C语言gd库画图

来源：互联网发布：常用设计模式 java 编辑：程序博客网时间：2024/05/19 09:47

cgi中使用gd创建图片并且显示到网页上：

    gdImagePtr im;    int back,border,blue;    int xsize,ysize;    char str[5];    int size;    char* ptr;    xsize = 60;    ysize = 20;    sprintf(str,"%04d",1234);    im = gdImageCreate(xsize,ysize);    back = gdImageColorAllocate(im,255,255,255);    border = gdImageColorAllocate(im, 0,0,0);    blue = gdImageColorAllocate(im,30,130,211);    gdImageFilledRectangle(im,0,0,xsize - 1,ysize - 1,back);    gdImageRectangle(im,0,0,xsize - 1,ysize - 1,border);    gdImageString(im, gdFontGetLarge(),                  im->sx / 2 - (strlen(str) * gdFontGetLarge()->w / 2),                  im->sy / 2 - gdFontGetLarge()->h / 2,                  (unsigned char*)str, blue);    //print html HEAD    printf("Content-type: image/png\n\n");    //write content    ptr = gdImagePngPtr(im, &size);    fwrite(ptr,size,1,stdout);    gdFree(ptr);    /* Destroy it */    gdImageDestroy(im);