Files
8bitMyGoUI/chart/funnel.go
T
ZacharyZhang-NYandClaude Opus 5.5 03e1f91706 Upgrade MyGo to v0.5.5
Elements are now pass-scoped value handles: tests that read bounds
after a frame bind a ui.Handle. pixel tells frames apart by the build
pass's root, since the Tester clock no longer moves on its own.

Fix the regressions the upgrade brought:
- Clipboard reads in input handlers go through c.Services().
- MyGo notes an overlay's opener after building it, so AutoFocus
  inside lost it; pixel.AutoFocus focuses through a Handle, and
  archtest bans the raw call. Dialogs hand the focus back again.
- Elements around a press stay hovered: Tooltip tells a press-given
  focus by focus arriving under the pointer.
- The web host moves the Tester clock with real time, at most 500 ms
  a call, and gives components the real clock.

The gallery's source index also accepts CRLF checkouts.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
2026-10-17 01:31:08 -04:00

52 lines
1.4 KiB
Go

package chart
import (
"fmt"
"github.com/egoist/mygo/ui"
"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
)
type FunnelOptions struct {
// Width is in dots; zero means 160.
Width int
}
// Funnel narrows stage by stage, each bar with its count.
func Funnel(c *ui.Context, text string, stages []Slice, o FunnelOptions) ui.Element {
k := pixel.K(c)
if len(stages) == 0 {
panic("chart: Funnel has no stages")
}
w := pixel.Or("Funnel Width", o.Width, 160)
top := stages[0].Value
for i, s := range stages {
span([]float64{s.Value})
if s.Value < 0 || i > 0 && s.Value > stages[i-1].Value {
panic(fmt.Sprintf("chart: Funnel stage %q has %v; stages must narrow from %v", s.Name, s.Value, top))
}
}
gutter := 0
for _, s := range stages {
gutter = max(gutter, pixel.Measure(s.Name)+6)
}
return ui.Box(c).Size(k.D(w), k.D(len(stages)*pixel.LineHeight)).Role(ui.RoleImage).Label(text).Description(readSlices(stages)).Draw(func(p *ui.Painter, r ui.Rect) {
g := k.Canvas(p, r)
room := w - gutter
for i, s := range stages {
bw := max(2, int(part(s.Value, top)*float64(room)))
x, y := gutter+(room-bw)/2, i*pixel.LineHeight
g.Text(0, y, s.Name, pixel.Faint, 1)
g.Rect(x, y+2, bw, pixel.LineHeight-4, pick(s.Slot, i))
// The count sits on its bar, or beside thin ones.
n := num(s.Value)
if tinyW(n)+4 <= bw {
tiny(g, x+(bw-tinyW(n))/2, y+6, n, pixel.AccentInk)
} else {
tiny(g, x+bw+3, y+6, n, pixel.Ink)
}
}
})
}