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package main
import (
"log"
"reflect"
"github.com/sgreben/jp/pkg/data"
"github.com/sgreben/jp/pkg/draw"
"github.com/sgreben/jp/pkg/plot"
)
func heatmapData(xv []reflect.Value, yv []reflect.Value, nbins uint) (heatmap *data.Heatmap) {
var x, y []float64
for i := range xv {
if xv[i].IsValid() && xv[i].CanInterface() {
xvi, ok := xv[i].Interface().(float64)
if ok {
x = append(x, xvi)
}
}
}
for i := range yv {
if yv[i].IsValid() && yv[i].CanInterface() {
yvi, ok := yv[i].Interface().(float64)
if ok {
y = append(y, yvi)
}
}
}
if len(x) != len(y) {
log.Fatal(len(x), " = len(x) != len(y) = ", len(y))
}
points := make([][2]float64, len(x))
for i := 0; i < len(x); i++ {
points[i] = [2]float64{x[i], y[i]}
}
if len(x) == 0 {
log.Fatal("no valid x values given")
}
bins := data.NewBins2D(points)
bins.X.Number = int(nbins)
bins.Y.Number = int(nbins)
if nbins == 0 {
bins.X.Number = data.BinsSturges(len(points))
bins.Y.Number = data.BinsSturges(len(points))
}
heatmap = data.NewHeatmap(data.Histogram2D(points, bins))
return
}
func heatmap(xv, yv []reflect.Value, c draw.Canvas, nbins uint) string {
heatmap := heatmapData(xv, yv, nbins)
chart := plot.NewHeatMap(c.GetBuffer())
return chart.Draw(heatmap)
}
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