Sha256: 932b032a0ff30059d8a39856fd4d1fecbf4a01218fb10ca610534f28174f14da
Contents?: true
Size: 1.92 KB
Versions: 5
Compression:
Stored size: 1.92 KB
Contents
Jax.Geometry.Plane = (function() {
function innerProduct(a, x, y, z) {
return (a[0]*x + a[1]*y + a[2]*z);
}
return Jax.Class.create({
initialize: function(points) {
if (points) this.set.apply(this, arguments);
},
set: function(points) {
if (arguments.length == 3) points = [arguments[0], arguments[1], arguments[2]];
this.normal = vec3.create();
var vec = vec3.create();
vec3.subtract(points[1], points[0], this.normal);
vec3.subtract(points[2], points[0], vec);
vec3.cross(this.normal, vec, this.normal);
vec3.normalize(this.normal);
// vec3.subtract(points[1], points[0], this.normal);
// vec3.cross(this.normal, vec3.subtract(points[2], points[0], vec3.create()));
// vec3.normalize(this.normal);
// this.normal = (points[1].minus(points[0])).cross(points[2].minus(points[0])).normalize();
this.point = points[1];
this.d = -innerProduct(this.normal, this.point[0], this.point[1], this.point[2]);
},
setCoefficients: function(a, b, c, d) {
var len = Math.sqrt(a*a+b*b+c*c);
this.normal[0] = a/len;
this.normal[1] = b/len;
this.normal[2] = c/len;
this.d = d/len;
},
distance: function(point)
{
var x, y, z;
if (arguments.length == 3) { x = arguments[0]; y = arguments[1]; z = arguments[2]; }
else { x = point[0]; y = point[1]; z = point[2]; }
// same as ax + by + cz + d
return this.d + innerProduct(this.normal, x, y, z);
},
whereis: function(point)
{
if (arguments.length == 3) points = [arguments[0], arguments[1], arguments[2]];
var d = this.distance(point);
if (d > 0) return Jax.Geometry.Plane.FRONT;
if (d < 0) return Jax.Geometry.Plane.BACK;
return Jax.Geometry.Plane.INTERSECT;
}
});
})();
Jax.Geometry.Plane.FRONT = 1;
Jax.Geometry.Plane.BACK = 2;
Jax.Geometry.Plane.INTERSECT = 3;
Version data entries
5 entries across 5 versions & 1 rubygems