forked from kscience/kmath
non-existence of tangents throws exception
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ed4aa47913
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cc0fb2a718
@ -38,20 +38,25 @@ public fun Circle2D.tangentsToCircle(
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} else {
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r1.absoluteValue + r2.absoluteValue
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}
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val l = (d * d - r * r).pow(0.5)
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angle2 = if (r1.absoluteValue > r2.absoluteValue) {
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angle1 + r1.sign * atan2(r.absoluteValue, l)
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} else {
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angle1 - r2.sign * atan2(r.absoluteValue, l)
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}
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val w = vector(-cos(angle2), sin(angle2))
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put(
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route,
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LineSegment(
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center + w * r1,
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other.center + w * r2
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if (d * d > r * r) {
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val l = (d * d - r * r).pow(0.5)
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angle2 = if (r1.absoluteValue > r2.absoluteValue) {
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angle1 + r1.sign * atan2(r.absoluteValue, l)
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} else {
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angle1 - r2.sign * atan2(r.absoluteValue, l)
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}
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val w = vector(-cos(angle2), sin(angle2))
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put(
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route,
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LineSegment(
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center + w * r1,
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other.center + w * r2
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)
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)
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)
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}
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else {
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throw Exception("Circles should not be")
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}
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}
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}
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}
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@ -13,6 +13,7 @@ import space.kscience.kmath.geometry.equalsLine
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import kotlin.test.Test
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import kotlin.test.assertEquals
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import kotlin.test.assertTrue
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import kotlin.test.assertFailsWith
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class TangentTest {
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@Test
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@ -53,4 +54,28 @@ class TangentTest {
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assertTrue(segments[i].equalsLine(Euclidean2DSpace, tangentMapValues[i]))
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}
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}
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@Test
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fun nonExistingTangents() {
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assertFailsWith<Exception> {
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val c1 = Circle2D(vector(0.0, 0.0), 10.0)
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val c2 = Circle2D(vector(0.0, 0.0), 1.0)
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val segments = c1.tangentsToCircle(c2)
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}
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assertFailsWith<Exception> {
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val c1 = Circle2D(vector(0.0, 0.0), 1.0)
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val c2 = Circle2D(vector(0.0, 0.0), 10.0)
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val segments = c1.tangentsToCircle(c2)
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}
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assertFailsWith<Exception> {
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val c1 = Circle2D(vector(0.0, 0.0), 1.0)
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val c2 = Circle2D(vector(2.0, 0.0), 1.0)
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val segments = c1.tangentsToCircle(c2)
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}
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assertFailsWith<Exception> {
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val c1 = Circle2D(vector(0.0, 0.0), 1.0)
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val c2 = Circle2D(vector(0.5, 0.0), 1.0)
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val segments = c1.tangentsToCircle(c2)
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}
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}
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}
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