graphic.part3.h

C语言库函数介绍

@函数名称:     getbkcolor
函数原型:     int fat getbkcolor(void)
函数功能:     得到当前背景颜色
函数返回:     颜色值含义如下:
		0-BLACK        黑     深色0-7
		1-BLUE         兰
		2-GREEN        绿
		3-CYAN         青
		4-RED          红
		5-MAGENTA      洋红
		6-BROWN        棕
		7-LIGHTGRAY    淡灰
		8-DARKGRAY     深灰    淡色8-15 
		9-LIGHTBLUE    淡兰 
		10-LIGHTGREEN  淡绿 
		11-LIGHTCYAN   淡青
		12-LIGHTRED    淡红
		13-LIGHTMAGENTA 淡洋红
		14-YELLOW      黄
		15-WHITE       白
参数说明:
所属文件:     <graphics.h>

#include <graphics.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <conio.h>
int main()
{
    int gdriver=DETECT,gmode,errorcode;
    int bkcolor,midx,midy;
    char bkname[35];
    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());
    settextjustify(CENTER_TEXT,CENTER_TEXT);
    bkcolor=getbkcolor();
    itoa(bkcolor,bkname,10);
    strcat(bkname,"is the current background color.");
    outtextxy(midx,midy,bkname);
    getch();
    closegraph();
    return 0;
}


@函数名称:     setbkcolor
函数原型:     void far setbkcolor(int color)
函数功能:     设置背景颜色
函数返回:
参数说明:
所属文件:     <graphics.h>

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
int main()
{
    int gdriver=EGA,gmode=EGAHI,errorcode;
    int bkcol,maxcolor,x,y;
    char msg[80];
    initgraph(&gdriver,&gmode,);
    errorcode=graphresult();
    if (errorcode!=grOk)
    {
        printf("Graphics error: %s",grapherrormsg(errorcode));
        printf("Press any key to halt:");
        getch();
        exit(1);
    }
    maxcolor=getmaxcolor();
    settextjustify(CENTER_TEXT,CENTER_TEXT);
    x=getmaxx()/2;
    y=getmaxy()/2;
    for (bkcol=0;bkcol<=maxcolor;bkcol++)
    {
        cleardevice();
        setbkcolor(bkcol);
        if (bkcol==WHITE)
            setcolor(EGA_BLUE);
        sprintf(msg,"Background color: %d",bkcol);
        outtextxy(x,y,msg);
        getch();
    }
    closegraph();
    return 0;
}


@函数名称:     getmaxcolor
函数原型:     int far getmaxcolor(void)
函数功能:     得到当前图形模式下的最大有效颜色数值，例如VGA为15
函数返回:     最大颜色数值
参数说明:
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;
    char colstr[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;
    sprintf(colstr,"This mode supports colors 0..%d",getmaxcolor());
    settextjustify(CENTER_TEXT,CENTER_TEXT);
    outtextxy(midx,midy,colstr);
    getch();
    closegraph();
    return 0;
}


@函数名称:     getpalette
函数原型:     void far getpalette(struct palettetype far *palette)
函数功能:     得到当前图形模式的调色板信息
函数返回:
参数说明:
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 palettetype pal;
   char psize[80], pval[20];
   int i, ht;
   int y=10;

   initgraph(&gdriver,&gmode,"");

   errorcode=graphresult();
   if(errorcode!=grOk){
      printf("Graphics error: %s\n",grapherrormsg(errorcode));
      printf("Press any key to halt:");
      getch();
      exit(1);
   }
   /* grab a copy of the palette */
   getpalette(&pal);
   /* convert palette info into strings */
   sprintf(psize,"The palette has %d modifiable entries.",pal.size);
   /* display the information */
   outtextxy(0,y,psize);
   if (pal.size!=0){
      ht=textheight("W");
      y+=2*ht;
      outtextxy(0,y,"Here are the current values:");
      y+=2*ht;
      for(i=0;i<pal.size;i++,y+=ht){
         sprintf(pval,"palette[%02d]: 0x%02X",i,pal.colors[i]);
         outtextxy(0,y,pval);
      }
   }
   getch();
   closegraph();
   return 0;
}


@函数名称:     setallpalette
函数原型:     void far setallpalette(struct palettetype far *palette)
函数功能:     设置EGA/VGA图形系统调色板的所有颜色数值
函数返回:
参数说明:     palette 新的调色板颜色数据，该结构如下：
		struct palettetype{
 		   unsigned char size;
 		   signed char colors[15];
		};

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 palettetype pal;
    int color,maxcolor,ht;
    int y=10;
    char msg[80];
    initgraph(&gdriver,&gmode,);
    errorcode=graphresult();
    if (errorcode!=grOk)
    {
        printf("Graphics error: %s",grapherrormsg(errorcode));
        printf("Press any key to halt:");
        getch();
        exit(1);
    }
    maxcolor=getmaxcolor();
    ht=2*textheight("W");
    getpalette(&pal);
    for (color=1;color<=maxcolor;color++)
    {
        setcolor(color);
        sprintf(msg,"Color: %d",color);
        outtextxy(1,y,msg);
        y+=ht;
    }
    getch();
    for (color=1;color<=maxcolor;color++)
    {
        setpalette(color,BLACK);
        getch();
    }
    setallpalette(&pal);
    getch();
    closegraph();
    return 0;
}


@函数名称:     setpalette
函数原型:     void far setpalette(int colorindex, int color)
函数功能:     设置EGA/VGA图形系统调色板的单个颜色数值
函数返回:
参数说明:     colorindex 调色板索引，VGA-16色为0－15，color-颜色值
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 color,maxcolor,ht;
    int y=10;
    char msg[80];
    initgraph(&gdriver,&gmode,);
    errorcode=graphresult();
    if (errorcode!=grOk)
    {
        printf("Graphics error: %s",grapherrormsg(errorcode));
        printf("Press any key to halt:");
        getch();
        exit(1);
    }
        maxcolor=getmaxcolor();
        ht=2*textheight("W");
    for (color=1;color<=maxcolor;color++)
    {
        setcolor(color);
        sprintf(msg,"Color: %d",color);
        outtextxy(1,y,msg);
        y+=ht;
    }
    getch();
    for (color=1;color<=maxcolor;color++)
    {
        setpalette(color,BLACK);
        getch();
    }
    closegraph();
    return 0;
}


@函数名称:     closegraph
函数原型:     void far closegraph(void)
函数功能:     关闭图形工作方式
函数返回:
参数说明:
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 x,y;
    initgraph(&gdriver,&gmode,);
    errorcode=graphresult();
    if (errorcode!=grOk)
    {
        printf("Graphics error: %s",grapherrormsg(errorcode));
        printf("Press any key to halt:");
        getch();
        exit(1);
    }
    x=getmaxx()/2;
    y=getmaxy()/2;
    settextjustify(CENTER_TEXT,CENTER_TEXT);
    outtextxy(x,y,"Press a key to close the graphics system:");
    getch();
    closegraph();
    printf("We're now back in text mode.");
    printf("Press any key to halt:");
    getch();
    return 0;
}


@函数名称:     setgraphbufsize
函数原型:     unsigned far setgraphbufsize(unsigned bufsize)
函数功能:     设置图形缓冲区的大小
函数返回:     返回图形内存的指针
参数说明:     size-图形缓冲区的大小
所属文件:     <graphics.h>

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

#define BUFSIZE 1000 /* internal graphics buffer size */

int main()
{
   /* request auto detection */
   int gdriver=DETECT,gmode,errorcode;
   int x,y,oldsize;
   char msg[80];

   /* set the size of the internal graphics buffer */
   /* before making a call to initgraph.           */
   oldsize=setgraphbufsize(BUFSIZE);

   /* initialize graphics and local variables */
   initgraph(&gdriver,&gmode,"");

   /* read result of initialization */
   errorcode=graphresult();
   if(errorcode != grOk)
   {
      printf("Graphics error: %s\n",grapherrormsg(errorcode));
      printf("Press any key to halt:");
      getch();
      exit(1);
   }

   x=getmaxx()/2;
   y=getmaxy()/2;

   /* output some messages */
   sprintf(msg,"Graphics buffer size: %d",BUFSIZE);
   settextjustify(CENTER_TEXT,CENTER_TEXT);
   outtextxy(x,y,msg);
   sprintf(msg,"Old graphics buffer size: %d",oldsize);
   outtextxy(x,y+textheight("a"),msg);

   getch();
   closegraph();
   return 0;
}


@函数名称:     detectgraph
函数原型:     void far detectgraph(int far *driver, int far *mode)
函数功能:     检测计算机图形适配器的类型和工作模式
函数返回:
参数说明:     driver-适配器类型，mode-适配器工作模式
所属文件:     <graphics.h>

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
char *dname[]={"requests detection","a CGA","an MCGA","an EGA",
        "a 64K EGA","a monochrome EGA","an IBM 8514",
        "a Hercules monochrome","an AT&T 6300 PC","a VGA",
        "an IBM 3270 PC"};
int main()
{
    int gdriver,gmode,errorcode;
    detectgraph(&gdriver,&gmode);
    errorcode=graphresult();
    if (errorcode!=grOk)