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xgeneral.cpp
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/*
** Astrolog (Version 7.70) File: xgeneral.cpp
**
** IMPORTANT NOTICE: Astrolog and all chart display routines and anything
** not enumerated below used in this program are Copyright (C) 1991-2024 by
** Walter D. Pullen (Astara@msn.com, http://www.astrolog.org/astrolog.htm).
** Permission is granted to freely use, modify, and distribute these
** routines provided these credits and notices remain unmodified with any
** altered or distributed versions of the program.
**
** The main ephemeris databases and calculation routines are from the
** library SWISS EPHEMERIS and are programmed and copyright 1997-2008 by
** Astrodienst AG. Use of that source code is subject to license for Swiss
** Ephemeris Free Edition at https://www.astro.com/swisseph/swephinfo_e.htm.
** This copyright notice must not be changed or removed by any user of this
** program.
**
** Additional ephemeris databases and formulas are from the calculation
** routines in the program PLACALC and are programmed and Copyright (C)
** 1989,1991,1993 by Astrodienst AG and Alois Treindl (alois@astro.ch). The
** use of that source code is subject to regulations made by Astrodienst
** Zurich, and the code is not in the public domain. This copyright notice
** must not be changed or removed by any user of this program.
**
** The original planetary calculation routines used in this program have
** been copyrighted and the initial core of this program was mostly a
** conversion to C of the routines created by James Neely as listed in
** 'Manual of Computer Programming for Astrologers', by Michael Erlewine,
** available from Matrix Software.
**
** Atlas composed using data from https://www.geonames.org/ licensed under a
** Creative Commons Attribution 4.0 License. Time zone changes composed using
** public domain TZ database: https://data.iana.org/time-zones/tz-link.html
**
** The PostScript code within the core graphics routines are programmed
** and Copyright (C) 1992-1993 by Brian D. Willoughby (brianw@sounds.wa.com).
**
** More formally: 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 and inspiring, 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, a copy of which is in the
** LICENSE.HTM file included with Astrolog, and at http://www.gnu.org
**
** Initial programming 8/28-30/1991.
** X Window graphics initially programmed 10/23-29/1991.
** PostScript graphics initially programmed 11/29-30/1992.
** Last code change made 4/22/2024.
*/
#include "astrolog.h"
#ifdef GRAPH
/*
******************************************************************************
** Core Graphic Procedures.
******************************************************************************
*/
// Set the current color to use in drawing on the screen or bitmap array.
void DrawColor(KI col)
{
#ifdef WINANY
HPEN hpenT;
#endif
if (gi.fFile) {
#ifdef PS
if (gs.ft == ftPS) {
if (gi.kiCur != col) {
PsStrokeForce(); // Render existing path with current color
fprintf(gi.file, "%.2f %.2f %.2f c\n",
(real)RgbR(rgbbmp[col])/255.0, (real)RgbG(rgbbmp[col])/255.0,
(real)RgbB(rgbbmp[col])/255.0);
}
}
#endif
#ifdef META
if (gs.ft == ftWmf)
gi.kiLineDes = col;
#endif
#ifdef WIRE
if (gs.ft == ftWire)
gi.kiCur = col;
#endif
}
#ifdef X11
else
XSetForeground(gi.disp, gi.gc, rgbind[col]);
#endif
#ifdef WINANY
else {
if (gi.kiCur != col) {
hpenT = wi.hpen;
wi.hpen = CreatePen(PS_SOLID, gi.nScaleT
#ifdef WIN
* (1 + (gs.fThick && wi.hdcPrint != NULL))
#endif
, (COLORREF)rgbbmp[col]);
SelectObject(wi.hdc, wi.hpen);
if (hpenT != (HPEN)NULL)
DeleteObject(hpenT);
}
}
#endif
gi.kiCur = col;
}
// Set the current line thickness to use when drawing graphics charts.
void DrawThick(flag fThick)
{
#ifdef WIN
int kiCur;
#endif
if (fThick == gs.fThick)
return;
gs.fThick = fThick;
#ifdef WIN
if (!gi.fFile && wi.hdcPrint != NULL) {
// For Windows, reset pen width to reflect new thickness.
kiCur = gi.kiCur;
gi.kiCur = -1;
DrawColor(kiCur);
}
#endif
}
// Set a single point on the chart. This is the most basic graphic function
// and is called by all the more complex routines. Based on what mode are
// in, either set a cell in the bitmap array or a pixel on the window.
void DrawPoint(int x, int y)
{
#ifdef META
int n;
#endif
// Don't set points outside the bounds of the bitmap array.
if (!FOnWin(x, y))
return;
if (gi.fFile) {
if (gs.ft == ftBmp) {
if (!gi.fBmp) {
BmSet(gi.bm, x, y, gi.kiCur);
if (gs.fThick) {
if (x+1 < gs.xWin)
BmSet(gi.bm, x+1, y, gi.kiCur);
if (y+1 < gs.yWin) {
BmSet(gi.bm, x, y+1, gi.kiCur);
if (x+1 < gs.xWin)
BmSet(gi.bm, x+1, y+1, gi.kiCur);
}
}
} else {
BmpSetXY(&gi.bmp, x, y, rgbbmp[gi.kiCur]);
if (gs.fThick) {
if (x+1 < gs.xWin)
BmpSetXY(&gi.bmp, x+1, y, rgbbmp[gi.kiCur]);
if (y+1 < gs.yWin) {
BmpSetXY(&gi.bmp, x, y+1, rgbbmp[gi.kiCur]);
if (x+1 < gs.xWin)
BmpSetXY(&gi.bmp, x+1, y+1, rgbbmp[gi.kiCur]);
}
}
}
}
#ifdef PS
else if (gs.ft == ftPS) {
DrawColor(gi.kiCur);
PsLineCap(fTrue);
fprintf(gi.file, "%d %d d\n", x, y);
PsStroke(2);
}
#endif
#ifdef META
else if (gs.ft == ftWmf) {
gi.kiLineDes = gi.kiFillDes = gi.kiCur;
MetaSelect();
n = gi.nPenWid;
if (!gs.fThick) {
MetaEllipse(x-n, y-n, x+n*2, y+n*2);
} else {
MetaEllipse(x-n, y-n, x+n*3, y+n*3);
}
}
#endif
#ifdef WIRE
else
WirePoint(x, y, gi.zDefault);
#endif
}
#ifdef X11
else {
XDrawPoint(gi.disp, gi.pmap, gi.gc, x, y);
if (gs.fThick) {
XDrawPoint(gi.disp, gi.pmap, gi.gc, x+1, y);
XDrawPoint(gi.disp, gi.pmap, gi.gc, x, y+1);
XDrawPoint(gi.disp, gi.pmap, gi.gc, x+1, y+1);
}
}
#endif
#ifdef WIN
else {
if (wi.hdcPrint == hdcNil) {
SetPixel(wi.hdc, x, y, (COLORREF)rgbbmp[gi.kiCur]);
if (gs.fThick) {
SetPixel(wi.hdc, x+1, y, (COLORREF)rgbbmp[gi.kiCur]);
SetPixel(wi.hdc, x, y+1, (COLORREF)rgbbmp[gi.kiCur]);
SetPixel(wi.hdc, x+1, y+1, (COLORREF)rgbbmp[gi.kiCur]);
}
} else {
MoveTo(wi.hdc, x, y);
LineTo(wi.hdc, x+1, y);
}
}
#endif
#ifdef WCLI
else {
SetPixel(wi.hdc, x, y, (COLORREF)rgbbmp[gi.kiCur]);
if (gs.fThick) {
SetPixel(wi.hdc, x+1, y, (COLORREF)rgbbmp[gi.kiCur]);
SetPixel(wi.hdc, x, y+1, (COLORREF)rgbbmp[gi.kiCur]);
SetPixel(wi.hdc, x+1, y+1, (COLORREF)rgbbmp[gi.kiCur]);
}
}
#endif
}
// Draw dot a little larger than just a single pixel at specified location.
void DrawSpot(int x, int y)
{
#ifdef PS
if (gs.ft == ftPS) {
PsLineWidth((int)(gi.rLineWid*3.0));
DrawPoint(x, y);
PsLineWidth((int)(gi.rLineWid/3.0));
return;
}
#endif
#ifdef META
if (gs.ft == ftWmf) {
gi.kiLineDes = gi.kiFillDes = gi.kiCur;
MetaSelect();
MetaEllipse(x-gi.nPenWid*2, y-gi.nPenWid*2,
x+gi.nPenWid*(3 + gs.fThick), y+gi.nPenWid*(3 + gs.fThick));
return;
}
#endif
#ifdef WIRE
if (gs.ft == ftWire) {
WireLine(x-1, y, 0, x+1, y, 0);
WireLine(x, y-1, 0, x, y+1, 0);
return;
}
#endif
DrawPoint(x, y);
DrawPoint(x, y-1);
DrawPoint(x-1, y);
DrawPoint(x+1, y);
DrawPoint(x, y+1);
}
// Draw a filled in block, defined by the corners of its rectangle.
void DrawBlock(int x1, int y1, int x2, int y2)
{
int x, y;
if (gs.fThick) {
x2 += gi.nScaleT; y2 += gi.nScaleT;
}
if (gi.fFile) {
if (gs.ft == ftBmp) {
// Force the coordinates to be within the bounds of the bitmap array.
if (x1 < 0)
x1 = 0;
if (x2 >= gs.xWin)
x2 = gs.xWin-1;
if (y1 < 0)
y1 = 0;
else if (y2 >= gs.yWin)
y2 = gs.yWin-1;
// For bitmap, just fill in the array.
if (!gi.fBmp) {
for (y = y1; y <= y2; y++)
for (x = x1; x <= x2; x++)
BmSet(gi.bm, x, y, gi.kiCur);
} else {
for (y = y1; y <= y2; y++)
for (x = x1; x <= x2; x++)
BmpSetXY(&gi.bmp, x, y, rgbbmp[gi.kiCur]);
}
}
#ifdef PS
else if (gs.ft == ftPS) {
DrawColor(gi.kiCur);
fprintf(gi.file, "%d %d %d %d rf\n",
Max(x1-gi.nPenWid/4, 0), Max(y1-gi.nPenWid/4, 0),
x2-x1+gi.nPenWid/4, y2-y1+gi.nPenWid/4);
}
#endif
#ifdef META
else if (gs.ft == ftWmf) {
gi.kiFillDes = gi.kiCur;
MetaSelect();
MetaRectangle(x1-gi.nPenWid, y1-gi.nPenWid,
x2+gi.nPenWid, y2+gi.nPenWid);
}
#endif
#ifdef WIRE
else {
if (x1 == x2 || y1 == y2)
WireLine(x1, y1, 0, x2, y2, 0);
}
#endif
}
#ifdef X11
else
XFillRectangle(gi.disp, gi.pmap, gi.gc, x1, y1, x2-x1+1, y2-y1+1);
#endif
#ifdef WINANY
else {
wi.hbrush = CreateSolidBrush((COLORREF)rgbbmp[gi.kiCur]);
SelectObject(wi.hdc, wi.hbrush);
PatBlt(wi.hdc, x1, y1, x2-x1 + gi.nScaleT, y2-y1 + gi.nScaleT, PATCOPY);
SelectObject(wi.hdc, GetStockObject(NULL_BRUSH));
DeleteObject(wi.hbrush);
}
#endif
}
// Draw a rectangle on the screen with specified thickness. This is just like
// DrawBlock() except that are only drawing the edges of the area.
void DrawBox(int x1, int y1, int x2, int y2, int xsiz, int ysiz)
{
#ifdef META
if (gs.ft == ftWmf)
// For thin boxes in metafiles, can just output one rectangle record
// instead of drawing each side separately as have to do otherwise.
if (xsiz <= 1 && ysiz <= 1) {
gi.kiFillDes = kNull; // Specify a hollow fill brush.
MetaSelect();
MetaRectangle(x1, y1, x2, y2);
return;
}
#endif
#ifdef WIRE
if (gs.ft == ftWire) {
DrawLine(x1, y1, x2, y1);
DrawLine(x1, y1, x1, y2);
DrawLine(x2, y1, x2, y2);
DrawLine(x1, y2, x2, y2);
return;
}
#endif
DrawBlock(x1, y1, x2, y1 + ysiz - 1);
DrawBlock(x1, y1 + ysiz, x1 + xsiz - 1, y2 - ysiz);
DrawBlock(x2 - xsiz + 1, y1 + ysiz, x2, y2 - ysiz);
DrawBlock(x1, y2 - ysiz + 1, x2, y2);
}
// Given a specific character, coordinates, font index, character scale, and
// glyph index, adjust them with an AstroExpression if set.
#ifdef EXPRESS
void AdjustGlyph(int *ch, int *x, int *y, int *fi, int *nScale,
int i, char *szExpFont)
{
if (!(!us.fExpOff && FSzSet(szExpFont)))
return;
ExpSetN(iLetterU, i);
ExpSetN(iLetterV, *ch);
ExpSetN(iLetterW, *fi);
ExpSetN(iLetterX, *x);
ExpSetN(iLetterY, *y);
ExpSetN(iLetterZ, *nScale);
ParseExpression(szExpFont);
*ch = NExpGet(iLetterV);
*fi = NExpGet(iLetterW);
*x = NExpGet(iLetterX);
*y = NExpGet(iLetterY);
*nScale = NExpGet(iLetterZ);
}
#endif
#ifdef WINANY
// Draw an astrology character from a special font on the screen. Used to draw
// sign, planet, aspect, and Nakshatra glyphs from these fonts within charts.
flag DrawGlyph(int ch, int x, int y, int fi, int nScale)
{
HFONT hfont, hfontPrev;
SIZE size;
char sz[3];
WCHAR wz[2];
KV kvSav;
int cch = 1 + (fi == fiArial && ch < 0), nSav;
// Fonts: 1=Wingdings, 2=Astro, 3=EnigmaAstrology, 4=HamburgSymbols,
// 5=Astronomicon, 6=Courier New, 7=Consolas, 8=Arial, 9=HanksNakshatra
hfont = CreateFont(12*gi.nScale*nScale/100, 0, 0, 0, !gs.fThick ? 400 : 800,
fFalse, fFalse, fFalse, FBetween(fi, fiCourier, fiArial) ?
DEFAULT_CHARSET : (fi >= fiAstro && fi != fiNakshatr ? ANSI_CHARSET :
SYMBOL_CHARSET), OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, PROOF_QUALITY,
VARIABLE_PITCH | FF_DECORATIVE, rgszFontName[fi]);
if (hfont == NULL)
return fFalse;
hfontPrev = (HFONT)SelectObject(wi.hdc, hfont);
kvSav = GetTextColor(wi.hdc);
SetTextColor(wi.hdc, rgbbmp[gi.kiCur]);
nSav = SetBkMode(wi.hdc, TRANSPARENT);
if (FBetween(fi, fiCourier, fiArial) && cch <= 1) {
wz[0] = ch; wz[1] = chNull;
GetTextExtentPointW(wi.hdc, wz, cch, &size);
TextOutW(wi.hdc, x - (size.cx >> 1), y - (size.cy >> 1), wz, cch);
} else {
if (cch <= 1) {
sz[0] = ch; sz[1] = chNull;
} else
sprintf(sz, "%d", -ch);
GetTextExtentPoint(wi.hdc, sz, cch, &size);
TextOut(wi.hdc, x - (size.cx >> 1), y - (size.cy >> 1), sz, cch);
}
SetBkMode(wi.hdc, nSav);
SetTextColor(wi.hdc, kvSav);
SelectObject(wi.hdc, hfontPrev);
DeleteObject(hfont);
return fTrue;
}
// Clear and erase the entire graphics screen on Windows.
void WinClearScreen(KI ki)
{
wi.hbrush = CreateSolidBrush((COLORREF)rgbbmp[ki]);
SelectObject(wi.hdc, wi.hbrush);
PatBlt(wi.hdc, -gi.xOffset, -gi.yOffset, wi.xClient, wi.yClient, PATCOPY);
SelectObject(wi.hdc, GetStockObject(NULL_BRUSH));
DeleteObject(wi.hbrush);
}
#endif
// Clear and erase the graphics screen or bitmap contents.
void DrawClearScreen()
{
#ifdef PS
real rT;
if (gs.ft == ftPS) {
gs.nScale *= PSMUL; gs.xWin *= PSMUL; gs.yWin *= PSMUL; gi.nScale *= PSMUL;
// For PostScript charts first output page orientation information.
if (!gi.fEps) {
if (gs.nOrient == 0)
gs.nOrient = gs.xWin > gs.yWin ? -1 : 1;
if (gs.nOrient < 0) {
// Values chartx and charty are reversed for Landscape mode.
rT = gs.xInch/(real)gs.yWin < gs.yInch/(real)gs.xWin ?
gs.xInch*72.0/(real)gs.yWin : gs.yInch*72.0/(real)gs.xWin;
fprintf(gi.file, "%d %d translate\n",
(int)(gs.xInch*72.0 + gs.yWin*rT)/2,
(int)(gs.yInch*72.0 + gs.xWin*rT)/2);
fprintf(gi.file, "-90 rotate\n");
} else {
// Most charts are in Portrait mode.
rT = gs.xInch/(real)gs.xWin < gs.yInch/(real)gs.yWin ?
gs.xInch*72.0/(real)gs.xWin : gs.yInch*72.0/(real)gs.yWin;
fprintf(gi.file, "%d %d translate\n",
(int)(gs.xInch*72.0 - gs.xWin*rT)/2,
(int)(gs.yInch*72.0 + gs.yWin*rT)/2);
}
} else {
fprintf(gi.file, "0 %d translate\n", gs.yWin);
rT = 1.0 / (real)PSMUL;
}
fprintf(gi.file, "1 -1 scale\n");
fprintf(gi.file, "%f dup scale\n", rT);
}
#endif
#ifdef META
if (gs.ft == ftWmf)
MetaInit(); // For metafiles first go write header information.
#endif
// Don't actually erase the screen if the -Xj switch is in effect.
if (gs.fJetTrail)
return;
DrawColor(gi.kiOff);
#ifdef WINANY
// For Windows charts clear entire window, not just the chart area.
if (!gi.fFile)
WinClearScreen(gi.kiCur);
else
#endif // WINANY
DrawBlock(0, 0, gs.xWin - 1, gs.yWin - 1); // Clear bitmap screen.
}
// Draw a line on the screen, specified by its endpoints. In addition, there
// is a specified a skip factor, which allows drawing dashed lines.
void DrawDash(int x1, int y1, int x2, int y2, int skip)
{
int x = x1, y = y1, i = 0,
dx = x2 - x1, dy = y2 - y1, xInc, yInc, xInc2, yInc2, d, dInc, z, zMax;
if (skip < 0)
skip = 0;
else if (skip > 0) {
if (gs.fThick)
skip++;
if (gs.nDashMax >= 0 && skip > gs.nDashMax)
skip = gs.nDashMax;
}
#ifdef ISG
if (!gi.fFile) {
if (!skip) {
#ifdef X11
// For non-dashed X window lines, have the Xlib do it.
XDrawLine(gi.disp, gi.pmap, gi.gc, x1, y1, x2, y2);
// Some XDrawLine implementations don't draw the last pixel.
XDrawPoint(gi.disp, gi.pmap, gi.gc, x2, y2);
if (gs.fThick) {
// Make the line thicker by drawing it four times.
XDrawLine(gi.disp, gi.pmap, gi.gc, x1+1, y1, x2+1, y2);
XDrawLine(gi.disp, gi.pmap, gi.gc, x1, y1+1, x2, y2+1);
XDrawLine(gi.disp, gi.pmap, gi.gc, x1+1, y1+1, x2+1, y2+1);
XDrawPoint(gi.disp, gi.pmap, gi.gc, x2+1, y2);
XDrawPoint(gi.disp, gi.pmap, gi.gc, x2, y2+1);
XDrawPoint(gi.disp, gi.pmap, gi.gc, x2+1, y2+1);
}
#endif
#ifdef WINANY
MoveTo(wi.hdc, x1, y1);
LineTo(wi.hdc, x2, y2);
#ifdef WIN
if (wi.hdcPrint != NULL)
return;
#endif
if (!gs.fThick) {
// For Windows lines, have to manually draw the last pixel.
SetPixel(wi.hdc, x2, y2, (COLORREF)rgbbmp[gi.kiCur]);
} else {
// Make the line thicker by drawing it four times.
LineTo(wi.hdc, x2+1, y2);
LineTo(wi.hdc, x1+1, y1);
LineTo(wi.hdc, x1, y1+1);
LineTo(wi.hdc, x2, y2+1);
LineTo(wi.hdc, x2+1, y2+1);
LineTo(wi.hdc, x1+1, y1+1);
LineTo(wi.hdc, x1, y1);
}
#endif
return;
}
#ifdef WIN
if (skip && wi.hdcPrint != hdcNil)
skip = (skip + 1)*METAMUL - 1;
#endif
}
#endif // ISG
#ifdef PS
if (gs.ft == ftPS) {
// For PostScript charts can save file size if we output a LineTo command
// when the start vertex is the same as the end vertex of the previous
// line drawn, instead of writing out both vertices.
PsLineCap(fTrue);
PsDash(skip);
if (gi.xPen != x1 || gi.yPen != y1)
fprintf(gi.file, "%d %d %d %d l\n", x1, y1, x2, y2);
else
fprintf(gi.file, "%d %d t\n", x2, y2);
gi.xPen = x2; gi.yPen = y2;
PsStroke(2);
return;
}
#endif
#ifdef META
if (gs.ft == ftWmf) {
// For metafile charts can save file size for consecutive lines sharing
// endpoints by consolidating them into a PolyLine.
if (gi.xPen != x1 || gi.yPen != y1) {
if (x1 != x2 || y1 != y2) {
gi.kiLineDes = (gi.kiLineDes & 15) + 16*(skip > 3 ? 3 : skip);
MetaSelect();
gi.pwPoly = gi.pwMetaCur;
gi.kiPoly = gi.kiCur;
MetaRecord(8, 0x325); // Polyline
MetaWord(2); MetaWord(x1); MetaWord(y1);
} else {
DrawPoint(x1, y1);
MetaPoint(x1, y1, rgbbmp[gi.kiCur]);
return;
}
} else {
*gi.pwPoly += 2;
(*(gi.pwPoly+3))++;
// Note: Technically should update the max record size in the file
// header here too, but it doesn't seem necessary.
}
MetaWord(x2); MetaWord(y2);
gi.xPen = x2; gi.yPen = y2;
return;
}
#endif
#ifdef WIRE
if (gs.ft == ftWire) {
// Solid non-dashed lines are supported in wireframe format.
if (skip == 0) {
WireLine(x1, y1, gi.zDefault, x2, y2, gi.zDefault);
return;
}
}
#endif
// If none of the above cases hold, then have to draw line dot by dot.
// Determine slope.
if (NAbs(dx) >= NAbs(dy)) {
xInc = NSgn(dx); yInc = 0;
xInc2 = 0; yInc2 = NSgn(dy);
zMax = NAbs(dx); dInc = NAbs(dy);
d = zMax - (!FOdd(dx) && x1 > x2);
} else {
xInc = 0; yInc = NSgn(dy);
xInc2 = NSgn(dx); yInc2 = 0;
zMax = NAbs(dy); dInc = NAbs(dx);
d = zMax - (!FOdd(dy) && y1 > y2);
}
d >>= 1;
// Loop over long axis, adjusting short axis for slope as needed.
for (z = 0; z <= zMax; z++) {
if (i < 1)
DrawPoint(x, y);
i = i < skip ? i+1 : 0;
x += xInc; y += yInc; d += dInc;
if (d >= zMax) {
x += xInc2; y += yInc2; d -= zMax;
}
}
}
// Draw a normal line on the screen, however if the x coordinates are close to
// either of the two given bounds, then assume that the line runs off one side
// and reappears on the other, so draw the appropriate two lines instead. This
// is used by the Ley line and astro-graph routines, which draw lines running
// around the world and hence off the edges of the maps.
void DrawWrap(int x1, int y1, int x2, int y2, int xmin, int xmax)
{
int xmid, ymid, i, j, k;
if (x1 < 0) { // Special case for drawing world map.
DrawPoint(x2, y2);
return;
}
j = (xmin < 0); // Negative xmin means always draw forward.
if (j)
neg(xmin);
xmid = (xmax-xmin) / 2;
if (j)
k = (x1 < x2 ? xmid*7 : xmid)/4;
else
k = xmid;
// If endpoints aren't near opposite edges, just draw the line and return.
if (NAbs(x2-x1) < k) {
DrawLine(x1, y1, x2, y2);
return;
}
if ((i = (xmax-xmin+1) + (!j && x1 < xmid ? x1-x2 : x2-x1)) == 0)
i = 1;
// Determine vertical coordinate where our line runs off edges of screen.
ymid = y1+(int)((real)(y2-y1)*
(!j && x1 < xmid ? (real)(x1-xmin) : (real)(xmax-x1))/(real)i + rRound);
DrawLine(x1, y1, !j && x1 < xmid ? xmin : xmax, ymid);
DrawLine(j || x2 < xmid ? xmin : xmax, ymid, x2, y2);
}
// This routine, and its companion below, clips a line defined by its
// endpoints to either above some line y=c, or below some line y=c. By
// passing in parameters in different orders, can clip to vertical lines
// too. These are used by the FDrawClip() routine below.
void ClipLesser(int *x1, int *y1, int *x2, int *y2, int s)
{
if (*y2 - *y1)
*x1 -= NMultDiv(*y1 - s, *x2 - *x1, *y2 - *y1);
*y1 = s;
}
void ClipGreater(int *x1, int *y1, int *x2, int *y2, int s)
{
if (*y2 - *y1)
*x1 += NMultDiv(s - *y1, *x2 - *x1, *y2 - *y1);
*y1 = s;
}
// Draw a line on the screen. This is just like DrawLine() routine earlier,
// however first clip the endpoints to the given viewport before drawing.
// Return true if some clipping was done, or false if entire line fits within
// viewport or if entire line is outside of viewport and nothing at all drawn.
flag FDrawClip(int x1, int y1, int x2, int y2, int xl, int yl, int xh, int yh,
int skip, int *x0, int *y0)
{
if ((x1 < xl && x2 < xl) || (y1 < yl && y2 < yl) || // Skip if outside
(x1 > xh && x2 > xh) || (y1 > yh && y2 > yh)) // bounding box.
return fFalse;
if (x1 < xl)
ClipLesser (&y1, &x1, &y2, &x2, xl); // Check left side of window.
if (x2 < xl)
ClipLesser (&y2, &x2, &y1, &x1, xl);
if (y1 < yl)
ClipLesser (&x1, &y1, &x2, &y2, yl); // Check top side of window.
if (y2 < yl)
ClipLesser (&x2, &y2, &x1, &y1, yl);
if (x1 > xh)
ClipGreater(&y1, &x1, &y2, &x2, xh); // Check right of window.
if (x2 > xh)
ClipGreater(&y2, &x2, &y1, &x1, xh);
if (y1 > yh)
ClipGreater(&x1, &y1, &x2, &y2, yh); // Check bottom of window.
if (y2 > yh)
ClipGreater(&x2, &y2, &x1, &y1, yh);
if (x1 < xl || x2 < xl || y1 < yl || y2 < yl || // Skip if not inside
x1 > xh || x2 > xh || y1 > yh || y2 > yh) // bounding box.
return fFalse;
DrawDash(x1, y1, x2, y2, skip); // Go draw the line.
// Return coordinates at which drawn line crosses bounding box.
if (x0 != NULL) {
if (x1 == xl || x1 == xh || y1 == yl || y1 == yh) {
*x0 = x1; *y0 = y1;
return fTrue;
}
if (x2 == xl || x2 == xh || y2 == yl || y2 == yh) {
*x0 = x2; *y0 = y2;
return fTrue;
}
}
return fFalse;
}
// Fast version of rotating that assumes the slow trigonometry values have
// already been computed. Useful when rotating many points by the same angle.
#define RotateR2(x1, y1, x2, y2, rS, rC) x2 = (x1)*(rC) - (y1)*(rS); \
y2 = (y1)*(rC) + (x1)*(rS)
#define RotateR2Init(rS, rC, d) rS = RSinD(d); rC = RCosD(d)
// Draw a circle or ellipse inside the given bounding rectangle. Extra
// parameters allow the ellipse to be rotated, or a subarc to be drawn.
void DrawArc(int x1, int y1, int x2, int y2, real rRotate, real t1, real t2)
{
int x, y, rx, ry, m, n, u, v, i, di;
real rS, rC, dx, dy, dx2, dy2, dt, t;
if (gi.fFile || rRotate != 0.0) {
x = (x1+x2)/2; y = (y1+y2)/2; rx = (x2-x1)/2; ry = (y2-y1)/2;
if (gs.ft == ftBmp || gs.ft == ftWire || rRotate != 0.0) {
RotateR2Init(rS, rC, rRotate);
dt = (t2 - t1) / rDegMax;
i = NAbs(rx) + NAbs(ry);
di = 2 + (i < 90) + (i < 72) + (i < 60) + (i < 40);
for (i = 0; i <= nDegMax; i += di) {
t = t1 + dt*(real)i;
dx = ((real)rx+rRound) * RCosD(t);
dy = ((real)ry+rRound) * RSinD(t);
if (rRotate != 0.0) {
// Fast rotation if doing a rotated ellipse.
RotateR2(dx, dy, dx2, dy2, rS, rC);
} else {
dx2 = dx; dy2 = dy;
}
u = x + (int)dx2; v = y + (int)dy2;
if (i > 0)
DrawLine(m, n, u, v);
m = u; n = v;
}
}
#ifdef PS
else if (gs.ft == ftPS) {
PsLineCap(fFalse);
PsStrokeForce();
PsDash(0);
fprintf(gi.file, "%d %d %d %d el\n", rx, ry, x, y);
}
#endif
#ifdef META
else {
gi.kiFillDes = kNull; // Specify a hollow fill brush.
MetaSelect();
MetaEllipse(x1, y1, x2+gi.nPenWid*2, y2+gi.nPenWid*2);
}
#endif
}
#ifdef X11
else {
i = nDegMax*64;
XDrawArc(gi.disp, gi.pmap, gi.gc, x1, y1, x2-x1, y2-y1, 0, i);
if (gs.fThick) {
// Make the ellipse thicker by drawing it four times.
XDrawArc(gi.disp, gi.pmap, gi.gc, x1+1, y1, x2-x1, y2-y1, 0, i);
XDrawArc(gi.disp, gi.pmap, gi.gc, x1, y1+1, x2-x1, y2-y1, 0, i);
XDrawArc(gi.disp, gi.pmap, gi.gc, x1+1, y1+1, x2-x1, y2-y1, 0, i);
}
}
#endif
#ifdef WINANY
else {
Ellipse(wi.hdc, x1, y1, x2+1, y2+1);
#ifdef WIN
if (wi.hdcPrint != NULL)
return;
#endif
if (gs.fThick) {
// Make the ellipse thicker by drawing it four times.
Ellipse(wi.hdc, x1+1, y1, x2+2, y2+1);
Ellipse(wi.hdc, x1, y1+1, x2+1, y2+2);
Ellipse(wi.hdc, x1+1, y1+1, x2+2, y2+2);
}
}
#endif
}
// Draw a filled in circle or ellipse inside a bounding rectangle.
void DrawEllipse2(int x1, int y1, int x2, int y2)
{
int rx, ry, r, i, j, iT, jT, q, qLo, qHi, m1, m2, n1, n2, x, y;
if (gi.fFile) {
x = (x1 + x2) >> 1; y = (y1 + y2) >> 1;
rx = NAbs(x2 - x1) >> 1; ry = NAbs(y2 - y1) >> 1;
if (gs.ft == ftBmp || gs.ft == ftWire) {
// This efficient algorithm has no calculations more complicated than
// addition (and multiplication to proportion in case of an ellipse).
if (rx == 0 || ry == 0) {
DrawBlock(x1, y1, x2, y2);
return;
}
r = Max(rx, ry);
j = r; q = r+1; qLo = 1; qHi = r+r-1;
m1 = (x1 + x2) >> 1; m2 = m1 + FOdd(x2 - x1);
n1 = (y1 + y2) >> 1; n2 = n1 + FOdd(y2 - y1);
for (i = 0; i <= r; i++) {
iT = (rx <= ry) ? i : i * ry / rx;
jT = (rx >= ry) ? j : j * rx / ry;
DrawLineX(m1 - jT, m2 + jT, n1 - iT);
DrawLineX(m1 - jT, m2 + jT, n2 + iT);
q -= qLo;
while (q < 0) {
q += qHi;
qHi -= 2;
j--;
}
qLo += 2;
}
}
#ifdef PS
else if (gs.ft == ftPS) {
PsLineCap(fFalse);
PsStrokeForce();
PsDash(0);
fprintf(gi.file, "%d %d %d %d ef\n", rx, ry, x, y);
}
#endif
#ifdef META
else {
gi.kiFillDes = gi.kiCur; // Specify a solid fill brush.
MetaSelect();
MetaEllipse(x1+gi.nPenWid/3, y1+gi.nPenWid/3,
x2+1+gi.nPenWid/3, y2+1+gi.nPenWid/3);
}
#endif
}
#ifdef X11
else
XFillArc(gi.disp, gi.pmap, gi.gc, x1, y1, x2-x1, y2-y1, 0, nDegMax*64);
#endif
#ifdef WINANY
else {
wi.hbrush = CreateSolidBrush((COLORREF)rgbbmp[gi.kiCur]);
SelectObject(wi.hdc, wi.hbrush);
Ellipse(wi.hdc, x1, y1, x2+1, y2+1);
SelectObject(wi.hdc, GetStockObject(NULL_BRUSH));
DeleteObject(wi.hbrush);
}
#endif
}
// Draw a filled in circle or ellipse inside a bounding rectangle, which has
// a proportion of it in phase or shadow, like a crescent Moon. The phased
// part may be rotated by the specified number of degrees.
void DrawCrescent(int x1, int y1, int x2, int y2, real rProp, real rRotate,
KI ki0, KI ki1)
{
real xc, yc, rSq, dxy, rx, ry, dx, dy, dx2, dy2, rS, rC;
int x, y, xPrev;
KI ki, kiPrev;
// Can only draw up to a half Moon crescent. Any greater means to draw a
// crescent coming in from the inverse angle with the two colors reversed.
if (rProp <= 0.5)
rProp = 1.0 - rProp*2.0;
else {
rProp = (rProp - 0.5)*2.0;
rRotate += rDegHalf;
SwapN(ki0, ki1);
}
// Initialize variables.
xc = (real)(x1 + x2) / 2.0; yc = (real)(y1 + y2) / 2.0;
rx = (real)(x2 - x1) / 2.0; ry = (real)(y2 - y1) / 2.0;
rSq = Sq(rx) + rx/2.0;
dxy = rx / ry;
RotateR2Init(rS, rC, rRotate);
x1 = Max(x1, 0); x2 = Min(x2, gs.xWin-1);
y1 = Max(y1, 0); y2 = Min(y2, gs.yWin-1);
// Draw one row of the ellipse at a time.
for (y = y1; y <= y2; y++) {
xPrev = ki = kiPrev = ~0;
for (x = x1; x <= x2; x++) {
dx = (real)x - xc;
dy = (real)y - yc;
if (rx != ry)
dy *= dxy;
if (Sq(dx) + Sq(dy) > rSq) {
if (xPrev != ~0)
break;
continue;
}
if (rRotate != 0.0) {
// Fast rotation if doing a rotated ellipse.
RotateR2(dx, dy, dx2, dy2, rS, rC);
} else {
dx2 = dx; dy2 = dy;
}
ki = ki1;
if (dx2 > 0.0) {
dx2 /= rProp;
if (Sq(dx2) + Sq(dy2) > rSq)
ki = ki0;
}
// Don't draw anything in this row until the color changes.
if (xPrev == ~0)
xPrev = x;
if (kiPrev == ~0)
kiPrev = ki;
if (ki != kiPrev) {
DrawColor(kiPrev);
DrawLineX(xPrev, x-1, y);
kiPrev = ki;
xPrev = x;
}
}
// Draw the rest of the color in this row, if any.
if (ki != ~0) {
DrawColor(ki);
DrawLineX(xPrev, x-1, y);
}