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Implement Path.RegularPolygon constructor and add tests for it.

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This commit is contained in:
Jonathan Puckey 2011-02-26 19:19:02 +01:00
parent f9ccd1d1a5
commit eebe7e2731
2 changed files with 24 additions and 0 deletions
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13
src/path/Path.Constructors.js
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@ -102,6 +102,19 @@ Path.inject({ statics: new function() {
path.moveTo(from); path.moveTo(from);
path.arcTo(through, to); path.arcTo(through, to);
return path; return path;
},
RegularPolygon: function(center, numSides, radius) {
center = new Point(center);
var path = new Path();
var three = !(numSides % 3);
var vector = new Point(0, three ? -radius : radius);
for(var i = 0; i < numSides; i++) {
var angle = (360 / numSides) * (i + (three ? -1 : 0.5));
path.add(center.add(vector.rotate(angle)));
}
path.closed = true;
return path;
} }
}; };
}}); }});

11
test/tests/Path_Shapes.js
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@ -38,3 +38,14 @@ test('new Path.Arc(from, through, to)', function() {
var expectedSegments = [{ point: { x: 50, y: 50 }, handleOut: { x: 10.11156, y: -10.11156 } }, { point: { x: 88.5299, y: 42.33593 }, handleIn: { x: -13.21138, y: -5.47233 }, handleOut: { x: 13.21138, y: 5.47233 } }, { point: { x: 110.35534, y: 75 }, handleIn: { x: 0, y: -14.2999 } }]; var expectedSegments = [{ point: { x: 50, y: 50 }, handleOut: { x: 10.11156, y: -10.11156 } }, { point: { x: 88.5299, y: 42.33593 }, handleIn: { x: -13.21138, y: -5.47233 }, handleOut: { x: 13.21138, y: 5.47233 } }, { point: { x: 110.35534, y: 75 }, handleIn: { x: 0, y: -14.2999 } }];
compareSegmentLists(path.segments, expectedSegments); compareSegmentLists(path.segments, expectedSegments);
}); });
test('new Path.RegularPolygon(center, numSides, radius)', function() {
var doc = new Doc();
var path = new Path.RegularPolygon(new Point(50, 50), 3, 10);
var expectedSegments = [{ point: { x: 41.33984, y: 55 } }, { point: { x: 50, y: 40 } }, { point: { x: 58.66016, y: 55 } }];
compareSegmentLists(path.segments, expectedSegments);
var path = new Path.RegularPolygon(new Point(250, 250), 10, 100);
var expectedSegments = [{ point: { x: 219.09814, y: 345.10547 } }, { point: { x: 169.09814, y: 308.77832 } }, { point: { x: 150, y: 250 } }, { point: { x: 169.09814, y: 191.22168 } }, { point: { x: 219.09814, y: 154.89453 } }, { point: { x: 280.90186, y: 154.89453 } }, { point: { x: 330.90186, y: 191.22168 } }, { point: { x: 350, y: 250 } }, { point: { x: 330.90186, y: 308.77832 } }, { point: { x: 280.90186, y: 345.10547 } }];
compareSegmentLists(path.segments, expectedSegments);
});