mth/ebiten
1
0
Fork 0
mirror of https://github.com/hajimehoshi/ebiten.git synced 2024-12-25 03:08:54 +01:00
Code Issues Packages Projects Releases Wiki Activity

vector/internal/math: Remove Vector

Browse Source
This commit is contained in:
Hajime Hoshi 2019-12-29 23:04:32 +09:00
parent 17e16e5759
commit 17dc972b7a
2 changed files with 6 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
vector/internal/math/math.go
View File

@ -24,8 +24,3 @@ type Point struct {
X float32 X float32
Y float32 Y float32
} }
type Vector struct {
X float32
Y float32
}

12
vector/internal/math/triangulate.go
View File

@ -18,12 +18,12 @@ import (
"fmt" "fmt"
) )
func cross(v0, v1 Vector) float32 { func cross(v0x, v0y, v1x, v1y float32) float32 {
return v0.X*v1.Y - v0.Y*v1.X return v0x*v1y - v0y*v1x
} }
func triangleCross(pt0, pt1, pt2 Point) float32 { func triangleCross(pt0, pt1, pt2 Point) float32 {
return cross(Vector{pt1.X - pt0.X, pt1.Y - pt0.Y}, Vector{pt2.X - pt1.X, pt2.Y - pt1.Y}) return cross(pt1.X-pt0.X, pt1.Y-pt0.Y, pt2.X-pt1.X, pt2.Y-pt1.Y)
} }
func adjacentIndices(indices []uint16, idx int) (uint16, uint16, uint16) { func adjacentIndices(indices []uint16, idx int) (uint16, uint16, uint16) {
@ -43,9 +43,9 @@ func InTriangle(pt, pt0, pt1, pt2 Point) bool {
if pt.Y >= pt0.Y && pt.Y >= pt1.Y && pt.Y >= pt2.Y { if pt.Y >= pt0.Y && pt.Y >= pt1.Y && pt.Y >= pt2.Y {
return false return false
} }
c0 := cross(Vector{pt.X - pt0.X, pt.Y - pt0.Y}, Vector{pt1.X - pt0.X, pt1.Y - pt0.Y}) c0 := cross(pt.X-pt0.X, pt.Y-pt0.Y, pt1.X-pt0.X, pt1.Y-pt0.Y)
c1 := cross(Vector{pt.X - pt1.X, pt.Y - pt1.Y}, Vector{pt2.X - pt1.X, pt2.Y - pt1.Y}) c1 := cross(pt.X-pt1.X, pt.Y-pt1.Y, pt2.X-pt1.X, pt2.Y-pt1.Y)
c2 := cross(Vector{pt.X - pt2.X, pt.Y - pt2.Y}, Vector{pt0.X - pt2.X, pt0.Y - pt2.Y}) c2 := cross(pt.X-pt2.X, pt.Y-pt2.Y, pt0.X-pt2.X, pt0.Y-pt2.Y)
return (c0 <= 0 && c1 <= 0 && c2 <= 0) || (c0 >= 0 && c1 >= 0 && c2 >= 0) return (c0 <= 0 && c1 <= 0 && c2 <= 0) || (c0 >= 0 && c1 >= 0 && c2 >= 0)
} }