用C语言显示BMP图形.doc

用C语言显示BMP图形
#include "stdio.h"
#include "dir.h"
#include "dos.h"
#include "graphics.h"

char *malloc();/*malloc转换*/

char bmp_to_dat(char *bmp,char *dat)
/*将16色BMP文件转换为可以用putimage输出的格式，bmp为原BMP文件，dat为转化文件*/
{
    unsigned char c[8],scan_times,scan_pixs;
    unsigned char workpos;int i,j,k,n,nowpos,iw,ih;
    static int color[16]={0,4,2,6,1,5,3,7,8,12,10,14,9,13,11,15};
    unsigned char workline[640],scanline[640];
    FILE *fp,*targetfp;
    union
    {
        unsigned char value;
        struct
        {
            unsigned cl:4;
            unsigned ch:4;
        }color;
    }mycolor;

    if((fp=fopen(bmp,"rb"))==NULL)return(0);
    targetfp=fopen(dat,"wb");

    fseek(fp,18,SEEK_SET);
    iw=0;ih=0;
    fread(&iw,4,1,fp);        /*读图像宽度*/
    fread(&ih,4,1,fp);        /*读图像高度*/
    if(iw==0&&ih==0&&iw>640&&ih>480)
    {fclose(fp);fclose(targetfp);return(0);}

    iw--;ih--;            /*∵putimage中的长宽比实际数值少1*/
    scan_times=iw/8+1;        /*行处理单位数*/
    scan_pixs=scan_times*4;        /*行像素字节数∵1单位=4字节*/

    fputc(iw%256,targetfp);        /*填充信息头：长、宽部分*/
    fputc(iw/256,targetfp);
    fputc(ih%256,targetfp);
    fputc(ih/256,targetfp);
    fseek(fp,-scan_pixs,SEEK_END);

    for(j=0;j<=ih;j++)
    {nowpos=0;
    fread(scanline,scan_pixs,1,fp);
    fseek(fp,-scan_pixs*2,SEEK_CUR);
    for(n=3;n>=0;n--)        /*解码4个位面*/
    {for(i=0;i<scan_times;i++)    /*解码各编码单位*/
    {workpos=0;
    for(k=0;k<4;k++)        /*分离出8个像素*/
    {mycolor.value=scanline[i*4+k];
    c[k*2]=color[mycolor.color.ch];
    c[k*2+1]=color[mycolor.color.cl];
    }
    for(k=0;k<8;k++)workpos+=(c[k]>>n&1)<<(7-k);
    workline[nowpos]=workpos;nowpos++;
    }}
    fwrite(workline,scan_pixs,1,targetfp);
    }
    fclose(fp);fclose(targetfp);
    return(1);
}

main()
{
    int gd=VGA,gm=VGAHI,n;
    char *buffer,bmpfile[13],_16file[13]={0};
    FILE *fp;
    struct ffblk *ff;
    /*registerbgidriver(EGAVGA_driver);*/
    initgraph(&gd,&gm,"C:\\tc");
    printf("Now start to display 16 color bmp.\n\n");
    puts("Please choice: ");
    printf("0. Quit \n1. BMP file name\n");
    while(1)
    {
        n=getch();
        switch(n)
        {
        case 0  :continue;
        case '0':exit(0);
        case '1':
            {
                printf("Please input BMP file name(*.bmp):");
                gets(bmpfile);
                goto OUT;
            }OUT:
    strncpy(_16file,bmpfile,strlen(bmpfile)-3);
    strcat(_16file,"dat");
    if(!bmp_to_dat(bmpfile,_16file))
    {
        puts("Can't open file!");
        closegraph();
        exit(0);
    }
    fp=fopen(_16file,"rb");
    findfirst(_16file,ff,FA_ARCH);
    if((buffer=malloc(ff->ff_fsize))==NULL)exit(0);
    n=0;
    while(!feof(fp))
    {
        buffer[n]=fgetc(fp);
        n++;
    }
    for(n=0;n<100;n++)
    {
        putimage(350-n,n/2,buffer,COPY_PUT);
    }
    getch();
    closegraph();
    free(buffer);
    fclose(fp);
} C语言精彩作图之一颗三维的心
/* Heart */
#include <graphics.h>
#include <math.h>
#define PI 3.1415926
void main()
{
    double a;
    int x,y,y1,r,r1;
    int gdriver=DETECT,gmode;
    initgraph(&gdriver,&gmode,"c:\\tc");
    printf("Please input Radus(<80): ");
    scanf("%d",&r);
    cleardevice();
    setbkcolor(9);
    setcolor(4);
    outtextxy(80,20,"This program show the Heart picture.");

    y1=240-r;
    for(a=0;a<=2*PI;a+=PI/27)
    {         x=320+r*cos(a);
        y=240+r*sin(a);
        r1=sqrt((x-320)*(x-320)+(y-y1)*(y-y1));
        circle(x,y,r1);
    }
    outtextxy(80,460,"Press any key to quit...");
    getch();
    closegraph();
}
2