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221 lines
7.5 KiB
221 lines
7.5 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkViewDependentErrorMetric.cxx,v $
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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#include "vtkViewDependentErrorMetric.h"
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#include "vtkObjectFactory.h"
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#include "vtkGenericAttribute.h"
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#include "vtkGenericAttributeCollection.h"
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#include "vtkGenericAdaptorCell.h"
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#include "vtkGenericDataSet.h"
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#include "vtkMath.h"
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#include <assert.h>
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#include "vtkCoordinate.h"
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#include "vtkViewport.h"
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vtkCxxRevisionMacro(vtkViewDependentErrorMetric,"$Revision: 1.7 $");
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vtkStandardNewMacro(vtkViewDependentErrorMetric);
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//-----------------------------------------------------------------------------
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vtkViewDependentErrorMetric::vtkViewDependentErrorMetric()
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{
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this->PixelTolerance = 0.25; // arbitrary positive value
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this->Viewport = 0;
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this->Coordinate = vtkCoordinate::New();
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this->Coordinate->SetCoordinateSystemToWorld();
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}
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//-----------------------------------------------------------------------------
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vtkViewDependentErrorMetric::~vtkViewDependentErrorMetric()
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{
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this->Coordinate->Delete();
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}
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//-----------------------------------------------------------------------------
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// Description:
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// Set the squared screen-based geometric accuracy measured in pixels.
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// Subdivision will be required if the square distance between the projection
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// of the real point and the straight line passing through the projection
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// of the vertices of the edge is greater than `value'.
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// For instance, 0.25 will give better result than 1.
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// \pre positive_value: value>0
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void vtkViewDependentErrorMetric::SetPixelTolerance(double value)
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{
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assert("pre: positive_value" && value>0);
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if(this->PixelTolerance!=value)
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{
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this->PixelTolerance=value;
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this->Modified();
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}
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}
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//-----------------------------------------------------------------------------
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// Avoid reference loop
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void vtkViewDependentErrorMetric::SetViewport(vtkViewport *viewport)
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{
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if(this->Viewport!=viewport)
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{
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this->Viewport = viewport;
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this->Modified();
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}
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}
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//-----------------------------------------------------------------------------
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int vtkViewDependentErrorMetric::RequiresEdgeSubdivision(double *leftPoint,
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double *midPoint,
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double *rightPoint,
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double vtkNotUsed(alpha))
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{
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assert("pre: leftPoint_exists" && leftPoint!=0);
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assert("pre: midPoint_exists" && midPoint!=0);
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assert("pre: rightPoint_exists" && rightPoint!=0);
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// assert("pre: clamped_alpha" && alpha>0 && alpha<1); // or else true
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if( this->GenericCell->IsGeometryLinear() )
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{
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//don't need to do anything:
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return 0;
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}
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#if 0
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if( !this->RayFrustumIntersection(leftPoint,rightPoint,frustum) && !this->PointFrustumIntersection(midPoint,frustum))
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{
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// not in the frustum, don't need subdivision
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return 0;
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}
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#endif
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// Get the projection of the left, mid and right points
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double leftProjPoint[2];
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double midProjPoint[2];
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// double rightProjPoint[2];
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this->Coordinate->SetValue(leftPoint);
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double *pix = this->Coordinate->GetComputedDoubleDisplayValue(this->Viewport);
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// pix is a volatile pointer
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leftProjPoint[0] = pix[0];
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leftProjPoint[1] = pix[1];
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this->Coordinate->SetValue(midPoint);
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pix = this->Coordinate->GetComputedDoubleDisplayValue(this->Viewport);
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// pix is a volatile pointer
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midProjPoint[0] = pix[0];
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midProjPoint[1] = pix[1];
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this->Coordinate->SetValue(rightPoint);
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pix = this->Coordinate->GetComputedDoubleDisplayValue(this->Viewport);
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// distance between the line (leftProjPoint,rightProjPoint) and the point midProjPoint.
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return this->Distance2LinePoint(leftProjPoint,pix,midProjPoint)>this->PixelTolerance;
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}
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//-----------------------------------------------------------------------------
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// Description:
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// Return the error at the mid-point. The type of error depends on the state
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// of the concrete error metric. For instance, it can return an absolute
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// or relative error metric.
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// See RequiresEdgeSubdivision() for a description of the arguments.
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// \pre leftPoint_exists: leftPoint!=0
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// \pre midPoint_exists: midPoint!=0
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// \pre rightPoint_exists: rightPoint!=0
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// \pre clamped_alpha: alpha>0 && alpha<1
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// \pre valid_size: sizeof(leftPoint)=sizeof(midPoint)=sizeof(rightPoint)
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// =GetAttributeCollection()->GetNumberOfPointCenteredComponents()+6
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// \post positive_result: result>=0
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double vtkViewDependentErrorMetric::GetError(double *leftPoint,
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double *midPoint,
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double *rightPoint,
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double vtkNotUsed(alpha))
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{
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assert("pre: leftPoint_exists" && leftPoint!=0);
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assert("pre: midPoint_exists" && midPoint!=0);
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assert("pre: rightPoint_exists" && rightPoint!=0);
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// assert("pre: clamped_alpha" && alpha>0 && alpha<1); // or else true
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if( this->GenericCell->IsGeometryLinear() )
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{
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//don't need to do anything:
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return 0;
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}
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// Get the projection of the left, mid and right points
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double leftProjPoint[2];
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double midProjPoint[2];
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// double rightProjPoint[2];
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this->Coordinate->SetValue(leftPoint);
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double *pix = this->Coordinate->GetComputedDoubleDisplayValue(this->Viewport);
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// pix is a volatile pointer
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leftProjPoint[0] = pix[0];
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leftProjPoint[1] = pix[1];
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this->Coordinate->SetValue(midPoint);
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pix = this->Coordinate->GetComputedDoubleDisplayValue(this->Viewport);
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// pix is a volatile pointer
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midProjPoint[0] = pix[0];
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midProjPoint[1] = pix[1];
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this->Coordinate->SetValue(rightPoint);
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pix = this->Coordinate->GetComputedDoubleDisplayValue(this->Viewport);
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// distance between the line (leftProjPoint,rightProjPoint) and the point midProjPoint.
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return this->Distance2LinePoint(leftProjPoint,pix,midProjPoint);
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}
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//-----------------------------------------------------------------------------
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// Description:
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// Square distance between a straight line (defined by points x and y)
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// and a point z. Property: if x and y are equal, the line is a point and
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// the result is the square distance between points x and z.
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double vtkViewDependentErrorMetric::Distance2LinePoint(double x[2],
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double y[2],
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double z[2])
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{
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double u[2];
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double v[2];
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double w[2];
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u[0] = y[0] - x[0];
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u[1] = y[1] - x[1];
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vtkMath::Normalize2D(u);
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v[0] = z[0] - x[0];
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v[1] = z[1] - x[1];
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double dot = vtkMath::Dot2D(u,v);
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w[0] = v[0] - dot*u[0];
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w[1] = v[1] - dot*u[1];
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return vtkMath::Dot2D(w,w);
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}
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//-----------------------------------------------------------------------------
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void vtkViewDependentErrorMetric::PrintSelf(ostream& os, vtkIndent indent)
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{
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this->Superclass::PrintSelf(os,indent);
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os << indent << "PixelTolerance: " << this->PixelTolerance << endl;
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os << indent << "ViewPort: ";
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if( this->Viewport )
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{
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this->Viewport->PrintSelf( os << endl, indent.GetNextIndent());
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}
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else
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{
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os << "(none)" << endl;
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}
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}
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