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// Copyright 2017 Zack Guo <zack.y.guo@gmail.com>. All rights reserved.
// Use of this source code is governed by a MIT license that can
// be found in the LICENSE file.
package widgets
import (
"fmt"
"image"
rw "github.com/mattn/go-runewidth"
. "github.com/gizak/termui/v3"
)
type BarChart struct {
Block
BarColors []Color
LabelStyles []Style
NumStyles []Style // only Fg and Modifier are used
NumFormatter func(float64) string
Data []float64
Labels []string
BarWidth int
BarGap int
MaxVal float64
}
func NewBarChart() *BarChart {
return &BarChart{
Block: *NewBlock(),
BarColors: Theme.BarChart.Bars,
NumStyles: Theme.BarChart.Nums,
LabelStyles: Theme.BarChart.Labels,
NumFormatter: func(n float64) string { return fmt.Sprint(n) },
BarGap: 1,
BarWidth: 3,
}
}
func (self *BarChart) Draw(buf *Buffer) {
self.Block.Draw(buf)
maxVal := self.MaxVal
if maxVal == 0 {
maxVal, _ = GetMaxFloat64FromSlice(self.Data)
}
barXCoordinate := self.Inner.Min.X
for i, data := range self.Data {
// draw bar
height := int((data / maxVal) * float64(self.Inner.Dy()-1))
for x := barXCoordinate; x < MinInt(barXCoordinate+self.BarWidth, self.Inner.Max.X); x++ {
for y := self.Inner.Max.Y - 2; y > (self.Inner.Max.Y-2)-height; y-- {
c := NewCell(' ', NewStyle(ColorClear, SelectColor(self.BarColors, i)))
buf.SetCell(c, image.Pt(x, y))
}
}
// draw label
if i < len(self.Labels) {
labelXCoordinate := barXCoordinate +
int((float64(self.BarWidth) / 2)) -
int((float64(rw.StringWidth(self.Labels[i])) / 2))
buf.SetString(
self.Labels[i],
SelectStyle(self.LabelStyles, i),
image.Pt(labelXCoordinate, self.Inner.Max.Y-1),
)
}
// draw number
numberXCoordinate := barXCoordinate + int((float64(self.BarWidth) / 2))
if numberXCoordinate <= self.Inner.Max.X {
buf.SetString(
self.NumFormatter(data),
NewStyle(
SelectStyle(self.NumStyles, i+1).Fg,
SelectColor(self.BarColors, i),
SelectStyle(self.NumStyles, i+1).Modifier,
),
image.Pt(numberXCoordinate, self.Inner.Max.Y-2),
)
}
barXCoordinate += (self.BarWidth + self.BarGap)
}
}
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