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/*
genclockimg
generates a clock face PNG image
*/
#include <cairo.h>
#include <popt.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <math.h>
int main (int argc, const char **argv)
{
/* configuration options */
int img_width;
int img_height;
char *img_filename;
char img_filename_default[] = "out.png\0";
char *timestr;
/* timestamp represeting what time to draw */
time_t clock_timestamp;
struct tm *clock_localtime;
int h;
int m;
/* cairo surface and context */
cairo_surface_t *surface;
cairo_t *context;
/* popt options table */
struct poptOption options_table[] = {
{"out", 'o', POPT_ARG_STRING, &img_filename, 0, "output filename", NULL },
{"width", 'w', POPT_ARG_INT, &img_width, 0, "output image width", NULL },
{"height", 'h', POPT_ARG_INT, &img_height, 0, "output image height", NULL },
{"hours", '\0', POPT_ARG_INT, &h, 0, "hour to display", NULL },
{"minutes", '\0', POPT_ARG_INT, &m, 0, "minutes to display", NULL },
{"time", 't', POPT_ARG_STRING, ×tr, 0, "time to display as HH:MM", NULL},
POPT_AUTOHELP
{NULL, '\0', 0, NULL, 0, NULL, NULL}
};
/* popt context */
poptContext options_context;
/* default filename is out.png */
img_filename = NULL;
timestr = NULL;
/* default image size is 128x128 */
img_width = 128;
img_height = 128;
/* default timestamp is current localtime */
clock_timestamp = time(NULL);
clock_localtime = localtime(&clock_timestamp);
h = clock_localtime->tm_hour % 12;
m = clock_localtime->tm_min;
/* parse command line options */
options_context = poptGetContext(NULL, argc, argv, options_table, 0);
int result;
while ((result = poptGetNextOpt(options_context)) > 0 ) {
}
if (result < -1) {
/* an error occurred during option processing */
fprintf(stderr, "%s: %s\n", poptBadOption(options_context, POPT_BADOPTION_NOALIAS), poptStrerror(result));
exit(1);
}
if (img_filename == NULL) {
img_filename = img_filename_default;
}
if (timestr != NULL ) {
/* note: clock_localtime is already initialized here */
strptime(timestr, "%H:%M", clock_localtime);
h = clock_localtime->tm_hour % 12;
m = clock_localtime->tm_min;
}
/* keep hours and minutes into range */
h %= 12;
m %= 60;
/* create the cairo drawing context and an RGBA drawing surface */
surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, img_width, img_height);
context = cairo_create(surface);
/* draw image */
cairo_set_source_rgba(context, 0.0, 0.0, 0.0, 0.0);
cairo_rectangle(context, 0, 0, img_width, img_height);
cairo_fill(context);
int x1 = img_width / 2 -1;
int y1 = img_height / 2 -1;
float r;
if (img_width < img_height) {
r = img_width / 2;
} else {
r = img_height /2;
}
float angle = 2.0f * M_PI / 12.0f;
/* draw clock face */
cairo_set_source_rgba (context, 1.0, 1.0, 1.0, 1.0);
cairo_arc(context, x1, y1, r-4, 0, 2 * M_PI);
cairo_fill(context);
cairo_set_source_rgba (context, 0.0, 0.0, 0.0, 1.0);
cairo_set_line_width (context, 1);
cairo_arc(context, x1, y1, r-4, 0, 2 * M_PI);
cairo_stroke(context);
/* draw markers */
cairo_set_source_rgba (context, 0.0, 0.0, 0.0, 1.0);
cairo_set_line_width (context, 2);
for (int h = 0; h < 12; h++) {
cairo_move_to(context, x1 + (r - 10) * cosf(angle * h), y1 + (r - 10) * sinf(angle * h));
cairo_line_to(context, x1 + (r - 4) * cosf(angle * h), y1 + (r - 4)* sinf(angle * h));
}
cairo_stroke(context);
/* draw handles */
cairo_set_line_width (context, 4);
/* hours handle */
cairo_move_to(context, x1, y1);
cairo_line_to(context, x1 + (r/2 - 4) * sinf(angle * h + angle / 60 * m), y1 - (r/2 - 4) * cosf(angle * h + angle / 60 * m));
/* minutes handle */
cairo_move_to(context, x1, y1);
cairo_line_to(context, x1 + (r - 10) * sinf(M_PI / 30.0f * m ), y1 - (r - 10) * cosf(M_PI / 30.0f * m));
cairo_stroke(context);
/* write image file */
if (cairo_surface_write_to_png(surface, img_filename) != CAIRO_STATUS_SUCCESS) {
fprintf(stderr, "Error saving %s\n", img_filename);
}
/* cleanup */
cairo_surface_destroy(surface);
poptFreeContext(options_context);
return 0;
}
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