112 lines
2.9 KiB
Go
112 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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"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 TitleOption struct {
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Text string
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Style chart.Style
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Left string
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Top string
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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 drawTitle(d *Draw, opt *TitleOption) (int, int, error) {
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if len(opt.Text) == 0 {
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return 0, 0, nil
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}
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padding := opt.Style.Padding
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titleDraw, err := NewDraw(DrawOption{
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Parent: d,
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}, PaddingOption(padding))
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if err != nil {
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return 0, 0, err
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}
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r := titleDraw.Render
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opt.Style.GetTextOptions().WriteToRenderer(r)
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arr := strings.Split(opt.Text, "\n")
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textMaxWidth := 0
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textMaxHeight := 0
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width := 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 > textMaxWidth {
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textMaxWidth = w
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}
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if h > textMaxHeight {
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textMaxHeight = 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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width = textMaxWidth
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titleX := 0
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b := titleDraw.Box
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switch opt.Left {
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case PositionRight:
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titleX = b.Width() - textMaxWidth
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case PositionCenter:
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titleX = b.Width()>>1 - (textMaxWidth >> 1)
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default:
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if strings.HasSuffix(opt.Left, "%") {
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value, _ := strconv.Atoi(strings.ReplaceAll(opt.Left, "%", ""))
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titleX = b.Width() * value / 100
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} else {
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value, _ := strconv.Atoi(opt.Left)
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titleX = value
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}
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}
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titleY := 0
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// TODO TOP 暂只支持数值
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if opt.Top != "" {
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value, _ := strconv.Atoi(opt.Top)
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titleY += value
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}
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for _, item := range measureOptions {
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x := titleX + (textMaxWidth-item.width)>>1
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titleDraw.text(item.text, x, titleY)
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titleY += textMaxHeight
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}
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height := titleY + padding.Top + padding.Bottom
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return width, height, nil
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}
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