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add trapezoid()

This commit is contained in:
Octopus Octopus 2022-06-11 12:29:52 -05:00
parent 0cf0235342
commit 8a875a3874
1 changed files with 23 additions and 0 deletions
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23
fightstick/misc.go
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@ -4,6 +4,7 @@ import (
"log" "log"
"github.com/deadsy/sdfx/sdf" "github.com/deadsy/sdfx/sdf"
v2 "github.com/deadsy/sdfx/vec/v2"
) )
func loggedMovement(input sdf.SDF2, displacement sdf.V2, label string) sdf.SDF2 { func loggedMovement(input sdf.SDF2, displacement sdf.V2, label string) sdf.SDF2 {
@ -23,3 +24,25 @@ func splitPlane() map[string]sdf.SDF2 {
planes["right"] = sdf.Difference2D(original, cORight) planes["right"] = sdf.Difference2D(original, cORight)
return planes return planes
} }
// trapezoid creates a trapezoid from a vector, base is a v2.Vector, xChange modifies the top half.
// positive xChange values make the top half larger, negative xChange values make the top half smaller.
func trapezoid(base v2.Vec, xChange float64) sdf.SDF2 {
dimensions := v2.VecSet{
v2.Vec{X: 0, Y: 0},
v2.Vec{X: -xChange, Y: base.Y},
v2.Vec{X: base.X + xChange, Y: base.Y},
v2.Vec{X: base.X, Y: 0},
v2.Vec{X: 0, Y: 0},
}
trapezoid, err := sdf.Polygon2D(dimensions)
if err != nil {
log.Printf("error: %v\nReturning unmodified base.\n", err)
return sdf.Box2D(base, 0)
}
trapezoid = sdf.Center2D(trapezoid)
return trapezoid
}