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Suncalc.c
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Suncalc.c
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//#define SaverAnim
#define PALIDX
/*
Sunclock for Windows
Astronomical Calculation Routines
*/
#include "sunclock.h"
#define TERMINC 100 /* Circle segments for terminator */
#define PROJINT (60 * 10) /* Frequency of seasonal recalculation
in seconds. */
int runmode = TRUE; /* Update time if true */
int animate = FALSE; /* Animate simulated time display ? */
int displaymode = 0; /* Display mode: 0 = Auto-sense
1 = Monochrome
16 = Colour vector
255 = Grey scale bitmap
256 = Colour bitmap */
int imageBitmap; // Index of chosen image bitmap
int bitmapNum; // Number of map bitmaps available
double faketime = 0.0; /* Time increment for test mode */
int lincr = 0; /* Animation mode time increment */
int idir = 1; /* Simulated time increment/decrement */
int anirate = 1; /* Animation rate */
int tracking = FALSE; /* Tracking satellite ? */
int satx, saty; /* Satellite co-ordinates */
int showmoon = TRUE; /* Show Moon on open window map ? */
int cuckooClock = TRUE; /* Chirp the hours and half hours ? */
HANDLE earthImageDIB = NULL; /* Handle to master image DIB */
static HBITMAP blitMap = NULL; /* Bitmap for window repair */
int ImageWid; /* Width of master image */
int ImageHgt; /* Height of master image */
int xdots, ydots; /* Window size */
static int chunks = 1; // Number of vertical chunks in which to paint bitmap
static int onoon = -1; /* Previous pixel longitude of noon */
static int sronoon = -1; // Screen resolution pixel longitude of noon
static int renoon = TRUE; /* Recompute noon ? */
static short *wtab = NULL, *wtab1 = NULL, *wtabs;
static int wtabsize; /* Width table size */
static struct timeb tbtp;
static long cctime; /* Time to display (real or simulated) */
static long lctime = 0; /* Last full calculation time */
double siteLat = 51.5; // Observing site latitude
double siteLon = 0; // Observing site longitude
char siteName[128] = "Greenwich"; // Observing site name
HPALETTE imagePal = NULL; /* Custom colour palette */
static struct {
WORD palVersion;
WORD palNumEntries;
PALETTEENTRY palPalEntry[256];
} logpal;
#ifdef ScreenSaver
extern int textHeight; // System font height
#else
struct satellite sat = {""}; /* Current satellite arguments */
static int satdisp = FALSE; /* True if satellite to be shown */
#ifdef TRAILS
static int needtrail = TRUE; /* Need satellite orbit trail ? */
#endif
static int tickoff = FALSE; /* Satellite blinker */
#endif
static char last_icon_tag[20]; /* Old icon label */
static char dateSep[2], timeSep[2], amPM[2][5];
static int dateFormat, timeFormat;
TIME_ZONE_INFORMATION tzInfo; // Time zone information
char *tzName[2] = { "", "" }; // Time zone names
#define DispMode (abs(displaymode))
#define ImageMode ((earthImageDIB != NULL) && (DispMode >= 255))
/* Forward functions. */
static void updimage(HWND hWnd, RECT cRect, HDC hDC, int istimer, int copyCat);
// SET_TM_TIME -- Set time from Windows system or local time
void set_tm_time(struct tm *t, BOOL islocal)
{
#define CtF(tf, sf) t->tf = s.sf
SYSTEMTIME s;
if (islocal) {
GetLocalTime(&s);
} else {
GetSystemTime(&s);
}
CtF(tm_sec, wSecond);
CtF(tm_min, wMinute);
CtF(tm_hour, wHour);
CtF(tm_mday, wDay);
CtF(tm_mon, wMonth - 1);
CtF(tm_year, wYear - 1900);
CtF(tm_wday, wDayOfWeek);
// tm_yday never used
t->tm_isdst = GetTimeZoneInformation(&tzInfo) == TIME_ZONE_ID_DAYLIGHT;
}
/* LOCALTIMEFORMAT -- Retrieve localised date and time format from profile. */
void localtimeformat(void)
{
static char context[] = "intl";
dateFormat = GetProfileInt(context, "iDate", 0);
timeFormat = GetProfileInt(context, "iTime", 0);
GetProfileString(context, "sDate", "/", dateSep, 2);
GetProfileString(context, "sTime", ":", timeSep, 2);
GetProfileString(context, "s1159", "AM", amPM[0], 5);
GetProfileString(context, "s2359", "PM", amPM[1], 5);
}
/* EDTIME -- Edit time in localised format. */
static void edtime(char *str, int hh, int mm, int ss)
{
if (timeFormat == 1) {
sprintf(str, Format(0), hh, timeSep, mm, timeSep, ss);
} else {
sprintf(str, Format(1), (hh % 12) ? (hh % 12) : 12,
timeSep, mm, timeSep, ss, amPM[hh / 12]);
}
}
/* EDDATE -- Edit date in localised format. */
static void eddate(char *str, long yy, int mm, int dd, int wday)
{
sprintf(str, Format(3), rstring(IDS_DAY_NAMES + wday),
dateFormat == 1 ? (long) dd : (dateFormat == 2 ? yy : (long) mm),
dateSep,
dateFormat == 1 ? mm : (dateFormat == 2 ? mm : dd),
dateSep,
dateFormat == 1 ? yy : (dateFormat == 2 ? (long) dd : yy));
}
/* EDATIME -- Edit abbreviated time in localised format. */
static void edatime(char *str, int hh, int mm, int ss)
{
if (timeFormat == 1) {
sprintf(str, Format(9), hh, timeSep, mm, timeSep, ss);
} else {
sprintf(str, Format(10), (hh % 12) ? (hh % 12) : 12,
timeSep, mm, amPM[hh / 12]);
}
}
/* EDADATE -- Edit abbreviated date in localised format. */
static void edadate(char *str, int mm, int dd)
{
sprintf(str, Format(11),
dateFormat == 1 ? dd : mm,
dateSep,
dateFormat == 1 ? mm : dd);
}
/* RSTRING -- Retrieve a string from the resource file. */
char *rstring(int resid)
{
#define maxCStrings 10 /* Maximum concurrently used strings */
static char rstrings[maxCStrings][80];
static int n = 0;
int m = n;
if (LoadString(hInst, resid, rstrings[m], 79) < 0) {
strcpy(rstrings[m], "");
}
n = (n + 1) % maxCStrings;
return rstrings[m];
}
/* INVALIDATE_REFRESH -- Invalidate the screen refresh bitmap kept
to expedite damaged window repair. */
void invalidate_refresh(void)
{
if (blitMap != NULL) {
DeleteObject(blitMap);
blitMap = NULL;
}
}
/* RELEASE_BITMAPS -- Release retained objects for display generation. */
void release_bitmaps(void)
{
invalidate_refresh();
if (imagePal != NULL) {
DeleteObject(imagePal);
imagePal = NULL;
}
if (earthImageDIB != NULL) {
FreeResource(earthImageDIB);
earthImageDIB = NULL;
}
}
#ifdef PALIDX
/* PALMAPSTART -- Create a replacement palette bitmap header. */
static HGLOBAL pmBuf = NULL;
LPBITMAPINFOHEADER palMapStart(LPBITMAPINFOHEADER bh, int *bmode)
{
WORD i, ncol, offbits;
LPBITMAPINFOHEADER bm = NULL;
unsigned short FAR *palidx;
assert(pmBuf == NULL);
ncol = (WORD) (bh->biClrUsed == 0 ? (1L << bh->biBitCount) : bh->biClrUsed);
offbits = (WORD) (bh->biSize + ncol * sizeof(RGBQUAD));
pmBuf = GlobalAlloc(GMEM_MOVEABLE, (DWORD) offbits);
if (pmBuf != NULL) {
bm = GlobalLock(pmBuf);
}
if (bm != NULL) {
*bmode = DIB_PAL_COLORS;
memcpy(bm, bh, offbits);
bm->biClrUsed = bm->biClrImportant = 246;
palidx = (unsigned short FAR *) ((LPBITMAPINFO) bm)->bmiColors;
for (i = 0; i < bm->biClrUsed; i++) {
*palidx++ = (unsigned short) i;
}
return bm;
}
*bmode = DIB_RGB_COLORS;
return bh;
}
/* PALMAPEND -- Release palette map buffer, if any. */
void palMapEnd(void)
{
if (pmBuf != NULL) {
GlobalUnlock(pmBuf);
GlobalFree(pmBuf);
pmBuf = NULL;
}
}
#endif
/* NEEDIMAGEBITMAP -- Make sure image bitmap and palette are loaded. */
static void needImageBitmap(void)
{
int i;
LPBITMAPINFOHEADER bh;
if (earthImageDIB == NULL) {
#ifdef ScreenSaver
earthImageDIB = LoadResource(hInst,
FindResource(hInst, "earth", RT_BITMAP));
#else
if (imageBitmap >= bitmapNum) {
imageBitmap = 0;
}
mapbitsGetBitMap(imageBitmap, &earthImageDIB);
#endif
}
bh = (LPBITMAPINFOHEADER) LockResource(earthImageDIB);
ImageWid = (int) bh->biWidth;
ImageHgt = (int) bh->biHeight;
if (imagePal == NULL) {
/* Extract the day and night colour palettes from the DIB file and
construct a memory logical palette embodying those colours. Then
register the palette with the system to provide those colours on
the display board. Note that if the user wants a grey scale map
window, we transform the colours in the selected bitmap's
palette into grey scale here. */
logpal.palVersion = 0x300;
#ifdef PALIDX
logpal.palNumEntries = 246;
#else
logpal.palNumEntries = 117 * 2;
#endif
for (i = 0; i < 117; i++) {
RGBQUAD q = *((LPRGBQUAD) &((LPBITMAPINFO) bh)->bmiColors[i]);
if (DispMode == 255) {
double fgs;
fgs = (q.rgbRed * 0.30) +
(q.rgbGreen * 0.59) +
(q.rgbBlue * 0.11);
if (fgs > 255.0) {
fgs = 255;
}
logpal.palPalEntry[i].peRed =
logpal.palPalEntry[i].peGreen =
logpal.palPalEntry[i].peBlue = (BYTE) fgs;
} else {
logpal.palPalEntry[i].peRed = q.rgbRed;
logpal.palPalEntry[i].peGreen = q.rgbGreen;
logpal.palPalEntry[i].peBlue = q.rgbBlue;
}
logpal.palPalEntry[i].peFlags = PC_NOCOLLAPSE;
}
for (i = 0; i < 117; i++) {
RGBQUAD q = *((LPRGBQUAD) &((LPBITMAPINFO) bh)->bmiColors[i + 128]);
#ifdef PALIDX
if (DispMode == 255) {
double fgs;
fgs = (q.rgbRed * 0.30) +
(q.rgbGreen * 0.59) +
(q.rgbBlue * 0.11);
if (fgs > 255.0) {
fgs = 255;
}
logpal.palPalEntry[128 + i].peRed =
logpal.palPalEntry[128 + i].peGreen =
logpal.palPalEntry[128 + i].peBlue = (BYTE) fgs;
} else {
logpal.palPalEntry[128 + i].peRed = q.rgbRed;
logpal.palPalEntry[128 + i].peGreen = q.rgbGreen;
logpal.palPalEntry[128 + i].peBlue = q.rgbBlue;
}
logpal.palPalEntry[128 + i].peFlags = PC_NOCOLLAPSE;
#else
if (DispMode == 255) {
double fgs;
fgs = (q.rgbRed * 0.30) +
(q.rgbGreen * 0.59) +
(q.rgbBlue * 0.11);
if (fgs > 255.0) {
fgs = 255;
}
logpal.palPalEntry[117 + i].peRed =
logpal.palPalEntry[117 + i].peGreen =
logpal.palPalEntry[117 + i].peBlue = (BYTE) fgs;
} else {
logpal.palPalEntry[117 + i].peRed = q.rgbRed;
logpal.palPalEntry[117 + i].peGreen = q.rgbGreen;
logpal.palPalEntry[117 + i].peBlue = q.rgbBlue;
}
logpal.palPalEntry[117 + i].peFlags = PC_NOCOLLAPSE;
#endif
}
imagePal = CreatePalette((LPLOGPALETTE) &logpal);
}
UnlockResource(earthImageDIB);
}
/* NEW_DISPLAY_MODE -- Change display mode on the fly. */
void new_display_mode(HWND hWnd, int mode)
{
HDC hDC;
release_bitmaps();
displaymode = mode;
hDC = GetDC(hWnd);
ringgg(hWnd, hDC, TRUE, FALSE);
ReleaseDC(hWnd, hDC);
#ifndef ScreenSaver
satviewchanged();
#endif
}
/* GO_ICONIC -- Initialise when window is minimised to an icon. */
void go_iconic(HWND hWnd)
{
RECT r;
GetClientRect(hWnd, &r);
SetWindowPos(hWnd, NULL, 0, 0, 2 * r.right, r.bottom, SWP_NOMOVE + SWP_NOZORDER);
strcpy(last_icon_tag, ""); /* Force icon tag redisplay */
SetWindowText(hWnd, last_icon_tag); /* Initially clear icon title */
release_bitmaps(); /* Prepare for display in icon */
}
/* START_DRAWING -- Set up to begin painting in client area. */
static HPALETTE sdHpal;
static void start_drawing(HDC hDC)
{
#ifndef ScreenSaver
if (imagePal != NULL) {
sdHpal = SelectPalette(hDC, imagePal, FALSE);
RealizePalette(hDC);
}
undrawsat(hWndMain);
undrawmoon(hDC);
#endif
}
/* END_DRAWING -- End painting in client area. */
static void end_drawing(HDC hDC) {
#ifndef ScreenSaver
drawmoon(hDC);
drawsat(hWndMain);
if (imagePal != NULL) {
SelectPalette(hDC, sdHpal, FALSE);
RealizePalette(hDC);
}
#endif
}
#ifdef ScreenSaver
/* SSAVETIME -- Edit and time for screen saver display. */
static void ssavetime(HDC hDC, struct tm lt, RECT tr)
{
if (!fChildPreview) {
char tbuf[80];
strcpy(tbuf, " ");
edtime(tbuf + strlen(tbuf), lt.tm_hour, lt.tm_min, lt.tm_sec);
strcat(tbuf, " ");
strcat(tbuf, tzName[!!lt.tm_isdst]);
strcat(tbuf, " ");
eddate(tbuf + strlen(tbuf), (long) (lt.tm_year + 1900), lt.tm_mon + 1, lt.tm_mday, lt.tm_wday);
strcat(tbuf, " ");
tr.bottom = tr.top;
tr.top = tr.top - textHeight;
SetBkMode(hDC, OPAQUE);
SetBkColor(hDC, RGB(0, 0, 0));
SetTextColor(hDC, RGB(0, 255, 0));
DrawText(hDC, tbuf, strlen(tbuf), &tr, DT_CENTER | DT_BOTTOM | DT_NOCLIP | DT_SINGLELINE);
}
}
#endif
/* RANDINT -- Return a pseudorandom integer value between vmin and vmax
inclusive. */
static int randInt(int vmin, int vmax)
{
int range = vmax - vmin;
int ptwo = 1;
int v;
while (range >= ptwo) {
ptwo <<= 1;
}
ptwo--;
do {
v = rand() & ptwo;
} while (v > range);
return v + vmin;
}
/* RINGGG -- Update status on interval timer ticks and redraw
window if needed. */
static HDC hhdc; /* HDC hidden argument to drawvec */
static int lx, ly; /* Last X and Y for optimisation */
static int yieldYet; // Time to yield to other processes ?
#ifdef POLLY
extern POINT pLine[POLLY]; // Share vector list with SATVIEW.C
extern int pLinel;
#endif
#pragma check_stack (off)
static void PASCAL drawvec(int x1, int y1, int x2, int y2)
{
#ifdef POLLY
if (pLinel >= POLLY || (x1 != lx || y1 != ly)) {
if (pLinel > 0) {
Polyline(hhdc, pLine, pLinel);
}
pLine[0].x = x1;
pLine[0].y = y1;
pLine[1].x = x2;
pLine[1].y = y2;
pLinel = 2;
} else {
pLine[pLinel].x = x2;
pLine[pLinel++].y = y2;
}
lx = x2;
ly = y2;
#else
if (x1 != lx || y1 != ly) {
lx = x1;
ly = y1;
MoveTo(hhdc, x1, y1);
}
if ((++yieldYet) > 1000) {
MSG dmsg;
PeekMessage(&dmsg, NULL, WM_MOUSEFIRST, WM_MOUSELAST, PM_REMOVE);
yieldYet = 0;
}
LineTo(hhdc, x2, y2);
#endif
}
#pragma check_stack ()
void ringgg(HWND hWnd, HDC hDC, int repaint, int copyCat)
{
HINSTANCE hi;
static RECT windex;
hi = hInst;
#ifdef ScreenSaver
{
struct tm lt;
int swid, sheight, xoff, yoff, dualscreen;
static int lmin = -1;
set_tm_time(<, TRUE);
#ifndef SaverAnim
if (lt.tm_min == lmin) {
ssavetime(hDC, lt, windex);
return;
}
#endif
lmin = lt.tm_min;
GetClientRect(hWnd, &windex);
/* The following hack attempts to deduce whether we're running on a
dual screen by looking at the aspect ratio of the screen dimensions
we obtained from GetClientRect. If the screen is more than twice
as wide as it is high, we conclude it's a dual screen system and
reduce the effective width by a half. This keeps us from blowing
up the screen saver image so large that it is highly probable to
span the crack between the two screens. */
dualscreen = windex.right > (windex.bottom * 2);
swid = dualscreen ? (windex.right / 4) : (windex.right / 2);
swid = min(swid, windex.bottom - (fChildPreview ? 0 : textHeight));
sheight = (swid / 2) + (fChildPreview ? 0 : textHeight);
/* Determine the placement of the image on the screen. If we have
guessed that this is a dual screen configuration, take care so
the image does not span the two screens (assuming they're the same
width. */
xoff = randInt(0, (dualscreen ? (windex.right / 2) : windex.right) - (swid + 1));
if (dualscreen && ((rand() & 0x400) != 0)) {
xoff += windex.right / 2;
}
yoff = randInt(0, windex.bottom - (sheight + 1)) + (fChildPreview ? 0 : textHeight);
windex.left += xoff;
windex.right = windex.left + swid;
windex.top += yoff;
windex.bottom = windex.top + (swid / 2);
}
#else
GetClientRect(hWnd, &windex);
#endif
if (repaint) {
HDC hdcMem;
HBITMAP hBitmap;
InvalidateCalculation(moonpos);
moonDisplayed = FALSE;
satDisplayed = FALSE;
if (blitMap) {
HANDLE obmap;
hdcMem = CreateCompatibleDC(hDC);
obmap = SelectObject(hdcMem, blitMap);
#ifdef ScreenSaver
{ RECT wi;
GetClientRect(hWnd, &wi);
FillRect(hDC, &wi, (HBRUSH) GetStockObject(BLACK_BRUSH));
}
#endif
BitBlt(hDC, windex.left, windex.top,
windex.right - windex.left, windex.bottom - windex.top,
hdcMem, 0, 0, SRCCOPY);
SelectObject(hdcMem, obmap);
DeleteDC(hdcMem);
} else {
if (DispMode >= 255) {
needImageBitmap();
}
// #define CHECKREGISTRATION
#ifndef CHECKREGISTRATION
else
#endif
{
{
HPEN dpen, oldPen;
HBRUSH dbrush;
RECT screct;
HBITMAP obmap;
/* The bitmap image of the Earth cannot be displayed or isn't desired.
Generate a a vector image by scaling our master vector database
to a bitmap of the proper size. */
invalidate_refresh();
hBitmap = CreateCompatibleBitmap(hDC, windex.right - windex.left,
windex.bottom - windex.top);
hdcMem = CreateCompatibleDC(hDC);
obmap = SelectObject(hdcMem, hBitmap);
blitMap = hBitmap;
dpen = CreatePen(PS_SOLID, 1, DispMode == 1 ? GetSysColor(COLOR_WINDOW) :
RGB(255, 255, 0));
dbrush = CreateSolidBrush(DispMode == 1 ? GetSysColor(COLOR_WINDOWTEXT) : RGB(0, 0, 255));
GetClientRect(hWnd, &screct);
#ifndef CHECKREGISTRATION
FillRect(hdcMem, &screct, dbrush);
#endif
DeleteObject(dbrush);
oldPen = SelectObject(hdcMem, dpen);
yieldYet = 0;
hhdc = hdcMem;
lx = ly = -1; /* Reset optimisation */
#ifdef POLLY
pLinel = 0;
#endif
mapdraw(windex.right - windex.left, windex.bottom - windex.top, drawvec);
#ifdef POLLY
if (pLinel > 0) {
Polyline(hdcMem, pLine, pLinel);
}
#endif
SelectObject(hdcMem, oldPen);
DeleteObject(dpen);
#ifdef ScreenSaver
{ RECT wi;
GetClientRect(hWnd, &wi);
FillRect(hDC, &wi, (HBRUSH) GetStockObject(BLACK_BRUSH));
}
#endif
BitBlt(hDC, windex.left, windex.top, windex.right - windex.left,
windex.bottom - windex.top, hdcMem, 0, 0, SRCCOPY);
SelectObject(hdcMem, obmap);
DeleteDC(hdcMem);
}
}
#ifdef CHECKREGISTRATION
{ time_t t;
t = time(NULL);
while ((time(NULL) - t) < 60) Yield();
}
#endif
}
updimage(hWnd, windex, hDC, FALSE, copyCat);
} else {
updimage(hWnd, windex, hDC, TRUE, copyCat);
}
#ifdef ScreenSaver
moonDisplayed = FALSE;
if (showmoon) {
updmoon(hWnd, hDC, windex, faketime);
}
/* Show and hide cursor to get around bug in Windows 3.1 that makes cursor
reappear after a StretchBlt. */
ShowCursor(TRUE);
ShowCursor(FALSE);
#else
if (viewFromFrustrated) {
satviewchanged();
}
#endif
}
/* PROJILLUM -- Project illuminated area on the map. */
static void projillum(short *wtab, int xdots, int ydots, double dec)
{
int i, ftf = TRUE, ilon, ilat, lilon, lilat, xt;
double m, x, y, z, th, lon, lat, s, c;
/* Clear unoccupied cells in width table */
for (i = 0; i < ydots; i++) {
wtab[i] = -1;
}
/* Build transformation for declination */
s = sin(-dtr(dec));
c = cos(-dtr(dec));
/* Increment over a semicircle of illumination */
for (th = -(PI / 2); th <= PI / 2 + 0.001; th += PI / TERMINC) {
/* Transform the point through the declination rotation. */
x = -s * sin(th);
y = cos(th);
z = c * sin(th);
/* Transform the resulting co-ordinate through the
map projection to obtain screen co-ordinates. */
lon = (y == 0 && x == 0) ? 0.0 : rtd(atan2(y, x));
lat = rtd(asin(z));
ilat = (int) (ydots - (lat + 90) * (ydots / 180.0));
ilon = (int) (lon * (xdots / 360.0));
if (ftf) {
/* First time. Just save start co-ordinate. */
lilon = ilon;
lilat = ilat;
ftf = FALSE;
} else {
/* Trace out the line and set the width table. */
if (lilat == ilat) {
wtab[(ydots - 1) - ilat] = 2 * (ilon == 0 ? 1 : ilon);
} else {
m = ((double) (ilon - lilon)) / (ilat - lilat);
for (i = lilat; i != ilat; i += sgn(ilat - lilat)) {
xt = (int) (lilon + floor((m * (i - lilat)) + 0.5));
wtab[(ydots - 1) - i] = 2 * (xt == 0 ? 1 : xt);
}
}
lilon = ilon;
lilat = ilat;
}
}
/* Now tweak the widths to generate full illumination for
the correct pole. */
if (dec < 0.0) {
ilat = ydots - 1;
lilat = -1;
} else {
ilat = 0;
lilat = 1;
}
for (i = ilat; i != ydots / 2; i += lilat) {
if (wtab[i] != -1) {
while (TRUE) {
wtab[i] = xdots;
if (i == ilat) {
break;
}
i -= lilat;
}
break;
}
}
}
/* XSPAN -- Complement a span of pixels. Called with line in which
pixels are contained, leftmost pixel in the line, and
the number of pixels to complement. Handles
wrap-around at the right edge of the screen. */
static void xspan(HDC hDC, RECT windex, int pline, int leftp, int npix)
{
leftp = leftp % xdots;
pline += windex.top;
if ((leftp + npix) > xdots) {
BitBlt(hDC, windex.left + leftp, pline, (xdots - leftp) - 1, 1, NULL, 0, 0, DSTINVERT);
BitBlt(hDC, windex.left, pline, ((leftp + npix) - xdots), 1, NULL, 0, 0, DSTINVERT);
} else {
BitBlt(hDC, windex.left + leftp, pline, npix, 1, NULL, 0, 0, DSTINVERT);
}
}
/* MOVETERM -- Update illuminated portion of the globe. */
static void moveterm(HDC hDC, RECT windex,
void (*cspan)(HDC hWnd, RECT windex, int pline, int leftp, int npix),
short *wtab, int noon,
short *otab, int onoon,
int xdots, int ydots,
int copyCat)
{
int i, j, ol, oh, nl, nh;
if (ImageMode) {
HPALETTE opal;
LPBITMAPINFOHEADER bh, bp;
WORD ncol, offbits;
int wid, hgt, bmode = DIB_RGB_COLORS;
unsigned char *pa;
bp = bh = (LPBITMAPINFOHEADER) LockResource(earthImageDIB);
ncol = (WORD) (bh->biClrUsed == 0 ? (1L << bh->biBitCount) : bh->biClrUsed);
offbits = (WORD) (bh->biSize + ncol * sizeof(RGBQUAD));
wid = ImageWid;
hgt = ImageHgt;
#define PixA(x, y) ((((unsigned char *) (bh)) + offbits + ((x) + (((DWORD) ((ImageHgt - 1) - (y))) * (((wid + (sizeof(LONG) - 1)) & (~(sizeof(LONG) - 1))))))))
#ifndef WINKY
for (i = 0; i < (int) hgt; i++) {
if (wtab[i] < 0) {
pa = PixA(0, i);
for (j = 0; j < wid; j++) {
*pa++ &= 0x7F;
}
} else {
/* If both the old and new spans were the entire
screen, they're equivalent. */
if ((otab[i] == wtab[i]) && (wtab[i] == wid)) {
continue;
}
pa = PixA(0, i);
for (j = 0; j < wid; j++) {
*pa++ &= 0x7F;
}
nl = ((noon - (wtab[i] / 2)) + wid) % wid;
nh = (nl + wtab[i]) - 1;
oh = (nh - nl) + 1;
if ((nl + oh) > wid) {
pa = PixA(nl, i);
for (j = nl; j < wid; j++) {
*pa++ |= 0x80;;
}
pa = PixA(0, i);
for (j = 0; j < (((nl + oh) - wid) + 1); j++) {
*pa++ |= 0x80;
}
} else {
pa = PixA(nl, i);
for (j = nl; j < ((nl + oh) + 1); j++) {
*pa++ |= 0x80;
}
}
}
otab[i] = wtab[i];
}
#endif // WINKY
#ifdef ScreenSaver
{ RECT wi;
GetClientRect(hMainWindow, &wi);
FillRect(hDC, &wi, (HBRUSH) GetStockObject(BLACK_BRUSH));
}
#endif
if (imagePal != NULL) {
opal = SelectPalette(hDC, imagePal, FALSE);
RealizePalette(hDC);
}
#ifdef PALIDX
bp = palMapStart(bh, &bmode);
#endif
if (!copyCat && (xdots - 1) == ImageWid && (ydots - 1) == ImageHgt) {
SetDIBitsToDevice(hDC, windex.left, windex.top, xdots - 1, ydots - 1,
0, 0, 0, ImageHgt,
((LPSTR) bh) + offbits, (LPBITMAPINFO) bp,
bmode);
} else {
#ifdef OLDWAY
int l;
SetStretchBltMode(hDC, COLORONCOLOR);
l = StretchDIBits(hDC, windex.left, windex.top, xdots, ydots,
0, 0, ImageWid, ImageHgt,
((LPSTR) bh) + offbits, (LPBITMAPINFO) bp,
bmode, SRCCOPY);
if (l == GDI_ERROR) {
StretchDIBits(hDC, windex.left, windex.top, xdots / 2, ydots,
0, 0, ImageWid / 2, ImageHgt,
((LPSTR) bh) + offbits, (LPBITMAPINFO) bp,
bmode, SRCCOPY);
StretchDIBits(hDC, windex.left + xdots / 2, windex.top, xdots / 2, ydots,
ImageWid / 2, 0, ImageWid / 2, ImageHgt,
((LPSTR) bh) + offbits, (LPBITMAPINFO) bp,
bmode, SRCCOPY);
}
#else
/* Hey hey kids! It's Crufty time again! Even on a machine with
384 megabytes of RAM, pointy-headed Windows 98 can't
stretch a large (1400 by 700 pixel) bitmap into a
similarly large full-colour screen area. So, we attempt
the stretch in one swell foop, and if it doesn't work, then
we try chopping the image into halves, quarters, eights,
etc. in the hope we'll be able to paint it in smaller
stripes. */
while (TRUE) {
int n, stat, swid, dwid, soff, doff;
SetStretchBltMode(hDC, COLORONCOLOR);
soff = doff = 0;
dwid = xdots / chunks;
swid = ImageWid / chunks;
for (n = 0; n < chunks; n++) {
stat = StretchDIBits(hDC, windex.left + doff, windex.top, dwid, ydots,
soff, 0, swid, ImageHgt,
((LPSTR) bh) + offbits, (LPBITMAPINFO) bp,
bmode, SRCCOPY);
if (stat == GDI_ERROR) {
break;
}
soff += swid;
doff += dwid;
}
if (stat != GDI_ERROR) {
break;
}
if (((dwid / 2) < 1) || ((swid / 2) < 1)) {
break; // Bail out if the situation is hopeless
}
chunks *= 2;
}
#endif
}
#ifdef PALIDX
palMapEnd();
#endif
UnlockResource(earthImageDIB);
if (imagePal != NULL) {
SelectPalette(hDC, opal, FALSE);
}
} else {
#ifndef WINKY
for (i = 0; i < (ydots - 1); i++) {
/* If line is off in new width table but is set in
the old table, clear it. */
if (wtab[i] < 0) {
if (otab[i] >= 0) {
(*cspan)(hDC, windex, i, ((onoon - (otab[i] / 2)) + xdots) % xdots,
otab[i]);
}
} else {
/* Line is on in new width table. If it was off in
the old width table, just draw it. */
if (otab[i] < 0) {
(*cspan)(hDC, windex, i, ((noon - (wtab[i] / 2)) + xdots) % xdots,
wtab[i]);
} else {
/* If both the old and new spans were the entire
screen, they're equivalent. */
if ((otab[i] == wtab[i]) && (wtab[i] == xdots)) {
continue;
}
/* The line was on in both the old and new width
tables. We must adjust the difference in the
span. */
ol = ((onoon - (otab[i] / 2)) + xdots) % xdots;
oh = (ol + otab[i]) - 1;
nl = ((noon - (wtab[i] / 2)) + xdots) % xdots;
nh = (nl + wtab[i]) - 1;
/* If spans are disjoint, erase old span and set
new span. */
if (oh < nl || nh < ol) {
(*cspan)(hDC, windex, i, ol, (oh - ol) + 1);
(*cspan)(hDC, windex, i, nl, (nh - nl) + 1);
} else {
/* Clear portion(s) of old span that extend
beyond end of new span. */
if (ol < nl) {
(*cspan)(hDC, windex, i, ol, nl - ol);
ol = nl;
}