author | chetan.kapoor@v800025.ad-sfpd.intra |
Tue, 27 Oct 2009 10:58:40 +0000 | |
branch | CompilerCompatibility |
changeset 25 | 9d87bae3dc1b |
parent 0 | dd21522fd290 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2006 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of the License "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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#include "config.h" |
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#include "Path.h" |
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#include "PathSymbian.h" |
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using namespace WebCore; |
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/* |
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The following code is based on an algorithm presented in "Algorithms" by Robert Sedgewick, |
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Addison-Wesley, 1988, 2nd ed. ISBN 0201066734 |
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*/ |
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bool pointInPolygon(WTF::Vector<FloatPoint>& rgpts, const FloatPoint& ptTest); |
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bool pointInPolyRect(WTF::Vector<FloatPoint>& rgpts, const FloatPoint& ptTest, FloatRect *prbound) ; |
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bool intersects(const FloatPoint& p1, const FloatPoint& p2, const FloatPoint& p3, const FloatPoint& p4) ; |
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int CCW(const FloatPoint& p0, const FloatPoint& p1, const FloatPoint& p2) ; |
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bool pointInPolygon(WTF::Vector<FloatPoint>& rgpts, const FloatPoint& ptTest) |
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{ |
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int wnumpts = rgpts.size(); |
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if (!wnumpts) |
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return false; |
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FloatRect r; |
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int i ; |
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FloatPoint pt1, pt2 ; |
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int wnumintsct = 0 ; |
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if (!pointInPolyRect(rgpts,ptTest,&r)) return false; |
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pt1 = ptTest ; |
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pt2 = FloatPoint(r.right() + 50, ptTest.y()) ; |
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// Now go through each of the lines in the polygon and see if it |
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// intersects |
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for (i = 0 ; i < wnumpts-1 ; i++) { |
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if (intersects(pt1, pt2, rgpts[i], rgpts[i+1])) |
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wnumintsct++ ; |
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} |
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// And the last line |
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if (intersects(pt1, pt2, rgpts[wnumpts-1], rgpts[0])) |
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wnumintsct++ ; |
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return (wnumintsct&1) ; |
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} |
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bool pointInPolyRect(WTF::Vector<FloatPoint>& rgpts, const FloatPoint& ptTest, FloatRect *res) |
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{ |
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int wnumpts = rgpts.size(); |
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if (!wnumpts) |
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return false; |
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FloatRect r ; |
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int xmin, xmax, ymin, ymax ; |
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FloatPoint *ppt ; |
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int i ; |
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xmin = ymin = INT_MAX ; |
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xmax = ymax = -INT_MAX ; |
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for (i=0; i < wnumpts ; i++) { |
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ppt = &rgpts[i]; |
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if (ppt->x() < xmin) |
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xmin = ppt->x() ; |
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if (ppt->x() > xmax) |
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xmax = ppt->x() ; |
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if (ppt->y() < ymin) |
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ymin = ppt->y() ; |
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if (ppt->y() > ymax) |
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ymax = ppt->y() ; |
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} |
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r = FloatRect(xmin, ymin, xmax-xmin, ymax-ymin); |
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if (res) |
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*res = r; |
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return r.contains(ptTest.x(),ptTest.y()); |
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} |
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bool intersects(const FloatPoint& p1, const FloatPoint& p2, const FloatPoint& p3, const FloatPoint& p4) |
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{ |
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return ((( CCW(p1, p2, p3) * CCW(p1, p2, p4)) <= 0) |
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&& (( CCW(p3, p4, p1) * CCW(p3, p4, p2) <= 0) )) ; |
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} |
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int CCW(const FloatPoint& p0, const FloatPoint& p1, const FloatPoint& p2) |
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|
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{ |
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int dx1, dx2 ; |
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int dy1, dy2 ; |
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|
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dx1 = p1.x() - p0.x() ; dx2 = p2.x() - p0.x() ; |
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dy1 = p1.y() - p0.y() ; dy2 = p2.y() - p0.y() ; |
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/* This is basically a slope comparison: we don't do divisions because |
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* of divide by zero possibilities with pure horizontal and pure |
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* vertical lines. |
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*/ |
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return ((dx1 * dy2 > dy1 * dx2) ? 1 : -1) ; |
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} |
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|
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// FIXME: PlatformPath only supports Rectangle, Ellipse and Polygon right now |
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PlatformPath::~PlatformPath() |
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{ |
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} |
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void PlatformPath::addRect( const FloatRect& rect ) |
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{ |
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m_type = Rectangle; |
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m_boundingRect = rect; |
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} |
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|
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bool PlatformPath::contains( const FloatPoint& point, WindRule rule ) |
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{ |
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if( m_type == Rectangle ) |
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return m_boundingRect.contains( point ); |
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else if( m_type == Polygon ) |
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return pointInPolygon( m_points, point ); |
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else if( m_type == Ellipse ) { |
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/** |
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in order for point(x,y) to stay in the ellipse, |
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it has to fulfill the ellipse equation: |
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sqr(dx)/sqr(a) + sqr(dy)/sqr(b) <= 1 |
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where 'a' is half the long axis of the ellipse, and 'b' is half the short axis |
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x = a * cos(t) and y = b * sin(t) |
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(see "http://www.3dsoftware.com/Math/PlaneCurves/EllipseAlgebra" for details) |
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**/ |
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const FloatRect& r = m_boundingRect; |
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int r2x = (r.width() * r.width()) / 4; // sqr(a) |
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int r2y = (r.height() * r.height()) / 4; // sqr(b) |
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|
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if (!r2x || !r2y) /*avoid division by zero*/ |
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return false; |
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|
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int cx = (r.x() + r.width()/2); // center of ellipse, x |
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int cy = (r.y() + r.height()/2); // center of ellipse, y |
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int dx = point.x() - cx; // dx |
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int dy = point.y() - cy; // dy |
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return (dx*dx*r2y + dy*dy*r2x <= r2x*r2y); |
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} |
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else |
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return false; |
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} |
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|
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void PlatformPath::addLineTo( const FloatPoint& point ) |
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{ |
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if( m_type == Unknown ) |
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m_type = Polygon; |
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|
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m_points.append( point ); |
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} |
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|
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void PlatformPath::addEllipse( const FloatRect& rect ) |
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{ |
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m_type = Ellipse; |
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m_boundingRect = rect; |
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} |
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|
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void PlatformPath::closeSubPath() |
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{ |
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// since the above intersection algorithm takes an extra step to test |
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// last line segment in this polygon, we don't need to close the polygon here. |
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} |
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|
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void PlatformPath::translate( const FloatSize& sz ) |
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{ |
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float deltaX = sz.width(); |
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float deltaY = sz.height(); |
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|
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if (m_type == Polygon) { |
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for (int i = 0 ; i < m_points.size() ; i++) { |
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m_points[i] = FloatPoint(m_points[i].x()+deltaX, m_points[i].y()+deltaY); |
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} |
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} else { |
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m_boundingRect.setX(m_boundingRect.x()+deltaX); |
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m_boundingRect.setY(m_boundingRect.y()+deltaY); |
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} |
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} |
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|
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// WebCore::Path member functions |
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|
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Path::Path() |
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{ |
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m_path = new PlatformPath(); |
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} |
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|
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Path::~Path() |
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{ |
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delete m_path; |
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} |
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Path::Path(const Path& p) |
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{ |
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m_path = new PlatformPath(); |
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// deep copy |
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*m_path = *(p.m_path); |
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} |
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Path& Path::operator=(const Path& other) |
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{ |
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if( !m_path ) |
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m_path = new PlatformPath(); |
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// deep copy |
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*m_path = *(other.m_path); |
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return *this; |
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} |
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bool Path::contains(const FloatPoint& point, WindRule rule) const |
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{ |
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return m_path->contains( point, rule ); |
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} |
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void Path::addRect(const FloatRect& rect) |
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{ |
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m_path->addRect( rect ); |
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} |
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FloatRect Path::boundingRect() const |
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{ |
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return m_path->m_boundingRect; |
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} |
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void Path::translate(const FloatSize& sz) |
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{ |
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m_path->translate( sz ); |
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} |
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void Path::addEllipse(const FloatRect& rect ) |
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{ |
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m_path->addEllipse( rect ); |
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} |
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void Path::addLineTo(const FloatPoint& point) |
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{ |
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m_path->addLineTo( point ); |
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} |
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void Path::closeSubpath() |
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{ |
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m_path->closeSubPath(); |
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} |
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void Path::clear() |
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{ |
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m_path->m_type = PlatformPath::Unknown; |
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m_path->m_points.clear(); |
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m_path->m_boundingRect = FloatRect(); |
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} |
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// END OF FILE |