This repository has been archived on 2023-08-08. You can view files and clone it, but cannot push or open issues or pull requests.
tomo-old/elements/fun/clock.go
2023-01-20 00:42:57 -05:00

97 lines
2.6 KiB
Go

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"
// AnalogClock can display the time of day in an analog format.
type AnalogClock struct {
*core.Core
core core.CoreControl
time time.Time
}
// NewAnalogClock creates a new analog clock that displays the specified time.
func NewAnalogClock (newTime time.Time) (element *AnalogClock) {
element = &AnalogClock { }
element.Core, element.core = core.NewCore(element)
element.core.SetMinimumSize(64, 64)
return
}
// Resize changes the size of the clock.
func (element *AnalogClock) Resize (width, height int) {
element.core.AllocateCanvas(width, height)
element.draw()
}
// SetTime changes the time that the clock displays.
func (element *AnalogClock) SetTime (newTime time.Time) {
if newTime == element.time { return }
element.time = newTime
if element.core.HasImage() {
element.draw()
element.core.DamageAll()
}
}
func (element *AnalogClock) draw () {
bounds := element.core.Bounds()
artist.FillRectangle (
element.core,
theme.SunkenPattern(),
bounds)
for hour := 0; hour < 12; hour ++ {
element.radialLine (
theme.ForegroundPattern(true),
0.8, 0.9, float64(hour) / 6 * math.Pi)
}
second := float64(element.time.Second())
minute := float64(element.time.Minute()) + second / 60
hour := float64(element.time.Hour()) + minute / 60
element.radialLine (
theme.ForegroundPattern(true),
0, 0.5, (hour - 3) / 6 * math.Pi)
element.radialLine (
theme.ForegroundPattern(true),
0, 0.7, (minute - 15) / 30 * math.Pi)
element.radialLine (
theme.AccentPattern(),
0, 0.7, (second - 15) / 30 * math.Pi)
}
// FlexibleHeightFor constrains the clock's minimum size to a 1:1 aspect ratio.
func (element *AnalogClock) FlexibleHeightFor (width int) (height int) {
return width
}
// OnFlexibleHeightChange sets a function to be calle dwhen the parameters
// affecting the clock's flexible height change.
func (element *AnalogClock) OnFlexibleHeightChange (func ()) { }
func (element *AnalogClock) radialLine (
source artist.Pattern,
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)
}