1 files changed, 126 insertions, 0 deletions
diff --git a/ksvg/plugin/backends/agg/BezierPathAgg.cpp b/ksvg/plugin/backends/agg/BezierPathAgg.cpp
new file mode 100644
index 00000000..10a75c1c
--- /dev/null
+++ b/ksvg/plugin/backends/agg/BezierPathAgg.cpp
@@ -0,0 +1,126 @@
+/*
+    Copyright (C) 2003 Nikolas Zimmermann <[email protected]>
+    This file is part of the KDE project
+
+    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
+    aint with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#include <math.h>
+#include "Point.h"
+#include "BezierPathAgg.h"
+
+#include <kdebug.h>
+
+#include <agg_basics.h>
+#include <agg_bounding_rect.h>
+
+using namespace T2P;
+
+double BezierPathAgg::length(double t)
+{
+	if(m_length < 0.0)
+	{
+		double total = 0.0;
+		double x = 0.0, y = 0.0;
+		double x2, y2;
+		unsigned cmd;
+		unsigned int id = 0;
+		m_curved_trans.rewind(id);
+		while(!agg::is_stop(cmd = m_curved_trans.vertex(&x2, &y2)))
+		{
+			if(agg::is_move_to(cmd))
+			{
+				x = x2;
+				y = y2;	
+			}
+			else if(agg::is_line_to(cmd))
+			{
+				double dx = x, dy = y;
+				dx = x2 - dx;
+				dy = y2 - dy;
+				total += sqrt(pow(dx, 2) + pow(dy, 2));
+				x = x2;
+				y = y2;
+			}
+		}
+		return total * t;
+	}
+	else
+		return m_length * t;
+}
+
+void BezierPathAgg::pointTangentNormalAt(double t, Point *p, Point *tn, Point *n)
+{
+	double totallen = length(t);
+	double total = 0.0;
+        double x = 0.0, y = 0.0;
+	double x2, y2;
+	unsigned cmd;
+	unsigned int id = 0;
+	m_curved_trans.rewind(id);
+	while(!agg::is_stop(cmd = m_curved_trans.vertex(&x2, &y2)))
+	{
+		if(agg::is_move_to(cmd))
+		{
+			x = x2;
+			y = y2;	
+		}
+		else if(agg::is_line_to(cmd))
+		{
+			double dx = x, dy = y;
+			x = x2;
+			y = y2;
+			dx = x - dx;
+			dy = y - dy;
+			double seg_len = sqrt(pow(dx, 2) + pow(dy, 2));
+			total += seg_len;
+			if(total >= totallen)
+			{
+				double fract = 1 - (totallen - (total - seg_len)) / seg_len;
+				if(p)
+				{
+					p->setX(x - dx * fract);
+					p->setY(y - dy * fract);
+				}
+				if(tn)
+				{
+					//kdDebug() << k_funcinfo << "dx : " << dx << endl;
+					//kdDebug() << k_funcinfo << "dy : " << dy << endl;
+					tn->setX(dx);
+					tn->setY(dy);
+				}
+				if(n)
+				{
+					// Calculate vector product of "binormal" x tangent
+					// (0,0,1) x (dx,dy,0), which is simply (dy,-dx,0).
+					n->setX(dy);
+					n->setY(-dx);
+				}
+				return;
+			}
+		}
+	}
+}
+
+void BezierPathAgg::boundingBox(Point *topLeft, Point *bottomRight)
+{
+	double x1, y1, x2, y2;
+	agg::bounding_rect(m_curved, *this, 0, 1, &x1, &y1, &x2, &y2);
+	*topLeft = Point(x1, y1);
+	*bottomRight = Point(x2, y2);
+}
+
+// vim:ts=4:noet