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/*
* Modification History
*
* 2004-August-9 Jason Rohrer
* Created.
*/
#include "ParameterizedSpace.h"
#include <math.h>
ParameterizedSpace::~ParameterizedSpace() {
for( int i=0; i<mNumControlPoints; i++ ) {
delete mControlPoints[i];
}
delete [] mControlPoints;
delete [] mControlPointParameterAnchors;
}
ParameterSpaceControlPoint *ParameterizedSpace::getBlendedControlPoint(
double inParameter ) {
if( mNumControlPoints >= 2 ) {
// find the 2 surrounding control points
// all distances will be no more than 1
double distanceFromClosestLargerPoint = 2;
double distanceFromClosestSmallerPoint = 3;
int indexOfClosestLargerPoint = -1;
int indexOfClosestSmallerPoint = -1;
for( int i=0; i<mNumControlPoints; i++ ) {
double distanceFromThisPoint =
fabs( mControlPointParameterAnchors[i] - inParameter );
if( mControlPointParameterAnchors[i] >= inParameter ) {
// a larger point
if( distanceFromThisPoint < distanceFromClosestLargerPoint ) {
// closer than our closest largerpoint
indexOfClosestLargerPoint = i;
distanceFromClosestLargerPoint = distanceFromThisPoint;
}
}
else {
// a smaller point
if( distanceFromThisPoint < distanceFromClosestSmallerPoint ) {
// closer than our closest smallerpoint
indexOfClosestSmallerPoint = i;
distanceFromClosestSmallerPoint = distanceFromThisPoint;
}
}
}
if( indexOfClosestLargerPoint != -1 &&
indexOfClosestSmallerPoint != -1 ) {
// found two points
// compute weights
double distanceBetweenSurroundingPoints =
fabs( mControlPointParameterAnchors[
indexOfClosestLargerPoint ] -
mControlPointParameterAnchors[
indexOfClosestSmallerPoint ] );
double weightOnLargerPoint =
distanceFromClosestSmallerPoint /
distanceBetweenSurroundingPoints;
// blend the two points, using the distance to weight them
return
mControlPoints[ indexOfClosestSmallerPoint ]->
createLinearBlend(
mControlPoints[ indexOfClosestLargerPoint ],
weightOnLargerPoint );
}
else {
// found only one point
int indexOfPoint;
if( indexOfClosestLargerPoint != -1 ) {
indexOfPoint = indexOfClosestLargerPoint;
}
else if( indexOfClosestLargerPoint != -1 ) {
indexOfPoint = indexOfClosestSmallerPoint;
}
else {
printf( "Error: found no closest space parameter map "
" anchor point.\n" );
indexOfPoint = 0;
}
// return copy of this point
return mControlPoints[ indexOfPoint ]->copy();
}
}
else if( mNumControlPoints == 1 ) {
// only one anchor point... return its parameters
return mControlPoints[0]->copy();
}
else {
printf( "Error: no anchor points in sculpture parameter space.\n" );
return NULL;
}
/*
if( mNumControlPoints >= 2 ) {
// find the 2 closest control points
// all distances will be no more than 1
double distanceFromClosestPoint = 2;
double distanceFromNextClosestPoint = 3;
int indexOfClosestPoint = -1;
int indexOfNextClosestPoint = -1;
for( int i=0; i<mNumControlPoints; i++ ) {
double distanceFromThisPoint =
fabs( mControlPointParameterAnchors[i] - inParameter );
if( distanceFromThisPoint < distanceFromClosestPoint ) {
// closer than our closest point
indexOfNextClosestPoint = indexOfClosestPoint;
distanceFromNextClosestPoint = distanceFromClosestPoint;
indexOfClosestPoint = i;
distanceFromClosestPoint = distanceFromThisPoint;
}
else if( distanceFromThisPoint < distanceFromNextClosestPoint ) {
// not as close as our closest point, but closer than
// our next closest point
indexOfNextClosestPoint = i;
distanceFromNextClosestPoint = distanceFromThisPoint;
}
}
// scale the distance from our parameter to the closest point
// by the distance between the two closest points to get a weight
// for the closest point
double distanceBetweenClosestPoints =
fabs( mControlPointParameterAnchors[ indexOfClosestPoint ] -
mControlPointParameterAnchors[ indexOfNextClosestPoint ] );
double weightOnClosestPoint =
1 - ( distanceFromClosestPoint / distanceBetweenClosestPoints );
// blend the two points, using the distance to weight them
return
mControlPoints[ indexOfNextClosestPoint ]->createLinearBlend(
mControlPoints[ indexOfClosestPoint ],
weightOnClosestPoint );
}
else if( mNumControlPoints == 1 ) {
// only one control point... return a copy
return mControlPoints[0]->copy();
}
else {
printf( "Error: no control points in space space.\n" );
return NULL;
}
*/
}
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