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vtkEllipticalButtonSource.cxx
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vtkEllipticalButtonSource.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkEllipticalButtonSource.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkEllipticalButtonSource.h"
#include "vtkCellArray.h"
#include "vtkFloatArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPoints.h"
#include "vtkPolyData.h"
#include "vtkTransform.h"
vtkStandardNewMacro(vtkEllipticalButtonSource);
//----------------------------------------------------------------------------
// Construct
vtkEllipticalButtonSource::vtkEllipticalButtonSource()
{
this->Width = 0.5;
this->Height = 0.5;
this->Depth = 0.05;
this->CircumferentialResolution = 4;
this->TextureResolution = 2;
this->ShoulderResolution = 2;
this->OutputPointsPrecision = SINGLE_PRECISION;
this->RadialRatio = 1.1;
}
//----------------------------------------------------------------------------
int vtkEllipticalButtonSource::RequestData(
vtkInformation *vtkNotUsed(request),
vtkInformationVector **vtkNotUsed(inputVector),
vtkInformationVector *outputVector)
{
vtkInformation *outInfo = outputVector->GetInformationObject(0);
int i, j;
vtkPolyData *output = vtkPolyData::SafeDownCast(
outInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkDebugMacro(<<"Generating elliptical button");
// Check input
if ( this->Width <= 0.0 || this->Height <= 0.0 )
{
vtkErrorMacro(<<"Button must have non-zero height and width");
return 1;
}
// Create the button in several steps. First, create the button in
// the x-y plane, this requires creating the texture region and then
// the shoulder region. After this, the z-depth is created. And if
// it is a two-sided button, then a mirror reflection of the button
// in the negative z-direction is created.
int numPts = 1 + this->CircumferentialResolution *
(this->TextureResolution + this->ShoulderResolution + 1);
if ( this->TwoSided ) { numPts *= 2; }
vtkPoints *newPts = vtkPoints::New();
// Set the desired precision for the points in the output.
if(this->OutputPointsPrecision == vtkAlgorithm::DOUBLE_PRECISION)
{
newPts->SetDataType(VTK_DOUBLE);
}
else
{
newPts->SetDataType(VTK_FLOAT);
}
newPts->SetNumberOfPoints(numPts);
vtkFloatArray *normals = vtkFloatArray::New();
normals->SetNumberOfComponents(3);
normals->SetNumberOfTuples(numPts);
vtkFloatArray *tcoords = vtkFloatArray::New();
tcoords->SetNumberOfComponents(2);
tcoords->SetNumberOfTuples(numPts);
vtkCellArray *newPolys = vtkCellArray::New();
newPolys->Allocate(this->CircumferentialResolution*
(this->TextureResolution*this->ShoulderResolution));
// Create the texture region. --------------------------------------------
// Start by determining the resolution in the width and height directions.
// Setup the ellipsoid.
double x[3], x0[3], x1[3], x2[3], x3[3], n[3];
this->A = this->Width / 2.0;
this->A2 = this->A * this->A;
this->B = this->Height / 2.0;
this->B2 = this->B*this->B;
this->C = this->Depth;
this->C2 = this->C*this->C;
double xP[3], dX, dY;
if ( this->TextureStyle == VTK_TEXTURE_STYLE_FIT_IMAGE )
{
dX = static_cast<double>(this->TextureDimensions[0]);
dY = static_cast<double>(this->TextureDimensions[1]);
}
else
{
dX = this->A;
dY = this->B;
}
int hRes = static_cast<int>(
ceil(this->CircumferentialResolution * (dY/(dY+dX)))) / 2;
hRes = (hRes <= 0 ? 1 : hRes);
int wRes = (this->CircumferentialResolution - 2*hRes) / 2;
// Create the center point
newPts->SetPoint(0,this->Center[0],this->Center[1],
this->Center[2]+this->Depth);
normals->SetTuple3(0, 0.0,0.0,1.0);
tcoords->SetTuple2(0, 0.5, 0.5);
// Set up for points interior to the texture
int offset = 1 + (this->TextureResolution-1)*this->CircumferentialResolution;
// Determine the lower-left corner of the texture region
double xe, ye;
double a = this->A/this->RadialRatio;
double b = this->B/this->RadialRatio;
this->IntersectEllipseWithLine(a*a,b*b,dX,dY,xe,ye);
x0[0] = this->Center[0] - xe;
x0[1] = this->Center[1] - ye;
x0[2] = this->ComputeDepth(1,x0[0],x0[1],n);
newPts->SetPoint(offset, x0);
normals->SetTuple(offset, n);
tcoords->SetTuple2(offset, 0.0, 0.0);
// Create the lower right point
x1[0] = this->Center[0] + xe;
x1[1] = this->Center[1] - ye;
x1[2] = this->ComputeDepth(1,x1[0],x1[1],n);
newPts->SetPoint(offset + wRes, x1);
normals->SetTuple(offset + wRes, n);
tcoords->SetTuple2(offset + wRes, 1.0, 0.0);
// Create the upper right point
x2[0] = this->Center[0] + xe;
x2[1] = this->Center[1] + ye;
x2[2] = this->ComputeDepth(1,x2[0],x2[1],n);
newPts->SetPoint(offset + wRes + hRes, x2);
normals->SetTuple(offset + wRes + hRes, n);
tcoords->SetTuple2(offset + wRes + hRes, 1.0, 1.0);
// Create the upper left point
x3[0] = this->Center[0] - xe;
x3[1] = this->Center[1] + ye;
x3[2] = this->ComputeDepth(1,x3[0],x3[1],n);
newPts->SetPoint(offset + 2*wRes + hRes, x3);
normals->SetTuple(offset + 2*wRes + hRes, n);
tcoords->SetTuple2(offset + 2*wRes + hRes, 0.0, 1.0);
// Okay, now fill in the points along the edges
double t;
for (i=1; i < wRes; i++) //x0 -> x1
{
t = static_cast<double>(i)/wRes;
x[0] = x0[0] + t * (x1[0]-x0[0]);
x[1] = x0[1];
x[2] = this->ComputeDepth(1,x[0],x[1],n);
newPts->SetPoint(offset+i,x);
normals->SetTuple(offset+i,n);
tcoords->SetTuple2(offset+i, t,0.0);
}
for (i=1; i < hRes; i++) //x1 -> x2
{
t = static_cast<double>(i)/hRes;
x[0] = x1[0];
x[1] = x1[1] + t * (x2[1]-x1[1]);
x[2] = this->ComputeDepth(1,x[0],x[1],n);
newPts->SetPoint(offset+wRes+i,x);
normals->SetTuple(offset+wRes+i,n);
tcoords->SetTuple2(offset+wRes+i, 1.0,t);
}
for (i=1; i < wRes; i++) //x2 -> x3
{
t = static_cast<double>(i)/wRes;
x[0] = x2[0] + t * (x3[0]-x2[0]);
x[1] = x2[1];
x[2] = this->ComputeDepth(1,x[0],x[1],n);
newPts->SetPoint(offset+wRes+hRes+i,x);
normals->SetTuple(offset+wRes+hRes+i,n);
tcoords->SetTuple2(offset+wRes+hRes+i, (1.0-t),1.0);
}
for (i=1; i < hRes; i++) //x3 -> x0
{
t = static_cast<double>(i)/hRes;
x[0] = x3[0];
x[1] = x3[1] + t * (x0[1]-x3[1]);
x[2] = this->ComputeDepth(1,x[0],x[1],n);
newPts->SetPoint(offset+2*wRes+hRes+i,x);
normals->SetTuple(offset+2*wRes+hRes+i,n);
tcoords->SetTuple2(offset+2*wRes+hRes+i, 0.0,(1.0-t));
}
// Fill in the inside of the texture region
vtkIdType pts[3];
pts[0] = 0;
for (i=0; i<(this->CircumferentialResolution-1); i++)
{
pts[1] = i + 1;
pts[2] = i + 2;
newPolys->InsertNextCell(3,pts);
}
pts[1] = this->CircumferentialResolution;
pts[2] = 1;
newPolys->InsertNextCell(3,pts);
if ( this->TextureResolution >= 1 )
{
this->InterpolateCurve(1, newPts, this->CircumferentialResolution,
normals, tcoords, this->TextureResolution,
0, 0, offset, 1, 1, 1);
this->CreatePolygons(newPolys, this->CircumferentialResolution,
this->TextureResolution-1, 1);
}
// Create the shoulder region. --------------------------------------------
// Start by duplicating points around the texture region. These are
// copied to avoid texture interpolation pollution.
int c1Start = offset + this->CircumferentialResolution;
for ( i=0; i < this->CircumferentialResolution; i++)
{
newPts->SetPoint(c1Start+i, newPts->GetPoint(offset+i));
normals->SetTuple(c1Start+i, normals->GetTuple(offset+i));
tcoords->SetTuple(c1Start+i, this->ShoulderTextureCoordinate);
}
// Now create points around the perimeter of the button. The locations
// of the points (i.e., angles) are taken from the texture region.
int c2Start = offset + (this->ShoulderResolution+1) *
this->CircumferentialResolution;
for ( i=0; i < this->CircumferentialResolution; i++)
{
//compute the angle
newPts->GetPoint(offset+i, xP);
dX = xP[0] - this->Center[0];
dY = xP[1] - this->Center[1];
this->IntersectEllipseWithLine(this->A2,this->B2,dX,dY,xe,ye);
x[0] = this->Center[0] + xe;
x[1] = this->Center[1] + ye;
x[2] = this->ComputeDepth(0,x[0],x[1],n);
newPts->SetPoint(c2Start+i, x);
normals->SetTuple(c2Start+i, n);
tcoords->SetTuple(c2Start+i, this->ShoulderTextureCoordinate);
}
// Interpolate points between the curves. Create polygons.
this->InterpolateCurve(0, newPts, this->CircumferentialResolution,
normals, tcoords, this->ShoulderResolution,
c1Start, 1, c2Start, 1,
c1Start+this->CircumferentialResolution, 1);
this->CreatePolygons(newPolys, this->CircumferentialResolution,
this->ShoulderResolution, c1Start);
// Create the other side of the button if requested.
if ( this->TwoSided > 0.0 )
{
//do the points
numPts /= 2;
for (i=0; i<numPts; i++)
{
newPts->GetPoint(i, x);
x[0] = -(x[0]-this->Center[0]) + this->Center[0];
x[2] = -(x[2]-this->Center[2]) + this->Center[2];
newPts->SetPoint(i+numPts, x);
normals->GetTuple(i, x);
x[0] = -x[0];
x[2] = -x[2];
normals->SetTuple(i+numPts, x);
tcoords->SetTuple(i+numPts, tcoords->GetTuple(i));
}
//do the polygons
vtkIdType *ipts = 0;
vtkIdType opts[4];
vtkIdType npts = 0;
vtkIdType numPolys=newPolys->GetNumberOfCells();
for ( j=0, newPolys->InitTraversal(); j < numPolys; j++ )
{
newPolys->GetNextCell(npts,ipts);
for (i=0; i<npts; i++)
{
opts[i] = ipts[i] + numPts;
}
newPolys->InsertNextCell(npts,opts);
}
}
// Clean up and get out
output->SetPoints(newPts);
output->GetPointData()->SetNormals(normals);
output->GetPointData()->SetTCoords(tcoords);
output->SetPolys(newPolys);
newPts->Delete();
tcoords->Delete();
normals->Delete();
newPolys->Delete();
return 1;
}
//----------------------------------------------------------------------------
void vtkEllipticalButtonSource::InterpolateCurve(int inTextureRegion,
vtkPoints *newPts, int numPts,
vtkFloatArray *normals,
vtkFloatArray *tcoords, int res,
int c1StartPt, int c1Incr,
int c2StartPt, int c2Incr,
int startPt, int incr)
{
int i, j, idx;
double x0[3], x1[3], tc0[3], tc1[3], t, x[3], tc[2], n[3];
//walk around the curves interpolating new points between them
for ( i=0; i < numPts;
i++, c1StartPt+=c1Incr, c2StartPt+=c2Incr, startPt+=incr)
{
newPts->GetPoint(c1StartPt, x0);
newPts->GetPoint(c2StartPt, x1);
tcoords->GetTuple(c1StartPt, tc0);
tcoords->GetTuple(c2StartPt, tc1);
//do the interpolations along this radius
for ( j=1; j < res; j++ )
{
idx = startPt+(j-1)*numPts;
t = static_cast<double>(j) / res;
x[0] = x0[0] + t * (x1[0] - x0[0]);
x[1] = x0[1] + t * (x1[1] - x0[1]);
x[2] = this->ComputeDepth(inTextureRegion,x[0],x[1],n);
newPts->SetPoint(idx, x);
normals->SetTuple(idx, n);
tc[0] = tc0[0] + t * (tc1[0] - tc0[0]);
tc[1] = tc0[1] + t * (tc1[1] - tc0[1]);
tcoords->SetTuple(idx, tc);
}
}//for all points
}
//----------------------------------------------------------------------------
void vtkEllipticalButtonSource::CreatePolygons(vtkCellArray *newPolys,
int num, int res, int startIdx)
{
int i, j;
vtkIdType idx, pts[4];
for (i=0; i < res; i++, startIdx+=num)
{
idx = startIdx;
for (j=0; j < num; j++, idx++)
{
pts[0] = idx;
pts[1] = idx + num;
if ( j == (num-1) )
{
pts[2] = startIdx + num;
pts[3] = startIdx;
}
else
{
pts[2] = idx + num + 1;
pts[3] = idx + 1;
}
newPolys->InsertNextCell(4,pts);
}
}
}
//----------------------------------------------------------------------------
void vtkEllipticalButtonSource::IntersectEllipseWithLine(double a2, double b2, double dX,
double dY, double& xe, double& ye)
{
double m;
if ( fabs(dY) <= fabs(dX) )
{
m = dY/dX;
xe = sqrt( a2*b2/(b2 + m*m*a2) );
if ( dX < 0.0 ) xe = -xe;
ye = m*xe;
}
else
{
m = dX/dY;
ye = sqrt( a2*b2/(m*m*b2 + a2) );
if ( dY < 0.0 ) ye = -ye;
xe = m*ye;
}
}
//----------------------------------------------------------------------------
double vtkEllipticalButtonSource::ComputeDepth(int vtkNotUsed(inTextureRegion),
double x, double y, double n[3])
{
double z;
x -= this->Center[0];
y -= this->Center[1];
z = 1.0 - (x*x)/this->A2 - (y*y)/this->B2;
if ( z < 0.0 ) n[2] = z = 0.0;
else n[2] = z = this->Depth * sqrt(z);
n[0] = 2.0*x / this->A2;
n[1] = 2.0*y / this->B2;
n[2] = 2.0*z / this->C2;
vtkMath::Normalize(n);
return (z + this->Center[2]);
}
//----------------------------------------------------------------------------
void vtkEllipticalButtonSource::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Width: " << this->Width << "\n";
os << indent << "Height: " << this->Height << "\n";
os << indent << "Depth: " << this->Depth << "\n";
os << indent << "Circumferential Resolution: "
<< this->CircumferentialResolution << "\n";
os << indent << "Texture Resolution: " << this->TextureResolution << "\n";
os << indent << "Shoulder Resolution: " << this->ShoulderResolution << "\n";
os << indent << "Radial Ratio: " << this->RadialRatio << "\n";
os << indent << "Output Points Precision: " << this->OutputPointsPrecision
<< "\n";
}