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///////////////////////////////////////////////////////////////////////
// Class Utils
// Vector Utility functions
///////////////////////////////////////////////////////////////////////
var VecUtils = exports.VecUtils = Object.create(Object.prototype,
{
///////////////////////////////////////////////////////////////////////
// Instance variables
///////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////
// Property accessors
///////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////
// Vector Methods
///////////////////////////////////////////////////////////////////////
vecNormalize: {
value: function(dimen, vec, lenToMake) {
var rtnVec;
try
{
var len = 1.0
var nArgs = arguments.length;
if (nArgs > 2)
len = lenToMake;
var sum = 0.0;
for (var i=0; i<dimen; i++)
sum += vec[i]*vec[i];
sum = Math.sqrt( sum );
if (MathUtils.fpSign(sum) != 0)
{
var scale = len/sum;
rtnVec = [0];
for (var i=0; i<dimen; i++)
rtnVec[i] = vec[i]*scale;
}
else
{
rtnVec = [0];
for (var i=1; i<dimen; i++)
rtnVec[i] = 0;
}
}
catch(e)
{
throw new Error( "exception in vecNormalize: " + e);
}
return rtnVec;
}
},
vecAdd: {
value: function( dimen, a, b ) {
var rtnVec;
if ((a.length < dimen) || (b.length < dimen))
{
throw new Error( "dimension error in VecUtils.vecAdd" );
}
rtnVec = [0];
for (var i=0; i<dimen; i++)
rtnVec[i] = a[i] + b[i];
return rtnVec;
}
},
vecSubtract : {
value: function( dimen, a, b ) {
var rtnVec;
if ((a.length < dimen) || (b.length < dimen))
{
throw new Error( "dimension error in VecUtils.vecSubtract" );
}
rtnVec = [0];
for (var i=0; i<dimen; i++)
rtnVec[i] = a[i] - b[i];
return rtnVec;
}
},
vecDist : {
value: function( dimen, a, b ) {
var sum;
if ((a.length < dimen) || (b.length < dimen))
{
throw new Error( "dimension error in VecUtils.vecSubtract" );
}
var sum = 0.0;
for (var i=0; i<dimen; i++)
{
var d = a[i] - b[i];
sum += d*d;
}
sum = Math.sqrt( sum );
return sum;
}
},
vecDistSq : {
value: function( dimen, a, b ) {
var sum;
if ((a.length < dimen) || (b.length < dimen))
{
throw new Error( "dimension error in VecUtils.vecDistSq" );
}
var sum = 0.0;
for (var i=0; i<dimen; i++)
{
var d = a[i] - b[i];
sum += d*d;
}
return sum;
}
},
vecDot : {
value: function( dimen, v0, v1 ) {
if ((v0.length < dimen) || (v1.length < dimen))
{
throw new Error( "dimension error in VecUtils.vecDot" );
}
var sum = 0.0;
for (var i=0; i<dimen; i++)
sum += v0[i] * v1[i];
return sum;
}
},
vecCross: {
value: function( dimen, v0, v1 ) {
if ((v0.length < dimen) || (v1.length < dimen))
{
throw new Error( "dimension error in VecUtils.vecCross" );
}
var rtnVal;
if (dimen == 2)
rtnVal = v0[0]*v1[1] - v0[1]*v1[0];
else if (dimen == 3)
{
rtnVal = [ v0[1]*v1[2] - v0[2]*v1[1], -v0[0]*v1[2] + v0[2]*v1[0], v0[0]*v1[1] - v0[1]*v1[0] ];
}
else
throw new Error( "VecUtils.vecCross supports only 2 or 3 dimensional vectors: " + dimen );
return rtnVal;
}
},
vecInterpolate: {
value: function( dimen, a, b, t ) {
if ((a.length < dimen) || (b.length < dimen))
{
throw new Error( "dimension error in VecUtils.vecSubtract" );
}
var rtnVec = [0];
for (var i=0; i<dimen; i++)
rtnVec[i] = a[i] + t*(b[i] - a[i]);
return rtnVec;
}
},
vecMag: {
value: function( dimen, vec ) {
var sum = 0.0;
for (var i=0; i<dimen; i++)
sum += vec[i]*vec[i];
return Math.sqrt( sum );
}
},
vecNegate: {
value: function( dimen, v ) {
for (var i=0; i<dimen; i++)
v[i] = -v[i];
return v;
}
},
vecScale: {
value: function(dimen, vec, scale) {
for (var i=0; i<dimen; i++)
vec[i] *= scale;
return vec;
}
},
matI :
{
value: function(dimen)
{
var mat = [];
for (var i=0; i<dimen*dimen; i++) mat.push(0);
var index = 0;
for (var i=0; i<dimen; i++)
{
mat[index] = 1.0;
index += dimen + 1;
}
return mat;
}
},
matTranslation:
{
value: function (vec)
{
var mat = Matrix.I(4);
glmat4.translate(mat, vec);
return mat;
}
},
matRotationX:
{
value: function( angle )
{
var mat = Matrix.I(4);
glmat4.rotateX(mat, angle);
return mat;
}
},
matRotationY:
{
value: function( angle )
{
var mat = Matrix.I(4);
glmat4.rotateY(mat, angle);
return mat;
}
},
matRotationZ:
{
value: function( angle )
{
var mat = Matrix.I(4);
glmat4.rotateZ(mat, angle);
return mat;
}
},
matRotation:
{
value: function(angle, axis)
{
var mat = Matrix.I(4);
glmat4.rotate(mat, angle, axis);
return mat;
}
}
});