void Transform2D::ApplyAnchors(const Box& prevBounds)
{
const Transform2D* parent = m_node.GetParent();
const Transform2D* constThis = this;
if (nullptr == parent)
return;
const Box& parentBounds = parent->GetWorldBounds();
Box newBounds = constThis->GetWorldBounds();
// min.x
{
//
const float anchorInf = 1.0f - (m_anchor.lowerBound.x * 2.0f);
const float diff = parentBounds.lowerBound.x - prevBounds.lowerBound.x;
const float endDistance = diff * anchorInf;
m_dimensions.x += -endDistance;
newBounds.lowerBound.x += endDistance;
}
// max.x
{
const float anchorInf = 1.0f - ((1.0f - m_anchor.upperBound.x) * 2.0f);
const float diff = parentBounds.upperBound.x - prevBounds.upperBound.x;
const float endDistance = diff * anchorInf;
m_dimensions.x += endDistance;
newBounds.upperBound.x += endDistance;
}
// min.y
{
const float anchorInf = 1.0f - (m_anchor.lowerBound.y * 2.0f);
const float diff = parentBounds.lowerBound.y - prevBounds.lowerBound.y;
const float endDistance = diff * anchorInf;
m_dimensions.y += -endDistance;
newBounds.lowerBound.y += endDistance;
}
// max.y
{
const float anchorInf = 1.0f - ((1.0f - m_anchor.upperBound.y) * 2.0f);
const float diff = parentBounds.upperBound.y - prevBounds.upperBound.y;
const float endDistance = diff * anchorInf;
m_dimensions.y += endDistance;
newBounds.upperBound.y += endDistance;
}
m_position = (newBounds.CalculatePointWithPivot(m_pivot) - parentBounds.CalculateCenter()) / parent->GetWorldTransform().CalculateScale();
}
