25 lines
747 B
Go
25 lines
747 B
Go
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package rect
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import "math"
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type Rectangle struct {
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P1, P2, P3, P4 Point
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}
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func (r Rectangle) IsRect() bool {
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// make sure they aren't all just the same point
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if (r.P1.X == r.P2.X && r.P1.X == r.P3.X && r.P1.X == r.P4.X) &&
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(r.P1.Y == r.P2.Y && r.P1.Y == r.P3.Y && r.P1.Y == r.P4.Y) {
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return false
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}
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cx := (r.P1.X + r.P2.X + r.P3.X + r.P4.X) / 4.0
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cy := (r.P1.Y + r.P2.Y + r.P3.Y + r.P4.Y) / 4.0
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dd1 := math.Sqrt(math.Abs(cx-r.P1.X)) + math.Sqrt(math.Abs(cy-r.P1.Y))
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dd2 := math.Sqrt(math.Abs(cx-r.P2.X)) + math.Sqrt(math.Abs(cy-r.P2.Y))
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dd3 := math.Sqrt(math.Abs(cx-r.P3.X)) + math.Sqrt(math.Abs(cy-r.P3.Y))
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dd4 := math.Sqrt(math.Abs(cx-r.P4.X)) + math.Sqrt(math.Abs(cy-r.P4.Y))
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return dd1 == dd2 && dd1 == dd3 && dd1 == dd4
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}
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