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.
51 lines
1.4 KiB
Go
51 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 StackedBarOptions 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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// StackedBar stacks each category's series, one slot per series.
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func StackedBar(c *ui.Context, text string, labels []string, series []Series, o StackedBarOptions) *ui.Element {
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k := pixel.K(c)
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if len(labels) == 0 {
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panic("chart: StackedBar has no labels")
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}
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w, h := size("StackedBar", o.Width, o.Height, 160, 80)
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totals := make([]float64, len(labels))
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for _, s := range series {
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if len(s.Values) != len(labels) {
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panic(fmt.Sprintf("chart: series %q has %d values for %d labels", s.Name, len(s.Values), len(labels)))
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}
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for i, v := range s.Values {
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if v < 0 {
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panic(fmt.Sprintf("chart: series %q stacks a negative %v", s.Name, v))
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}
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totals[i] += v
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}
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}
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_, hi := span(totals)
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p := fit(0, 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(readSeries(labels, series)).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(labels)*2/3)
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for i := range labels {
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x, base := p.slot(i, len(labels))-bw/2, 0.0
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for j, s := range series {
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lo, top := p.at(base), p.at(base+s.Values[i])
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g.Rect(x, top, bw, lo-top, pick(s.Slot, j))
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base += s.Values[i]
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}
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}
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})
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}
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