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authorscuri <scuri>2010-06-21 22:55:10 +0000
committerscuri <scuri>2010-06-21 22:55:10 +0000
commit37a92b86d13e89d0dcec92be6d23ceced29dbc36 (patch)
treefaff61ef668379212b4ed948934533c3f2fe308b /src/ftgl/FTContour.h
parenta124216ee05a5d63ea8fcdafcd050ad1fadf0b09 (diff)
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+/*
+ * FTGL - OpenGL font library
+ *
+ * Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz>
+ * Copyright (c) 2008 Éric Beets <ericbeets@free.fr>
+ * Copyright (c) 2008 Sam Hocevar <sam@zoy.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __FTContour__
+#define __FTContour__
+
+#include "FTGL/ftgl.h"
+
+#include "FTVector.h"
+
+
+/**
+ * FTContour class is a container of points that describe a vector font
+ * outline. It is used as a container for the output of the bezier curve
+ * evaluator in FTVectoriser.
+ *
+ * @see FTOutlineGlyph
+ * @see FTPolygonGlyph
+ * @see FTPoint
+ */
+class FTContour
+{
+ public:
+ /**
+ * Constructor
+ *
+ * @param contour
+ * @param pointTags
+ * @param numberOfPoints
+ */
+ FTContour(FT_Vector* contour, char* pointTags, unsigned int numberOfPoints);
+
+ /**
+ * Destructor
+ */
+ ~FTContour()
+ {
+ pointList.clear();
+ outsetPointList.clear();
+ frontPointList.clear();
+ backPointList.clear();
+ }
+
+ /**
+ * Return a point at index.
+ *
+ * @param index of the point in the curve.
+ * @return const point reference
+ */
+ const FTPoint& Point(size_t index) const { return pointList[index]; }
+
+ /**
+ * Return a point at index.
+ *
+ * @param index of the point in the outset curve.
+ * @return const point reference
+ */
+ const FTPoint& Outset(size_t index) const { return outsetPointList[index]; }
+
+ /**
+ * Return a point at index of the front outset contour.
+ *
+ * @param index of the point in the curve.
+ * @return const point reference
+ */
+ const FTPoint& FrontPoint(size_t index) const
+ {
+ if(frontPointList.size() == 0)
+ return Point(index);
+ return frontPointList[index];
+ }
+
+
+ /**
+ * Return a point at index of the back outset contour.
+ *
+ * @param index of the point in the curve.
+ * @return const point reference
+ */
+ const FTPoint& BackPoint(size_t index) const
+ {
+ if(backPointList.size() == 0)
+ return Point(index);
+ return backPointList[index];
+ }
+
+ /**
+ * How many points define this contour
+ *
+ * @return the number of points in this contour
+ */
+ size_t PointCount() const { return pointList.size(); }
+
+ /**
+ * Make sure the glyph has the proper parity and create the front/back
+ * outset contour.
+ *
+ * @param parity The contour's parity within the glyph.
+ */
+ void SetParity(int parity);
+
+ // FIXME: this should probably go away.
+ void buildFrontOutset(float outset);
+ void buildBackOutset(float outset);
+
+ private:
+ /**
+ * Add a point to this contour. This function tests for duplicate
+ * points.
+ *
+ * @param point The point to be added to the contour.
+ */
+ inline void AddPoint(FTPoint point);
+
+ /**
+ * Add a point to this contour. This function tests for duplicate
+ * points.
+ *
+ * @param point The point to be added to the contour.
+ */
+ inline void AddOutsetPoint(FTPoint point);
+
+ /*
+ * Add a point to this outset contour. This function tests for duplicate
+ * points.
+ *
+ * @param point The point to be added to the contour outset.
+ */
+ inline void AddFrontPoint(FTPoint point);
+ inline void AddBackPoint(FTPoint point);
+
+ /**
+ * De Casteljau (bezier) algorithm contributed by Jed Soane
+ * Evaluates a quadratic or conic (second degree) curve
+ */
+ inline void evaluateQuadraticCurve(FTPoint, FTPoint, FTPoint);
+
+ /**
+ * De Casteljau (bezier) algorithm contributed by Jed Soane
+ * Evaluates a cubic (third degree) curve
+ */
+ inline void evaluateCubicCurve(FTPoint, FTPoint, FTPoint, FTPoint);
+
+ /**
+ * Compute the vector norm
+ */
+ inline FTGL_DOUBLE NormVector(const FTPoint &v);
+
+ /**
+ * Compute a rotation matrix from a vector
+ */
+ inline void RotationMatrix(const FTPoint &a, const FTPoint &b, FTGL_DOUBLE *matRot, FTGL_DOUBLE *invRot);
+
+ /**
+ * Matrix and vector multiplication
+ */
+ inline void MultMatrixVect(FTGL_DOUBLE *mat, FTPoint &v);
+
+ /**
+ * Compute the vector bisecting from a vector 'v' and a distance 'd'
+ */
+ inline void ComputeBisec(FTPoint &v);
+
+ /**
+ * Compute the outset point coordinates
+ */
+ inline FTPoint ComputeOutsetPoint(FTPoint a, FTPoint b, FTPoint c);
+
+ /**
+ * The list of points in this contour
+ */
+ typedef FTVector<FTPoint> PointVector;
+ PointVector pointList;
+ PointVector outsetPointList;
+ PointVector frontPointList;
+ PointVector backPointList;
+
+ /**
+ * Is this contour clockwise or anti-clockwise?
+ */
+ bool clockwise;
+};
+
+#endif // __FTContour__
+