getfillpattern

Syntax

#include <graphics.h>
void getfillpattern(char *pattern);

Description

getfillpattern copies the user-defined fill pattern, as set by setfillpattern, into the 8-byte area pointed to by pattern.

pattern is a pointer to a sequence of 8 bytes, with each byte corresponding to 8 pixels in the pattern. Whenever a bit in a pattern byte is set to 1, the corresponding pixel will be plotted. For example, the following user-defined fill pattern represents a checkerboard:

char checkboard[8] = {
   0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55
};

Return Value

None.

See also

getfillsettings

setfillpattern

Example

/* getfillpattern example */ #include <graphics.h> #include <stdlib.h> #include <stdio.h> #include <conio.h> int main(void) { /* request autodetection */ int gdriver = DETECT, gmode, errorcode; int maxx, maxy; char pattern[8] = {0x00, 0x70, 0x20, 0x27, 0x25, 0x27, 0x04, 0x04}; /* 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 */ } maxx = getmaxx(); maxy = getmaxy(); setcolor(getmaxcolor()); /* select a user-defined fill pattern */ setfillpattern(pattern, getmaxcolor()); /* fill the screen with the pattern */ bar(0, 0, maxx, maxy); getch(); /* get the current user-defined fill pattern */ getfillpattern(pattern); /* alter the pattern we grabbed */ pattern[4] -= 1; pattern[5] -= 3; pattern[6] += 3; pattern[7] -= 4; /* select our new pattern */ setfillpattern(pattern, getmaxcolor()); /* fill the screen with the new pattern */ bar(0, 0, maxx, maxy); /* clean up */ getch(); closegraph(); return 0; }