ZacharyZhang-NY
596c62e026
Bars, lines, areas, pies, donuts, radar, histogram, scatter, bubbles, heatmaps, gauge, bullet, funnel, waterfall, treemap, candles, box plots, steps, rings, legend, axis, crosshair, polar area, pyramid, spectrum bars and win-loss strips, each drawn dot by dot. Ticks follow 1-2-5 steps and print as precisely as their step needs; a label row uses micro letters or the pixel font as a whole. Descriptions carry the data in numbers. Bad data panics.
52 lines
1.4 KiB
Go
52 lines
1.4 KiB
Go
package chart
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import (
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"fmt"
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"github.com/egoist/mygo/ui"
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"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
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)
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type FunnelOptions struct {
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// Width is in dots; zero means 160.
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Width int
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}
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// Funnel narrows stage by stage, each bar with its count.
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func Funnel(c *ui.Context, text string, stages []Slice, o FunnelOptions) *ui.Element {
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k := pixel.K(c)
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if len(stages) == 0 {
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panic("chart: Funnel has no stages")
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}
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w := pixel.Or("Funnel Width", o.Width, 160)
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top := stages[0].Value
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for i, s := range stages {
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span([]float64{s.Value})
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if s.Value < 0 || i > 0 && s.Value > stages[i-1].Value {
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panic(fmt.Sprintf("chart: Funnel stage %q has %v; stages must narrow from %v", s.Name, s.Value, top))
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}
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}
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gutter := 0
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for _, s := range stages {
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gutter = max(gutter, pixel.Measure(s.Name)+6)
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}
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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) {
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g := k.Canvas(p, r)
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room := w - gutter
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for i, s := range stages {
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bw := max(2, int(part(s.Value, top)*float64(room)))
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x, y := gutter+(room-bw)/2, i*pixel.LineHeight
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g.Text(0, y, s.Name, pixel.Faint, 1)
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g.Rect(x, y+2, bw, pixel.LineHeight-4, pick(s.Slot, i))
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// The count sits on its bar, or beside thin ones.
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n := num(s.Value)
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if tinyW(n)+4 <= bw {
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tiny(g, x+(bw-tinyW(n))/2, y+6, n, pixel.AccentInk)
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} else {
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tiny(g, x+bw+3, y+6, n, pixel.Ink)
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}
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}
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})
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}
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