103 lines
2.9 KiB
Go
103 lines
2.9 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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)
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func NewMarkPoint(markPointTypes ...string) SeriesMarkPoint {
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data := make([]SeriesMarkData, len(markPointTypes))
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for index, t := range markPointTypes {
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data[index] = SeriesMarkData{
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Type: t,
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}
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}
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return SeriesMarkPoint{
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Data: data,
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}
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}
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type markPointPainter struct {
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p *Painter
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options []markPointRenderOption
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}
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func (m *markPointPainter) Add(opt markPointRenderOption) {
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m.options = append(m.options, opt)
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}
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type markPointRenderOption struct {
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FillColor Color
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Font *truetype.Font
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Series Series
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Points []Point
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}
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func NewMarkPointPainter(p *Painter) *markPointPainter {
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return &markPointPainter{
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p: p,
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options: make([]markPointRenderOption, 0),
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}
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}
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func (m *markPointPainter) Render() (Box, error) {
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painter := m.p
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theme := m.p.theme
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for _, opt := range m.options {
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s := opt.Series
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if len(s.MarkPoint.Data) == 0 {
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continue
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}
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points := opt.Points
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summary := s.Summary()
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symbolSize := s.MarkPoint.SymbolSize
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if symbolSize == 0 {
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symbolSize = 30
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}
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painter.OverrideDrawingStyle(Style{
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FillColor: opt.FillColor,
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}).OverrideTextStyle(Style{
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FontColor: theme.GetTextColor(),
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FontSize: labelFontSize,
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StrokeWidth: 1,
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Font: opt.Font,
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})
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for _, markPointData := range s.MarkPoint.Data {
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p := points[summary.MinIndex]
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value := summary.MinValue
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switch markPointData.Type {
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case SeriesMarkDataTypeMax:
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p = points[summary.MaxIndex]
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value = summary.MaxValue
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}
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painter.Pin(p.X, p.Y-symbolSize>>1, symbolSize)
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text := commafWithDigits(value)
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textBox := painter.MeasureText(text)
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painter.Text(text, p.X-textBox.Width()>>1, p.Y-symbolSize>>1-2)
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}
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}
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return chart.BoxZero, nil
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}
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