From 8a3b2ceb0ff632c47e1516d3ffef8572dc8eb974 Mon Sep 17 00:00:00 2001
From: rsc <devnull@localhost>
Date: Sat, 24 Apr 2004 17:05:43 +0000
Subject: Add scat.  Temporary fix to rc r.e. note groups.

---
 src/cmd/scat/image.c | 158 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 158 insertions(+)
 create mode 100644 src/cmd/scat/image.c

(limited to 'src/cmd/scat/image.c')

diff --git a/src/cmd/scat/image.c b/src/cmd/scat/image.c
new file mode 100644
index 00000000..e61f0106
--- /dev/null
+++ b/src/cmd/scat/image.c
@@ -0,0 +1,158 @@
+#include	<u.h>
+#include	<libc.h>
+#include	<bio.h>
+#include	"sky.h"
+
+char	rad28[] = "0123456789abcdefghijklmnopqr";
+
+Picture*
+image(Angle ra, Angle dec, Angle wid, Angle hig)
+{
+	Pix *p;
+	uchar *b, *up;
+	int i, j, sx, sy, x, y;
+	char file[50];
+	Picture *pic;
+	Img* ip;
+	int lowx, lowy, higx, higy;
+	int slowx, slowy, shigx, shigy;
+	Header *h;
+	Angle d, bd;
+	Plate *pp, *bp;
+
+	if(gam.gamma == 0)
+		gam.gamma = -1;
+	if(gam.max == gam.min) {
+		gam.max = 17600;
+		gam.min = 2500;
+	}
+	gam.absgamma = gam.gamma;
+	gam.neg = 0;
+	if(gam.absgamma < 0) {
+		gam.absgamma = -gam.absgamma;
+		gam.neg = 1;
+	}
+	gam.mult1 = 1. / (gam.max - gam.min);
+	gam.mult2 = 255. * gam.mult1;
+
+	if(nplate == 0)
+		getplates();
+
+	bp = 0;
+	bd = 0;
+	for(i=0; i<nplate; i++) {
+		pp = &plate[i];
+		d = dist(ra, dec, pp->ra, pp->dec);
+		if(bp == 0 || d < bd) {
+			bp = pp;
+			bd = d;
+		}
+	}
+
+	if(debug)
+		Bprint(&bout, "best plate: %s %s disk %d %s\n",
+			hms(bp->ra), dms(bp->dec),
+			bp->disk, bp->rgn);
+
+	h = getheader(bp->rgn);
+	xypos(h, ra, dec, 0, 0);
+	if(wid <= 0 || hig <= 0) {
+		lowx = h->x;
+		lowy = h->y;
+		lowx = (lowx/500) * 500;
+		lowy = (lowy/500) * 500;
+		higx = lowx + 500;
+		higy = lowy + 500;
+	} else {
+		lowx = h->x - wid*ARCSECONDS_PER_RADIAN*1000 /
+			(h->param[Pxpixelsz]*h->param[Ppltscale]*2);
+		lowy = h->y - hig*ARCSECONDS_PER_RADIAN*1000 /
+			(h->param[Pypixelsz]*h->param[Ppltscale]*2);
+		higx = h->x + wid*ARCSECONDS_PER_RADIAN*1000 /
+			(h->param[Pxpixelsz]*h->param[Ppltscale]*2);
+		higy = h->y + hig*ARCSECONDS_PER_RADIAN*1000 /
+			(h->param[Pypixelsz]*h->param[Ppltscale]*2);
+	}
+	free(h);
+
+	if(lowx < 0) lowx = 0;
+	if(higx < 0) higx = 0;
+	if(lowy < 0) lowy = 0;
+	if(higy < 0) higy = 0;
+	if(lowx > 14000) lowx = 14000;
+	if(higx > 14000) higx = 14000;
+	if(lowy > 14000) lowy = 14000;
+	if(higy > 14000) higy = 14000;
+
+	if(debug)
+		Bprint(&bout, "xy on plate: %d,%d %d,%d\n",
+			lowx,lowy, higx, higy);
+
+	if(lowx >= higx || lowy >=higy) {
+		Bprint(&bout, "no image found\n");
+		return 0;
+	}
+
+	b = malloc((higx-lowx)*(higy-lowy)*sizeof(*b));
+	if(b == 0) {
+ emalloc:
+		fprint(2, "malloc error\n");
+		return 0;
+	}
+	memset(b, 0, (higx-lowx)*(higy-lowy)*sizeof(*b));
+
+	slowx = lowx/500;
+	shigx = (higx-1)/500;
+	slowy = lowy/500;
+	shigy = (higy-1)/500;
+
+	for(sx=slowx; sx<=shigx; sx++)
+	for(sy=slowy; sy<=shigy; sy++) {
+		if(sx < 0 || sx >= nelem(rad28) || sy < 0 || sy >= nelem(rad28)) {
+			fprint(2, "bad subplate %d %d\n", sy, sx);
+			free(b);
+			return 0;
+		}
+		sprint(file, "%s/%s/%s.%c%c",
+			dssmount(bp->disk),
+			bp->rgn, bp->rgn,
+			rad28[sy],
+			rad28[sx]);
+
+		ip = dssread(file);
+		if(ip == 0) {
+			fprint(2, "can't read %s: %r\n", file);
+			free(b);
+			return 0;
+		}
+
+		x = sx*500;
+		y = sy*500;
+		for(j=0; j<ip->ny; j++) {
+			if(y+j < lowy || y+j >= higy)
+				continue;
+			p = &ip->a[j*ip->ny];
+			up = b + (higy - (y+j+1))*(higx-lowx) + (x - lowx);
+			for(i=0; i<ip->nx; i++) {
+				if(x+i >= lowx && x+i < higx)
+					*up = dogamma(*p);
+				up++;
+				p += 1;
+			}
+		}
+		free(ip);
+	}
+
+	pic = malloc(sizeof(Picture));
+	if(pic == 0){
+		free(b);
+		goto emalloc;
+	}
+	pic->minx = lowx;
+	pic->miny = lowy;
+	pic->maxx = higx;
+	pic->maxy = higy;
+	pic->data = b;
+	strcpy(pic->name, bp->rgn);
+	return pic;
+}
-- 
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