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/*
Add text labels to a PPM image
by John Walker -- kelvin@fourmilab.ch
WWW home page: http://www.fourmilab.ch/
June 1995
*/
#define _XOPEN_SOURCE 500 /* get M_PI in math.h */
#include <math.h>
#include <string.h>
#include "pm_c_util.h"
#include "ppm.h"
#include "ppmdraw.h"
#define dtr(x) (((x) * M_PI) / 180.0)
static int argn, rows, cols, x, y, size, angle, transparent;
static pixel **pixels;
static pixval maxval;
static pixel rgbcolor, backcolor;
/* DRAWTEXT -- Draw text at current location and advance to
start of next line. */
static void
drawtext(const char * const text) {
if (!transparent && strlen(text) > 0) {
struct fillobj * handle;
int left, top, right, bottom;
int lx, ly;
int p1x, p1y, p2x, p2y, p3x, p3y, p4x, p4y;
double sina, cosa;
handle = ppmd_fill_create();
ppmd_text_box(size, 0, text, &left, &top, &right, &bottom);
/* Displacement vector */
lx = right;
ly = -(top - bottom);
/* Sine and cosine */
sina = sin(dtr(angle));
cosa = cos(dtr(angle));
/* Rotated extent box corners */
p1x = (int) ((x + left * cosa + bottom * sina) + 0.5);
p1y = (int) ((y + bottom * cosa + -left * sina) + 0.5);
#define WERF ppmd_fill_drawproc, handle
p2x = (int) (p1x - sina * ly + 0.5);
p2y = (int) ((p1y - cosa * ly) + 0.5);
p3x = (int) (p1x + cosa * lx + -sina * ly + 0.5);
p3y = (int) ((p1y - (cosa * ly + sina * lx)) + 0.5);
p4x = (int) (p1x + cosa * lx + 0.5);
p4y = (int) ((p1y - sina * lx) + 0.5);
ppmd_line(pixels, cols, rows, maxval,
p1x, p1y, p2x, p2y,
WERF);
ppmd_line(pixels, cols, rows, maxval,
p2x, p2y, p3x, p3y,
WERF);
ppmd_line(pixels, cols, rows, maxval,
p3x, p3y, p4x, p4y,
WERF);
ppmd_line(pixels, cols, rows, maxval,
p4x, p4y, p1x, p1y,
WERF);
ppmd_fill(pixels, cols, rows, maxval,
handle, PPMD_NULLDRAWPROC, (char *) &backcolor);
ppmd_fill_destroy(handle);
}
ppmd_text(pixels, cols, rows, maxval,
x, y, size, angle, text,
PPMD_NULLDRAWPROC, (char *) &rgbcolor);
/* For convenience, simulate a carriage return to the next line.
This allows multiple "-text" specifications or multiple lines
in a -file input to write consecutive lines of text in a
generally reasonable fashion.
*/
x += (int) ((cos(dtr(angle + 270)) * size * 1.75) + 0.5);
y -= (int) ((sin(dtr(angle + 270)) * size * 1.75) + 0.5);
}
int
main(int argc, char *argv[]) {
FILE *ifP;
/* Process standard command line arguments */
ppm_init(&argc, argv);
argn = 1;
/* Check for explicit input file specification, Note that
we count on the fact that every command line switch
takes a single argument. If this becomes untrue due
to a change in the future, you'll have to make this
test smarter.
*/
if ((argn != argc) && (argc == 2 || argv[argc - 2][0] != '-')) {
ifP = pm_openr(argv[argc - 1]);
argc--;
} else
ifP = stdin;
/* Load input image */
pixels = ppm_readppm(ifP, &cols, &rows, &maxval);
pm_close(ifP);
/* Set initial defaults */
x = 0;
y = rows / 2;
size = 12;
angle = 0;
PPM_ASSIGN(rgbcolor, maxval, maxval, maxval);
PPM_ASSIGN(backcolor, 0, 0, 0);
transparent = TRUE;
while (argn < argc && argv[argn][0] == '-' && argv[argn][1] != '\0') {
if (pm_keymatch(argv[argn], "-angle", 1)) {
argn++;
if ((argn == argc) || (sscanf(argv[argn], "%d", &angle) != 1))
pm_error("-angle doesn't have a value");
} else if (pm_keymatch(argv[argn], "-background", 1)) {
argn++;
if (strcmp(argv[argn], "transparent") == 0) {
transparent = TRUE;
} else {
transparent = FALSE;
backcolor = ppm_parsecolor(argv[argn], maxval);
}
} else if (pm_keymatch(argv[argn], "-color", 1)
|| pm_keymatch(argv[argn], "-colour", 1)) {
argn++;
rgbcolor = ppm_parsecolor(argv[argn], maxval);
} else if (pm_keymatch(argv[argn], "-file", 1)) {
char s[512];
argn++;
ifP = pm_openr(argv[argn]);
while (fgets(s, sizeof s, ifP) != NULL) {
while (s[0] != 0 && s[strlen(s) - 1] < ' ') {
s[strlen(s) - 1] = 0;
}
drawtext(s);
}
pm_close(ifP);
} else if (pm_keymatch(argv[argn], "-size", 1)) {
argn++;
if ((argn == argc) || (sscanf(argv[argn], "%d", &size) != 1))
pm_error("-size doesn't have a value");
} else if (pm_keymatch(argv[argn], "-text", 1)) {
argn++;
drawtext(argv[argn]);
} else if (pm_keymatch(argv[argn], "-u", 1)) {
pm_error("-u doesn't have a value");
} else if (pm_keymatch(argv[argn], "-x", 1)) {
argn++;
if ((argn == argc) || (sscanf(argv[argn], "%d", &x) != 1))
pm_error("-x doesn't have a value");
} else if (pm_keymatch(argv[argn], "-y", 1)) {
argn++;
if ((argn == argc) || (sscanf(argv[argn], "%d", &y) != 1))
pm_error("-y doesn't have a value");
} else
pm_error("Unrecognized option: '%s'", argv[argn]);
argn++;
}
if (argn != argc)
pm_error("Extraneous arguments");
ppm_writeppm(stdout, pixels, cols, rows, maxval, 0);
ppm_freearray(pixels, rows);
return 0;
}
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