package network.rs485.ben.computervision

import kotlin.test.Test
import kotlin.test.assertFalse
import kotlin.test.assertTrue

internal class LineTest {

    @Test
    fun `line intersect fails for lines on different y`() {
        val a = Pixel(0, 0) to Pixel(1, 0)
        val b = Pixel(0, 1) to Pixel(1, 1)
        assertFalse { a.intersects(b) }
        assertFalse { b.intersects(a) }
    }

    @Test
    fun `line intersect fails for unconnected lines`() {
        val a = Pixel(0, 0) to Pixel(1, 0)
        val b = Pixel(2, 0) to Pixel(3, 0)
        assertFalse { a.intersects(b) }
        assertFalse { b.intersects(a) }
    }

    @Test
    fun `line intersect succeeds for connected lines`() {
        val a = Pixel(0, 0) to Pixel(2, 0)
        val b = Pixel(1, 0) to Pixel(3, 0)
        assertTrue { a.intersects(b) }
        assertTrue { b.intersects(a) }
    }

    @Test
    fun `line intersect succeeds for stacked lines`() {
        val a = Pixel(0, 0) to Pixel(3, 0)
        val b = Pixel(1, 0) to Pixel(2, 0)
        assertTrue { a.intersects(b) }
        assertTrue { b.intersects(a) }
    }

}