graphic.h

C语言库函数介绍

@函数名称:     getarccoords
函数原型:     void far getarccoords(struct arccoordstype far *coords)
函数功能:     得到最后一次画圆弧的坐标
函数返回:
参数说明:     coords-使用函数arc()画圆弧的坐标，该结构如下:
              struct arccoordstype{
                 int m,n;  /* 圆心坐标 */
                 int xstart,ysrart,xend,yend;/* 圆弧起点终点坐标 */ 
              };
所属文件:     <graphics.h>

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
int main()
{
    int gdriver=DETECT,gmode,errorcode;
    struct arccoordstype arcinfo;
    int midx,midy;
    int stangle=45,endangle=270;
    char sstr[80],estr[80];
    initgraph(&gdriver,&gmode,);
    errorcode=graphresult();
    if (errorcode!=grOk)
    {
        printf("Graphics error: %s",grapherrormsg(errorcode));
        printf("Press any key to halt:");
        getch();
        exit(1);
    }
    midx=getmaxx()/2;
    midy=getmaxy()/2;
    setcolor(getmaxcolor());
    arc(midx,midy,stangle,endangle,100);
    getarccoords(&arcinfo);
    sprintf(sstr,"*- (%d,%d)",arcinfo.xstart,arcinfo.ystart);
    sprintf(estr,"*- (%d,%d)",arcinfo.xend,arcinfo.yend);
    outtextxy(arcinfo.xstart,arcinfo.ystart,sstr);
    outtextxy(arcinfo.xend,arcinfo.yend,estr);
    getch();
    closegraph();
    return 0;
}


@函数名称:     arc
函数原型:     void far arc(int x, int y, int start, int end, int radius)
函数功能:     画一圆弧线
函数返回:
参数说明:     x,y-圆心,radius-半径,start,end-弧线的起始和中止角度
所属文件:     <graphics.h>

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
int main()
{
    int gdriver=DETECT,gmode,errorcode;
    int midx,midy;
    int stangle=45,endangle=135;
    int radius=100;
    initgraph(&gdriver,&gmode,);
    errorcode=graphresult();
    if (errorcode!=grOk)
    {
        printf("Graphics error: %s",grapherrormsg(errorcode));
        printf("Press any key to halt:");
        getch();
        exit(1);
    }
    midx=getmaxx()/2;
    midy=getmaxy()/2;
    setcolor(getmaxcolor());
    arc(midx,midy,stangle,endangle,radius);
    getch();
    closegraph();
    return 0;
}


@函数名称:     circle
函数原型:     void far circle(int x, int y, int radius)
函数功能:     画圆
函数返回:
参数说明:     x,y-圆心坐标，radius-半径
所属文件:     <graphics.h>

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
int main()
{
    int gdriver=DETECT,gmode,errorcode;
    int midx,midy;
    int radius=100;
    initgraph(&gdriver,&gmode,);
    errorcode=graphresult();
    if (errorcode!=grOk)
    {
        printf("Graphics error: %s",grapherrormsg(errorcode));
        printf("Press any key to halt:");
        getch();
        exit(1);
    }
    midx=getmaxx()/2;
    midy=getmaxy()/2;
    setcolor(getmaxcolor());
    circle(midx,midy,radius);
    getch();
    closegraph();
    return 0;
}


@函数名称:     pieslice
函数原型:     void far pieslice(int x,int y,int start,int end,int radius)
函数功能:     画扇形 
函数返回:
参数说明:     x,y-扇形所在园的圆心坐标,start,end-扇形的开始和结束角度，radius-园的半径
所属文件:     <graphics.h>

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
int main()
{
    int gdriver=DETECT,gmode,errorcode;
    int midx,midy;
    int stangle=45,endangle=135,radius=100;
    initgraph(&gdriver,&gmode,);
    errorcode=graphresult();
    if (errorcode!=grOk)
    {
        printf("Graphics error: %s",grapherrormsg(errorcode));
        printf("Press any key to halt:");
        getch();
        exit(1);
    }
    midx=getmaxx()/2;
    midy=getmaxy()/2;
    setfillstyle(EMPTY_FILL,getmaxcolor());
    pieslice(midx,midy,stangle,endangle,radius);
    getch();
    closegraph();
    return 0;
}


@函数名称:     getaspectratio,setaspectratio
函数原型:     void far getaspectratio(int far *xasp, int far *yasp)
函数功能:     得到图形显示的比例因子
函数返回:
参数说明:     xasp-x方向比例因子，yasp-y方向比例因子
所属文件:     <graphics.h>

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
int main()
{
    int gdriver=DETECT,gmode,errorcode;
    int xasp,yasp,midx,midy;
    initgraph(&gdriver,&gmode,);
    errorcode=graphresult();
    if (errorcode!=grOk)
    {
        printf("Graphics error: %s",grapherrormsg(errorcode));
        printf("Press any key to halt:");
    getch();
    exit(1);
    }
    midx=getmaxx()/2;
    midy=getmaxy()/2;
    setcolor(getmaxcolor());
    getaspectratio(&xasp,&yasp);
    circle(midx,midy,100);
    getch();
    cleardevice();
    setaspectratio(xasp/2,yasp);
    circle(midx,midy,100);
    getch();
    cleardevice();
    setaspectratio(xasp,yasp/2);
    circle(midx,midy,100);
    getch();
    closegraph();
    return 0;
}


@函数名称:    sector
函数原型:     void far sector(int x,int y,int start,int end,int xrad,int yrad)
函数功能:     画扇形，并填充以预定填充图案和颜色
函数返回:
参数说明:     x,y-圆心坐标，start,end-圆弧起点和终点角度，单位度,xrad,yrad-椭圆x,y方向的半径
所属文件:     <graphics.h>

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>

int main(void)
{
    /* request auto detection */
    int gdriver=DETECT,gmode,errorcode;
    int midx,midy,i;
    int stangle=45,endangle=135;
    int xrad=100, yrad=50;
    /* initialize graphics and local variables */
    initgraph(&gdriver,&gmode,"");
    /* read result of initialization */
    errorcode=graphresult();
    if (errorcode!=grOk)  /* an error occurred */
    {
       printf("Graphics error: %s\n",grapherrormsg(errorcode));
       printf("Press any key to halt:");
       getch();
       exit(1); /* terminate with an error code */
    }
    midx=getmaxx()/2;
    midy=getmaxy()/2;
    /* loop through the fill patterns */
    for(i=EMPTY_FILL;i<USER_FILL;i++)
    {
       /* set the fill style */
       setfillstyle(i,getmaxcolor());
       /* draw the sector slice */
       sector(midx,midy,stangle,endangle,xrad,yrad);
       getch();
    }
    /* clean up */
    closegraph();
    return 0;
}


@函数名称:     ellipse
函数原型:     void far ellipse(int x,int y,int start,int end,int xradius,int yradius)
函数功能:     画椭圆弧
函数返回:
参数说明:     x,y-圆心坐标，start,end-圆弧起点和终点角度，单位为度,xradius,yradius-椭圆x,y方向的半径
所属文件:     <graphics.h>

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
int main()
{
    int gdriver=DETECT,gmode,errorcode;
    int midx,midy;
    int stangle=0,endangle=360;
    int xradius=100,yradius=50;
    initgraph(&gdriver,&gmode,);
    errorcode=graphresult();
    if (errorcode!=grOk)
    {
        printf("Graphics error: %s",grapherrormsg(errorcode));
        printf("Press any key to halt:");
        getch();
        exit(1);
    }
    midx=getmaxx()/2;
    midy=getmaxy()/2;
    setcolor(getmaxcolor());
    ellipse(midx,midy,stangle,endangle,xradius,yradius);
    getch();
    closegraph();
    return 0;
}


@函数名称:     fillellipse
函数原型:     void far fillellipse(int x, int y, int xradius, int yradius)
函数功能:     画椭圆并用当前的填充色和填充图案填充
函数返回:
参数说明:     x,y-圆心坐标,xradius,yradius-椭圆x,y方向的半径
所属文件:     <graphics.h>

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>

int main()
{
   int gdriver=DETECT,gmode,errorcode;
   int midx,midy,i;
   int xradius=100,yradius=50;
   initgraph(&gdriver,&gmode,"");
   errorcode=graphresult();
   if (errorcode!=grOk){
     printf("Graphics error: %s\n",grapherrormsg(errorcode));
     printf("Press any key to halt:");
     getch();
     exit(1);
   }
   midx=getmaxx()/2;
   midy=getmaxy()/2;
   /* loop through the fill patterns */
   for (i=EMPTY_FILL;i<USER_FILL;i++){
     /* set fill pattern */
     setfillstyle(i,getmaxcolor());
     fillellipse(midx,midy,xradius,yradius);
     getch();
   }
   closegraph();
   return 0;
}


@函数名称:     getfillsettings
函数原型:     void far getfillsettings(struct fillsettingstype far *info)
函数功能:     得到当前填充模式和颜色编号
函数返回:
参数说明:     info-当前填充模式和颜色编号，该结构定义如下：
		struct fillsettingstype{
 		   int patterns;
 		   int color;
		}
	      其中patterns定义如下：
		EMPTY_FILL     0背景色填充     SOLID_FILL      1实填充 
		LINE_FILL      2--- 线填充     LTSLASH_FILL    3斜线填充
		SLASH_FILL     4粗斜线填充     BKSLASH_FILL    5反粗斜线填充
		LTBKSLASH_FILL 6反斜线填充     HATCH_FILL      7网格填充
		XHATCH_FILL    8斜网格填充     INTERLEAVE_FILL 9间隔点线填充
		WIDE_DOT_FILL  10稀疏点填充    CLOSE_DOT_FILL  11密集点填充
		USER_FILL      12用户自定义填充
所属文件:     <graphics.h>

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
char *fname[]={"EMPTY_FILL","SOLID_FILL","LINE_FILL","LTSLASH_FILL","SLASH_FILL",
	"BKSLASH_FILL","LTBKSLASH_FILL","HATCH_FILL","XHATCH_FILL","INTERLEAVE_FILL",
	"WIDE_DOT_FILL","CLOSE_DOT_FILL","USER_FILL"};
int main()
{
    int gdriver=DETECT,gmode,errorcode;
    struct fillsettingstype fillinfo;
    int midx,midy;
    char patstr[40],colstr[40];
    initgraph(&gdriver,&gmode,);
    errorcode=graphresult();
    if (errorcode!=grOk)
    {
        printf("Graphics error: %s",grapherrormsg(errorcode));
        printf("Press any key to halt:");
        getch();
        exit(1);
    }
    midx=getmaxx()/2;
    midy=getmaxy()/2;
    getfillsettings(&fillinfo);
    sprintf(patstr,"%s is the fill style.",fname[fillinfo.pattern]);
    sprintf(colstr,"%d is the fill color.",fillinfo.color);
    settextjustify(CENTER_TEXT,CENTER_TEXT);
    outtextxy(midx,midy,patstr);
    outtextxy(midx,midy+2*textheight("W"),colstr);
    getch();
    closegraph();
    return 0;
}


@函数名称:     getfillpattern,setfillpattern
函数原型:     void far getfillpattern(char far *pattern)
              void far setfillpattern(char far *pattern,int color)
函数功能:     得到当前的填充模式／用户自定义填充
函数返回: