER_FILL /* user defined fill */
};

enum putimage_ops { /* BitBlt operators for putimage */
COPY_PUT, /* MOV */
XOR_PUT, /* XOR */
OR_PUT, /* OR */
AND_PUT, /* AND */
NOT_PUT /* NOT */
};

enum text_just { /* Horizontal and vertical justification
for settextjustify */
LEFT_TEXT = 0,
CENTER_TEXT = 1,
RIGHT_TEXT = 2,

BOTTOM_TEXT = 0,
/* CENTER_TEXT = 1, already defined above */
TOP_TEXT = 2
};

#define MAXCOLORS 15

struct palettetype {
unsigned char size;
signed char colors[MAXCOLORS+1];
};

struct linesettingstype {
int linestyle;
unsigned upattern;
int thickness;
};

struct textsettingstype {
int font;
int direction;
int charsize;
int horiz;
int vert;
};

struct fillsettingstype {
int pattern;
int color;
};

struct pointtype {
int x, y;
};

struct viewporttype {
int left, top, right, bottom;
int clip;
};

struct arccoordstype {
int x, y;
int xstart, ystart, xend, yend;
};

void far _Cdecl arc(int x, int y, int stangle, int endangle,
int radius);
void far _Cdecl bar(int left, int top, int right, int bottom);
void far _Cdecl bar3d(int left, int top, int right, int bottom,
int depth, int topflag);
void far _Cdecl circle(int x, int y, int radius);
void far _Cdecl cleardevice(void);
void far _Cdecl clearviewport(void);
void far _Cdecl closegraph(void);
void far _Cdecl detectgraph(int far *graphdriver,int far *graphmode);
void far _Cdecl drawpoly(int numpoints, int far *polypoints);
void far _Cdecl ellipse(int x, int y, int stangle, int endangle,
int xradius, int yradius);
void far _Cdecl fillellipse( int x, int y, int xradius, int yradius );
void far _Cdecl fillpoly(int numpoints, int far *polypoints);
void far _Cdecl floodfill(int x, int y, int border);
void far _Cdecl getarccoords(struct arccoordstype far *arccoords);
void far _Cdecl getaspectratio(int far *xasp, int far *yasp);
int far _Cdecl getbkcolor(void);
int far _Cdecl getcolor(void);
struct palettetype * far _Cdecl getdefaultpalette( void );
char * far _Cdecl getdrivername( void );
void far _Cdecl getfillpattern(char far *pattern);
void far _Cdecl getfillsettings(struct fillsettingstype far *fillinfo);
int far _Cdecl getgraphmode(void);
void far _Cdecl getimage(int left, int top, int right, int bottom,
void far *bitmap);
void far _Cdecl getlinesettings(struct linesettingstype far *lineinfo);
int far _Cdecl getmaxcolor(void);
int far _Cdecl getmaxmode(void);
int far _Cdecl getmaxx(void);
int far _Cdecl getmaxy(void);
char * far _Cdecl getmodename( int mode_number );
void far _Cdecl getmoderange(int graphdriver, int far *lomode,
int far *himode);
unsigned far _Cdecl getpixel(int x, int y);
void far _Cdecl getpalette(struct palettetype far *palette);
int far _Cdecl getpalettesize( void );
void far _Cdecl gettextsettings(struct textsettingstype far *texttypeinfo);
void far _Cdecl getviewsettings(struct viewporttype far *viewport);
int far _Cdecl getx(void);
int far _Cdecl gety(void);
void far _Cdecl graphdefaults(void);
char * far _Cdecl grapherrormsg(int errorcode);
void far _Cdecl _graphfreemem(void far *ptr, unsigned size);
void far * far _Cdecl _graphgetmem(unsigned size);
int far _Cdecl graphresult(void);
unsigned far _Cdecl imagesize(int left, int top, int right, int bottom);
void far _Cdecl initgraph(int far *graphdriver,
int far *graphmode,
char far *pathtodriver);
int far _Cdecl installuserdriver( char far *name, int huge (*detect)(void) );
int far _Cdecl installuserfont( char far *name );
void far _Cdecl line(int x1, int y1, int x2, int y2);
void far _Cdecl linerel(int dx, int dy);
void far _Cdecl lineto(int x, int y);
void far _Cdecl moverel(int dx, int dy);
void far _Cdecl moveto(int x, int y);
void far _Cdecl outtext(char far *textstring);
void far _Cdecl outtextxy(int x, int y, char far *textstring);
void far _Cdecl pieslice(int x, int y, int stangle, int endangle,
int radius);
void far _Cdecl putimage(int left, int top, void far *bitmap, int op);
void far _Cdecl putpixel(int x, int y, int color);
void far _Cdecl rectangle(int left, int top, int right, int bottom);
void far _Cdecl restorecrtmode(void);
void far _Cdecl sector( int X, int Y, int StAngle, int EndAngle,
int XRadius, int YRadius );
void far _Cdecl setactivepage(int page);
void far _Cdecl setallpalette(struct palettetype far *palette);
void far _Cdecl setaspectratio( int xasp, int yasp );
void far _Cdecl setbkcolor(int color);
void far _Cdecl setcolor(int color);
void far _Cdecl setfillpattern(char far *upattern, int color);
void far _Cdecl setfillstyle(int pattern, int color);
unsigned far _Cdecl setgraphbufsize(unsigned bufsize);
void far _Cdecl setgraphmode(int mode);
void far _Cdecl setlinestyle(int linestyle, unsigned upattern,
int thickness);
void far _Cdecl setpalette(int colornum, int color);
void far _Cdecl setrgbpalette(int colornum,
int red, int green, int blue);
void far _Cdecl settextjustify(int horiz, int vert);
void far _Cdecl settextstyle(int font, int direction, int charsize);
void far _Cdecl setusercharsize(int multx, int divx,
int multy, int divy);
void far _Cdecl setviewport(int left, int top, int right, int bottom,
int clip);
void far _Cdecl setvisualpage(int page);
void far _Cdecl setwritemode( int mode );
int far _Cdecl textheight(char far *textstring);
int far _Cdecl textwidth(char far *textstring);

/***** graphics drivers *****/

int _Cdecl registerbgidriver(void (*driver)(void));
int far _Cdecl registerfarbgidriver(void far *driver);

/* !! These "functions" are NOT user-callable !! */
/* !! They are there just so you can link in graphics drivers !! */

void _Cdecl CGA_driver(void);
void _Cdecl EGAVGA_driver(void);
void _Cdecl IBM8514_driver(void);
void _Cdecl Herc_driver(void);
void _Cdecl ATT_driver(void);
void _Cdecl PC3270_driver(void);

extern int far _Cdecl CGA_driver_far[];
extern int far _Cdecl EGAVGA_driver_far[];
extern int far _Cdecl IBM8514_driver_far[];
extern int far _Cdecl Herc_driver_far[];
extern int far _Cdecl ATT_driver_far[];
extern int far _Cdecl PC3270_driver_far[];

/***** graphics fonts *****/

int _Cdecl registerbgifont(void (*font)(void));
int far _Cdecl registerfarbgifont(void far *font);

/* !! These "functions" are NOT user-callable, !! */
/* !! they are there just so you can link in fonts !! */

void _Cdecl triplex_font(void);
void _Cdecl small_font(void);
void _Cdecl sansserif_font(void);
void _Cdecl gothic_font(void);

extern int far _Cdecl triplex_font_far[];
extern int far _Cdecl small_font_far[];
extern int far _Cdecl sansserif_font_far[];
extern int far _Cdecl gothic_font_far[];

#endif


[此贴子已经被作者于2007-1-3 17:07:05编辑过]

注意:以上文件需要有LIB库(GRAPHICS.LIB)支持才可以正常编译运行