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Diffstat (limited to '')
| -rw-r--r-- | demo.c | 198 |
1 files changed, 198 insertions, 0 deletions
@@ -0,0 +1,198 @@ +/* See LICENSE file for copyright and license details. */ +#include "libtracebitmap.h" + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#define MIN(A, B) ((A) < (B) ? (A) : (B)) +#define MAX(A, B) ((A) > (B) ? (A) : (B)) + + +struct data { + size_t height; + size_t width; + size_t y; + size_t x; + int beginning; + const char ***plot; +}; + + +static int +new_component(int negative, void *user_data) +{ + struct data *data = user_data; + data->beginning = 1; + printf("%s", negative ? "-" : "+"); + fflush(stdout); + return 0; +} + +static const char * +mix(const char *a, const char *b) +{ + static const struct { + const char *text; + uint16_t bits; + } symbols[] = { + {" ", 0x0000}, {"┼", 0x1111}, + {"╵", 0x1000}, {"┬", 0x0111}, + {"╶", 0x0100}, {"┤", 0x1011}, + {"╷", 0x0010}, {"┴", 0x1101}, + {"╴", 0x0001}, {"├", 0x1110}, + {"│", 0x1010}, {"─", 0x0101}, + {"└", 0x1100}, {"┐", 0x0011}, + {"┘", 0x1001}, {"┌", 0x0110} + }; + uint16_t bits; + size_t i, j; + for (i = 0; strcmp(a, symbols[i].text); i++); + for (j = 0; strcmp(b, symbols[j].text); j++); + bits = symbols[i].bits | symbols[j].bits; + for (i = 0; bits != symbols[i].bits; i++); + return symbols[i].text; +} + +static int +new_stop(size_t y, size_t x, void *user_data) +{ + struct data *data = user_data; + size_t y0, y1, y2; + size_t x0, x1, x2; + printf(" (%zu,%zu)", y, x); + fflush(stdout); + if (data->beginning) { + data->beginning = 0; + data->y = y; + data->x = x; + } else { + y0 = MIN(data->y, y); + x0 = MIN(data->x, x); + y2 = MAX(data->y, y); + x2 = MAX(data->x, x); + if (y0 == y2) { + y1 = y0; + for (x1 = x0; x1 < x2; x1++) { + data->plot[y1 * 2][x1 * 2 + 0] = mix(data->plot[y1 * 2][x1 * 2 + 0], "╶"); + data->plot[y1 * 2][x1 * 2 + 1] = mix(data->plot[y1 * 2][x1 * 2 + 1], "─"); + data->plot[y1 * 2][x1 * 2 + 2] = mix(data->plot[y1 * 2][x1 * 2 + 2], "╴"); + } + } else { + x1 = x0; + for (y1 = y0; y1 < y2; y1++) { + data->plot[y1 * 2 + 0][x1 * 2] = mix(data->plot[y1 * 2 + 0][x1 * 2], "╷"); + data->plot[y1 * 2 + 1][x1 * 2] = mix(data->plot[y1 * 2 + 1][x1 * 2], "│"); + data->plot[y1 * 2 + 2][x1 * 2] = mix(data->plot[y1 * 2 + 2][x1 * 2], "╵"); + } + } + data->y = y; + data->x = x; + } + return 0; +} + + +static int +component_finished(void *user_data) +{ + (void) user_data; + printf("\n"); + fflush(stdout); + return 0; +} + + +int +main(void) +{ + struct libtracebitmap_bitmap bitmap; + size_t size = 0; + size_t len = 0; + ssize_t rd; + size_t width, i, j; + size_t y, x; + int r; + const char ***plot; + struct data data; + + bitmap.image = NULL; + for (;;) { + if (len == size) { + size += 1024; + bitmap.image = realloc(bitmap.image, size); + if (!bitmap.image) { + perror("realloc"); + exit(1); + } + } + rd = read(STDIN_FILENO, &bitmap.image[len], size - len); + if (rd <= 0) { + if (!rd) + break; + perror("read"); + exit(1); + } + len += (size_t)rd; + } + + bitmap.height = 0; + bitmap.width = 0; + width = 0; + for (i = j = 0; j < len; j++) { + if ((char)bitmap.image[j] == '\n') { + if (!bitmap.height++) { + bitmap.width = width; + } else { + if (bitmap.width != width) { + fprintf(stderr, "Invalid input: each line must have the same length.\n"); + exit(1); + } + } + width = 0; + } else if ((char)bitmap.image[j] == '.') { + bitmap.image[i++] = LIBTRACEBITMAP_INK_OFF; + width += 1; + } else if ((char)bitmap.image[j] == 'x') { + bitmap.image[i++] = LIBTRACEBITMAP_INK_ON; + width += 1; + } else { + fprintf(stderr, "Invalid input: may only contain '.', 'x', and <newline> characters.\n"); + exit(1); + } + } + if (width) { + fprintf(stderr, "Invalid input: must end with <newline> character.\n"); + exit(1); + } + + plot = calloc(bitmap.height * 2 + 1, sizeof(*plot)); + for (y = 0; y < bitmap.height * 2 + 1; y++) { + plot[y] = calloc(bitmap.width * 2 + 1, sizeof(**plot)); + for (x = 0; x < bitmap.width * 2 + 1; x++) + plot[y][x] = " "; + } + for (y = 0, i = 0; y < bitmap.height; y++) + for (x = 0; x < bitmap.width; x++, i++) + plot[y * 2 + 1][x * 2 + 1] = (bitmap.image[i] == LIBTRACEBITMAP_INK_ON ? "x" : "."); + + data.height = bitmap.height; + data.width = bitmap.width; + data.plot = plot; + + r = libtracebitmap_trace(&bitmap, new_component, new_stop, component_finished, &data); + if (r) + exit(r); + + for (y = 0; y < bitmap.height * 2 + 1; y++) { + for (x = 0; x < bitmap.width * 2 + 1; x++) + printf("%s", plot[y][x]); + printf("\n"); + free(plot[y]); + } + + free(plot); + free(bitmap.image); + return 0; +} |