void SVGRenderingContext::clear2DRotation(AffineTransform& transform)
{
AffineTransform::DecomposedType decomposition;
transform.decompose(decomposition);
decomposition.angle = 0;
transform.recompose(decomposition);
}
void SVGImageBufferTools::clear2DRotation(AffineTransform& transform)
{
AffineTransform::DecomposedType decomposition;
transform.decompose(decomposition);
decomposition.angle = 0;
transform.recompose(decomposition);
}
void AffineTransform::blend(const AffineTransform& from, double progress)
{
DecomposedType srA, srB;
from.decompose(srA);
this->decompose(srB);
// If x-axis of one is flipped, and y-axis of the other, convert to an unflipped rotation.
if ((srA.scaleX < 0 && srB.scaleY < 0) || (srA.scaleY < 0 && srB.scaleX < 0)) {
srA.scaleX = -srA.scaleX;
srA.scaleY = -srA.scaleY;
srA.angle += srA.angle < 0 ? piDouble : -piDouble;
}
// Don't rotate the long way around.
srA.angle = fmod(srA.angle, 2 * piDouble);
srB.angle = fmod(srB.angle, 2 * piDouble);
if (fabs(srA.angle - srB.angle) > piDouble) {
if (srA.angle > srB.angle)
srA.angle -= piDouble * 2;
else
srB.angle -= piDouble * 2;
}
srA.scaleX += progress * (srB.scaleX - srA.scaleX);
srA.scaleY += progress * (srB.scaleY - srA.scaleY);
srA.angle += progress * (srB.angle - srA.angle);
srA.remainderA += progress * (srB.remainderA - srA.remainderA);
srA.remainderB += progress * (srB.remainderB - srA.remainderB);
srA.remainderC += progress * (srB.remainderC - srA.remainderC);
srA.remainderD += progress * (srB.remainderD - srA.remainderD);
srA.translateX += progress * (srB.translateX - srA.translateX);
srA.translateY += progress * (srB.translateY - srA.translateY);
this->recompose(srA);
}
