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added Vertices.chamfer (for rounding corners)

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liabru 2014-05-03 16:53:21 +01:00
parent f1db9df854
commit 120157d6fd
2 changed files with 95 additions and 0 deletions
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21
src/factory/Bodies.js
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@ -30,6 +30,13 @@ var Bodies = {};
vertices: Vertices.fromPath('L 0 0 L ' + width + ' 0 L ' + width + ' ' + height + ' L 0 ' + height)
};
if (options.chamfer) {
var chamfer = options.chamfer;
rectangle.vertices = Vertices.chamfer(rectangle.vertices, chamfer.radius,
chamfer.quality, chamfer.qualityMin, chamfer.qualityMax);
delete options.chamfer;
}
return Body.create(Common.extend({}, rectangle, options));
};
@ -60,6 +67,13 @@ var Bodies = {};
vertices: Vertices.fromPath('L 0 0 L ' + x1 + ' ' + (-height) + ' L ' + x2 + ' ' + (-height) + ' L ' + x3 + ' 0')
};
if (options.chamfer) {
var chamfer = options.chamfer;
trapezoid.vertices = Vertices.chamfer(trapezoid.vertices, chamfer.radius,
chamfer.quality, chamfer.qualityMin, chamfer.qualityMax);
delete options.chamfer;
}
return Body.create(Common.extend({}, trapezoid, options));
};
@ -126,6 +140,13 @@ var Bodies = {};
vertices: Vertices.fromPath(path)
};
if (options.chamfer) {
var chamfer = options.chamfer;
polygon.vertices = Vertices.chamfer(polygon.vertices, chamfer.radius,
chamfer.quality, chamfer.qualityMin, chamfer.qualityMax);
delete options.chamfer;
}
return Body.create(Common.extend({}, polygon, options));
};

74
src/geometry/Vertices.js
View file

@ -204,4 +204,78 @@ var Vertices = {};
return vertices;
};
/**
* Chamfers a set of vertices by giving them rounded corners, returns a new set of vertices.
* The radius parameter is a single number or an array to specify the radius for each vertex.
* @method chamfer
* @param {vertices} vertices
* @param {number[]} radius
* @param {number} quality
* @param {number} qualityMin
* @param {number} qualityMax
*/
Vertices.chamfer = function(vertices, radius, quality, qualityMin, qualityMax) {
radius = radius || [8];
if (!radius.length)
radius = [radius];
// quality defaults to -1, which is auto
quality = (typeof quality !== 'undefined') ? quality : -1;
qualityMin = qualityMin || 2;
qualityMax = qualityMax || 14;
var centre = Vertices.centre(vertices),
newVertices = [];
for (var i = 0; i < vertices.length; i++) {
var prevVertex = vertices[i - 1 >= 0 ? i - 1 : vertices.length - 1],
vertex = vertices[i],
nextVertex = vertices[(i + 1) % vertices.length],
currentRadius = radius[i < radius.length ? i : radius.length - 1];
if (currentRadius === 0) {
newVertices.push(vertex);
continue;
}
var prevNormal = Vector.normalise({
x: vertex.y - prevVertex.y,
y: prevVertex.x - vertex.x
});
var nextNormal = Vector.normalise({
x: nextVertex.y - vertex.y,
y: vertex.x - nextVertex.x
});
var diagonalRadius = Math.sqrt(2 * Math.pow(currentRadius, 2)),
radiusVector = Vector.mult(Common.clone(prevNormal), currentRadius),
midNormal = Vector.normalise(Vector.mult(Vector.add(prevNormal, nextNormal), 0.5)),
scaledVertex = Vector.sub(vertex, Vector.mult(midNormal, diagonalRadius));
var precision = quality;
if (quality === -1) {
// automatically decide precision
precision = Math.pow(currentRadius, 0.32) * 1.75;
}
precision = Common.clamp(precision, qualityMin, qualityMax);
// use an even value for precision, more likely to reduce axes by using symmetry
if (precision % 2 === 1)
precision += 1;
var alpha = Math.acos(Vector.dot(prevNormal, nextNormal)),
theta = alpha / precision;
for (var j = 0; j < precision; j++) {
newVertices.push(Vector.add(Vector.rotate(radiusVector, theta * j), scaledVertex));
}
}
return newVertices;
};
})();