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/*
Clif - A C-like Interpreter Framework
Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997 T. Hruz, L. Koren
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.
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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* graph.c
*
* Graphic primitives.
*/
#include <math.h>
#ifndef PROTO
#if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined(__STDC__)
#define PROTO(ARGS) ARGS
#else
#define PROTO(ARGS) ()
#endif
#endif
static void d_move PROTO((int, int));
static void d_draw PROTO((int, int, int, int));
static void d_point PROTO((int, int, int, int));
static void window PROTO((int, int, double, double, double, double));
static void move PROTO((int, int, double, double));
static void draw PROTO((int, int, double, double));
static void draw_point PROTO((int, int, double, double));
/* \verbatim{graph_c_window.tex} */
/*
* Creates a window from user's coordinates.
* Counts world coordinates.
* handle - is handle of the window
* n - specifies line in the window (user can have more lines in the window)
* rest are coordinates
*/
static void
window (handle, n, x_left, y_down, x_right, y_up)
int handle, n;
double x_left, y_down, x_right, y_up;
{
channel[handle].member[n].ax =
(channel[handle].w_resolution[0] - 1) / (fabs(x_left - x_right));
channel[handle].member[n].ay =
(channel[handle].w_resolution[1] - 1) / (fabs(y_down - y_up));
}
/* \verbatim */
/* \verbatim{graph_c_move.tex} */
/*
* Moves cursor to the specified position.
* handle - is handle of the window
* n - specifies line in the window (user can have more lines in the window)
* x, y - coordinates
*/
static void
move (handle, n, x, y)
int handle, n;
double x, y;
{
d_move((int)floor ((x - channel[handle].start_time)
* channel[handle].member[n].ax),
channel[handle].w_resolution[1] - 1
- (int)floor ((y - channel[handle].member[n].lower)
* channel[handle].member[n].ay));
}
/* \verbatim */
/* \verbatim{graph_c_draw.tex} */
/*
* Draws a line from the cursor position to the point of coordinates.
* handle - is handle of the window
* n - specifies line in the window (user can have more lines in the window)
* x, y - coordinates
*/
static void
draw (handle, n, x, y)
int handle, n;
double x, y;
{
d_draw (handle, n,
(int)floor ((x - channel[handle].start_time)
* channel[handle].member[n].ax),
channel[handle].w_resolution[1] - 1
- (int)floor ((y - channel[handle].member[n].lower)
* channel[handle].member[n].ay));
}
/* \verbatim */
/* \verbatim{graph_c_draw_point.tex} */
/*
* Draws a point from the coordinates.
* handle - is handle of the window
* n - specifies line in the window (user can have more lines in the window)
* x, y - coordinates
*/
static void
draw_point (handle, n, x, y)
int handle, n;
double x, y;
{
d_point (handle, n,
(int)floor ((x - channel[handle].start_time)
* channel[handle].member[n].ax),
channel[handle].w_resolution[1] - 1
- (int)floor ((y - channel[handle].member[n].lower)
* channel[handle].member[n].ay));
}
/* \verbatim */
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