author Daniel Holbert <>
Wed, 28 Apr 2010 16:00:54 -0700
changeset 41504 6b47c52ef03af1a21cf67e12614d299fbfb22e5a
child 41767 dab170bd41bff5dcdf61653661ecc04b05e9f971
permissions -rw-r--r--
Bug 436418, patch E: SVG/SMIL animateMotion - add support for <animateMotion> element and its core logic. r=roc

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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 * The Original Code is the Mozilla SVG project.
 * The Initial Developer of the Original Code is the Mozilla Foundation.
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 * the Initial Developer. All Rights Reserved.
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 *   Daniel Holbert <>
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/* Helper class to help with generating anonymous path elements for
   <animateMotion> elements to use. */


#include "nsSMILParserUtils.h"
#include "nsAutoPtr.h"
#include "nsTArray.h"
#include "nsDebug.h"
#include "gfxContext.h"
#include "nsSVGUtils.h"

class nsSVGElement;
class nsIContent;
class nsIDocument;
class nsAString;

namespace mozilla {

class SVGMotionSMILPathUtils {
  // Class to assist in generating a gfxFlattenedPath, based on
  // coordinates in the <animateMotion> from/by/to/values attributes.
  class PathGenerator {
    PathGenerator(nsSVGElement* aSVGElement)
      : mSVGElement(aSVGElement),

    // Methods for adding various path commands to output path.
    // Note: aCoordPairStr is expected to be a whitespace and/or
    // comma-separated x,y coordinate-pair -- see description of
    // "the specified values for from, by, to, and values" at
    void   MoveToOrigin();
    PRBool MoveToAbsolute(const nsAString& aCoordPairStr);
    PRBool LineToAbsolute(const nsAString& aCoordPairStr,
                          double& aSegmentDistance);
    PRBool LineToRelative(const nsAString& aCoordPairStr,
                          double& aSegmentDistance);

    // Accessor to let clients check if we've received any commands yet.
    inline PRBool HaveReceivedCommands() { return mHaveReceivedCommands; }
    // Accessor to get the finalized path
    already_AddRefed<gfxFlattenedPath> GetResultingPath();

    // Helper methods
    PRBool ParseCoordinatePair(const nsAString& aStr,
                               float& aXVal, float& aYVal);

    PRBool AppendCommand(const nsACString& aCommandStr,
                         const nsAString&  aCoordPairStr);

    // Member data
    nsSVGElement* mSVGElement; // context for converting out of relative units
    gfxContext    mGfxContext;
    PRPackedBool  mHaveReceivedCommands;

  // Class to assist in passing each subcomponent of a |values| attribute to
  // a PathGenerator, for generating a corresponding gfxFlattenedPath.
  class MotionValueParser : public nsSMILParserUtils::GenericValueParser
    MotionValueParser(PathGenerator* aPathGenerator,
                      nsTArray<double>* aPointDistances)
      : mPathGenerator(aPathGenerator),
                        "expecting point distances array to start empty");

    // nsSMILParserUtils::GenericValueParser interface
    virtual nsresult Parse(const nsAString& aValueStr);

    PathGenerator*    mPathGenerator;
    nsTArray<double>* mPointDistances;
    double            mDistanceSoFar;


} // namespace mozilla