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package main
import (
"fmt"
"log"
"reflect"
"github.com/sgreben/jp/pkg/data"
"github.com/sgreben/jp/pkg/draw"
"github.com/sgreben/jp/pkg/plot"
)
func barPlotData(xv, yv []reflect.Value) (x []string, y []float64) {
for i := range xv {
if xv[i].IsValid() && xv[i].CanInterface() {
x = append(x, fmt.Sprint(xv[i].Interface()))
}
}
for i := range yv {
if yv[i].IsValid() && yv[i].CanInterface() {
yvi, ok := yv[i].Interface().(float64)
if ok {
y = append(y, yvi)
}
}
}
return
}
func barPlot(xv, yv []reflect.Value, c draw.Canvas) string {
groups, y := barPlotData(xv, yv)
chart := plot.NewBarChart(c)
data := new(data.Table)
if len(y) == 0 {
log.Fatal("no valid y values given")
}
if len(groups) != len(y) {
for i := range y {
data.AddColumn(fmt.Sprint(i))
}
} else {
for _, g := range groups {
data.AddColumn(g)
}
}
data.AddRow(y...)
return chart.Draw(data)
}
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