128 lines
3.6 KiB
Go
128 lines
3.6 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/golang/freetype/truetype"
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"github.com/wcharczuk/go-chart/v2"
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"github.com/wcharczuk/go-chart/v2/drawing"
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)
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type lineChartOption struct {
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Theme string
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SeriesList SeriesList
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Font *truetype.Font
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}
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func lineChartRender(opt lineChartOption, result *basicRenderResult) ([]markPointRenderOption, error) {
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theme := NewTheme(opt.Theme)
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d, err := NewDraw(DrawOption{
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Parent: result.d,
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}, PaddingOption(chart.Box{
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Top: result.titleBox.Height(),
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Left: YAxisWidth,
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}))
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if err != nil {
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return nil, err
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}
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seriesNames := opt.SeriesList.Names()
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r := d.Render
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xRange := result.xRange
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markPointRenderOptions := make([]markPointRenderOption, 0)
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for i, s := range opt.SeriesList {
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// 由于series是for range，为同一个数据，因此需要clone
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// 后续需要使用，如mark point
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series := s
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index := series.index
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if index == 0 {
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index = i
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}
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seriesColor := theme.GetSeriesColor(index)
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yRange := result.getYRange(series.YAxisIndex)
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points := make([]Point, len(series.Data))
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// mark line
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markLineRender(markLineRenderOption{
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Draw: d,
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FillColor: seriesColor,
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FontColor: theme.GetTextColor(),
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StrokeColor: seriesColor,
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Font: opt.Font,
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Series: &series,
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Range: yRange,
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})
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for j, item := range series.Data {
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y := yRange.getRestHeight(item.Value)
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x := xRange.getWidth(float64(j))
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points[j] = Point{
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Y: y,
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X: x,
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}
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if !series.Label.Show {
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continue
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}
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distance := series.Label.Distance
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if distance == 0 {
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distance = 5
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}
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text := NewValueLabelFormater(seriesNames, series.Label.Formatter)(i, item.Value, -1)
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labelStyle := chart.Style{
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FontColor: theme.GetTextColor(),
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FontSize: labelFontSize,
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Font: opt.Font,
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}
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if !series.Label.Color.IsZero() {
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labelStyle.FontColor = series.Label.Color
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}
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labelStyle.GetTextOptions().WriteToRenderer(r)
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textBox := r.MeasureText(text)
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d.text(text, x-textBox.Width()>>1, y-distance)
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}
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dotFillColor := drawing.ColorWhite
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if theme.IsDark() {
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dotFillColor = seriesColor
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}
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d.Line(points, LineStyle{
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StrokeColor: seriesColor,
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StrokeWidth: 2,
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DotColor: seriesColor,
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DotWidth: 2,
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DotFillColor: dotFillColor,
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})
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// draw mark point
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markPointRenderOptions = append(markPointRenderOptions, markPointRenderOption{
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Draw: d,
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FillColor: seriesColor,
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Font: opt.Font,
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Points: points,
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Series: &series,
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})
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}
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return markPointRenderOptions, nil
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}
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