134 lines
3.4 KiB
Go
134 lines
3.4 KiB
Go
// MIT License
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// Copyright (c) 2022 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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type lineChart struct {
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p *Painter
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opt *LineChartOption
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}
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func NewLineChart(p *Painter, opt LineChartOption) *lineChart {
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if opt.Theme == nil {
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opt.Theme = NewTheme("")
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}
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return &lineChart{
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p: p,
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opt: &opt,
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}
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}
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type LineChartOption struct {
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Theme ColorPalette
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// The data series list
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SeriesList SeriesList
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// The x axis option
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XAxis XAxisOption
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// The padding of line chart
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Padding Box
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// The y axis option
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YAxis YAxisOption
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}
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func (l *lineChart) Render() (Box, error) {
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p := l.p
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opt := l.opt
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p = defaultRender(p, defaultRenderOption{
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Theme: opt.Theme,
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Padding: opt.Padding,
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})
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seriesList := opt.SeriesList
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seriesList.init()
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// 过滤前先计算最大最小值
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max, min := seriesList.GetMaxMin()
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seriesList = seriesList.Filter(ChartTypeLine)
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// Y轴
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yr := NewRange(AxisRangeOption{
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Min: min,
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Max: max,
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// 高度需要减去x轴的高度
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Size: p.Height() - defaultXAxisHeight,
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DivideCount: defaultAxisDivideCount,
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})
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if opt.YAxis.Theme == nil {
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opt.YAxis.Theme = opt.Theme
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}
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opt.YAxis.Data = yr.Values()
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reverseStringSlice(opt.YAxis.Data)
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yAxis := NewLeftYAxis(p, opt.YAxis)
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yAxisBox, err := yAxis.Render()
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if err != nil {
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return chart.BoxZero, err
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}
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seriesPainter := p.Child(PainterPaddingOption(Box{
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Bottom: defaultXAxisHeight,
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Left: yAxisBox.Width(),
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}))
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if opt.XAxis.Theme == nil {
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opt.XAxis.Theme = opt.Theme
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}
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xAxis := NewBottomXAxis(p.Child(PainterPaddingOption(Box{
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Left: yAxisBox.Width(),
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})), opt.XAxis)
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xDivideValues := autoDivide(seriesPainter.Width(), len(opt.XAxis.Data))
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xValues := make([]int, len(xDivideValues)-1)
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for i := 0; i < len(xDivideValues)-1; i++ {
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xValues[i] = (xDivideValues[i] + xDivideValues[i+1]) >> 1
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}
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for index, series := range seriesList {
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seriesColor := opt.Theme.GetSeriesColor(index)
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seriesPainter.SetDrawingStyle(Style{
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StrokeColor: seriesColor,
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StrokeWidth: 2,
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FillColor: seriesColor,
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})
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points := make([]Point, 0)
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for i, item := range series.Data {
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h := yr.getRestHeight(item.Value)
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p := Point{
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X: xValues[i],
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Y: h,
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}
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points = append(points, p)
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}
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seriesPainter.LineStroke(points)
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seriesPainter.Dots(points)
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}
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err = doRender(
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xAxis,
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)
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if err != nil {
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return chart.BoxZero, err
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}
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return p.box, nil
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}
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