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authorWerner Almesberger <werner@almesberger.net>2016-08-03 20:55:51 -0300
committerWerner Almesberger <werner@almesberger.net>2016-08-03 20:55:51 -0300
commit4f119ed77fb3c1949fcfa6a6d1272c8f057730d5 (patch)
tree566874a5711b0ee93d67bc50e65aff220aa78bbd /gui-over.c
parentc59af94d1f14c0b02498a6e1324f19fbf2a8f36f (diff)
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eeshow/gui-over.h, gui-over.c: split overlays from gui.c
Diffstat (limited to 'gui-over.c')
-rw-r--r--gui-over.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/gui-over.c b/gui-over.c
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index 0000000..deca726
--- /dev/null
+++ b/gui-over.c
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+/*
+ * gui-over.c - GUI: overlays
+ *
+ * Written 2016 by Werner Almesberger
+ * Copyright 2016 by Werner Almesberger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+/*
+ * Resources:
+ *
+ * http://zetcode.com/gfx/cairo/cairobackends/
+ * https://developer.gnome.org/gtk3/stable/gtk-migrating-2-to-3.html
+ * https://www.cairographics.org/samples/rounded_rectangle/
+ */
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <math.h>
+
+#include <cairo/cairo.h>
+
+#include "util.h"
+#include "gui-over.h"
+
+
+#define OVER_FONT_SIZE 16
+#define OVER_BORDER 8
+#define OVER_RADIUS 6
+#define OVER_SEP 8
+#define OVER_X0 10
+#define OVER_Y0 10
+
+
+struct overlay {
+ const char *s;
+ struct overlay *next;
+};
+
+
+static void rrect(cairo_t *cr, int x, int y, int w, int h, int r)
+{
+ const double deg = M_PI / 180.0;
+
+ cairo_new_path(cr);
+ cairo_arc(cr, x + w - r, y + r, r, -90 * deg, 0);
+ cairo_arc(cr, x + w - r, y + h - r, r, 0, 90 * deg);
+ cairo_arc(cr, x + r, y + h - r, r, 90 * deg, 180 * deg);
+ cairo_arc(cr, x + r, y + r, r, 180 * deg, 270 * deg);
+ cairo_close_path(cr);
+}
+
+
+static void overlay_draw(const struct overlay *over, cairo_t *cr,
+ int *x, int *y)
+{
+ cairo_text_extents_t ext;
+
+ cairo_set_font_size(cr, OVER_FONT_SIZE);
+ cairo_text_extents(cr, over->s, &ext);
+
+ rrect(cr, *x, *y,
+ ext.width + 2 * OVER_BORDER, ext.height + 2 * OVER_BORDER,
+ OVER_RADIUS);
+
+ cairo_set_source_rgba(cr, 0.8, 0.9, 1, 0.8);
+ cairo_fill_preserve(cr);
+ cairo_set_source_rgba(cr, 0.5, 0.5, 1, 0.7);
+ cairo_set_line_width(cr, 2);
+ cairo_stroke(cr);
+
+ cairo_set_source_rgb(cr, 0, 0, 0);
+ cairo_move_to(cr, *x + OVER_BORDER, *y + OVER_BORDER + ext.height);
+ cairo_show_text(cr, over->s);
+
+ *y += ext.height + OVER_SEP;
+}
+
+
+void overlay_draw_all(const struct overlay *overlays, cairo_t *cr)
+{
+ const struct overlay *over;
+ int x = OVER_X0;
+ int y = OVER_Y0;
+
+ for (over = overlays; over; over = over->next)
+ overlay_draw(over, cr, &x, &y);
+}
+
+
+struct overlay *overlay_add(struct overlay **overlays, const char *s)
+{
+ struct overlay *over;
+ struct overlay **anchor;
+
+ over = alloc_type(struct overlay);
+ over->s = stralloc(s);
+
+ for (anchor = overlays; *anchor; anchor = &(*anchor)->next);
+ over->next = NULL;
+ *anchor = over;
+
+ return over;
+}
+
+
+static void overlay_free(struct overlay *over)
+{
+ free((void *) over->s);
+ free(over);
+}
+
+
+void overlay_remove(struct overlay **overlays, struct overlay *over)
+{
+ struct overlay **anchor;
+
+ for (anchor = overlays; *anchor; anchor = &(*anchor)->next)
+ if (*anchor == over) {
+ *anchor = over->next;
+ overlay_free(over);
+ return;
+ }
+ abort();
+}
+
+
+void overlay_remove_all(struct overlay **overlays)
+{
+ struct overlay *next;
+
+ while (*overlays) {
+ next = (*overlays)->next;
+ overlay_free(*overlays);
+ *overlays = next;
+ }
+}