khtml/svg/graphics/SVGResourceMarker.cpp

   1 /*
   2  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27
  28 #if ENABLE(SVG)
  29 #include "SVGResourceMarker.h"
  30
  31 #include "AffineTransform.h"
  32 #include "GraphicsContext.h"
  33 #include "RenderSVGViewportContainer.h"
  34 #include "TextStream.h"
  35
  36 namespace WebCore {
  37
  38 SVGResourceMarker::SVGResourceMarker()
  39     : SVGResource()
  40     , m_refX(0.0)
  41     , m_refY(0.0)
  42     , m_angle(-1) // just like using setAutoAngle()
  43     , m_marker(0)
  44     , m_useStrokeWidth(true)
  45 {
  46 }
  47
  48 SVGResourceMarker::~SVGResourceMarker()
  49 {
  50 }
  51
  52 void SVGResourceMarker::setMarker(RenderSVGViewportContainer* marker)
  53 {
  54     m_marker = marker;
  55 }
  56
  57 void SVGResourceMarker::setRef(double refX, double refY)
  58 {
  59     m_refX = refX;
  60     m_refY = refY;
  61 }
  62
  63 void SVGResourceMarker::draw(GraphicsContext* context, const FloatRect& rect, double x, double y, double strokeWidth, double angle)
  64 {
  65     if (!m_marker)
  66         return;
  67
  68     static HashSet<SVGResourceMarker*> currentlyDrawingMarkers;
  69
  70     // avoid drawing circular marker references
  71     if (currentlyDrawingMarkers.contains(this))
  72         return;
  73
  74     currentlyDrawingMarkers.add(this);
  75
  76     AffineTransform transform;
  77     transform.translate(x, y);
  78     transform.rotate(m_angle > -1 ? m_angle : angle);
  79
  80     // refX and refY are given in coordinates relative to the viewport established by the marker, yet they affect
  81     // the translation performed on the viewport itself.
  82     AffineTransform viewportTransform;
  83     if (m_useStrokeWidth)
  84         viewportTransform.scale(strokeWidth, strokeWidth);
  85     viewportTransform *= m_marker->viewportTransform();
  86     double refX, refY;
  87     viewportTransform.map(m_refX, m_refY, &refX, &refY);
  88     transform.translate(-refX, -refY);
  89
  90     if (m_useStrokeWidth)
  91         transform.scale(strokeWidth, strokeWidth);
  92
  93     // FIXME: PaintInfo should be passed into this method instead of being created here
  94     // FIXME: bounding box fractions are lost
  95     RenderObject::PaintInfo info(context, enclosingIntRect(rect), PaintPhaseForeground, 0, 0, 0);
  96
  97     context->save();
  98     context->concatCTM(transform);
  99     m_marker->setDrawsContents(true);
 100     m_marker->paint(info, 0, 0);
 101     m_marker->setDrawsContents(false);
 102     context->restore();
 103
 104     m_cachedBounds = transform.mapRect(m_marker->absoluteClippedOverflowRect());
 105
 106     currentlyDrawingMarkers.remove(this);
 107 }
 108
 109 FloatRect SVGResourceMarker::cachedBounds() const
 110 {
 111     return m_cachedBounds;
 112 }
 113
 114 TextStream& SVGResourceMarker::externalRepresentation(TextStream& ts) const
 115 {
 116     ts << "[type=MARKER]"
 117         << " [angle=";
 118
 119     if (angle() == -1)
 120         ts << "auto" << "]";
 121     else
 122         ts << angle() << "]";
 123
 124     ts << " [ref x=" << refX() << " y=" << refY() << "]";
 125     return ts;
 126 }
 127
 128 SVGResourceMarker* getMarkerById(Document* document, const AtomicString& id)
 129 {
 130     SVGResource* resource = getResourceById(document, id);
 131     if (resource && resource->isMarker())
 132         return static_cast<SVGResourceMarker*>(resource);
 133
 134     return 0;
 135 }
 136
 137 } // namespace WebCore
 138
 139 #endif