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Add tests for geoVecNormalize, geoVecNormalizedDot, geoVecProject

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Bryan Housel
2019-03-01 14:09:33 -05:00
parent cb51c16c8f
commit dd234df05b
1 changed files with 74 additions and 0 deletions
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74
test/spec/geo/vector.js
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@@ -76,6 +76,17 @@ describe('iD.geo - vector', function() {
});
});
describe('geoVecNormalize', function() {
it('gets unit vectors', function() {
expect(iD.geoVecNormalize([0, 0])).to.eql([0, 0]);
expect(iD.geoVecNormalize([1, 0])).to.eql([1, 0]);
expect(iD.geoVecNormalize([5, 0])).to.eql([1, 0]);
expect(iD.geoVecNormalize([-5, 0])).to.eql([-1, 0]);
expect(iD.geoVecNormalize([1, 1])[0]).to.be.closeTo(Math.sqrt(2)/2, 1e-6);
expect(iD.geoVecNormalize([1, 1])[1]).to.be.closeTo(Math.sqrt(2)/2, 1e-6);
});
});
describe('geoVecAngle', function() {
it('returns angle between a and b', function() {
expect(iD.geoVecAngle([0, 0], [1, 0])).to.be.closeTo(0, 1e-6);
@@ -98,6 +109,24 @@ describe('iD.geo - vector', function() {
});
});
describe('geoVecNormalizedDot', function() {
it('normalized dot product of right angle is zero', function() {
var a = [2, 0];
var b = [0, 2];
expect(iD.geoVecNormalizedDot(a, b)).to.eql(0);
});
it('normalized dot product of same vector multiplies unit vectors', function() {
var a = [2, 0];
var b = [2, 0];
expect(iD.geoVecNormalizedDot(a, b)).to.eql(1);
});
it('normalized dot product of 45 degrees', function() {
var a = [0, 2];
var b = [2, 2];
expect(iD.geoVecNormalizedDot(a, b)).to.be.closeTo(Math.sqrt(2)/2, 1e-6);
});
});
describe('geoVecCross', function() {
it('2D cross product of right hand turn is positive', function() {
var a = [2, 0];
@@ -116,4 +145,49 @@ describe('iD.geo - vector', function() {
});
});
describe('geoVecProject', function() {
it('returns null for a degenerate path (no nodes)', function() {
expect(iD.geoVecProject([0, 1], [])).to.be.null;
});
it('returns null for a degenerate path (single node)', function() {
expect(iD.geoVecProject([0, 1], [0, 0])).to.be.null;
});
it('calculates the orthogonal projection of a point onto a path', function() {
// c
// |
// a --*--- b
//
// * = [2, 0]
var a = [0, 0];
var b = [5, 0];
var c = [2, 1];
var choice = iD.geoVecProject(c, [a, b]);
expect(choice.index).to.eql(1);
expect(choice.distance).to.eql(1);
expect(choice.target).to.eql([2, 0]);
});
it('returns the starting vertex when the orthogonal projection is < 0', function() {
var a = [0, 0];
var b = [5, 0];
var c = [-3, 4];
var choice = iD.geoVecProject(c, [a, b]);
expect(choice.index).to.eql(1);
expect(choice.distance).to.eql(5);
expect(choice.target).to.eql([0, 0]);
});
it('returns the ending vertex when the orthogonal projection is > 1', function() {
var a = [0, 0];
var b = [5, 0];
var c = [8, 4];
var choice = iD.geoVecProject(c, [a, b]);
expect(choice.index).to.eql(1);
expect(choice.distance).to.eql(5);
expect(choice.target).to.eql([5, 0]);
});
});
});