96 lines
2.7 KiB
Go
96 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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"strconv"
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"strings"
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"github.com/wcharczuk/go-chart/v2"
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)
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type titleMeasureOption struct {
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width int
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height int
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text string
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}
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func NewTitleCustomize(title Title) chart.Renderable {
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return func(r chart.Renderer, cb chart.Box, chartDefaults chart.Style) {
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if len(title.Text) == 0 || title.Style.Hidden {
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return
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}
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if title.Font != nil {
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r.SetFont(title.Font)
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}
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r.SetFontColor(title.Style.FontColor)
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titleFontSize := title.Style.GetFontSize(chart.DefaultTitleFontSize)
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r.SetFontSize(titleFontSize)
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arr := strings.Split(title.Text, "\n")
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textWidth := 0
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textHeight := 0
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measureOptions := make([]titleMeasureOption, len(arr))
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for index, str := range arr {
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textBox := r.MeasureText(str)
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w := textBox.Width()
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h := textBox.Height()
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if w > textWidth {
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textWidth = w
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}
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if h > textHeight {
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textHeight = h
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}
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measureOptions[index] = titleMeasureOption{
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text: str,
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width: w,
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height: h,
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}
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}
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titleX := 0
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switch title.Left {
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case "right":
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titleX = cb.Left + cb.Width() - textWidth
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case "center":
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titleX = cb.Left + cb.Width()>>1 - (textWidth >> 1)
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default:
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if strings.HasSuffix(title.Left, "%") {
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value, _ := strconv.Atoi(strings.ReplaceAll(title.Left, "%", ""))
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titleX = cb.Left + cb.Width()*value/100
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} else {
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value, _ := strconv.Atoi(title.Left)
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titleX = cb.Left + value
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}
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}
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titleY := cb.Top + title.Style.Padding.GetTop(chart.DefaultTitleTop) + (textHeight >> 1)
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for _, item := range measureOptions {
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x := titleX + (textWidth-item.width)>>1
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r.Text(item.text, x, titleY)
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titleY += textHeight
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}
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}
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}
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