1 /* 2 * Copyright (C) Research In Motion Limited 2010. All rights reserved. 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Library General Public 6 * License as published by the Free Software Foundation; either 7 * version 2 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Library General Public License for more details. 13 * 14 * You should have received a copy of the GNU Library General Public License 15 * along with this library; see the file COPYING.LIB. If not, write to 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 17 * Boston, MA 02110-1301, USA. 18 */ 19 20 #ifndef SVGMarkerData_h 21 #define SVGMarkerData_h 22 23 #if ENABLE(SVG) 24 #include "FloatConversion.h" 25 #include "Path.h" 26 #include <wtf/MathExtras.h> 27 28 namespace WebCore { 29 30 class RenderSVGResourceMarker; 31 32 class SVGMarkerData { 33 public: 34 enum Type { 35 Unknown = 0, 36 Start, 37 Mid, 38 End 39 }; 40 41 SVGMarkerData(const Type& type = Unknown, RenderSVGResourceMarker* marker = 0) m_type(type)42 : m_type(type) 43 , m_marker(marker) 44 { 45 } 46 origin()47 FloatPoint origin() const { return m_origin; } marker()48 RenderSVGResourceMarker* marker() const { return m_marker; } 49 currentAngle()50 float currentAngle() const 51 { 52 FloatSize inslopeChange = m_inslopePoints[1] - m_inslopePoints[0]; 53 FloatSize outslopeChange = m_outslopePoints[1] - m_outslopePoints[0]; 54 55 double inslope = rad2deg(atan2(inslopeChange.height(), inslopeChange.width())); 56 double outslope = rad2deg(atan2(outslopeChange.height(), outslopeChange.width())); 57 58 double angle = 0; 59 switch (m_type) { 60 case Start: 61 angle = outslope; 62 break; 63 case Mid: 64 angle = (inslope + outslope) / 2; 65 break; 66 case End: 67 angle = inslope; 68 break; 69 default: 70 ASSERT_NOT_REACHED(); 71 break; 72 } 73 74 return narrowPrecisionToFloat(angle); 75 } 76 updateTypeAndMarker(const Type & type,RenderSVGResourceMarker * marker)77 void updateTypeAndMarker(const Type& type, RenderSVGResourceMarker* marker) 78 { 79 m_type = type; 80 m_marker = marker; 81 } 82 updateOutslope(const FloatPoint & point)83 void updateOutslope(const FloatPoint& point) 84 { 85 m_outslopePoints[0] = m_origin; 86 m_outslopePoints[1] = point; 87 } 88 updateMarkerDataForPathElement(const PathElement * element)89 void updateMarkerDataForPathElement(const PathElement* element) 90 { 91 FloatPoint* points = element->points; 92 93 switch (element->type) { 94 case PathElementAddQuadCurveToPoint: 95 // FIXME: https://bugs.webkit.org/show_bug.cgi?id=33115 (PathElementAddQuadCurveToPoint not handled for <marker>) 96 m_origin = points[1]; 97 break; 98 case PathElementAddCurveToPoint: 99 m_inslopePoints[0] = points[1]; 100 m_inslopePoints[1] = points[2]; 101 m_origin = points[2]; 102 break; 103 case PathElementMoveToPoint: 104 m_subpathStart = points[0]; 105 case PathElementAddLineToPoint: 106 updateInslope(points[0]); 107 m_origin = points[0]; 108 break; 109 case PathElementCloseSubpath: 110 updateInslope(points[0]); 111 m_origin = m_subpathStart; 112 m_subpathStart = FloatPoint(); 113 } 114 } 115 116 private: updateInslope(const FloatPoint & point)117 void updateInslope(const FloatPoint& point) 118 { 119 m_inslopePoints[0] = m_origin; 120 m_inslopePoints[1] = point; 121 } 122 123 Type m_type; 124 RenderSVGResourceMarker* m_marker; 125 FloatPoint m_origin; 126 FloatPoint m_subpathStart; 127 FloatPoint m_inslopePoints[2]; 128 FloatPoint m_outslopePoints[2]; 129 }; 130 131 } 132 133 #endif // ENABLE(SVG) 134 #endif // SVGMarkerData_h 135