From a6163888f3c56123b1db313743c6147ba498732c Mon Sep 17 00:00:00 2001
From: Yuval Adam <yuv.adm@gmail.com>
Date: Fri, 8 Aug 2014 14:42:07 +0300
Subject: Add third_party libs

---
 third_party/windows/fltk-1.1.10/src/fl_curve.cxx | 106 +++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 third_party/windows/fltk-1.1.10/src/fl_curve.cxx

(limited to 'third_party/windows/fltk-1.1.10/src/fl_curve.cxx')

diff --git a/third_party/windows/fltk-1.1.10/src/fl_curve.cxx b/third_party/windows/fltk-1.1.10/src/fl_curve.cxx
new file mode 100644
index 0000000..5007e9a
--- /dev/null
+++ b/third_party/windows/fltk-1.1.10/src/fl_curve.cxx
@@ -0,0 +1,106 @@
+//
+// "$Id: fl_curve.cxx 5190 2006-06-09 16:16:34Z mike $"
+//
+// Bezier curve functions for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 1998-2005 by Bill Spitzak and others.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library 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
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+// USA.
+//
+// Please report all bugs and problems on the following page:
+//
+//     http://www.fltk.org/str.php
+//
+
+// Utility for drawing Bezier curves, adding the points to
+// the current fl_begin/fl_vertex/fl_end path.
+// Incremental math implementation:
+// I very much doubt this is optimal!  From Foley/vanDam page 511.
+// If anybody has a better algorithim, please send it!
+
+#include <FL/fl_draw.H>
+#include <math.h>
+
+void fl_curve(double X0, double Y0,
+	      double X1, double Y1,
+	      double X2, double Y2,
+	      double X3, double Y3) {
+
+  double x = fl_transform_x(X0,Y0);
+  double y = fl_transform_y(X0,Y0);
+
+  // draw point 0:
+  fl_transformed_vertex(x,y);
+
+  double x1 = fl_transform_x(X1,Y1);
+  double yy1 = fl_transform_y(X1,Y1);
+  double x2 = fl_transform_x(X2,Y2);
+  double y2 = fl_transform_y(X2,Y2);
+  double x3 = fl_transform_x(X3,Y3);
+  double y3 = fl_transform_y(X3,Y3);
+
+  // find the area:
+  double a = fabs((x-x2)*(y3-yy1)-(y-y2)*(x3-x1));
+  double b = fabs((x-x3)*(y2-yy1)-(y-y3)*(x2-x1));
+  if (b > a) a = b;
+
+  // use that to guess at the number of segments:
+  int n = int(sqrt(a)/4);
+  if (n > 1) {
+    if (n > 100) n = 100; // make huge curves not hang forever
+
+    double e = 1.0/n;
+
+    // calculate the coefficients of 3rd order equation:
+    double xa = (x3-3*x2+3*x1-x);
+    double xb = 3*(x2-2*x1+x);
+    double xc = 3*(x1-x);
+    // calculate the forward differences:
+    double dx1 = ((xa*e+xb)*e+xc)*e;
+    double dx3 = 6*xa*e*e*e;
+    double dx2 = dx3 + 2*xb*e*e;
+
+    // calculate the coefficients of 3rd order equation:
+    double ya = (y3-3*y2+3*yy1-y);
+    double yb = 3*(y2-2*yy1+y);
+    double yc = 3*(yy1-y);
+    // calculate the forward differences:
+    double dy1 = ((ya*e+yb)*e+yc)*e;
+    double dy3 = 6*ya*e*e*e;
+    double dy2 = dy3 + 2*yb*e*e;
+
+    // draw points 1 .. n-2:
+    for (int m=2; m<n; m++) {
+      x += dx1;
+      dx1 += dx2;
+      dx2 += dx3;
+      y += dy1;
+      dy1 += dy2;
+      dy2 += dy3;
+      fl_transformed_vertex(x,y);
+    }
+
+    // draw point n-1:
+    fl_transformed_vertex(x+dx1, y+dy1);
+  }
+
+  // draw point n:
+  fl_transformed_vertex(x3,y3);
+}
+
+//
+// End of "$Id: fl_curve.cxx 5190 2006-06-09 16:16:34Z mike $".
+//
-- 
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