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159 lines
3.5 KiB
159 lines
3.5 KiB
/*
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Copyright (C) 2003 Nikolas Zimmermann <wildfox@kde.org>
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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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aint 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 "Point.h"
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#include "BezierPathLibart.h"
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#include <kdebug.h>
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#include <libart_lgpl/art_bpath.h>
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#include <libart_lgpl/art_vpath.h>
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#include <libart_lgpl/art_vpath_bpath.h>
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using namespace T2P;
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BezierPathLibart::BezierPathLibart() : BezierPath()
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{
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m_array.resize(0);
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m_length = -1;
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}
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BezierPathLibart::BezierPathLibart(ArtBpath *other) : BezierPath()
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{
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int i = 0;
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for(;other[i].code != ART_END; i++)
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{
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ensureSpace(m_array, i)
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m_array[i] = other[i];
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}
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ensureSpace(m_array, i)
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m_array[i].code = ART_END;
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}
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BezierPathLibart::~BezierPathLibart()
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{
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}
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double BezierPathLibart::length(double t)
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{
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if(m_length < 0.0)
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{
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double total = 0.0;
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// We cheat a bit...
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ArtVpath *vpath = art_bez_path_to_vec(m_array.data(), 0.25);
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double x = 0.0, y = 0.0;
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for(int i = 0; vpath[i].code != ART_END; i++)
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{
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if(vpath[i].code == ART_MOVETO)
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{
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x = vpath[i].x;
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y = vpath[i].y;
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}
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else if(vpath[i].code == ART_LINETO)
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{
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double dx = x, dy = y;
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x = vpath[i].x;
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y = vpath[i].y;
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dx = x - dx;
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dy = y - dy;
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total += sqrt(pow(dx, 2) + pow(dy, 2));
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}
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}
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art_free(vpath);
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return total * t;
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}
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else
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return m_length * t;
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}
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void BezierPathLibart::pointTangentNormalAt(double t, Point *p, Point *tn, Point *n)
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{
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double totallen = length(t);
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// We cheat a bit...
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ArtVpath *vpath = art_bez_path_to_vec(m_array.data(), 0.25);
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double total = 0.0;
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double x = 0.0, y = 0.0;
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for(int i = 0; vpath[i].code != ART_END; i++)
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{
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if(vpath[i].code == ART_MOVETO)
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{
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x = vpath[i].x;
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y = vpath[i].y;
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}
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else if(vpath[i].code == ART_LINETO)
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{
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double dx = x, dy = y;
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x = vpath[i].x;
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y = vpath[i].y;
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dx = x - dx;
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dy = y - dy;
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double seg_len = sqrt(pow(dx, 2) + pow(dy, 2));
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total += seg_len;
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if(total >= totallen)
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{
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double fract = 1 - (totallen - (total - seg_len)) / seg_len;
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if(p)
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{
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p->setX(x - dx * fract);
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p->setY(y - dy * fract);
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}
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// Calculate tangent
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if(tn)
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{
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tn->setX(dx);
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tn->setY(dy);
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}
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// Calculate normal vector.
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if(n)
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{
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// Calculate vector product of "binormal" x tangent
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// (0,0,1) x (dx,dy,0), which is simply (dy,-dx,0).
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n->setX(dy);
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n->setY(-dx);
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}
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return;
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}
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}
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}
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art_free(vpath);
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}
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void BezierPathLibart::boundingBox(Point *topLeft, Point *bottomRight)
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{
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if(m_array.count() > 0)
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{
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// We cheat a bit...
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ArtVpath *vpath = art_bez_path_to_vec(m_array.data(), 0.25);
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ArtDRect rect;
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art_vpath_bbox_drect(vpath, &rect);
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art_free(vpath);
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*topLeft = Point(rect.x0, rect.y0);
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*bottomRight = Point(rect.x1, rect.y1);
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}
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else
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{
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*topLeft = Point(0, 0);
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*bottomRight = Point(0, 0);
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}
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}
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