cameo/: move conversion between poly2d and "struct path" from area-poly2d.c to poly2d.c

Untested.

cameo/Makefile

@@ -15,8 +15,8 @@ PREFIX ?= /usr/local
 SHELL=/bin/bash
 
 MAIN=cameo
-OBJS=cameo.o excellon.o area-poly2d.o gerber.o gnuplot.o ops.o path.o shape.o \
-     lex.yy.o y.tab.o
+OBJS=cameo.o excellon.o area-poly2d.o gerber.o gnuplot.o ops.o path.o \
+     poly2d.o shape.o lex.yy.o y.tab.o
 
 CFLAGS_WARN=-Wall -Wshadow -Wmissing-prototypes \
             -Wmissing-declarations -Wno-format-zero-length

cameo/area-poly2d.c

@@ -12,7 +12,7 @@
 
 #include <math.h>
 
-#include <poly2d.h>
+#include "poly2d.h"
 
 #include "path.h"
 #include "area.h"
@@ -22,46 +22,22 @@ static void fill_path(const struct path *paths, double z, double overlap,
     struct path ***res)
 {
 	const struct path *path;
-	const struct point *p;
-	double r_tool;
-	struct p2d *polys = NULL, *poly, *last = NULL;
+	double r_tool = 0;
+	struct p2d *polys;
 	struct p2d *fill;
-	const struct v2d *v;
 
-	for (path = paths; path; path = path->next) {
-		if (path->first->z != z)
-			continue;
-		if (!path->first || !path->first->next)
-			continue;
+	for (path = paths; path; path = path->next)
+		if (path->first && path->first->z == z)
 			r_tool = path->r_tool;
 
-		poly = p2d_new();
-		if (last)
-			last->next = poly;
-		else
-			polys = poly;
-		last = poly;
-		for (p = path->first; p && p->next; p = p->next)
-			p2d_append(poly, v2d_new(p->x, p->y));
-		p2d_close(poly);
-	}
+	polys = paths_to_polys_z(paths, z, z);
 
 	fill = p2d_area(polys, r_tool, 2*r_tool-overlap);
 	p2d_free_all(polys);
 
-	for (poly = fill; poly; poly = poly->next) {
-		**res = path_new(r_tool, "");
-		v = poly->v;
-		while (v) {
-			path_add(**res, v->x, v->y, z);
-			v = v->next;
-			if (v == poly->v)
-				break;
-		}
-		if (v)
-			path_add(**res, v->x, v->y, z);
+	**res = polys_to_paths(fill, r_tool, z);
+	while (**res)
 		*res = &(**res)->next;
-	}
 	p2d_free_all(fill);
 }
 

cameo/poly2d.c

@@ -0,0 +1,90 @@
+/*
+ * poly2d.c - Poly2D interface functions
+ *
+ * Written 2012 by Werner Almesberger
+ * Copyright 2012 Werner Almesberger
+ *
+ * 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.
+ */
+
+
+#include <math.h>
+#include <assert.h>
+
+#include "path.h"
+#include "poly2d.h"
+
+
+struct p2d *path_to_poly(const struct path *path)
+{
+	struct p2d *poly;
+	const struct point *p;
+
+	if (!path->first || !path->first->next)
+		return NULL;
+
+	poly = p2d_new();
+	for (p = path->first; p && p->next; p = p->next)
+		p2d_append(poly, v2d_new(p->x, p->y));
+	if (path_is_closed(path))
+		p2d_close(poly);
+	return poly;
+}
+
+
+struct p2d *paths_to_polys_z(const struct path *paths, 
+    double zmin, double zmax)
+{
+	struct p2d *polys = NULL, **last = &polys;
+	const struct path *path;
+
+	assert(zmin <= zmax);
+	for (path = paths; path; path = path->next) {
+		if (path->first->z < zmin || path->first->z > zmax)
+			continue;
+		*last = path_to_poly(path);
+		last = &(*last)->next;
+	}
+	return polys;
+}
+
+
+struct p2d *paths_to_polys(const struct path *paths)
+{
+	return paths_to_polys_z(paths, -HUGE_VAL, HUGE_VAL);
+}
+
+
+struct path *poly_to_path(const struct p2d *poly, double r_tool, double z)
+{
+	struct path *path;
+	const struct v2d *v;
+
+	path = path_new(r_tool, "");
+	v = poly->v;
+	while (v) {
+		path_add(path, v->x, v->y, z);
+		v = v->next;
+		if (v == poly->v)
+			break;
+	}
+	if (v)
+		path_add(path, v->x, v->y, z);
+	return path;
+}
+
+
+struct path *polys_to_paths(const struct p2d *polys, double r_tool, double z)
+{
+	struct path *paths = NULL, **last = &paths;
+	const struct p2d *poly;
+
+	for (poly = polys; poly; poly = poly->next) {
+		*last = poly_to_path(poly, r_tool, z);
+		last = &(*last)->next;
+	}
+	return paths;
+}

cameo/poly2d.h

@@ -0,0 +1,29 @@
+/*
+ * poly2d.h - Poly2D interface functions
+ *
+ * Written 2012 by Werner Almesberger
+ * Copyright 2012 Werner Almesberger
+ *
+ * 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.
+ */
+
+
+#ifndef POLY2D_H
+
+#include <poly2d.h>
+
+#include "path.h"
+
+
+struct p2d *path_to_poly(const struct path *path);
+struct p2d *paths_to_polys_z(const struct path *paths,
+    double zmin, double zmax);
+struct p2d *paths_to_polys(const struct path *paths);
+
+struct path *poly_to_path(const struct p2d *poly, double r_tool, double z);
+struct path *polys_to_paths(const struct p2d *polys, double r_tool, double z);
+
+#endif /* !POLY2D_H */