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/******************************************************************************
** XLander - A three-dimensional view-oriented lunar landing simulation for X
**
** Authors:
** Paul Riddle (paulr@umbc3.umbc.edu)
** Mike Friedman (mikef@umbc3.umbc.edu)
**
** University of Maryland, Baltimore Campus
**
** This program may be freely distributed in any form, providing the authors'
** names stay with it. If you use any portion of this code, please give us
** credit. Let us know if you like it!
******************************************************************************/
/*
* instrument.c contains routines that update the gauges at the bottom of
* the window.
*/
#include "xlander.h"
#include "globals.h"
/******************************************************************************
** setupInstrBuffer
**
** This creates and zeros out a pixmap to be used when updating the control
** panel.
******************************************************************************/
void setupInstrBuffer ()
{
instrBuffer = XCreatePixmap (d, instrWin, viewWidth, panelHeight,
DefaultDepth (d, DefaultScreen (d)));
XSetForeground (d, gcInstr, WhitePixel (d, DefaultScreen (d)));
XFillRectangle (d, instrBuffer, gcInstr, 0, 0, viewWidth, panelHeight);
}
/******************************************************************************
** UpdateInstruments
**
** Given heading and direction of thrust in radians, this routine updates
** the indicators on the control panel.
******************************************************************************/
void UpdateInstruments (heading, roc, fuel, x, y)
float heading, roc, fuel;
int x, y;
{
static int heading_x = 50, heading_y = 15;
static int fuel_level = 80, old_x = 290, old_y = 10;
int new_fuel_level = (int) fuel / 4;
char buf[32];
/*
* Update heading indicator
*/
XDrawLine (d, instrBuffer, gcXor, 50, 50, heading_x, heading_y);
heading_x = 50 + 35 * cos (heading);
heading_y = 50 - 35 * sin (heading);
XDrawLine (d, instrBuffer, gcXor, 50, 50, heading_x, heading_y);
/*
* Update fuel gauge
*/
XFillRectangle (d, instrBuffer, gcXor, 210, 90 - fuel_level, 20,
fuel_level);
XFillRectangle (d, instrBuffer, gcXor, 210, 90 - new_fuel_level, 20,
new_fuel_level);
fuel_level = new_fuel_level;
/*
* Display vertical speed
*/
sprintf (buf, "%06.2f ft/s", roc);
XDrawImageString
(d, instrBuffer, gcInstr,
120, 50 + ((font->ascent + font->descent) >> 1) - font->descent,
buf, strlen (buf));
/*
* Update "radar"
*/
XDrawPoint (d, instrBuffer, gcXor, old_x, old_y);
old_x = WorldToRadarX (x);
old_y = WorldToRadarY (y);
XDrawPoint (d, instrBuffer, gcXor, old_x, old_y);
}
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