35 lines
715 B
Go
35 lines
715 B
Go
package clockface
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import (
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"git.nerdfortress.dev/mitch/clockface"
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"math"
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)
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const secondHandLength = 90
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const clockCentreX = 150
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const clockCentreY = 150
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type Point struct {
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X float64
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Y float64
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}
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func SecondHand(t time.Time) Point {
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p := secondHandPoint(t)
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p = Point{p.X * secondHandLength, p.Y * secondHandLength} //scale
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p = Point{p.X, -p.Y} //flip
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p = Point{p.X + clockCentreX, p.Y + clockCentreY} //translate
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return p
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}
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func secondsInRadians(t time.Time) float64 {
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return math.Pi / (30 / (float64(t.Second())))
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}
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func secondHandPoint(t time.Time) Point {
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angle := secondsInRadians(t)
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x := math.Sin(angle)
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y := math.Cos(angle)
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return Point{x, y}
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}
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