Add Spiro version 0.01.

1 files changed, 96 insertions, 0 deletions

diff --git a/third_party/spiro/ppedit/bezctx_x3.c b/third_party/spiro/ppedit/bezctx_x3.c
new file mode 100644
index 0000000..9278910
--- /dev/null
+++ b/third_party/spiro/ppedit/bezctx_x3.c
@@ -0,0 +1,96 @@
+/*
+ppedit - A pattern plate editor for Spiro splines.
+Copyright (C) 2007 Raph Levien
+
+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,
+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.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA.
+
+*/
+#include <x3.h>
+#include "zmisc.h"
+#include "bezctx.h"
+#include "bezctx_x3.h"
+
+typedef struct {
+    bezctx base;
+    x3dc *dc;
+    int is_open;
+} bezctx_x3;
+
+static void
+bezctx_x3_moveto(bezctx *z, double x, double y, int is_open) {
+    bezctx_x3 *bc = (bezctx_x3 *)z;
+
+    if (!bc->is_open) x3closepath(bc->dc);
+    x3moveto(bc->dc, x, y);
+    bc->is_open = is_open;
+}
+
+void
+bezctx_x3_lineto(bezctx *z, double x, double y) {
+    bezctx_x3 *bc = (bezctx_x3 *)z;
+
+    x3lineto(bc->dc, x, y);
+}
+
+void
+bezctx_x3_quadto(bezctx *z, double x1, double y1, double x2, double y2)
+{
+    bezctx_x3 *bc = (bezctx_x3 *)z;
+    double x0, y0;
+
+    x3getcurrentpoint(bc->dc, &x0, &y0);
+    x3curveto(bc->dc,
+		  x1 + (1./3) * (x0 - x1),
+		  y1 + (1./3) * (y0 - y1),
+		  x1 + (1./3) * (x2 - x1),
+		  y1 + (1./3) * (y2 - y1),
+		  x2,
+		  y2);
+}
+
+void
+bezctx_x3_curveto(bezctx *z, double x1, double y1, double x2, double y2,
+		      double x3, double y3)
+{
+    bezctx_x3 *bc = (bezctx_x3 *)z;
+
+    x3curveto(bc->dc, x1, y1, x2, y2, x3, y3);
+}
+
+void
+bezctx_x3_finish(bezctx *z)
+{
+    bezctx_x3 *bc = (bezctx_x3 *)z;
+
+    if (!bc->is_open)
+	x3closepath(bc->dc);
+
+    zfree(bc);
+}
+
+bezctx *
+new_bezctx_x3(x3dc *dc) {
+    bezctx_x3 *result = znew(bezctx_x3, 1);
+
+    result->base.moveto = bezctx_x3_moveto;
+    result->base.lineto = bezctx_x3_lineto;
+    result->base.quadto = bezctx_x3_quadto;
+    result->base.curveto = bezctx_x3_curveto;
+    result->base.mark_knot = NULL;
+    result->dc = dc;
+    result->is_open = 1;
+    return &result->base;
+}