mirror of
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142 lines
2.9 KiB
C
142 lines
2.9 KiB
C
/*
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* gui-over.c - GUI: overlays
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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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/*
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* Resources:
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*
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* http://zetcode.com/gfx/cairo/cairobackends/
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* https://developer.gnome.org/gtk3/stable/gtk-migrating-2-to-3.html
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* https://www.cairographics.org/samples/rounded_rectangle/
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*/
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#include <stddef.h>
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#include <stdlib.h>
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#include <math.h>
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#include <cairo/cairo.h>
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#include "util.h"
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#include "gui-over.h"
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#define OVER_FONT_SIZE 16
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#define OVER_BORDER 8
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#define OVER_RADIUS 6
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#define OVER_SEP 8
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#define OVER_X0 10
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#define OVER_Y0 10
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struct overlay {
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const char *s;
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struct overlay *next;
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};
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static void rrect(cairo_t *cr, int x, int y, int w, int h, int r)
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{
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const double deg = M_PI / 180.0;
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cairo_new_path(cr);
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cairo_arc(cr, x + w - r, y + r, r, -90 * deg, 0);
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cairo_arc(cr, x + w - r, y + h - r, r, 0, 90 * deg);
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cairo_arc(cr, x + r, y + h - r, r, 90 * deg, 180 * deg);
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cairo_arc(cr, x + r, y + r, r, 180 * deg, 270 * deg);
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cairo_close_path(cr);
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}
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static void overlay_draw(const struct overlay *over, cairo_t *cr,
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int *x, int *y)
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{
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cairo_text_extents_t ext;
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cairo_set_font_size(cr, OVER_FONT_SIZE);
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cairo_text_extents(cr, over->s, &ext);
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rrect(cr, *x, *y,
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ext.width + 2 * OVER_BORDER, ext.height + 2 * OVER_BORDER,
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OVER_RADIUS);
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cairo_set_source_rgba(cr, 0.8, 0.9, 1, 0.8);
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cairo_fill_preserve(cr);
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cairo_set_source_rgba(cr, 0.5, 0.5, 1, 0.7);
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cairo_set_line_width(cr, 2);
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cairo_stroke(cr);
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cairo_set_source_rgb(cr, 0, 0, 0);
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cairo_move_to(cr, *x + OVER_BORDER, *y + OVER_BORDER + ext.height);
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cairo_show_text(cr, over->s);
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*y += ext.height + OVER_SEP;
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}
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void overlay_draw_all(const struct overlay *overlays, cairo_t *cr)
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{
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const struct overlay *over;
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int x = OVER_X0;
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int y = OVER_Y0;
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for (over = overlays; over; over = over->next)
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overlay_draw(over, cr, &x, &y);
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}
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struct overlay *overlay_add(struct overlay **overlays, const char *s)
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{
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struct overlay *over;
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struct overlay **anchor;
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over = alloc_type(struct overlay);
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over->s = stralloc(s);
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for (anchor = overlays; *anchor; anchor = &(*anchor)->next);
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over->next = NULL;
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*anchor = over;
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return over;
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}
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static void overlay_free(struct overlay *over)
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{
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free((void *) over->s);
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free(over);
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}
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void overlay_remove(struct overlay **overlays, struct overlay *over)
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{
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struct overlay **anchor;
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for (anchor = overlays; *anchor; anchor = &(*anchor)->next)
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if (*anchor == over) {
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*anchor = over->next;
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overlay_free(over);
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return;
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}
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abort();
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}
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void overlay_remove_all(struct overlay **overlays)
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{
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struct overlay *next;
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while (*overlays) {
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next = (*overlays)->next;
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overlay_free(*overlays);
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*overlays = next;
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}
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}
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