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/*
* Copyright (C) 2016 Robin Gareus <robin@gareus.org>
*
* 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, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <math.h>
#include <cairo/cairo.h>
#include <pango/pango.h>
#include <pango/pangocairo.h>
static void draw_text (cairo_t* cr, PangoLayout* pl, const char* txt) {
int tw, th;
cairo_save (cr);
cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 1.0);
pango_layout_set_text (pl, txt, -1);
// rotate 90deg ? maybe
pango_layout_get_pixel_size (pl, &tw, &th);
cairo_translate (cr, -tw / 2.0, -th / 2.0);
pango_cairo_layout_path (cr, pl);
cairo_fill (cr);
cairo_restore (cr);
}
static void draw_swinger (cairo_t* cr, int w, int h, int n_steps) {
int i;
PangoLayout* pl = pango_cairo_create_layout (cr);
PangoFontDescription *desc = pango_font_description_from_string ("Sans 14px"); // XXX use MOD font
pango_layout_set_font_description (pl, desc);
pango_font_description_free (desc);
cairo_pattern_t* pat = cairo_pattern_create_linear (0.0, 0.0, 3.0, h);
#if 0
cairo_pattern_add_color_stop_rgba (pat, 0.00, 1.0, 0.0, 0.0, 1.0);
cairo_pattern_add_color_stop_rgba (pat, 0.33, 1.0, 0.6, 0.2, 1.0);
cairo_pattern_add_color_stop_rgba (pat, 0.60, 0.0, 1.0, 0.0, 1.0);
cairo_pattern_add_color_stop_rgba (pat, 1.00, 0.0, 0.0, 1.0, 1.0);
#else
cairo_pattern_add_color_stop_rgba (pat, 0.00, 1.0, 0.6, 0.2, 1.0);
cairo_pattern_add_color_stop_rgba (pat, 0.33, 1.0, 0.6, 0.2, 1.0);
cairo_pattern_add_color_stop_rgba (pat, 1.00, 0.5, 0.3, 0.1, 1.0);
#endif
const int nsm1 = n_steps - 1;
for (i = 0; i < n_steps; ++i) {
cairo_save (cr);
cairo_translate (cr, i * w, 0);
cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 1.0);
cairo_rectangle (cr, 0, 0, w, h);
cairo_fill (cr);
float vh = h * i / (n_steps - 1.f);
cairo_rectangle (cr, 0, h - vh, w, vh);
cairo_set_source (cr, pat);
cairo_fill (cr);
cairo_translate (cr, w * .5, h * .5);
if (i == 0) {
draw_text (cr, pl, "1:1");
}
if ( 6 * nsm1 == 15 * i) {
draw_text (cr, pl, "3:2");
}
if ( 10 * nsm1 == 15 * i) {
draw_text (cr, pl, "2:1");
}
if ( 15 * nsm1 == 15 * i) {
draw_text (cr, pl, "3:1");
}
cairo_restore (cr);
}
g_object_unref (pl);
}
int main (int argc, char **argv) {
int w = 30;
int h = 42;
/* need to be able to represent
* 0, 0.2, 1/3 and 0.5
* common denominator 30:
* 0, 6, 10, 15
*/
int n_steps = 31;
cairo_surface_t* cs = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, n_steps * w, h);
cairo_t* cr = cairo_create (cs);
draw_swinger (cr, w, h, n_steps);
cairo_surface_write_to_png (cs, "../modgui/swinger.png");
cairo_destroy (cr);
cairo_surface_destroy (cs);
return 0;
}
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