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horizontal_bar_chart.go
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/
horizontal_bar_chart.go
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// MIT License
// Copyright (c) 2022 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/golang/freetype/truetype"
"github.com/wcharczuk/go-chart/v2"
)
type horizontalBarChart struct {
p *Painter
opt *HorizontalBarChartOption
}
type HorizontalBarChartOption struct {
// The theme
Theme ColorPalette
// The font size
Font *truetype.Font
// The data series list
SeriesList SeriesList
// The x axis option
XAxis XAxisOption
// The padding of line chart
Padding Box
// The y axis option
YAxisOptions []YAxisOption
// The option of title
Title TitleOption
// The legend option
Legend LegendOption
}
// NewHorizontalBarChart returns a horizontal bar chart renderer
func NewHorizontalBarChart(p *Painter, opt HorizontalBarChartOption) *horizontalBarChart {
if opt.Theme == nil {
opt.Theme = defaultTheme
}
return &horizontalBarChart{
p: p,
opt: &opt,
}
}
func (h *horizontalBarChart) render(result *defaultRenderResult, seriesList SeriesList) (Box, error) {
p := h.p
opt := h.opt
seriesPainter := result.seriesPainter
yRange := result.axisRanges[0]
y0, y1 := yRange.GetRange(0)
height := int(y1 - y0)
// 每一块之间的margin
margin := 10
// 每一个bar之间的margin
barMargin := 5
if height < 20 {
margin = 2
barMargin = 2
} else if height < 50 {
margin = 5
barMargin = 3
}
seriesCount := len(seriesList)
// 总的高度-两个margin-(总数-1)的barMargin
barHeight := (height - 2*margin - barMargin*(seriesCount-1)) / len(seriesList)
theme := opt.Theme
max, min := seriesList.GetMaxMin(0)
xRange := NewRange(AxisRangeOption{
Min: min,
Max: max,
DivideCount: defaultAxisDivideCount,
Size: seriesPainter.Width(),
})
for index := range seriesList {
series := seriesList[index]
seriesColor := theme.GetSeriesColor(series.index)
divideValues := yRange.AutoDivide()
for j, item := range series.Data {
if j >= yRange.divideCount {
continue
}
// 显示位置切换
j = yRange.divideCount - j - 1
y := divideValues[j]
y += margin
if index != 0 {
y += index * (barHeight + barMargin)
}
w := int(xRange.getHeight(item.Value))
fillColor := seriesColor
if !item.Style.FillColor.IsZero() {
fillColor = item.Style.FillColor
}
right := w
seriesPainter.OverrideDrawingStyle(Style{
FillColor: fillColor,
}).Rect(chart.Box{
Top: y,
Left: 0,
Right: right,
Bottom: y + barHeight,
})
}
}
return p.box, nil
}
func (h *horizontalBarChart) Render() (Box, error) {
p := h.p
opt := h.opt
renderResult, err := defaultRender(p, defaultRenderOption{
Theme: opt.Theme,
Padding: opt.Padding,
SeriesList: opt.SeriesList,
XAxis: opt.XAxis,
YAxisOptions: opt.YAxisOptions,
TitleOption: opt.Title,
LegendOption: opt.Legend,
axisReversed: true,
})
if err != nil {
return BoxZero, err
}
seriesList := opt.SeriesList.Filter(ChartTypeHorizontalBar)
return h.render(renderResult, seriesList)
}