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.
58 lines
1.6 KiB
Go
58 lines
1.6 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 CrosshairOptions 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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// Crosshair is a line chart; hover crosses the nearest point.
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func Crosshair(c *ui.Context, text string, labels []string, series []Series, o CrosshairOptions) *ui.Element {
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k := pixel.K(c)
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w, h := size("Crosshair", o.Width, o.Height, 160, 80)
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p := fitSeries(labels, series, w, h)
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e := ui.Box(c).Size(k.D(w), k.D(h)).Role(ui.RoleImage).Label(text).Description(readSeries(labels, series))
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at, py := -1, 0
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if x, y, over := e.PointerPosition(); over && len(labels) > 0 {
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at = max(0, min(len(labels)-1, (int(x/k.Dot())-p.x)*len(labels)/max(1, p.w)))
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py = max(p.y, min(p.y+p.h-1, int(y/k.Dot())))
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}
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return e.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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lines(g, p, len(labels), series)
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if at < 0 {
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return
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}
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x := p.slot(at, len(labels))
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g.Checker(x, p.y, 1, p.h, pixel.Ink)
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g.Checker(p.x, py, p.w, 1, pixel.Ink)
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// The readout lists the label, then each series' value.
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rows := []string{labels[at]}
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for _, s := range series {
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rows = append(rows, num(s.Values[at]))
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}
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bw, bh := 4, 3
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for _, row := range rows {
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bw, bh = max(bw, tinyW(row)+4), bh+inkH(small(row))+2
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}
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bx := min(w-bw, x+3)
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g.Frame(bx, p.y, bw, bh, pixel.Flat, pixel.Lit)
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y := p.y + 2
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for i, row := range rows {
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ink := pixel.Ink
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if i > 0 {
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ink = pick(series[i-1].Slot, i-1)
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}
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sm := small(row)
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mark(g, bx+2, y, row, sm, ink)
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y += inkH(sm) + 2
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}
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})
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}
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