Figure 11-3: What PADDY.C does in Java

Paint QR in Java Figure 11-3: What PADDY.C does
Figure 11-3: What PADDY.C does
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Subpads
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Just as windows can have subwindows, there is also a beast known as a subpad. Yeah, I m not thrilled about it. Like the subwindow, the subpad shares memory with the parent; changing the contents of a subpad changes the text on a pad.
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Making a subpad
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Almost without thinking, you can guess that the subpad() function creates a new subpad:
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subpad(org,rows,cols,y,x)
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org is the parent pad. rows and cols set the subpad s size, which (logically) must not be greater than the orig pad s size. y and x set the subpad s position relative to the parent, where 0,0 is the upper-left corner. If the subpad() call is successful, a subpad is created in memory and a pointer to a WINDOW structure is returned by subpad(). If NULL is returned, the subpad was not created. (See Listing 11-3.)
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Listing 11-3: sonofpad.c
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 #include <ncurses.h> #include <stdlib.h> void bomb(char *message); int main(void) { WINDOW *pod,*pea; initscr(); /* create a new pad */ pod = newpad(50,50); if( pod == NULL ) bomb( Unable to create new pad ); addstr( New pad created\n ); refresh(); /* create a subpad */ pea = subpad(pod,20,20,29,29);
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Listing 11-3 (continued)
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22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 if( pea == NULL ) bomb( Unable to create subpad ); addstr( Subpad created\n ); refresh(); getch(); endwin(); return 0; } void bomb(char *message) { addstr(message); refresh(); getch(); endwin(); exit(1); }
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First, the pad is created; if successful, you ll see:
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New pad created
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Then a subpad on that pad is created. If the stars are in proper alignment, you ll see:
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Subpad created
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Pop the cork on some bubbly.
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Working with a Subpad
As with subwindows, I feel that the best way to put a subpad to use is as a quick way to reference specific coordinates within a pad. So if something interesting is happening always at location 20,30 in the pad, consider placing a subpad there so you can use coordinates local to the subpad instead of having to calculate things in the pad. A perfect example of these local coordinates can be seen in the code for PADDY1.C. Rather than calculate offsets within the pad p, three subpads can be created, each of which represents one of the columns of text displayed on the screen (see Figure 11-2). This greatly helps to clean up the prefresh() statements near the end of the code, as this improvement in Listing 11-4 demonstrates.
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Listing 11-4: paddy2.c
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 #include <ncurses.h> #include <stdlib.h> #define #define #define #define FILENAME gettysburg.txt TALL 24 WIDE 19 SPACER 5
void bomb(char *message); int main(void) { WINDOW *p,*s1,*s2,*s3; FILE *f; int ch; initscr(); /* create a new pad */ p = newpad(200,WIDE+1); if( p == NULL ) bomb( Unable to create new pad\n ); /* create three subpads */ s1 = subpad(p,TALL,WIDE+1,0,0); if( s1 == NULL) bomb( Unable to create subpad 1\n ); s2 = subpad(p,TALL,WIDE+1,TALL,0); if( s2 == NULL) bomb( Unable to create subpad 2\n ); s3 = subpad(p,TALL,WIDE+1,2*TALL,0); if( s3 == NULL) bomb( Unable to create subpad 3\n ); /* open the file */ f = fopen(FILENAME, r ); if( f == NULL) bomb( Unable to open file\n ); /* display file s contents on the pad */ while( (ch=fgetc(f)) != EOF) waddch(p,ch); fclose(f); /* display the pad s contents on the screen */ prefresh(s1, 0, 0, 0, 0, TALL-1, WIDE); prefresh(s2, 0, 0, 0, WIDE+SPACER, TALL-1, WIDE*2+SPACER); prefresh(s3, 0, 0, 0, WIDE*2+SPACER*2, TALL-1, WIDE*3+SPACER*2); wgetch(p);