From 3ebbd193dce0724e106ec9af627a3782676ae510 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@swtch.com>
Date: Mon, 3 Apr 2017 23:12:14 -0400
Subject: svgpic: new program to convert pic to svg

This is an experiment.
Like tpic it's a copy-and-paste fork of pic.

Change-Id: Ia22772bd5881c7904a6d8f8e0b46fde8cea89cbd
Reviewed-on: https://plan9port-review.googlesource.com/2920
Reviewed-by: Russ Cox <rsc@swtch.com>
---
 src/cmd/svgpic/movegen.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 src/cmd/svgpic/movegen.c

(limited to 'src/cmd/svgpic/movegen.c')

diff --git a/src/cmd/svgpic/movegen.c b/src/cmd/svgpic/movegen.c
new file mode 100644
index 00000000..5ff44d46
--- /dev/null
+++ b/src/cmd/svgpic/movegen.c
@@ -0,0 +1,86 @@
+#include	<stdio.h>
+#include	"pic.h"
+#include	"y.tab.h"
+
+obj *movegen(void)
+{
+	static double prevdx, prevdy;
+	int i, some;
+	double defx, defy, dx, dy;
+	obj *p;
+	obj *ppos;
+	static int xtab[] = { 1, 0, -1, 0 };	/* R=0, U=1, L=2, D=3 */
+	static int ytab[] = { 0, 1, 0, -1 };
+	Attr *ap;
+
+	defx = getfval("movewid");
+	defy = getfval("moveht");
+	dx = dy = some = 0;
+	for (i = 0; i < nattr; i++) {
+		ap = &attr[i];
+		switch (ap->a_type) {
+		case TEXTATTR:
+			savetext(ap->a_sub, ap->a_val.p);
+			break;
+		case SAME:
+			dx = prevdx;
+			dy = prevdy;
+			some++;
+			break;
+		case LEFT:
+			dx -= (ap->a_sub==DEFAULT) ? defx : ap->a_val.f;
+			some++;
+			hvmode = L_DIR;
+			break;
+		case RIGHT:
+			dx += (ap->a_sub==DEFAULT) ? defx : ap->a_val.f;
+			some++;
+			hvmode = R_DIR;
+			break;
+		case UP:
+			dy += (ap->a_sub==DEFAULT) ? defy : ap->a_val.f;
+			some++;
+			hvmode = U_DIR;
+			break;
+		case DOWN:
+			dy -= (ap->a_sub==DEFAULT) ? defy : ap->a_val.f;
+			some++;
+			hvmode = D_DIR;
+			break;
+		case TO:
+			ppos = ap->a_val.o;
+			dx = ppos->o_x - curx;
+			dy = ppos->o_y - cury;
+			some++;
+			break;
+		case BY:
+			ppos = ap->a_val.o;
+			dx = ppos->o_x;
+			dy = ppos->o_y;
+			some++;
+			break;
+		case FROM:
+		case AT:
+			ppos = ap->a_val.o;
+			curx = ppos->o_x;
+			cury = ppos->o_y;
+			break;
+		}
+	}
+	if (some) {
+		defx = dx;
+		defy = dy;
+	} else {
+		defx *= xtab[hvmode];
+		defy *= ytab[hvmode];
+	}
+	prevdx = defx;
+	prevdy = defy;
+	extreme(curx, cury);
+	curx += defx;
+	cury += defy;
+	extreme(curx, cury);
+	p = makenode(MOVE, 0);
+	dprintf("M %g %g\n", curx, cury);
+	return(p);
+}
-- 
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