Line circle intersection: Difference between revisions

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func (p point) String() string {

// hack to get rid of negative zero

⚫

return fmt.Sprintf("(%f, %f)", p.x, p.y)

// compiler treats 0 and -0 as being same

if p.x == 0 {

p.x = 0

}

if p.y == 0 {

p.y = 0

}

⚫

return fmt.Sprintf("(%g, %g)", p.x, p.y)

}

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fmt.Println("The intersection points (if any) between:")

fmt.Println("\n A circle, center (3, -5) with radius 3, and:")

fmt.Println("\n a line containing the points (-10, 11) and (10, 9) is/are:")

fmt.Println("\n a line containing the points (-10, 11) and (10, -9) is/are:")

fmt.Println(" ", intersects(point{-10, 11}, point{10, -9}, cp, r, false))

fmt.Println("\n a segment starting at (10, -11) and ending at (-11, 12) is/are")

fmt.Println("\n a segment starting at (-10, 11) and ending at (-11, 12) is/are")

fmt.Println(" ", intersects(point{-10, 11}, point{-11, 12}, cp, r, true))

fmt.Println("\n a horizontal line containing the points (3, -2) and (7, -2) is/are:")

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fmt.Println(" ", intersects(point{7, 4}, point{11, 8}, cp, r, true))

}</lang>

{{incorrect|Go|In main(), the output text and numbers differ, twice!!}}

<pre>

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A circle, center (3, -5) with radius 3, and:

a line containing the points (-10, 11) and (10, 9) is/are:

a line containing the points (-10, 11) and (10, -9) is/are:

[(6~~.000000~~, -5~~.000000~~) (3~~.000000~~, -2~~.000000~~)]

[(6, -5) (3, -2)]

a segment starting at (10, -11) and ending at (-11, 12) is/are

a segment starting at (-10, 11) and ending at (-11, 12) is/are

[]

a horizontal line containing the points (3, -2) and (7, -2) is/are:

[(3~~.000000~~, -2~~.000000~~)]

[(3, -2)]

A circle, center (0, 0) with radius 4, and:

a vertical line containing the points (0, -3) and (0, 6) is/are:

[(-0~~.000000~~, 4~~.000000~~) (0~~.000000~~, -4~~.000000~~)]

[(0, 4) (0, -4)]

a vertical segment starting at (0, -3) and ending at (0, 6) is/are:

[(-0~~.000000~~, 4~~.000000~~)]

[(0, 4)]

A circle, center (4, 2) with radius 5, and:

a line containing the points (6, 3) and (10, 7) is/are:

[(8~~.000000~~, 5~~.000000~~) (1~~.000000~~, -2~~.000000~~)]

[(8, 5) (1, -2)]

a segment starting at (7, 4) and ending at (11, 8) is/are:

[(8~~.000000~~, 5~~.000000~~)]

[(8, 5)]

</pre>