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tweaks

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This commit is contained in:
Josh Deprez 2021-09-04 12:51:51 +10:00
parent 2e2bf97cd9
commit a4a5be2d37
2 changed files with 21 additions and 13 deletions
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19
engine/actor.go
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@ -33,8 +33,8 @@ func (a *Actor) CollidesAt(p Point3) bool {
return false return false
} }
func (a *Actor) MoveX(dx float64, onCollide func()) { func (a *Actor) MoveX(x float64, onCollide func()) {
a.xRem += dx a.xRem += x
move := int(a.xRem + 0.5) // Note: math.Round can lead to vibration move := int(a.xRem + 0.5) // Note: math.Round can lead to vibration
if move == 0 { if move == 0 {
return return
@ -53,8 +53,8 @@ func (a *Actor) MoveX(dx float64, onCollide func()) {
} }
} }
func (a *Actor) MoveY(dy float64, onCollide func()) { func (a *Actor) MoveY(y float64, onCollide func()) {
a.yRem += dy a.yRem += y
move := int(a.yRem + 0.5) move := int(a.yRem + 0.5)
if move == 0 { if move == 0 {
return return
@ -73,8 +73,8 @@ func (a *Actor) MoveY(dy float64, onCollide func()) {
} }
} }
func (a *Actor) MoveZ(dz float64, onCollide func()) { func (a *Actor) MoveZ(z float64, onCollide func()) {
a.zRem += dz a.zRem += z
move := int(a.zRem + 0.5) move := int(a.zRem + 0.5)
if move == 0 { if move == 0 {
return return
@ -97,10 +97,3 @@ func (a *Actor) Prepare(g *Game) error {
a.game = g a.game = g
return nil return nil
} }
func sign(m int) int {
if m < 0 {
return -1
}
return 1
}

15
engine/point.go
View file

@ -65,6 +65,21 @@ func (p Point3) Coord() (x, y, z int) {
return p.X, p.Y, p.Z return p.X, p.Y, p.Z
} }
// Sign returns a sign vector.
func (p Point3) Sign() Point3 {
return Point3{sign(p.X), sign(p.Y), sign(p.Z)}
}
func sign(m int) int {
if m == 0 {
return 0
}
if m < 0 {
return -1
}
return 1
}
// IsoProject performs isometric projection of a 3D coordinate into 2D. // IsoProject performs isometric projection of a 3D coordinate into 2D.
// //
// If π.X = 0, the x returned is p.X; similarly for π.Y and y. // If π.X = 0, the x returned is p.X; similarly for π.Y and y.