Imath::M33f Transform2DPlug::matrix( const Imath::Box2i &displayWindow, double pixelAspect ) const
{
// We need to transform from image space (with 0x0 being the bottom left)
// to Gadget space (where 0x0 is the top left). To do this, we need to know the
// size of the Format.
///\todo: We don't handle the pixel aspect of the format here but we should!
float formatHeight = displayWindow.size().y + 1;
M33f p;
V2f pivotVec = pivotPlug()->getValue();
pivotVec.y = formatHeight - pivotVec.y;
p.translate( pivotVec );
M33f t;
V2f translateVec = translatePlug()->getValue();
translateVec.y *= -1.;
t.translate( translateVec );
M33f r;
r.rotate( IECore::degreesToRadians( rotatePlug()->getValue() ) );
M33f s;
s.scale( scalePlug()->getValue() );
M33f pi;
pi.translate( pivotVec*Imath::V2f(-1.f) );
M33f result = pi * s * r * t * p;
return result;
}
M33f ImagePrimitive::uvToPixelMatrix() const
{
M33f result;
const Box2i &displayWindow = getDisplayWindow();
V2i size = displayWindow.size() + V2i( 1 );
result.translate( V2f( displayWindow.min.x, displayWindow.min.y ) - V2f( 0.5f ) );
result.scale( V2f( size.x, size.y ) );
return result;
}
M33f ImagePrimitive::pixelToObjectMatrix() const
{
M33f result;
const Box2i &displayWindow = getDisplayWindow();
V2i size = displayWindow.size();
result.scale( V2f( 1.0f, -1.0f ) );
result.translate( -V2f( displayWindow.min.x, displayWindow.min.y ) - V2f( size.x, size.y ) / 2.0f );
return result;
}
M33f ImagePrimitive::uvToObjectMatrix() const
{
M33f result;
const Box2i &displayWindow = getDisplayWindow();
V2i size = displayWindow.size() + V2i( 1 );
result.scale( V2f( size.x, -size.y ) );
result.translate( V2f( -0.5f ) );
return result;
}
Imath::M33f Transform2DPlug::matrix() const
{
M33f p;
V2f pivotVec = pivotPlug()->getValue();
p.translate( pivotVec );
M33f t;
V2f translateVec = translatePlug()->getValue();
t.translate( translateVec );
M33f r;
r.rotate( IECore::degreesToRadians( rotatePlug()->getValue() ) );
M33f s;
s.scale( scalePlug()->getValue() );
M33f pi;
pi.translate( pivotVec*Imath::V2f(-1.f) );
M33f result = pi * s * r * t * p;
return result;
}
