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bar_series.go
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/
bar_series.go
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// MIT License
// Copyright (c) 2021 Tree Xie
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package charts
import (
"github.com/wcharczuk/go-chart/v2"
)
const defaultBarMargin = 10
type BarSeriesCustomStyle struct {
PointIndex int
Index int
Style chart.Style
}
type BarSeries struct {
BaseSeries
Count int
Index int
// 间隔
Margin int
// 偏移量
Offset int
// 宽度
BarWidth int
CustomStyles []BarSeriesCustomStyle
}
type barSeriesWidthValues struct {
columnWidth int
columnMargin int
margin int
barWidth int
}
func (bs BarSeries) GetBarStyle(index, pointIndex int) chart.Style {
// 指定样式
for _, item := range bs.CustomStyles {
if item.Index == index && item.PointIndex == pointIndex {
return item.Style
}
}
// 其它非指定样式
return chart.Style{}
}
func (bs BarSeries) getWidthValues(width int) barSeriesWidthValues {
columnWidth := width / bs.Len()
// 块间隔
columnMargin := columnWidth / 10
minColumnMargin := 2
if columnMargin < minColumnMargin {
columnMargin = minColumnMargin
}
margin := bs.Margin
if margin <= 0 {
margin = defaultBarMargin
}
// 如果margin大于column margin
if margin > columnMargin {
margin = columnMargin
}
allBarMarginWidth := (bs.Count - 1) * margin
barWidth := ((columnWidth - 2*columnMargin) - allBarMarginWidth) / bs.Count
if bs.BarWidth > 0 && bs.BarWidth < barWidth {
barWidth = bs.BarWidth
// 重新计息columnMargin
columnMargin = (columnWidth - allBarMarginWidth - (bs.Count * barWidth)) / 2
}
return barSeriesWidthValues{
columnWidth: columnWidth,
columnMargin: columnMargin,
margin: margin,
barWidth: barWidth,
}
}
func (bs BarSeries) Render(r chart.Renderer, canvasBox chart.Box, xrange, yrange chart.Range, defaults chart.Style) {
if bs.Len() == 0 || bs.Count <= 0 {
return
}
style := bs.Style.InheritFrom(defaults)
style.FillColor = style.StrokeColor
if !style.ShouldDrawStroke() {
return
}
cb := canvasBox.Bottom
cl := canvasBox.Left
widthValues := bs.getWidthValues(canvasBox.Width())
for i := 0; i < bs.Len(); i++ {
vx, vy := bs.GetValues(i)
customStyle := bs.GetBarStyle(bs.Index, i)
cloneStyle := style
if !customStyle.IsZero() {
cloneStyle.FillColor = customStyle.FillColor
cloneStyle.StrokeColor = customStyle.StrokeColor
}
x := cl + xrange.Translate(vx)
// 由于bar是居中展示,因此需要往前移一个显示块
x += (-widthValues.columnWidth + widthValues.columnMargin)
// 计算是第几个bar,位置右偏
x += bs.Index * (widthValues.margin + widthValues.barWidth)
y := cb - yrange.Translate(vy)
chart.Draw.Box(r, chart.Box{
Left: x,
Top: y,
Right: x + widthValues.barWidth,
Bottom: canvasBox.Bottom - 1,
}, cloneStyle)
}
}