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.
47 lines
1.3 KiB
Go
47 lines
1.3 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 WaterfallOptions struct {
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// Width and Height are dots; zeros mean 160 by 80.
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Width, Height int
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}
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// Waterfall walks a running total: Good up, Bad down.
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func Waterfall(c *ui.Context, text string, labels []string, deltas []float64, o WaterfallOptions) *ui.Element {
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k := pixel.K(c)
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if len(labels) != len(deltas) || len(deltas) == 0 {
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panic(fmt.Sprintf("chart: Waterfall has %d labels for %d steps", len(labels), len(deltas)))
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}
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w, h := size("Waterfall", o.Width, o.Height, 160, 80)
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totals := make([]float64, len(deltas)+1)
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for i, d := range deltas {
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totals[i+1] = totals[i] + d
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}
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lo, hi := span(totals)
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p := fit(lo, hi, w, h, labels)
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return ui.Box(c).Size(k.D(w), k.D(h)).Role(ui.RoleImage).Label(text).Description(read(labels, deltas)).Draw(func(pt *ui.Painter, r ui.Rect) {
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g := k.Canvas(pt, r)
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p.grid(g, labels)
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bw := max(1, p.w/len(deltas)*2/3)
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for i, d := range deltas {
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a, b := p.at(totals[i]), p.at(totals[i+1])
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ink := pixel.Good
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if d < 0 {
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ink = pixel.Bad
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}
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x := p.slot(i, len(deltas)) - bw/2
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g.Rect(x, min(a, b), bw, max(1, abs(a-b)), ink)
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if i+1 < len(deltas) {
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g.Checker(x+bw, b, p.slot(i+1, len(deltas))-bw/2-x-bw, 1, pixel.Edge)
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}
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}
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})
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}
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