/usr/share/doc/libdrawtk0/examples/bars.c is in libdrawtk-dev 2.0-2.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright (C) 2011 EPFL (Ecole Polytechnique Fédérale de Lausanne)
Nicolas Bourdaud <nicolas.bourdaud@epfl.ch>
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 3 of the License, 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/>.
*/
/* Example : bars.c
*
* This program demonstrates how to use a composite shape and text shape.
* An evolving bar (with ticks and labels) is moving along an ellipsis.
* Clicking on the close button of the window closes the demo.
* This shows how to:
* - setup and use a composite shape
* - use fonts and text shape
* - use the timing functions
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <math.h>
#include <drawtk.h>
#include <dtk_colors.h>
#include <dtk_event.h>
#include <dtk_time.h>
/* Parameters of the size of the bar */
#define WID (1.0f)
#define BARH (0.15f)
#define TLEN (0.05f)
#define COL dtk_white
#define BCOL dtk_blue
#define TEXTSIZE 0.1f
static dtk_hwnd wnd = NULL;
static dtk_hshape comp = NULL;
static dtk_hshape bar = NULL;
static dtk_hfont font = NULL;
/* Timestamp of the beginning of the animation */
static struct dtk_timespec tini;
static
void setup_shapes(void)
{
/* Create certain number of shapes creating bar, ticks and labels */
dtk_hshape shapes[] = {
dtk_create_rectangle_2p(NULL, 0.0f, 0.0f, WID, BARH,0,BCOL),
dtk_create_rectangle_2p(NULL, -WID, 0.0f, WID, BARH, 0,COL),
dtk_create_line(NULL, -WID, -TLEN, -WID, 0.0f, COL),
dtk_create_line(NULL, -WID/2, -TLEN, -WID/2, 0.0f, COL),
dtk_create_line(NULL, 0.0f, -TLEN, 0.0f, 0.0f, COL),
dtk_create_line(NULL, WID/2, -TLEN, WID/2, 0.0f, COL),
dtk_create_line(NULL, WID, -TLEN, WID, 0.0f, COL),
dtk_create_string(NULL, "-1.0", TEXTSIZE, -WID, -TLEN,
DTK_TOP|DTK_HMID, COL, font),
dtk_create_string(NULL, "-0.5", TEXTSIZE, -WID/2, -TLEN,
DTK_TOP|DTK_HMID, COL, font),
dtk_create_string(NULL, "0.0", TEXTSIZE, 0.0f, -TLEN,
DTK_TOP|DTK_HMID, COL, font),
dtk_create_string(NULL, "0.5", TEXTSIZE, WID/2, -TLEN,
DTK_TOP|DTK_HMID, COL, font),
dtk_create_string(NULL, "1.0", TEXTSIZE, WID, -TLEN,
DTK_TOP|DTK_HMID, COL, font)
};
/* Keep the pointer to this shape since we will use it to modify
the displayed bar in the update_bar() function */
bar = shapes[0];
/* Combine previous shapes altogether to create a unique shape
easier to manipulate.
Since we specify that the destruction of the composite should
destroy the underlying shapes, we don't need to keep a pointer
to each one individually */
comp = dtk_create_composite_shape(NULL,
sizeof(shapes)/sizeof(shapes[0]),
shapes, 1);
}
static
void cleanup_shapes(void)
{
/* Destroying the composite will destroy the other shapes as well
since we have specified this behavior at the creation of the
composite (see setup_shapes() function) */
dtk_destroy_shape(comp);
}
static
void redraw(dtk_hwnd wnd)
{
/* Erase previous draw
This is necessary since a redraw does not cover the whole window */
dtk_clear_screen(wnd);
/* Draw the rectangle on the window */
dtk_draw_shape(comp);
/* refresh the window */
dtk_update_screen(wnd);
}
static
void update_bar(void)
{
float t, x;
struct dtk_timespec ts;
/* Measure how much spent since last update */
dtk_gettime(&ts);
t = dtk_difftime_ms(&ts, &tini);
/* Update the bar length */
x = cos(2*3.14*t/1000);
bar = dtk_create_rectangle_2p(bar, 0.0f, 0.0f, x, BARH, 1, BCOL);
/* Update the position of the composite */
dtk_move_shape(comp, 0.1*cos(t/1000), 0.2*sin(t/1000));
}
int main(void)
{
struct dtk_timespec delay = {0, 5000000}; /* 5ms */
/* Setup a a window to performe the drawings and
register its event handling function */
wnd = dtk_create_window(1024, 768, 0, 0, 16, "hello");
dtk_make_current_window(wnd);
/* Load the font used for the labels */
font = dtk_load_font("Arial");
setup_shapes();
dtk_gettime(&tini); /* Measure the initial timestamp */
while (dtk_process_events(wnd)) {
dtk_nanosleep(0, &delay, NULL);
update_bar();
redraw(wnd);
}
/* Cleanup all created resources */
cleanup_shapes();
dtk_destroy_font(font);
dtk_close(wnd);
return 0;
}
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