52 lines
1.1 KiB
Go
52 lines
1.1 KiB
Go
package clockface
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import (
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"math"
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"time"
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)
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const (
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secondsInHalfClock = 30
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secondsInClock = 2 * secondsInHalfClock
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minutesInHalfClock = 30
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minutesInClock = 2 * minutesInHalfClock
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hoursInHalfClock = 6
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hoursInClock = 2 * hoursInHalfClock
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)
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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 secondsInRadians(t time.Time) float64 {
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return math.Pi / (secondsInHalfClock / (float64(t.Second())))
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}
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func minutesInRadians(t time.Time) float64 {
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return secondsInRadians(t)/minutesInClock + math.Pi/(minutesInHalfClock/(float64(t.Minute())))
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}
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func hoursInRadians(t time.Time) float64 {
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return (minutesInRadians(t) / hoursInClock) + (math.Pi / (hoursInHalfClock / float64(t.Hour()%hoursInClock)))
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}
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func angleToPoint(angle float64) Point {
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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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func secondHandPoint(t time.Time) Point {
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return angleToPoint(secondsInRadians(t))
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}
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func minuteHandPoint(t time.Time) Point {
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return angleToPoint(minutesInRadians(t))
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}
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func hourHandPoint(t time.Time) Point {
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return angleToPoint(hoursInRadians(t))
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}
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