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