summaryrefslogtreecommitdiffstats
path: root/ksvg/impl/SVGPolyElementImpl.cpp
blob: b1557aa3fad9104ab498c69b7eaaeac40a068868 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
/*
    Copyright (C) 2001-2003 KSVG Team
    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
    along 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 <cfloat>

#include <kdebug.h>

#include "SVGRectImpl.h"
#include "SVGPointListImpl.h"
#include "SVGSVGElementImpl.h"
#include "SVGPolyElementImpl.h"
#include "SVGAngleImpl.h"

using namespace KSVG;

SVGPolyElementImpl::SVGPolyElementImpl(DOM::ElementImpl *impl) : SVGShapeImpl(impl), SVGTestsImpl(), SVGLangSpaceImpl(), SVGExternalResourcesRequiredImpl(), SVGStylableImpl(this), SVGTransformableImpl(), SVGAnimatedPointsImpl()
{
}

SVGPolyElementImpl::~SVGPolyElementImpl()
{
}

SVGRectImpl *SVGPolyElementImpl::getBBox()
{
	SVGRectImpl *ret = SVGSVGElementImpl::createSVGRect();

	unsigned int nrPoints = points()->numberOfItems();
	float minx, miny, maxx, maxy, tempx, tempy;
	minx = points()->getItem(0)->x();
	miny = points()->getItem(0)->y();
	maxx = points()->getItem(0)->x();
	maxy = points()->getItem(0)->y();

	for(unsigned int i = 1; i < nrPoints; ++i)
	{
		tempx = points()->getItem(i)->x();
		tempy = points()->getItem(i)->y();

		if(tempx < minx)
			minx = tempx;
		if(tempx > maxx)
			maxx = tempx;
		if(tempy < miny)
			miny = tempy;
		if(tempy > maxy)
			maxy = tempy;
	}

	ret->setX(minx);
	ret->setY(miny);
	ret->setWidth(maxx - minx);
	ret->setHeight(maxy - miny);
	return ret;
}

bool SVGPolyElementImpl::findOutSlope(unsigned int point, double *outSlope) const
{
	unsigned int nextPoint;

	if(point == points()->numberOfItems() - 1)
	{
		if(m_isOpenPath)
			return false;
		else
			nextPoint = 0;
	}
	else
		nextPoint = point + 1;

	if(point == nextPoint)
		return false;

	double x = points()->getItem(point)->x();
	double y = points()->getItem(point)->y();
	double nextX = points()->getItem(nextPoint)->x();
	double nextY = points()->getItem(nextPoint)->y();
	const double epsilon = DBL_EPSILON;

	if(fabs(x - nextX) < epsilon && fabs(y - nextY) < epsilon)
		return findOutSlope(nextPoint, outSlope);
	else
	{
		double slope = SVGAngleImpl::todeg(atan2(nextY - y, nextX - x));
		*outSlope = slope;
		return true;
	}
}

bool SVGPolyElementImpl::findInSlope(unsigned int point, double *inSlope) const
{
	unsigned int prevPoint;

	if(point == 0)
	{
		if(m_isOpenPath)
			return false;
		else
			prevPoint = points()->numberOfItems() - 1;
	}
	else
		prevPoint = point - 1;

	if(point == prevPoint)
		return false;
	
	double x = points()->getItem(point)->x();
	double y = points()->getItem(point)->y();
	double prevX = points()->getItem(prevPoint)->x();
	double prevY = points()->getItem(prevPoint)->y();
	const double epsilon = DBL_EPSILON;

	if(fabs(x - prevX) < epsilon && fabs(y - prevY) < epsilon)
		return findInSlope(prevPoint, inSlope);
	else
	{
		double slope = SVGAngleImpl::todeg(atan2(y - prevY, x - prevX));
		*inSlope = slope;
		return true;
	}
}