224 lines
9.1 KiB
C++
224 lines
9.1 KiB
C++
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/*
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* Portable Agile C++ Classes (PACC)
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* Copyright (C) 2001-2003 by Marc Parizeau
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* http://manitou.gel.ulaval.ca/~parizeau/PACC
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Contact:
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* Laboratoire de Vision et Systemes Numeriques
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* Departement de genie electrique et de genie informatique
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* Universite Laval, Quebec, Canada, G1K 7P4
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* http://vision.gel.ulaval.ca
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*
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*/
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/*!
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* \file PACC/SVG/Path.hpp
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* \brief Class definition for the SVG path primitive.
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* \author Marc Parizeau and Michel Fortin, Laboratoire de vision et systèmes numériques, Université Laval
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* $Revision: 1.5.2.1 $
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* $Date: 2007/09/10 18:24:08 $
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*/
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#ifndef PACC_SVG_Path_hpp_
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#define PACC_SVG_Path_hpp_
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#include "SVG/Primitives.hpp"
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#include "SVG/Styles.hpp"
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#include "SVG/Types.hpp"
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namespace PACC {
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namespace SVG {
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using namespace std;
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// forward declaration
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class PathData;
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/*!\brief Graphic primitive for paths.
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* \ingroup SVG
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*
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* \see pathcommands
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*/
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class Path : public Primitive {
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public:
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//! Make an empty path with style \c inStyle.
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explicit Path(const Style& inStyle = Style()) : Primitive("path", inStyle) {}
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/*!\brief Make a path command with data \c inPath and style \c inStyle.
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*
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* This constructor gives a already defined path. You can
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* always add more commands witht the += operator.
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*/
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Path(const PathData& inPath, const Style& inStyle = Style()) : Primitive("path", inStyle) {
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setAttribute("d", (string&)inPath);
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}
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//! Return the result of concatenating this path with path data \c inCommands.
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Path operator+(const PathData& inCommands) const {
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return Path(*this) += inCommands;
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}
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//! Append commands \c inCommands to this path.
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Path &operator+=(const PathData &inCommands) {
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string lDefinition = getAttribute("d");
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lDefinition += string(" ") + (string&)inCommands;
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setAttribute("d", lDefinition);
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return *this;
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}
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};
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/*!\brief %Data defining a path.
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* \ingroup SVG
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*
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* This is the base class for path commands. It is not possible to create
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* an instance of this class directly. Instead you should use one of the
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* subclasses that provide real functionalities.
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*/
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class PathData : protected string {
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public:
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//! Return the result of concatenating this path data with \c inData.
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PathData operator+(const PathData &inData) {
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return PathData((string &)(*this) + " " + inData);
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}
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protected:
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//! Make data path from string \c inValue.
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PathData(const string &inValue) : string(inValue) {}
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};
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//! \brief %Path command for starting a new subpath at given coordinate.
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//! \ingroup SVG
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class MoveTo : public PathData {
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public:
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//! make moveto from point \c inPoint.
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MoveTo(const Point &inPoint) : PathData(string("M") + inPoint.getStringValue()) {}
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//! Make moveto from coordinates \c inX and \c inY.
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MoveTo(float inX, float inY) : PathData(string("M") + Point(inX, inY).getStringValue()) {}
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};
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//! \brief %Path command for drawing a line.
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//! \ingroup SVG
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class LineTo : public PathData {
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public:
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//! Make lineto with point \c inPoint.
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LineTo(const Point &inPoint) : PathData(string("L") + inPoint.getStringValue()) {}
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//! Make lineto with coordinates \c inX and \c inY,
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LineTo(float inX, float inY) : PathData(string("L") + Point(inX, inY).getStringValue()) {}
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};
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/*!\brief %Path command to close the current subpath.
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* \ingroup SVG
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*
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* This command close the subpath by drawing a straight line from the
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* current point to current subpath's initial point.
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*/
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class ClosePath : public PathData {
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public:
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//! Default constructor.
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ClosePath() : PathData("z") {}
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};
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//! \brief %Path command to draw a cubic Bezier curve.
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//! \ingroup SVG
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class CubicCurveTo : public PathData {
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public:
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//! Make cubic curve to point \c inPoint, using control points \c inCtlPoint/ and \c inCtlPoint2;
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CubicCurveTo(const Point &inPoint, const Point &inCtlPoint1, const Point &inCtlPoint2) : PathData("C" + inCtlPoint1.getStringValue() + " " + inCtlPoint2.getStringValue() + " " + inPoint.getStringValue()) {}
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/*!\brief Make cubic curve to point \c inPoint, using a single control point \c inCtlPoint.
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*
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* The beginning control point is assumed to be the reflection of the
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* end control point on the previous command relative to the current
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* point. If previous command is not a CubicCurveTo, assume the end
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* control point is coincident with the current point.
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*/
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CubicCurveTo(const Point &inPoint, const Point &inCtlPoint) : PathData("S" + inCtlPoint.getStringValue() + " " + inPoint.getStringValue()) {}
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};
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//! \brief %Path command to draw a quadratic Bezier curve.
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//! \ingroup SVG
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class QuadraticCurveTo : public PathData {
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public:
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//! Make quadratic curve to point \c inPoint, using control point \c inCtlPoint.
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QuadraticCurveTo(const Point &inPoint, const Point &inCtlPoint) : PathData("Q" + inCtlPoint.getStringValue() + " " + " " + inPoint.getStringValue()) {}
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/*!\brief Make quadratic curve to point \c inPoint, without using any control point.
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*
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* The control point is assumed to be the reflection of the control
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* point on the previous command relative to the current point. If
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* previous command is not a QuadraticCurveTo, assume the control point
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* is coincident with the current point.
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*/
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QuadraticCurveTo(const Point &inPoint) : PathData("S" + inPoint.getStringValue()) {}
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};
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/*!\brief %Path command to draw an elliptical arc.
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* \ingroup SVG
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*
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* Draws an elliptical arc from the current point to given coordinates. The
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* size and orientation of the ellipse are defined by x-radius and y-radius
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* and an x-axis-rotation, which indicates how the ellipse as a whole is
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* rotated relative to the current coordinate system. The center of the
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* ellipse is calculated automatically to satisfy the constraints imposed
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* by the other parameters. Large-arc and sweep contribute to the automatic
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* calculations and help determine how the arc is drawn.
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*
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* For most situations, there are actually four different arcs (two
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* different ellipses, each with two different arc sweeps) that satisfy
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* these constraints. large-arc-flag and sweep-flag indicate which one of
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* the four arcs are drawn, as follows:
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*
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* <ul>
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* <li> Of the four candidate arc sweeps, two will represent an arc sweep of
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* greater than or equal to 180 degrees (the "large-arc"), and two will
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* represent an arc sweep of less than or equal to 180 degrees (the
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* "small-arc"). If large-arc is true, then one of the two larger
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* arc sweeps will be chosen; otherwise, if large-arc is false, one
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* of the smaller arc sweeps will be chosen,
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*
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* <li> If sweep is true, then the arc will be drawn in a
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* "positive-angle" direction (i.e., the ellipse formula
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* x=cx+rx*cos(theta) and y=cy+ry*sin(theta) is evaluated such that
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* theta starts at an angle corresponding to the current point and
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* increases positively until the arc reaches (x,y)). A value of false
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* causes the arc to be drawn in a "negative-angle" direction (i.e.,
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* theta starts at an angle value corresponding to the current point
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* and decreases until the arc reaches (x,y)).
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* </ul>
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*/
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class EllipticalArcTo : public PathData {
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public:
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/*!\brief Constructor.
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* \param inPoint A destination point for the curve.
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* \param inXRadius An x radius of the ellipse.
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* \param inYRadius An y radius of the ellipse.
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* \param inXAxisRotation A angle of rotation for the ellipse.
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* \param inLargeArc True for the path to follow the large arc,
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* false to follow the smaller one.
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* \param inSweep True to turn by a positive angle, false
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* for a negative one.
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*/
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EllipticalArcTo(const Point &inPoint, float inXRadius, float inYRadius, float inXAxisRotation, bool inLargeArc, bool inSweep) : PathData(string("A") + String::convert(inXRadius) + "," + String::convert(inYRadius) + " " + String::convert(inXAxisRotation) + " " + ( inLargeArc ? "1" : "0" ) + " " + ( inSweep ? "1" : "0" ) + " " + inPoint.getStringValue()) {}
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};
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//! Short name for a cubic Bezier curve path command.
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typedef CubicCurveTo CurveTo;
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} // end of SVG namespace
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} // end of PACC namespace
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#endif // PACC_SVG_Path_hpp_
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