Check for Point lies inside the polygon fails for some polygons.

[Sushi57]

Below code is nto giving consistent response.

val polygonPoints = listOf(Vector2D(-7232, -6772), Vector2D(-10264, -8480), Vector2D(-12741, -6421), Vector2D(-7600, -4456))
val vectorPath = Polygon(polygonPoints.toPointArrayList()).toVectorPath()

val point1 = Vector2D(610, -6554)

println(vectorPath.containsPoint(point1))             // true !!! ???
println(vectorPath.containsPoint(point1.x, point1.y)) // false

val point2 = Vector2D(610, -4455)

println(vectorPath.containsPoint(point2))             // false
println(vectorPath.containsPoint(point2.x, point2.y)) // false 

Another example,

areaPointsList =
[MyDummyCoordinate(x=-10484, y=12253), MyDummyCoordinate(x=-10686, y=11371), MyDummyCoordinate(x=-11336, y=9078), MyDummyCoordinate(x=-11577, y=7934), MyDummyCoordinate(x=-11822, y=7081), MyDummyCoordinate(x=-11926, y=6622), MyDummyCoordinate(x=-11825, y=6461), MyDummyCoordinate(x=-12292, y=4364), MyDummyCoordinate(x=-13100, y=1019), MyDummyCoordinate(x=-14048, y=-1745), MyDummyCoordinate(x=-15134, y=-1481), MyDummyCoordinate(x=-18144, y=-646), MyDummyCoordinate(x=-19864, y=-101), MyDummyCoordinate(x=-20136, y=-34), MyDummyCoordinate(x=-20108, y=752), MyDummyCoordinate(x=-20148, y=1196), MyDummyCoordinate(x=-20015, y=1509), MyDummyCoordinate(x=-20537, y=1562), MyDummyCoordinate(x=-20814, y=1696), MyDummyCoordinate(x=-20437, y=3038), MyDummyCoordinate(x=-18696, y=9507), MyDummyCoordinate(x=-18420, y=9806), MyDummyCoordinate(x=-18355, y=10038), MyDummyCoordinate(x=-18969, y=10040), MyDummyCoordinate(x=-18064, y=13517), MyDummyCoordinate(x=-17292, y=16289), MyDummyCoordinate(x=-16999, y=17845), MyDummyCoordinate(x=-16174, y=17425), MyDummyCoordinate(x=-16370, y=16593), MyDummyCoordinate(x=-16379, y=16397), MyDummyCoordinate(x=-16203, y=16299), MyDummyCoordinate(x=-16190, y=16995), MyDummyCoordinate(x=-10084, y=15381)]

testPointsList =
[[MyDummyCoordinate(x=2800, y=-6185), MyDummyCoordinate(x=2160, y=-6112), MyDummyCoordinate(x=3233, y=-5607), MyDummyCoordinate(x=3599, y=-4735), MyDummyCoordinate(x=3844, y=-2924), MyDummyCoordinate(x=4830, y=7186), MyDummyCoordinate(x=3381, y=10529), MyDummyCoordinate(x=1170, y=12420), MyDummyCoordinate(x=-11176, y=14253), MyDummyCoordinate(x=-13576, y=12567)], [MyDummyCoordinate(x=2800, y=-6185), MyDummyCoordinate(x=3304, y=-6401), MyDummyCoordinate(x=4039, y=-5006), MyDummyCoordinate(x=4510, y=-1021), MyDummyCoordinate(x=5194, y=6594), MyDummyCoordinate(x=4975, y=7928), MyDummyCoordinate(x=2548, y=13169)], [MyDummyCoordinate(x=2800, y=-6185), MyDummyCoordinate(x=3255, y=-6323)], [MyDummyCoordinate(x=2800, y=-6185), MyDummyCoordinate(x=2703, y=-5775), MyDummyCoordinate(x=3571, y=-5159), MyDummyCoordinate(x=4101, y=-3747), MyDummyCoordinate(x=4221, y=-657), MyDummyCoordinate(x=4816, y=7280)], [MyDummyCoordinate(x=2800, y=-6185), MyDummyCoordinate(x=343, y=-5605)]]

Two points from testPointsList falls inside polygon created with areaPointsList.
Yet, we get false result.

[reosfire]

It's actually even more weird. I wrote simple program that tests some points in range that i give they and draws a circle is the callback returns true.

Here is containsPoint(double, double)

containsPoint(point) is worse. It sometimes draws empty screen. But on some ranges it draws something like this

I wrote my own simple version of such algorithm to see that my drawing code works correctly.

You can use it if you want until the issue wouldn't be resolved

class MyPath(val points: List<Point>) {
    fun containsPoint(x: Double, y: Double): Boolean {
        var inside = false
        foreachSegment { x1, y1, x2, y2 ->
            val canIntersectY = y1 > y != y2 > y
            if (y1 == y2) {
                if (y == y1) {
                    return true
                }
            } else if (x1 == x2) {
                if (canIntersectY) {
                    inside = !inside
                }
            } else {
                val xIntersect = (x2 - x1) * (y - y1) / (y2 - y1) + x1
                if (canIntersectY && (xIntersect < x)) {
                    inside = !inside
                }
            }
        }
        return inside
    }

    private inline fun foreachSegment(block: (x1: Double, y1: Double, x2: Double, y2: Double) -> Unit) {
        for (i in 1 until points.size) {
            block(points[i - 1].x, points[i - 1].y, points[i].x, points[i].y)
        }
        block(points.last().x, points.last().y, points.first().x, points.first().y)
    }
}