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tomo-old/elements/fun/clock.go

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package fun
import "time"
import "math"
import "image"
import "git.tebibyte.media/sashakoshka/tomo/theme"
import "git.tebibyte.media/sashakoshka/tomo/artist"
import "git.tebibyte.media/sashakoshka/tomo/elements/core"
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// AnalogClock can display the time of day in an analog format.
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type AnalogClock struct {
*core.Core
core core.CoreControl
time time.Time
}
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// NewAnalogClock creates a new analog clock that displays the specified time.
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func NewAnalogClock (newTime time.Time) (element *AnalogClock) {
element = &AnalogClock { }
element.Core, element.core = core.NewCore(element)
element.core.SetMinimumSize(64, 64)
return
}
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// Resize changes the size of the clock.
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func (element *AnalogClock) Resize (width, height int) {
element.core.AllocateCanvas(width, height)
element.draw()
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}
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// SetTime changes the time that the clock displays.
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func (element *AnalogClock) SetTime (newTime time.Time) {
if newTime == element.time { return }
element.time = newTime
if element.core.HasImage() {
element.draw()
element.core.PushAll()
}
}
func (element *AnalogClock) draw () {
bounds := element.core.Bounds()
artist.FillRectangle (
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element.core,
theme.SunkenPattern(),
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bounds)
for hour := 0; hour < 12; hour ++ {
element.radialLine (
theme.ForegroundPattern(true),
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0.8, 0.9, float64(hour) / 6 * math.Pi)
}
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second := float64(element.time.Second())
minute := float64(element.time.Minute()) + second / 60
hour := float64(element.time.Hour()) + minute / 60
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element.radialLine (
theme.ForegroundPattern(true),
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0, 0.5, (hour - 3) / 6 * math.Pi)
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element.radialLine (
theme.ForegroundPattern(true),
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0, 0.7, (minute - 15) / 30 * math.Pi)
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element.radialLine (
theme.AccentPattern(),
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0, 0.7, (second - 15) / 30 * math.Pi)
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}
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// MinimumHeightFor constrains the clock's minimum size to a 1:1 aspect ratio.
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func (element *AnalogClock) MinimumHeightFor (width int) (height int) {
return width
}
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func (element *AnalogClock) radialLine (
source artist.Pattern,
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inner float64,
outer float64,
radian float64,
) {
bounds := element.core.Bounds()
width := float64(bounds.Dx()) / 2
height := float64(bounds.Dy()) / 2
min := image.Pt (
int(math.Cos(radian) * inner * width + width),
int(math.Sin(radian) * inner * height + height))
max := image.Pt (
int(math.Cos(radian) * outer * width + width),
int(math.Sin(radian) * outer * height + height))
// println(min.String(), max.String())
artist.Line(element.core, source, 1, min, max)
}