graphic.part3.h

C语言库函数介绍

    {
        printf("Graphics error: %s",grapherrormsg(errorcode));
        printf("Press any key to halt:");
        getch();
        exit(1);
    }
    clrscr();
    printf("You have %s video display card.",dname[gdriver]);
    printf("Press any key to halt:");
    getch();
    return 0;
}


@函数名称:     drawpoly
函数原型:     void far drawpoly(int numpoint, int far *points)
函数功能:     画多边形
函数返回:
参数说明:     numpoint-多边形点数,points-保存多边形顶点坐标的数组（x1,y1,x2,y2顺序）
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 maxx,maxy;
    int poly[10];
    initgraph(&gdriver,&gmode,);
    errorcode=graphresult();
    if (errorcode!=grOk)
    {
        printf("Graphics error: %s",grapherrormsg(errorcode));
        printf("Press any key to halt:");
        getch();
        exit(1);
    }
    maxx=getmaxx();
    maxy=getmaxy();
    poly[0]=20;
    poly[1]=maxy/2;
    poly[2]=maxx-20;
    poly[3]=20;
    poly[4]=maxx-50;
    poly[5]=maxy-20;
    poly[6]=maxx/2;
    poly[7]=maxy/2;
    poly[8]=poly[0];
    poly[9]=poly[1];
    drawpoly(5,poly);
    getch();
    closegraph();
    return 0;
}


@函数名称:     fillpoly
函数原型:     void far fillpoly(int numpoints, int far *points)
函数功能:     按当前设置的填充模式和颜色填充多边形
函数返回:
参数说明:     numpoints-多边形点数，points-多边形坐标数组
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 i,maxx,maxy;
    int poly[8];
    initgraph(&gdriver,&gmode,);
    errorcode=graphresult();
    if (errorcode!=grOk)
    {
        printf("Graphics error: %s",grapherrormsg(errorcode));
        printf("Press any key to halt:");
        getch();
        exit(1);
    }
    maxx=getmaxx();
    maxy=getmaxy();
    poly[0]=20;
    poly[1]=maxy/2;
    poly[2]=maxx-20;
    poly[3]=20;
    poly[4]=maxx-50;
    poly[5]=maxy-20;
    poly[6]=maxx/2;
    poly[7]=maxy/2;
    for (i=EMPTY_FILL;i<USER_FILL;i++)
    {
        setfillstyle(i,getmaxcolor());
        fillpoly(4,poly);
        getch();
    }
    closegraph();
    return 0;
}


@函数名称:     floodfill
函数原型:     void far floodfill(int x, int y, int border)
函数功能:     填充一个有边界的区域
函数返回:
参数说明:     x,y-要填充区域内的任意一点坐标,border-填充区域边界的颜色.
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 maxx,maxy;
    initgraph(&gdriver,&gmode,);
    errorcode=graphresult();
    if (errorcode!=grOk)
    {
        printf("Graphics error: %s",grapherrormsg(errorcode));
        printf("Press any key to halt:");
        getch();
        exit(1);
    }
    maxx=getmaxx();
    maxy=getmaxy();
    setcolor(getmaxcolor());
    setfillstyle(SOLID_FILL,getmaxcolor());
    rectangle(0,0,maxx,maxy);
    circle(maxx/3,maxy /2,50);
    circle(maxx/2,20,100);
    circle(maxx-20,maxy-50,75);
    circle(20,maxy-20,25);
    getch();
    floodfill(2,2,getmaxcolor());
    getch();
    closegraph();
    return 0;
}


@函数名称:     getgraphmode
函数原型:     int far getgraphmode(void)
函数功能:     得到当前图形模式
函数返回:     图形模式数值，含义如下：
		CGAC0=0   320x200  palette 0 1 page 
    	        CGAC1=1   320x200  palette 1 1 page
		CGAC2=2   320x200  palette 2 1 pag
		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
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,mode;
    char numname[80],modename[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;
    mode=getgraphmode();
    sprintf(numname,"%d is the current mode number.",mode);
    sprintf(modename,"%s is the current graphics mode",getmodename(mode));
    settextjustify(CENTER_TEXT,CENTER_TEXT);
    outtextxy(midx,midy,numname);
    outtextxy(midx,midy+2*textheight("W"),modename);
    getch();
    closegraph();
    return 0;
}


@函数名称:     setgraphmode
函数原型:     void far setgraphmode(int mode)
函数功能:     设置图形工作模式
函数返回:
参数说明:     图形模式数值
所属文件:     <graphics.h>

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
#define BUFSIZE 100
int main()
{
    int gdriver=DETECT,gmode,errorcode;
    int x,y,oldsize;
    char msg[80];
    oldsize=setgraphbufsize(BUFSIZE);
    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;
    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("W"),msg);
    getch();
    closegraph();
    return 0;
}


@函数名称:     getimage
函数原型:     void far getimage(int left,int top,int right,int bottom,void far *bitmap)
函数功能:     保存矩形图形屏幕的内容到bitmap缓冲区
函数返回:
参数说明:     Left,Top,Right,bottom-矩形屏幕坐标
所属文件:     <graphics.h>

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

void save_screen(void far *buf[4]);
void restore_screen(void far *buf[4]);

int maxx,maxy;

int main()
{
    int gdriver=DETECT,gmode,errorcode;
    void far *ptr[4];

    /* auto-detect the graphics driver and mode */
    initgraph(&gdriver,&gmode,"");
    errorcode=graphresult(); /* check for any errors */
    if(errorcode!=grOk)
    {
       printf("Graphics error: %s\n",grapherrormsg(errorcode));
       printf("Press any key to halt:");
       getch();
       exit(1);
    }
    maxx=getmaxx();
    maxy=getmaxy();

    /* draw an image on the screen */
    rectangle(0,0,maxx,maxy);
    line(0,0,maxx,maxy);
    line(0,maxy,maxx,0);

    save_screen(ptr);    /* save the current screen */
    getch();             /* pause screen */
    cleardevice();       /* clear screen */
    restore_screen(ptr); /* restore the screen */
    getch();             /* pause screen */

    closegraph();
   return 0;
}

void save_screen(void far *buf[4])
{
    unsigned size;
    int ystart=0,yend,yincr,block;

    yincr=(maxy+1)/4;
    yend=yincr;
    size=imagesize(0,ystart,maxx,yend);

    for (block=0;block<=3;block++)
    {
       if((buf[block]=farmalloc(size))==NULL)
       {
          closegraph();
          printf("Error: not enough heap space in save_screen().\n");
          exit(1);
       }

       getimage(0,ystart,maxx,yend,buf[block]);
       ystart=yend+1;
       yend+=yincr+1;
    }
}

void restore_screen(void far *buf[4])
{
    int ystart=0,yend,yincr,block;

    yincr=(maxy+1)/4;
    yend=yincr;

    for(block=0;block<=3;block++)
    {
       putimage(0,ystart,buf[block],COPY_PUT);
       farfree(buf[block]);
       ystart=yend+1;
       yend+=yincr+1;
    }
}


@函数名称:     putimage
函数原型:     void far putimage(int left, int top, void far *bitmap, int op)
函数功能:     将先前存储的屏幕图象恢复到屏幕上 
函数返回:
参数说明:     left,top-恢复的位置，bitmap-存储的图象位图缓存
		top 恢复模式，取值为以下5个数值：
		COPY_PUT 完全拷贝
		XOR_PUT  与现在的屏幕图象异或拷贝
		OR_PUT   与现在的屏幕图象相或拷贝
		AND_PUT  与现在的屏幕图象相与拷贝
		NOT_PUT  取反拷贝到屏幕上
所属文件:     <graphics.h>

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
#define ARROW_SIZE 10
void draw_arrow(int x,int y);
int main()
{
    int gdriver=DETECT,gmode,errorcode;
    void *arrow;
    int x,y,maxx;
    unsigned int size;
    initgraph(&gdriver,&gmode,);
    errorcode=graphresult();
    if (errorcode!=grOk)
    {
        printf("Graphics error: %s",grapherrormsg(errorcode));
        printf("Press any key to halt:");
        getch();
        exit(1);
    }
    maxx=getmaxx();
    x=0;
    y=getmaxy()/2;
    draw_arrow(x,y);
    size=imagesize(x,y-ARROW_SIZE,x+(4*ARROW_SIZE),y+ARROW_SIZE);
    arrow=malloc(size);
    getimage(x,y-ARROW_SIZE,x+(4*ARROW_SIZE),y+ARROW_SIZE,arrow);
    while (!kbhit())
    {
        putimage(x,y-ARROW_SIZE,arrow,XOR_PUT);
        x +=ARROW_SIZE;
        if (x>=maxx)x=0;
        putimage(x,y-ARROW_SIZE,arrow,XOR_PUT);
    }
    free(arrow);
    closegraph();
    return 0;
}