Method PickObject

trinity/Sprite2d/Tr2Sprite2dScene.cpp:295–380

}

ITr2SpriteObject* Tr2Sprite2dScene::PickObject( int x, int y, const TriProjection* proj, const TriView* view, const TriViewport* vp, Be::Optional<int> )
{
	CCP_ASSERT( m_transformStack->empty() );

	float finalX;
	float finalY;
	if( !m_is2dPick )
	{
		float fx, fy;
		Vector3 startWorld;
		Vector3 dirWorld;

		gTriDev->ScreenToProjection( x, y, &fx, &fy, vp );

		Matrix worldTransform = TransformationMatrix( m_scaling, m_rotation, m_translation );

		Matrix worldViewTransform;
		Matrix viewTransform = view->GetTransform();
		worldViewTransform = worldTransform * viewTransform;

		Matrix worldViewProjectionTransform;
		Matrix projectionTransform = proj->GetTransform();
		worldViewProjectionTransform = worldViewTransform * projectionTransform;

		Matrix invWorldViewProjectionTransform = Inverse( worldViewProjectionTransform );

		Vector3 rayStart = TransformCoord( Vector3( fx, fy, 0.0f ), invWorldViewProjectionTransform );

		Vector3 rayEnd = TransformCoord( Vector3( fx, fy, 0.5f ), invWorldViewProjectionTransform );

		float slopeX = ( rayEnd.z - rayStart.z ) / ( rayEnd.x - rayStart.x );
		finalX = ( slopeX * rayStart.x - rayStart.z ) / slopeX;

		float slopeY = ( rayEnd.z - rayStart.z ) / ( rayEnd.y - rayStart.y );
		finalY = ( slopeY * rayStart.y - rayStart.z ) / slopeY;

		finalY = 1.0f - finalY;

		if( m_is2dRender )
		{
			finalX *= m_displayWidth;
			finalY *= m_displayHeight;
			finalX += m_displayWidth / 2.0f;
			finalY -= m_displayHeight / 2.0f;
		}
		else
		{
			// Rendering
			finalX += m_displayWidth / 2.0f;
			finalY += m_displayHeight / 2.0f;
		}

		extern ITr2DebugRendererPtr g_debugRenderer;
		if( g_debugRenderer )
		{
			g_debugRenderer->DrawLine( rayStart, rayEnd );
			g_debugRenderer->Printf( 50, 50, 0xffffffff, "%d, %d, %d, %d", vp->x, vp->y, vp->width, vp->height );
			g_debugRenderer->Printf( 50, 60, 0xffffffff, "%4.2f, %4.2f, %4.2f", rayStart.x, rayStart.y, rayStart.z );