refactor: adjust axis function
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vicanso
parent
5068828ca7
commit
7e80e9a848
7 changed files with 134 additions and 107 deletions
394
painer.go
394
painer.go
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// 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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"bytes"
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"errors"
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"math"
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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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type Painter struct {
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render Renderer
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box Box
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font *truetype.Font
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parent *Painter
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style Style
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previousStyle Style
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}
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type PainterOptions struct {
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// Draw type, "svg" or "png", default type is "svg"
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Type string
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// The width of draw canvas
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Width int
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// The height of draw canvas
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Height int
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// The font for painter
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Font *truetype.Font
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}
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type PainterOption func(*Painter)
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// PainterPaddingOption sets the padding of draw canvas
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func PainterPaddingOption(padding Box) PainterOption {
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return func(p *Painter) {
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p.box.Left += padding.Left
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p.box.Top += padding.Top
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p.box.Right -= padding.Right
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p.box.Bottom -= padding.Bottom
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}
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}
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// PainterBoxOption sets the box of draw canvas
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func PainterBoxOption(box Box) PainterOption {
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return func(p *Painter) {
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if box.IsZero() {
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return
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}
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p.box = box
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}
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}
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// PainterFontOption sets the font of draw canvas
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func PainterFontOption(font *truetype.Font) PainterOption {
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return func(p *Painter) {
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p.font = font
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}
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}
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// PainterStyleOption sets the style of draw canvas
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func PainterStyleOption(style Style) PainterOption {
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return func(p *Painter) {
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p.SetDrawingStyle(style)
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}
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}
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// NewPainter creates a new Painter
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func NewPainter(opts PainterOptions, opt ...PainterOption) (*Painter, error) {
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if opts.Width <= 0 || opts.Height <= 0 {
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return nil, errors.New("width/height can not be nil")
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}
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font := opts.Font
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if font == nil {
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f, err := chart.GetDefaultFont()
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if err != nil {
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return nil, err
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}
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font = f
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}
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fn := chart.SVG
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if opts.Type == ChartOutputPNG {
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fn = chart.PNG
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}
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width := opts.Width
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height := opts.Height
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r, err := fn(width, height)
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if err != nil {
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return nil, err
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}
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p := &Painter{
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render: r,
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box: Box{
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Right: opts.Width,
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Bottom: opts.Height,
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},
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font: font,
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}
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p.setOptions(opt...)
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return p, nil
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}
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func (p *Painter) setOptions(opts ...PainterOption) {
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for _, fn := range opts {
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fn(p)
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}
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}
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func (p *Painter) Child(opt ...PainterOption) *Painter {
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child := &Painter{
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render: p.render,
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box: p.box.Clone(),
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font: p.font,
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parent: p,
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style: p.style,
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previousStyle: p.previousStyle,
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}
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child.setOptions(opt...)
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return child
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}
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func (p *Painter) SetStyle(style Style) {
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p.previousStyle = p.style
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p.style = style
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style.WriteToRenderer(p.render)
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}
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func (p *Painter) SetDrawingStyle(style Style) {
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p.previousStyle = p.style
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p.style = style
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style.WriteDrawingOptionsToRenderer(p.render)
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}
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func (p *Painter) SetTextStyle(style Style) {
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p.previousStyle = p.style
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p.style = style
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style.WriteTextOptionsToRenderer(p.render)
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}
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func (p *Painter) RestoreStyle() {
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p.style = p.previousStyle
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}
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// Bytes returns the data of draw canvas
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func (p *Painter) Bytes() ([]byte, error) {
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buffer := bytes.Buffer{}
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err := p.render.Save(&buffer)
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if err != nil {
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return nil, err
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}
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return buffer.Bytes(), err
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}
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// MoveTo moves the cursor to a given point
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func (p *Painter) MoveTo(x, y int) {
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p.render.MoveTo(x+p.box.Left, y+p.box.Top)
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}
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func (p *Painter) ArcTo(cx, cy int, rx, ry, startAngle, delta float64) {
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p.render.ArcTo(cx+p.box.Left, cy+p.box.Top, rx, ry, startAngle, delta)
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}
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func (p *Painter) LineTo(x, y int) {
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p.render.LineTo(x+p.box.Left, y+p.box.Top)
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}
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func (p *Painter) Pin(x, y, width int) {
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r := float64(width) / 2
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y -= width / 4
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angle := chart.DegreesToRadians(15)
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box := p.box
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startAngle := math.Pi/2 + angle
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delta := 2*math.Pi - 2*angle
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p.ArcTo(x, y, r, r, startAngle, delta)
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p.LineTo(x, y)
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p.Close()
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p.FillStroke()
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startX := x - int(r)
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startY := y
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endX := x + int(r)
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endY := y
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p.MoveTo(startX, startY)
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left := box.Left
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top := box.Top
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cx := x
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cy := y + int(r*2.5)
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p.render.QuadCurveTo(cx+left, cy+top, endX+left, endY+top)
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p.Close()
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p.Fill()
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}
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func (p *Painter) arrow(x, y, width, height int, direction string) {
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halfWidth := width >> 1
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halfHeight := height >> 1
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if direction == PositionTop || direction == PositionBottom {
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x0 := x - halfWidth
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x1 := x0 + width
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dy := -height / 3
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y0 := y
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y1 := y0 - height
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if direction == PositionBottom {
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y0 = y - height
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y1 = y
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dy = 2 * dy
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}
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p.MoveTo(x0, y0)
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p.LineTo(x0+halfWidth, y1)
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p.LineTo(x1, y0)
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p.LineTo(x0+halfWidth, y+dy)
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p.LineTo(x0, y0)
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} else {
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x0 := x + width
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x1 := x0 - width
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y0 := y - halfHeight
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dx := -width / 3
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if direction == PositionRight {
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x0 = x - width
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dx = -dx
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x1 = x0 + width
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}
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p.MoveTo(x0, y0)
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p.LineTo(x1, y0+halfHeight)
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p.LineTo(x0, y0+height)
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p.LineTo(x0+dx, y0+halfHeight)
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p.LineTo(x0, y0)
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}
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p.FillStroke()
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}
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func (p *Painter) ArrowLeft(x, y, width, height int) {
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p.arrow(x, y, width, height, PositionLeft)
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}
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func (p *Painter) ArrowRight(x, y, width, height int) {
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p.arrow(x, y, width, height, PositionRight)
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}
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func (p *Painter) ArrowTop(x, y, width, height int) {
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p.arrow(x, y, width, height, PositionTop)
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}
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func (p *Painter) ArrowBottom(x, y, width, height int) {
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p.arrow(x, y, width, height, PositionBottom)
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}
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func (p *Painter) Circle(radius float64, x, y int) {
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p.render.Circle(radius, x+p.box.Left, y+p.box.Top)
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}
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func (p *Painter) Stroke() {
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p.render.Stroke()
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}
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func (p *Painter) Close() {
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p.render.Close()
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}
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func (p *Painter) FillStroke() {
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p.render.FillStroke()
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}
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func (p *Painter) Fill() {
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p.render.Fill()
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}
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func (p *Painter) LineStroke(points []Point, style LineStyle) {
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s := style.Style()
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if !s.ShouldDrawStroke() {
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return
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}
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defer p.RestoreStyle()
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p.SetDrawingStyle(s.GetStrokeOptions())
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for index, point := range points {
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x := point.X
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y := point.Y
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if index == 0 {
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p.MoveTo(x, y)
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} else {
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p.LineTo(x, y)
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}
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}
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p.Stroke()
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}
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func (p *Painter) SetBackground(width, height int, color Color) {
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r := p.render
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s := chart.Style{
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FillColor: color,
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}
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defer p.RestoreStyle()
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p.SetStyle(s)
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// 设置背景色不使用box，因此不直接使用Painter
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r.MoveTo(0, 0)
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r.LineTo(width, 0)
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r.LineTo(width, height)
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r.LineTo(0, height)
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r.LineTo(0, 0)
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p.FillStroke()
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}
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func (p *Painter) MarkLine(x, y, width int) {
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arrowWidth := 16
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arrowHeight := 10
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endX := x + width
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p.Circle(3, x, y)
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p.render.Fill()
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p.MoveTo(x+5, y)
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p.LineTo(endX-arrowWidth, y)
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p.Stroke()
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p.render.SetStrokeDashArray([]float64{})
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p.ArrowRight(endX, y, arrowWidth, arrowHeight)
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}
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func (p *Painter) Polygon(center Point, radius float64, sides int) {
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points := getPolygonPoints(center, radius, sides)
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for i, item := range points {
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if i == 0 {
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p.MoveTo(item.X, item.Y)
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} else {
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p.LineTo(item.X, item.Y)
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}
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}
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p.LineTo(points[0].X, points[0].Y)
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p.Stroke()
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}
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func (p *Painter) FillArea(points []Point, s Style) {
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if !s.ShouldDrawFill() {
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return
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}
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defer p.RestoreStyle()
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var x, y int
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p.SetDrawingStyle(s.GetFillOptions())
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for index, point := range points {
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x = point.X
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y = point.Y
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if index == 0 {
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p.MoveTo(x, y)
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} else {
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p.LineTo(x, y)
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}
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}
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p.Fill()
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}
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func (p *Painter) Text(body string, x, y int) {
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p.render.Text(body, x+p.box.Left, y+p.box.Top)
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}
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func (p *Painter) TextFit(body string, x, y, width int) chart.Box {
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style := p.style
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textWarp := style.TextWrap
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style.TextWrap = chart.TextWrapWord
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r := p.render
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lines := chart.Text.WrapFit(r, body, width, style)
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p.SetTextStyle(style)
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var output chart.Box
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for index, line := range lines {
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x0 := x
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y0 := y + output.Height()
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p.Text(line, x0, y0)
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lineBox := r.MeasureText(line)
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output.Right = chart.MaxInt(lineBox.Right, output.Right)
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output.Bottom += lineBox.Height()
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if index < len(lines)-1 {
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output.Bottom += +style.GetTextLineSpacing()
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}
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}
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p.style.TextWrap = textWarp
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return output
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}
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