148 lines
3.7 KiB
Go
148 lines
3.7 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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"git.smarteching.com/zeni/go-chart/v2"
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)
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type labelRenderValue struct {
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Text string
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Style Style
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X int
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Y int
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// 旋转
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Radians float64
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}
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type LabelValue struct {
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Index int
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Value float64
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X int
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Y int
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// 旋转
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Radians float64
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// 字体颜色
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FontColor Color
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// 字体大小
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FontSize float64
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Orient string
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Offset Box
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}
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type SeriesLabelPainter struct {
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p *Painter
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seriesNames []string
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label *SeriesLabel
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theme ColorPalette
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font *truetype.Font
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values []labelRenderValue
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}
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type SeriesLabelPainterParams struct {
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P *Painter
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SeriesNames []string
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Label SeriesLabel
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Theme ColorPalette
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Font *truetype.Font
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}
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func NewSeriesLabelPainter(params SeriesLabelPainterParams) *SeriesLabelPainter {
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return &SeriesLabelPainter{
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p: params.P,
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seriesNames: params.SeriesNames,
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label: ¶ms.Label,
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theme: params.Theme,
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font: params.Font,
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values: make([]labelRenderValue, 0),
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}
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}
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func (o *SeriesLabelPainter) Add(value LabelValue) {
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label := o.label
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distance := label.Distance
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if distance == 0 {
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distance = 5
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}
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text := NewValueLabelFormatter(o.seriesNames, label.Formatter)(value.Index, value.Value, -1)
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labelStyle := Style{
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FontColor: o.theme.GetTextColor(),
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FontSize: labelFontSize,
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Font: o.font,
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}
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if value.FontSize != 0 {
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labelStyle.FontSize = value.FontSize
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}
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if !value.FontColor.IsZero() {
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label.Color = value.FontColor
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}
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if !label.Color.IsZero() {
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labelStyle.FontColor = label.Color
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}
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p := o.p
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p.OverrideDrawingStyle(labelStyle)
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rotated := value.Radians != 0
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if rotated {
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p.SetTextRotation(value.Radians)
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}
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textBox := p.MeasureText(text)
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renderValue := labelRenderValue{
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Text: text,
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Style: labelStyle,
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X: value.X,
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Y: value.Y,
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Radians: value.Radians,
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}
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if value.Orient != OrientHorizontal {
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renderValue.X -= textBox.Width() >> 1
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renderValue.Y -= distance
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} else {
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renderValue.X += distance
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renderValue.Y += textBox.Height() >> 1
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renderValue.Y -= 2
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}
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if rotated {
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renderValue.X = value.X + textBox.Width()>>1 - 1
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p.ClearTextRotation()
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} else {
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if textBox.Width()%2 != 0 {
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renderValue.X++
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}
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}
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renderValue.X += value.Offset.Left
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renderValue.Y += value.Offset.Top
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o.values = append(o.values, renderValue)
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}
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func (o *SeriesLabelPainter) Render() (Box, error) {
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for _, item := range o.values {
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o.p.OverrideTextStyle(item.Style)
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if item.Radians != 0 {
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o.p.TextRotation(item.Text, item.X, item.Y, item.Radians)
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} else {
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o.p.Text(item.Text, item.X, item.Y)
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}
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}
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return chart.BoxZero, nil
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}
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