C++ SVGTransform::type方法代码示例

void SVGTransformDistance::addSVGTransform(const SVGTransform& transform, bool absoluteValue)
{
    // If this is the first add, set the type for this SVGTransformDistance
    if (m_type == SVGTransform::SVG_TRANSFORM_UNKNOWN)
        m_type = transform.type();
    
    ASSERT(m_type == transform.type());
    
    switch (m_type) {
    case SVGTransform::SVG_TRANSFORM_UNKNOWN:
        return;
    case SVGTransform::SVG_TRANSFORM_MATRIX:
        m_transform *= transform.matrix(); // FIXME: what does 'distance' between two transforms mean?  how should we respect 'absoluteValue' here?
        return;
    case SVGTransform::SVG_TRANSFORM_ROTATE:
        m_angle += absoluteValue ? fabsf(transform.angle()) : transform.angle();
        m_cx += absoluteValue ? fabsf(transform.rotationCenter().x()) : transform.rotationCenter().x();
        m_cy += absoluteValue ? fabsf(transform.rotationCenter().y()) : transform.rotationCenter().y();
        // fall through
    case SVGTransform::SVG_TRANSFORM_TRANSLATE:
    {
        float dx = absoluteValue ? fabsf(transform.translate().x()) : transform.translate().x();
        float dy = absoluteValue ? fabsf(transform.translate().y()) : transform.translate().y();
        m_transform.translate(dx, dy);
        return;
    }
    case SVGTransform::SVG_TRANSFORM_SCALE:
    {
        float scaleX = absoluteValue ? fabsf(transform.scale().width()) : transform.scale().width();
        float scaleY = absoluteValue ? fabsf(transform.scale().height()) : transform.scale().height();
        m_transform.scaleNonUniform(scaleX, scaleY);
        return;
    }
    case SVGTransform::SVG_TRANSFORM_SKEWX:
    case SVGTransform::SVG_TRANSFORM_SKEWY:
        m_angle += absoluteValue ? fabsf(transform.angle()) : transform.angle();
        return;
    }
    
    ASSERT_NOT_REACHED();
    return;
}

SVGTransform SVGTransformDistance::addSVGTransforms(const SVGTransform& first, const SVGTransform& second)
{
    ASSERT(first.type() == second.type());
    
    SVGTransform transform;
    
    switch (first.type()) {
    case SVGTransform::SVG_TRANSFORM_UNKNOWN:
        return SVGTransform();
    case SVGTransform::SVG_TRANSFORM_ROTATE:
    {
        transform.setRotate(first.angle() + second.angle(), first.rotationCenter().x() + second.rotationCenter().x(),
                            first.rotationCenter().y() + second.rotationCenter().y());
        return transform;
    }
    case SVGTransform::SVG_TRANSFORM_MATRIX:
        transform.setMatrix(first.matrix() * second.matrix());
        return transform;
    case SVGTransform::SVG_TRANSFORM_TRANSLATE:
    {
        float dx = first.translate().x() + second.translate().x();
        float dy = first.translate().y() + second.translate().y();
        transform.setTranslate(dx, dy);
        return transform;
    }
    case SVGTransform::SVG_TRANSFORM_SCALE:
    {
        FloatSize scale = first.scale() + second.scale();
        transform.setScale(scale.width(), scale.height());
        return transform;
    }
    case SVGTransform::SVG_TRANSFORM_SKEWX:
        transform.setSkewX(first.angle() + second.angle());
        return transform;
    case SVGTransform::SVG_TRANSFORM_SKEWY:
        transform.setSkewY(first.angle() + second.angle());
        return transform;
    }
    
    ASSERT_NOT_REACHED();
    return SVGTransform();
}

String SVGTransformList::valueAsString() const
{
    // TODO: We may want to build a real transform string, instead of concatting to a matrix(...).
    SVGTransform transform = concatenate();
    if (transform.type() == SVGTransform::SVG_TRANSFORM_MATRIX) {
        TransformationMatrix matrix = transform.matrix();
        return String::format("matrix(%f %f %f %f %f %f)", matrix.a(), matrix.b(), matrix.c(), matrix.d(), matrix.e(), matrix.f());
    }

    return String();
}

SVGTransformDistance::SVGTransformDistance(const SVGTransform& fromSVGTransform, const SVGTransform& toSVGTransform)
    : m_type(fromSVGTransform.type())
    , m_angle(0)
    , m_cx(0)
    , m_cy(0)
{
    ASSERT(m_type == toSVGTransform.type());
    
    switch (m_type) {
    case SVGTransform::SVG_TRANSFORM_UNKNOWN:
        return;
    case SVGTransform::SVG_TRANSFORM_MATRIX:
        // FIXME: need to be able to subtract to matrices
        return;
    case SVGTransform::SVG_TRANSFORM_ROTATE:
    {
        FloatSize centerDistance = toSVGTransform.rotationCenter() - fromSVGTransform.rotationCenter();
        m_angle = toSVGTransform.angle() - fromSVGTransform.angle();
        m_cx = centerDistance.width();
        m_cy = centerDistance.height();
        return;
    }
    case SVGTransform::SVG_TRANSFORM_TRANSLATE:
    {
        FloatSize translationDistance = toSVGTransform.translate() - fromSVGTransform.translate();
        m_transform.translate(translationDistance.width(), translationDistance.height());
        return;
    }
    case SVGTransform::SVG_TRANSFORM_SCALE:
    {
        float scaleX = toSVGTransform.scale().width() - fromSVGTransform.scale().width();        
        float scaleY = toSVGTransform.scale().height() - fromSVGTransform.scale().height();
        m_transform.scaleNonUniform(scaleX, scaleY);
        return;
    }
    case SVGTransform::SVG_TRANSFORM_SKEWX:
    case SVGTransform::SVG_TRANSFORM_SKEWY:
        m_angle = toSVGTransform.angle() - fromSVGTransform.angle();
        return;
    }
}

float SVGAnimateTransformElement::calculateDistance(const String& fromString, const String& toString)
{
    // FIXME: This is not correct in all cases. The spec demands that each component (translate x and y for example) 
    // is paced separately. To implement this we need to treat each component as individual animation everywhere.
    SVGTransform from = parseTransformValue(fromString);
    if (!from.isValid())
        return -1.f;
    SVGTransform to = parseTransformValue(toString);
    if (!to.isValid() || from.type() != to.type())
        return -1.f;
    if (to.type() == SVGTransform::SVG_TRANSFORM_TRANSLATE) {
        FloatSize diff = to.translate() - from.translate();
        return sqrtf(diff.width() * diff.width() + diff.height() * diff.height());
    }
    if (to.type() == SVGTransform::SVG_TRANSFORM_ROTATE)
        return fabsf(to.angle() - from.angle());
    if (to.type() == SVGTransform::SVG_TRANSFORM_SCALE) {
        FloatSize diff = to.scale() - from.scale();
        return sqrtf(diff.width() * diff.width() + diff.height() * diff.height());
    }
    return -1.f;
}

SVGTransformDistance::SVGTransformDistance(const SVGTransform& fromSVGTransform, const SVGTransform& toSVGTransform)
    : m_type(fromSVGTransform.type())
    , m_angle(0)
    , m_cx(0)
    , m_cy(0)
{
    ASSERT(m_type == toSVGTransform.type());
    
    switch (m_type) {
    case SVGTransform::SVG_TRANSFORM_MATRIX:
        ASSERT_NOT_REACHED();
    case SVGTransform::SVG_TRANSFORM_UNKNOWN:
        break;
    case SVGTransform::SVG_TRANSFORM_ROTATE: {
        FloatSize centerDistance = toSVGTransform.rotationCenter() - fromSVGTransform.rotationCenter();
        m_angle = toSVGTransform.angle() - fromSVGTransform.angle();
        m_cx = centerDistance.width();
        m_cy = centerDistance.height();
        break;
    }
    case SVGTransform::SVG_TRANSFORM_TRANSLATE: {
        FloatSize translationDistance = toSVGTransform.translate() - fromSVGTransform.translate();
        m_transform.translate(translationDistance.width(), translationDistance.height());
        break;
    }
    case SVGTransform::SVG_TRANSFORM_SCALE: {
        float scaleX = toSVGTransform.scale().width() - fromSVGTransform.scale().width();        
        float scaleY = toSVGTransform.scale().height() - fromSVGTransform.scale().height();
        m_transform.scaleNonUniform(scaleX, scaleY);
        break;
    }
    case SVGTransform::SVG_TRANSFORM_SKEWX:
    case SVGTransform::SVG_TRANSFORM_SKEWY:
        m_angle = toSVGTransform.angle() - fromSVGTransform.angle();
        break;
    }
}

SVGTransform SVGTransformDistance::addToSVGTransform(const SVGTransform& transform) const
{
    ASSERT(m_type == transform.type() || transform == SVGTransform());
    
    SVGTransform newTransform(transform);
    
    switch (m_type) {
    case SVGTransform::SVG_TRANSFORM_UNKNOWN:
        return SVGTransform();
    case SVGTransform::SVG_TRANSFORM_MATRIX:
        return SVGTransform(transform.matrix() * m_transform);
    case SVGTransform::SVG_TRANSFORM_TRANSLATE:
    {
        FloatPoint translation = transform.translate();
        translation += FloatSize::narrowPrecision(m_transform.e(), m_transform.f());
        newTransform.setTranslate(translation.x(), translation.y());
        return newTransform;
    }
    case SVGTransform::SVG_TRANSFORM_SCALE:
    {
        FloatSize scale = transform.scale();
        scale += FloatSize::narrowPrecision(m_transform.a(), m_transform.d());
        newTransform.setScale(scale.width(), scale.height());
        return newTransform;
    }
    case SVGTransform::SVG_TRANSFORM_ROTATE:
    {
        // FIXME: I'm not certain the translation is calculated correctly here
        FloatPoint center = transform.rotationCenter();
        newTransform.setRotate(transform.angle() + m_angle,
                               center.x() + m_cx,
                               center.y() + m_cy);
        return newTransform;
    }
    case SVGTransform::SVG_TRANSFORM_SKEWX:
        newTransform.setSkewX(transform.angle() + m_angle);
        return newTransform;
    case SVGTransform::SVG_TRANSFORM_SKEWY:
        newTransform.setSkewY(transform.angle() + m_angle);
        return newTransform;
    }
    
    ASSERT_NOT_REACHED();
    return SVGTransform();
}