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