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496 lines
10 KiB
496 lines
10 KiB
/*
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Copyright (C) 2001-2003 KSVG Team
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This file is part of the KDE project
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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 Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include <math.h>
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#include <kdebug.h>
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#include "SVGPathSegArcImpl.h"
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#include "SVGAngleImpl.h"
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using namespace KSVG;
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#include "SVGPathSegArcImpl.lut.h"
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#include "ksvg_scriptinterpreter.h"
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#include "ksvg_bridge.h"
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static void getArcSlopes(bool relative, double curx, double cury, double angle, double x, double y, double r1, double r2, bool largeArcFlag, bool sweepFlag, double *pStartSlope, double *pEndSlope)
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{
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double sin_th, cos_th;
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double a00, a01, a10, a11;
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double x0, y0, x1, y1, xc, yc;
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double d, sfactor, sfactor_sq;
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double th0, th1, th_arc;
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int i, n_segs;
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sin_th = sin(angle * (M_PI / 180.0));
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cos_th = cos(angle * (M_PI / 180.0));
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double dx;
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if(!relative)
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dx = (curx - x) / 2.0;
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else
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dx = -x / 2.0;
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double dy;
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if(!relative)
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dy = (cury - y) / 2.0;
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else
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dy = -y / 2.0;
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double _x1 = cos_th * dx + sin_th * dy;
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double _y1 = -sin_th * dx + cos_th * dy;
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double Pr1 = r1 * r1;
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double Pr2 = r2 * r2;
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double Px = _x1 * _x1;
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double Py = _y1 * _y1;
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// Spec : check if radii are large enough
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double check = Px / Pr1 + Py / Pr2;
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if(check > 1)
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{
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r1 = r1 * sqrt(check);
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r2 = r2 * sqrt(check);
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}
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a00 = cos_th / r1;
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a01 = sin_th / r1;
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a10 = -sin_th / r2;
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a11 = cos_th / r2;
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x0 = a00 * curx + a01 * cury;
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y0 = a10 * curx + a11 * cury;
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if(!relative)
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x1 = a00 * x + a01 * y;
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else
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x1 = a00 * (curx + x) + a01 * (cury + y);
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if(!relative)
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y1 = a10 * x + a11 * y;
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else
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y1 = a10 * (curx + x) + a11 * (cury + y);
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/* (x0, y0) is current point in transformed coordinate space.
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(x1, y1) is new point in transformed coordinate space.
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The arc fits a unit-radius circle in this space.
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*/
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d = (x1 - x0) * (x1 - x0) + (y1 - y0) * (y1 - y0);
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sfactor_sq = 1.0 / d - 0.25;
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if(sfactor_sq < 0)
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sfactor_sq = 0;
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sfactor = sqrt(sfactor_sq);
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if(sweepFlag == largeArcFlag)
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sfactor = -sfactor;
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xc = 0.5 * (x0 + x1) - sfactor * (y1 - y0);
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yc = 0.5 * (y0 + y1) + sfactor * (x1 - x0);
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/* (xc, yc) is center of the circle. */
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th0 = atan2(y0 - yc, x0 - xc);
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th1 = atan2(y1 - yc, x1 - xc);
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th_arc = th1 - th0;
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if(th_arc < 0 && sweepFlag)
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th_arc += 2 * M_PI;
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else if(th_arc > 0 && !sweepFlag)
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th_arc -= 2 * M_PI;
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n_segs = (int) (int) ceil(fabs(th_arc / (M_PI * 0.5 + 0.001)));
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for(int step = 0; step < 2; step++)
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{
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i = step == 0 ? 0 : n_segs - 1;
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double sin_th, cos_th;
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double a00, a01, a10, a11;
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double x1, y1, x2, y2, x3, y3;
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double t;
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double th_half;
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double _th0 = th0 + i * th_arc / n_segs;
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double _th1 = th0 + (i + 1) * th_arc / n_segs;
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sin_th = sin(angle * (M_PI / 180.0));
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cos_th = cos(angle * (M_PI / 180.0));
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/* inverse transform compared with rsvg_path_arc */
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a00 = cos_th * r1;
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a01 = -sin_th * r2;
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a10 = sin_th * r1;
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a11 = cos_th * r2;
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th_half = 0.5 * (_th1 - _th0);
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t = (8.0 / 3.0) * sin(th_half * 0.5) * sin(th_half * 0.5) / sin(th_half);
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x1 = xc + cos(_th0) - t * sin(_th0);
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y1 = yc + sin(_th0) + t * cos(_th0);
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x3 = xc + cos(_th1);
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y3 = yc + sin(_th1);
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x2 = x3 + t * sin(_th1);
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y2 = y3 - t * cos(_th1);
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double bezX1 = a00 * x1 + a01 * y1;
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double bezY1 = a10 * x1 + a11 * y1;
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double bezX2 = a00 * x2 + a01 * y2;
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double bezY2 = a10 * x2 + a11 * y2;
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double bezX = a00 * x3 + a01 * y3;
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double bezY = a10 * x3 + a11 * y3;
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if(step == 0)
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*pStartSlope = SVGAngleImpl::todeg(atan2(bezY1 - cury, bezX1 - curx));
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else
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*pEndSlope = SVGAngleImpl::todeg(atan2(bezY - bezY2, bezX - bezX2));
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}
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}
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SVGPathSegArcAbsImpl::SVGPathSegArcAbsImpl() : SVGPathSegImpl()
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{
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KSVG_EMPTY_FLAGS
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}
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SVGPathSegArcAbsImpl::~SVGPathSegArcAbsImpl()
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{
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}
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void SVGPathSegArcAbsImpl::setX(double x)
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{
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m_x = x;
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}
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double SVGPathSegArcAbsImpl::x() const
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{
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return m_x;
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}
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void SVGPathSegArcAbsImpl::setY(double y)
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{
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m_y = y;
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}
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double SVGPathSegArcAbsImpl::y() const
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{
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return m_y;
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}
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void SVGPathSegArcAbsImpl::setR1(double r1)
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{
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m_r1 = r1;
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}
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double SVGPathSegArcAbsImpl::r1() const
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{
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return m_r1;
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}
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void SVGPathSegArcAbsImpl::setR2(double r2)
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{
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m_r2 = r2;
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}
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double SVGPathSegArcAbsImpl::r2() const
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{
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return m_r2;
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}
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void SVGPathSegArcAbsImpl::setAngle(double angle)
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{
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m_angle = angle;
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}
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double SVGPathSegArcAbsImpl::angle() const
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{
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return m_angle;
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}
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void SVGPathSegArcAbsImpl::setLargeArcFlag(bool largeArcFlag)
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{
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m_largeArcFlag = largeArcFlag;
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}
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bool SVGPathSegArcAbsImpl::largeArcFlag() const
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{
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return m_largeArcFlag;
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}
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void SVGPathSegArcAbsImpl::setSweepFlag(bool sweepFlag)
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{
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m_sweepFlag = sweepFlag;
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}
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bool SVGPathSegArcAbsImpl::sweepFlag() const
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{
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return m_sweepFlag;
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}
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void SVGPathSegArcAbsImpl::getDeltasAndSlopes(double curx, double cury, double *pDx, double *pDy, double *pStartSlope, double *pEndSlope) const
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{
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double dx = x() - curx;
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double dy = y() - cury;
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double startSlope;
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double endSlope;
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getArcSlopes(false, curx, cury, angle(), x(), y(), r1(), r2(), largeArcFlag(), sweepFlag(), &startSlope, &endSlope);
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*pDx = dx;
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*pDy = dy;
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*pStartSlope = startSlope;
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*pEndSlope = endSlope;
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}
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// Ecma stuff
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/*
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@namespace KSVG
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@begin SVGPathSegArcAbsImpl::s_hashTable 11
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x SVGPathSegArcAbsImpl::X DontDelete
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y SVGPathSegArcAbsImpl::Y DontDelete
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r1 SVGPathSegArcAbsImpl::R1 DontDelete
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r2 SVGPathSegArcAbsImpl::R2 DontDelete
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angle SVGPathSegArcAbsImpl::Angle DontDelete
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largeArcFlag SVGPathSegArcAbsImpl::LargeArcFlag DontDelete
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sweepFlag SVGPathSegArcAbsImpl::SweepFlag DontDelete
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@end
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*/
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Value SVGPathSegArcAbsImpl::getValueProperty(ExecState *, int token) const
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{
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switch(token)
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{
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case X:
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return Number(x());
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case Y:
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return Number(y());
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case R1:
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return Number(r1());
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case R2:
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return Number(r2());
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case Angle:
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return Number(angle());
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case LargeArcFlag:
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return Boolean(largeArcFlag());
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case SweepFlag:
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return Boolean(sweepFlag());
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default:
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kdWarning() << "Unhandled token in " << k_funcinfo << " : " << token << endl;
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return Undefined();
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}
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}
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void SVGPathSegArcAbsImpl::putValueProperty(ExecState *exec, int token, const Value &value, int)
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{
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switch(token)
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{
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case X:
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m_x = value.toNumber(exec);
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break;
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case Y:
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m_y = value.toNumber(exec);
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break;
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case R1:
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m_r1 = value.toNumber(exec);
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break;
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case R2:
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m_r2 = value.toNumber(exec);
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break;
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case Angle:
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m_angle = value.toNumber(exec);
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break;
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case LargeArcFlag:
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m_largeArcFlag = value.toBoolean(exec);
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break;
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case SweepFlag:
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m_sweepFlag = value.toBoolean(exec);
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break;
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default:
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kdWarning() << "Unhandled token in " << k_funcinfo << " : " << token << endl;
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}
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}
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SVGPathSegArcRelImpl::SVGPathSegArcRelImpl() : SVGPathSegImpl()
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{
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KSVG_EMPTY_FLAGS
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}
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SVGPathSegArcRelImpl::~SVGPathSegArcRelImpl()
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{
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}
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void SVGPathSegArcRelImpl::setX(double x)
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{
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m_x = x;
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}
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double SVGPathSegArcRelImpl::x() const
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{
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return m_x;
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}
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void SVGPathSegArcRelImpl::setY(double y)
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{
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m_y = y;
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}
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double SVGPathSegArcRelImpl::y() const
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{
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return m_y;
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}
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void SVGPathSegArcRelImpl::setR1(double r1)
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{
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m_r1 = r1;
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}
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double SVGPathSegArcRelImpl::r1() const
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{
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return m_r1;
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}
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void SVGPathSegArcRelImpl::setR2(double r2)
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{
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m_r2 = r2;
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}
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double SVGPathSegArcRelImpl::r2() const
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{
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return m_r2;
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}
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void SVGPathSegArcRelImpl::setAngle(double angle)
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{
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m_angle = angle;
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}
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double SVGPathSegArcRelImpl::angle() const
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{
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return m_angle;
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}
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void SVGPathSegArcRelImpl::setLargeArcFlag(bool largeArcFlag)
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{
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m_largeArcFlag = largeArcFlag;
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}
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bool SVGPathSegArcRelImpl::largeArcFlag() const
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{
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return m_largeArcFlag;
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}
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void SVGPathSegArcRelImpl::setSweepFlag(bool sweepFlag)
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{
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m_sweepFlag = sweepFlag;
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}
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bool SVGPathSegArcRelImpl::sweepFlag() const
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{
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return m_sweepFlag;
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}
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void SVGPathSegArcRelImpl::getDeltasAndSlopes(double curx, double cury, double *pDx, double *pDy, double *pStartSlope, double *pEndSlope) const
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{
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double dx = x();
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double dy = y();
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double startSlope;
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double endSlope;
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getArcSlopes(true, curx, cury, angle(), x(), y(), r1(), r2(), largeArcFlag(), sweepFlag(), &startSlope, &endSlope);
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*pDx = dx;
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*pDy = dy;
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*pStartSlope = startSlope;
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*pEndSlope = endSlope;
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}
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// Ecma stuff
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/*
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@namespace KSVG
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@begin SVGPathSegArcRelImpl::s_hashTable 11
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x SVGPathSegArcRelImpl::X DontDelete
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y SVGPathSegArcRelImpl::Y DontDelete
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r1 SVGPathSegArcRelImpl::R1 DontDelete
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r2 SVGPathSegArcRelImpl::R2 DontDelete
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angle SVGPathSegArcRelImpl::Angle DontDelete
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largeArcFlag SVGPathSegArcRelImpl::LargeArcFlag DontDelete
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sweepFlag SVGPathSegArcRelImpl::SweepFlag DontDelete
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@end
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*/
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Value SVGPathSegArcRelImpl::getValueProperty(ExecState *, int token) const
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{
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switch(token)
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{
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case X:
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return Number(x());
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case Y:
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return Number(y());
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case R1:
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return Number(r1());
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case R2:
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return Number(r2());
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case Angle:
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return Number(angle());
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case LargeArcFlag:
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return Boolean(largeArcFlag());
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case SweepFlag:
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return Boolean(sweepFlag());
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default:
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kdWarning() << "Unhandled token in " << k_funcinfo << " : " << token << endl;
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return Undefined();
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}
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}
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void SVGPathSegArcRelImpl::putValueProperty(ExecState *exec, int token, const Value &value, int)
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{
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switch(token)
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{
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case X:
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m_x = value.toNumber(exec);
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break;
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case Y:
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m_y = value.toNumber(exec);
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break;
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case R1:
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m_r1 = value.toNumber(exec);
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break;
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case R2:
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m_r2 = value.toNumber(exec);
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break;
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case Angle:
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m_angle = value.toNumber(exec);
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break;
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case LargeArcFlag:
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m_largeArcFlag = value.toBoolean(exec);
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break;
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case SweepFlag:
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m_sweepFlag = value.toBoolean(exec);
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break;
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default:
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kdWarning() << "Unhandled token in " << k_funcinfo << " : " << token << endl;
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}
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}
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// vim:ts=4:noet
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