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141 lines
2.5 KiB
C
141 lines
2.5 KiB
C
/*
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* text.c - FIG text object
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*
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* Written 2016 by Werner Almesberger
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* Copyright 2016 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include "util.h"
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#include "fig.h"
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#include "text.h"
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void text_init(struct text *txt)
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{
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txt->s = NULL;
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txt->size = 0;
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txt->x = txt->y = 0;
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txt->rot = 0;
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txt->hor = text_mid;
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txt->vert = text_mid;
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}
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void text_free(struct text *txt)
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{
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free((void *) txt->s);
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txt->s = NULL;
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}
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void text_set(struct text *txt, const char *s)
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{
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free((void *) txt->s);
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txt->s = stralloc(s);
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}
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static int rx(int x, int y, int rot)
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{
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float a = rot / 180.0 * M_PI;
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return cos(a) * x + sin(a) * y;
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}
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static int ry(int x, int y, int rot)
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{
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float a = rot / 180.0 * M_PI;
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return -sin(a) * x + cos(a) * y;
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}
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static int align(int dim, enum text_align align)
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{
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switch (align) {
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case text_min:
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return 0;
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case text_mid:
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return dim / 2;
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case text_max:
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return dim;
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default:
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abort();
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}
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}
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void text_fig(const struct text *txt, int color, unsigned layer)
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{
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int x = txt->x;
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int y = txt->y;
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x += rx(0, align(txt->size, txt->vert), txt->rot);
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y += ry(0, align(txt->size, txt->vert), txt->rot);
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fig_text(x, y, txt->s, txt->size, txt->hor, txt->rot, color, layer);
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}
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static unsigned guess_width(const struct text *txt)
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{
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/*
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* Note that fig.c stretches the text size, so the ratio is larger than
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* expressed here.
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*/
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return strlen(txt->s) * txt->size * 1.0;
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}
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void text_rel(const struct text *txt, enum text_align xr, enum text_align yr,
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int dx, int dy, int *res_x, int *res_y)
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{
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dx -= align(guess_width(txt), txt->hor);
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dy += align(txt->size, txt->vert);
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dx += align(guess_width(txt), xr);
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dy -= align(txt->size, yr);
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if (res_x)
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*res_x = txt->x + rx(dx, dy, txt->rot);
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if (res_y)
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*res_y = txt->y + ry(dx, dy, txt->rot);
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}
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void text_shift(struct text *txt, enum text_align xr, enum text_align yr,
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int dx, int dy)
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{
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text_rel(txt, xr, yr, dx, dy, &txt->x, &txt->y);
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}
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int text_rel_x(const struct text *txt, enum text_align xr, enum text_align yr,
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int dx, int dy)
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{
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int x;
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text_rel(txt, xr, yr, dx, dy, &x, NULL);
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return x;
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}
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int text_rel_y(const struct text *txt, enum text_align xr, enum text_align yr,
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int dx, int dy)
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{
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int y;
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text_rel(txt, xr, yr, dx, dy, NULL, &y);
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return y;
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}
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