Sha256: 5671107f47e2a423bd150c0101c7464e7656ddf8002e999621dac6c01e2e2f36
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Size: 990 Bytes
Versions: 5
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Stored size: 990 Bytes
Contents
// Adds floating point numbers with twice the normal precision.
// Reference: J. R. Shewchuk, Adaptive Precision Floating-Point Arithmetic and
// Fast Robust Geometric Predicates, Discrete & Computational Geometry 18(3)
// 305–363 (1997).
// Code adapted from GeographicLib by Charles F. F. Karney,
// http://geographiclib.sourceforge.net/
// See lib/geographiclib/LICENSE for details.
function d3_adder() {}
d3_adder.prototype = {
s: 0, // rounded value
t: 0, // exact error
add: function(y) {
d3_adderSum(y, this.t, d3_adderTemp);
d3_adderSum(d3_adderTemp.s, this.s, this);
if (this.s) this.t += d3_adderTemp.t;
else this.s = d3_adderTemp.t;
},
reset: function() {
this.s = this.t = 0;
},
valueOf: function() {
return this.s;
}
};
var d3_adderTemp = new d3_adder;
function d3_adderSum(a, b, o) {
var x = o.s = a + b, // a + b
bv = x - a, av = x - bv; // b_virtual & a_virtual
o.t = (a - av) + (b - bv); // a_roundoff + b_roundoff
}
Version data entries
5 entries across 5 versions & 3 rubygems