blob: 359b21bd749f4175648082b4eca78056d39db70d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
package moe.nea.firmament.util.math
import kotlin.math.absoluteValue
import kotlin.math.cos
import kotlin.math.sin
import net.minecraft.util.math.Vec2f
import moe.nea.firmament.util.render.wrapAngle
object Projections {
object Two {
val ε = 1e-6
val π = moe.nea.firmament.util.render.π
val τ = 2 * π
fun isNullish(float: Float) = float.absoluteValue < ε
fun xInterceptOfLine(origin: Vec2f, direction: Vec2f): Vec2f? {
if (isNullish(direction.x))
return Vec2f(origin.x, 0F)
if (isNullish(direction.y))
return null
val slope = direction.y / direction.x
return Vec2f(origin.x - origin.y / slope, 0F)
}
fun interceptAlongCardinal(distanceFromAxis: Float, slope: Float): Float? {
if (isNullish(slope))
return null
return -distanceFromAxis / slope
}
fun projectAngleOntoUnitBox(angleRadians: Double): Vec2f {
val angleRadians = wrapAngle(angleRadians)
val cx = cos(angleRadians)
val cy = sin(angleRadians)
val ex = 1 / cx.absoluteValue
val ey = 1 / cy.absoluteValue
val e = minOf(ex, ey)
return Vec2f((cx * e).toFloat(), (cy * e).toFloat())
}
}
}
|
