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.
41 lines
1.1 KiB
Go
41 lines
1.1 KiB
Go
package chart
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import (
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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 SparklineOptions struct {
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// Width is in dots; zero means 48.
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Width int
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Slot pixel.Slot
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}
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// Sparkline is a line one text line high, end marked.
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func Sparkline(c *ui.Context, text string, values []float64, o SparklineOptions) *ui.Element {
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k := pixel.K(c)
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w := pixel.Or("Sparkline Width", o.Width, 48)
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if len(values) < 2 {
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panic("chart: Sparkline needs two values or more")
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}
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lo, hi := span(values)
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if hi == lo {
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hi = lo + 1
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}
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ink := pick(o.Slot, 0)
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at := func(i int) (int, int) {
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return i * (w - 2) / (len(values) - 1), pixel.LineHeight - 3 - int((values[i]-lo)/(hi-lo)*float64(pixel.LineHeight-6))
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}
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return ui.Box(c).Size(k.D(w), k.D(pixel.LineHeight)).Role(ui.RoleImage).Label(text).Description(nums(values)).Draw(func(pt *ui.Painter, r ui.Rect) {
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g := k.Canvas(pt, r)
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for i := 1; i < len(values); i++ {
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x0, y0 := at(i - 1)
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x1, y1 := at(i)
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g.Line(x0, y0, x1, y1, ink)
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}
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x, y := at(len(values) - 1)
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g.Rect(x, y-1, 2, 2, pixel.Accent)
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})
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}
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