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This commit is contained in:
Fraser Graham 2013-08-08 20:36:15 -07:00
parent 62635d35e4
commit bf833807f0
2 changed files with 11 additions and 11 deletions
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10
govector_test.go
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@ -6,19 +6,19 @@ import (
) )
func TestSub(t *testing.T) { func TestSub(t *testing.T) {
p1 := point2d{10, 10} p1 := Point2d{10, 10}
p2 := point2d{5, 5} p2 := Point2d{5, 5}
v := p1.sub(p2) v := p1.sub(p2)
if v != (vector2d{5, 5}) { if v != (Vector2d{5, 5}) {
t.Errorf("Sub Error") t.Errorf("Sub Error")
} }
} }
func TestMag(t *testing.T) { func TestMag(t *testing.T) {
p1 := point2d{10, 10} p1 := Point2d{10, 10}
p2 := point2d{7, 6} p2 := Point2d{7, 6}
v := p1.sub(p2) v := p1.sub(p2)
m := v.mag() m := v.mag()

12
vectorpoint.go
View File

@ -1,26 +1,26 @@
package govector package govector
import ( import (
"math" "math"
) )
type vector2d struct { type Vector2d struct {
X float64 `json:"x"` X float64 `json:"x"`
Y float64 `json:"y"` Y float64 `json:"y"`
} }
type point2d struct { type Point2d struct {
X float64 `json:"x"` X float64 `json:"x"`
Y float64 `json:"y"` Y float64 `json:"y"`
} }
const epsilon = 1e-7 const epsilon = 1e-7
func (p1 point2d) sub(p2 point2d) vector2d { func (p1 Point2d) sub(p2 Point2d) Vector2d {
v := vector2d{p1.X - p2.X, p1.Y - p2.Y} v := Vector2d{p1.X - p2.X, p1.Y - p2.Y}
return v return v
} }
func (v vector2d) mag() float64 { func (v Vector2d) mag() float64 {
return math.Abs(math.Sqrt(v.X*v.X + v.Y*v.Y)) return math.Abs(math.Sqrt(v.X*v.X + v.Y*v.Y))
} }