69 lines
1.7 KiB
Go
Executable File
69 lines
1.7 KiB
Go
Executable File
// CookieJar - A contestant's algorithm toolbox
|
|
// Copyright (c) 2013 Peter Szilagyi. All rights reserved.
|
|
//
|
|
// CookieJar is dual licensed: use of this source code is governed by a BSD
|
|
// license that can be found in the LICENSE file. Alternatively, the CookieJar
|
|
// toolbox may be used in accordance with the terms and conditions contained
|
|
// in a signed written agreement between you and the author(s).
|
|
|
|
package geometry
|
|
|
|
import (
|
|
"math"
|
|
)
|
|
|
|
// Two dimensional point.
|
|
type Point2 struct {
|
|
X, Y float64
|
|
}
|
|
|
|
// Three dimensional point.
|
|
type Point3 struct {
|
|
X, Y, Z float64
|
|
}
|
|
|
|
// Allocates and returns a new 2D point.
|
|
func NewPoint2(x, y float64) *Point2 {
|
|
return &Point2{x, y}
|
|
}
|
|
|
|
// Allocates and returns a new 3D point.
|
|
func NewPoint3(x, y, z float64) *Point3 {
|
|
return &Point3{x, y, z}
|
|
}
|
|
|
|
// Calculates the distance between x and y.
|
|
func (x *Point2) Dist(y *Point2) float64 {
|
|
return math.Sqrt(x.DistSqr(y))
|
|
}
|
|
|
|
// Calculates the distance between x and y.
|
|
func (x *Point3) Dist(y *Point3) float64 {
|
|
return math.Sqrt(x.DistSqr(y))
|
|
}
|
|
|
|
// Calculates the squared distance between x and y.
|
|
func (x *Point2) DistSqr(y *Point2) float64 {
|
|
dx := x.X - y.X
|
|
dy := x.Y - y.Y
|
|
return dx*dx + dy*dy
|
|
}
|
|
|
|
// Calculates the squared distance between x and y.
|
|
func (x *Point3) DistSqr(y *Point3) float64 {
|
|
dx := x.X - y.X
|
|
dy := x.Y - y.Y
|
|
dz := x.Z - y.Z
|
|
return dx*dx + dy*dy + dz*dz
|
|
}
|
|
|
|
// Returns whether two points are equal.
|
|
func (x *Point2) Equal(y *Point2) bool {
|
|
return math.Abs(x.X-y.X) < eps && math.Abs(x.Y-y.Y) < eps
|
|
}
|
|
|
|
// Returns whether two points are equal.
|
|
func (x *Point3) Equal(y *Point3) bool {
|
|
return math.Abs(x.X-y.X) < eps && math.Abs(x.Y-y.Y) < eps && math.Abs(x.Z-y.Z) < eps
|
|
}
|