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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"
var clockCase = theme.C("fun", "clock")
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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.draw)
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element.core.SetMinimumSize(64, 64)
return
}
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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()
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element.core.DamageAll()
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}
}
func (element *AnalogClock) draw () {
bounds := element.Bounds()
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pattern, inset := theme.SunkenPattern(theme.PatternState {
Case: clockCase,
})
artist.FillRectangle(element, pattern, bounds)
bounds = inset.Apply(bounds)
foreground, _ := theme.ForegroundPattern(theme.PatternState {
Case: clockCase,
})
accent, _ := theme.AccentPattern(theme.PatternState {
Case: clockCase,
})
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for hour := 0; hour < 12; hour ++ {
element.radialLine (
foreground,
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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
element.radialLine(foreground, 0, 0.5, (hour - 3) / 6 * math.Pi)
element.radialLine(foreground, 0, 0.7, (minute - 15) / 30 * math.Pi)
element.radialLine(accent, 0, 0.7, (second - 15) / 30 * math.Pi)
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}
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// FlexibleHeightFor constrains the clock's minimum size to a 1:1 aspect ratio.
func (element *AnalogClock) FlexibleHeightFor (width int) (height int) {
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return width
}
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// OnFlexibleHeightChange sets a function to be calle dwhen the parameters
// affecting the clock's flexible height change.
func (element *AnalogClock) OnFlexibleHeightChange (func ()) { }
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func (element *AnalogClock) radialLine (
source artist.Pattern,
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inner float64,
outer float64,
radian float64,
) {
bounds := element.Bounds()
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width := float64(bounds.Dx()) / 2
height := float64(bounds.Dy()) / 2
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min := element.Bounds().Min.Add(image.Pt (
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int(math.Cos(radian) * inner * width + width),
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int(math.Sin(radian) * inner * height + height)))
max := element.Bounds().Min.Add(image.Pt (
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int(math.Cos(radian) * outer * width + width),
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int(math.Sin(radian) * outer * height + height)))
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// println(min.String(), max.String())
artist.Line(element, source, 1, min, max)
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}