Files
8bitMyGoUI/feedback/countup.go
T
ZacharyZhang-NY 86a6901333 Add game components 269-290; CommandMenu AutoFocus
Press start, title screen, save slots, options menu, game over with
CONTINUE, credits roll, ending card, loading tips, letterbox, mission
brief, achievements, result screen, crafting grid, loot popup,
treasure chest, gacha reel, interact prompt, turn order, battle log,
target selector, ATB gauge and stamina bar. Cued effects count runs,
so each cue change plays once and reports once. CommandMenu takes
AutoFocus when enabled. HealthBar, ManaBar and CountUp keep exact
colors, ticks and counts for the largest ints.
2026-10-12 02:48:20 -04:00

58 lines
1.4 KiB
Go
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package feedback
import (
"strconv"
"time"
"github.com/egoist/mygo/ui"
"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
)
type CountUpOptions struct {
// Scale is 1–4; zero means 1.
Scale int
Slot pixel.Slot
}
type countKey struct{}
// counting runs from one value to the next.
type counting struct {
from, to int
at time.Time
}
// CountUp counts to a new value in eight steps.
func CountUp(c *ui.Context, value int, o CountUpOptions) *ui.Element {
k := pixel.K(c)
sc := pixel.Or("CountUp Scale", o.Scale, 1)
e := ui.Box(c).Role(ui.RoleText).Label(strconv.Itoa(value))
s := ui.Local(e, countKey{}, func() counting { return counting{from: value, to: value} })
shown := func() int {
step := 8
if !k.Reduce() {
step = k.Since(c, s.at, 15, 8)
}
return lerp(s.from, s.to, step)
}
if value != s.to {
s.from, s.to, s.at = shown(), value, k.Now()
}
n := strconv.Itoa(shown())
w := max(pixel.Measure(strconv.Itoa(s.from)), pixel.Measure(strconv.Itoa(s.to)))
return e.Size(k.D(w*sc), k.D(pixel.LineHeight*sc)).Draw(func(p *ui.Painter, r ui.Rect) {
k.Canvas(p, r).Text(0, 0, n, o.Slot, sc)
})
}
// lerp moves step eighths from a toward b, overflow-free.
func lerp(a, b, step int) int {
if b >= a {
d := uint64(b) - uint64(a)
return int(uint64(a) + d/8*uint64(step) + d%8*uint64(step)/8)
}
d := uint64(a) - uint64(b)
return int(uint64(a) - (d/8*uint64(step) + d%8*uint64(step)/8))
}