test: add series and legend test

bar_series_test.go

@@ -72,6 +72,7 @@ func TestBarSeriesGetWidthValues(t *testing.T) {
 		barWidth:     80,
 	}, widthValues)
 
+	// 指定margin
 	bs.Margin = 5
 	widthValues = bs.getWidthValues(300)
 	assert.Equal(barSeriesWidthValues{
@@ -81,6 +82,7 @@ func TestBarSeriesGetWidthValues(t *testing.T) {
 		barWidth:     80,
 	}, widthValues)
 
+	// 指定bar的宽度
 	bs.BarWidth = 60
 	widthValues = bs.getWidthValues(300)
 	assert.Equal(barSeriesWidthValues{
@@ -89,7 +91,6 @@ func TestBarSeriesGetWidthValues(t *testing.T) {
 		margin:       5,
 		barWidth:     60,
 	}, widthValues)
-
 }
 
 func TestBarSeriesRender(t *testing.T) {

base_series.go

@@ -51,55 +51,55 @@ type BaseSeries struct {
 }
 
 // GetName returns the name of the time series.
-func (cs BaseSeries) GetName() string {
+func (bs BaseSeries) GetName() string {
-	return cs.Name
+	return bs.Name
 }
 
 // GetStyle returns the line style.
-func (cs BaseSeries) GetStyle() chart.Style {
+func (bs BaseSeries) GetStyle() chart.Style {
-	return cs.Style
+	return bs.Style
 }
 
 // Len returns the number of elements in the series.
-func (cs BaseSeries) Len() int {
+func (bs BaseSeries) Len() int {
 	offset := 0
-	if cs.TickPosition == chart.TickPositionBetweenTicks {
+	if bs.TickPosition == chart.TickPositionBetweenTicks {
 		offset = -1
 	}
-	return len(cs.XValues) + offset
+	return len(bs.XValues) + offset
 }
 
 // GetValues gets the x,y values at a given index.
-func (cs BaseSeries) GetValues(index int) (float64, float64) {
+func (bs BaseSeries) GetValues(index int) (float64, float64) {
-	if cs.TickPosition == chart.TickPositionBetweenTicks {
+	if bs.TickPosition == chart.TickPositionBetweenTicks {
 		index++
 	}
-	return cs.XValues[index], cs.YValues[index]
+	return bs.XValues[index], bs.YValues[index]
 }
 
 // GetFirstValues gets the first x,y values.
-func (cs BaseSeries) GetFirstValues() (float64, float64) {
+func (bs BaseSeries) GetFirstValues() (float64, float64) {
 	index := 0
-	if cs.TickPosition == chart.TickPositionBetweenTicks {
+	if bs.TickPosition == chart.TickPositionBetweenTicks {
 		index++
 	}
-	return cs.XValues[index], cs.YValues[index]
+	return bs.XValues[index], bs.YValues[index]
 }
 
 // GetLastValues gets the last x,y values.
-func (cs BaseSeries) GetLastValues() (float64, float64) {
+func (bs BaseSeries) GetLastValues() (float64, float64) {
-	return cs.XValues[len(cs.XValues)-1], cs.YValues[len(cs.YValues)-1]
+	return bs.XValues[len(bs.XValues)-1], bs.YValues[len(bs.YValues)-1]
 }
 
 // GetValueFormatters returns value formatter defaults for the series.
-func (cs BaseSeries) GetValueFormatters() (x, y chart.ValueFormatter) {
+func (bs BaseSeries) GetValueFormatters() (x, y chart.ValueFormatter) {
-	if cs.XValueFormatter != nil {
+	if bs.XValueFormatter != nil {
-		x = cs.XValueFormatter
+		x = bs.XValueFormatter
 	} else {
 		x = chart.FloatValueFormatter
 	}
-	if cs.YValueFormatter != nil {
+	if bs.YValueFormatter != nil {
-		y = cs.YValueFormatter
+		y = bs.YValueFormatter
 	} else {
 		y = chart.FloatValueFormatter
 	}
@@ -107,26 +107,26 @@ func (cs BaseSeries) GetValueFormatters() (x, y chart.ValueFormatter) {
 }
 
 // GetYAxis returns which YAxis the series draws on.
-func (cs BaseSeries) GetYAxis() chart.YAxisType {
+func (bs BaseSeries) GetYAxis() chart.YAxisType {
-	return cs.YAxis
+	return bs.YAxis
 }
 
 // Render renders the series.
-func (cs BaseSeries) Render(r chart.Renderer, canvasBox chart.Box, xrange, yrange chart.Range, defaults chart.Style) {
+func (bs BaseSeries) Render(r chart.Renderer, canvasBox chart.Box, xrange, yrange chart.Range, defaults chart.Style) {
 	fmt.Println("should be override the function")
 }
 
 // Validate validates the series.
-func (cs BaseSeries) Validate() error {
+func (bs BaseSeries) Validate() error {
-	if len(cs.XValues) == 0 {
+	if len(bs.XValues) == 0 {
 		return fmt.Errorf("continuous series; must have xvalues set")
 	}
 
-	if len(cs.YValues) == 0 {
+	if len(bs.YValues) == 0 {
 		return fmt.Errorf("continuous series; must have yvalues set")
 	}
 
-	if len(cs.XValues) != len(cs.YValues) {
+	if len(bs.XValues) != len(bs.YValues) {
 		return fmt.Errorf("continuous series; must have same length xvalues as yvalues")
 	}
 	return nil

base_series_test.go

@@ -0,0 +1,94 @@
+// MIT License
+
+// Copyright (c) 2021 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/wcharczuk/go-chart/v2"
+)
+
+func TestBaseSeries(t *testing.T) {
+	assert := assert.New(t)
+
+	bs := BaseSeries{
+		XValues: []float64{
+			1,
+			2,
+			3,
+		},
+		YValues: []float64{
+			10,
+			20,
+			30,
+		},
+	}
+	assert.Equal(3, bs.Len())
+	bs.TickPosition = chart.TickPositionBetweenTicks
+	assert.Equal(2, bs.Len())
+
+	bs.TickPosition = chart.TickPositionUnset
+	x, y := bs.GetValues(1)
+	assert.Equal(float64(2), x)
+	assert.Equal(float64(20), y)
+	bs.TickPosition = chart.TickPositionBetweenTicks
+	x, y = bs.GetValues(1)
+	assert.Equal(float64(3), x)
+	assert.Equal(float64(30), y)
+
+	bs.TickPosition = chart.TickPositionUnset
+	x, y = bs.GetFirstValues()
+	assert.Equal(float64(1), x)
+	assert.Equal(float64(10), y)
+	bs.TickPosition = chart.TickPositionBetweenTicks
+	x, y = bs.GetFirstValues()
+	assert.Equal(float64(2), x)
+	assert.Equal(float64(20), y)
+
+	bs.TickPosition = chart.TickPositionUnset
+	x, y = bs.GetLastValues()
+	assert.Equal(float64(3), x)
+	assert.Equal(float64(30), y)
+	bs.TickPosition = chart.TickPositionBetweenTicks
+	x, y = bs.GetLastValues()
+	assert.Equal(float64(3), x)
+	assert.Equal(float64(30), y)
+
+	xFormater, yFormater := bs.GetValueFormatters()
+	assert.Equal(reflect.ValueOf(chart.FloatValueFormatter).Pointer(), reflect.ValueOf(xFormater).Pointer())
+	assert.Equal(reflect.ValueOf(chart.FloatValueFormatter).Pointer(), reflect.ValueOf(yFormater).Pointer())
+	formater := func(v interface{}) string {
+		return ""
+	}
+	bs.XValueFormatter = formater
+	bs.YValueFormatter = formater
+	xFormater, yFormater = bs.GetValueFormatters()
+	assert.Equal(reflect.ValueOf(formater).Pointer(), reflect.ValueOf(xFormater).Pointer())
+	assert.Equal(reflect.ValueOf(formater).Pointer(), reflect.ValueOf(yFormater).Pointer())
+
+	assert.Equal(chart.YAxisPrimary, bs.GetYAxis())
+
+	assert.Nil(bs.Validate())
+}

charts.go

@@ -70,10 +70,10 @@ type Graph interface {
 }
 
 func (o *Options) validate() error {
-	xAxisCount := len(o.XAxis.Data)
 	if len(o.Series) == 0 {
 		return errors.New("series can not be empty")
 	}
+	xAxisCount := len(o.XAxis.Data)
 
 	for _, item := range o.Series {
 		if item.Type != SeriesPie && len(item.Data) != xAxisCount {
@@ -83,6 +83,29 @@ func (o *Options) validate() error {
 	return nil
 }
 
+func (o *Options) getWidth() int {
+	width := o.Width
+	if width <= 0 {
+		width = DefaultChartWidth
+	}
+	return width
+}
+
+func (o *Options) getHeight() int {
+	height := o.Height
+	if height <= 0 {
+		height = DefaultChartHeight
+	}
+	return height
+}
+
+func (o *Options) getBackground() chart.Style {
+	bg := chart.Style{
+		Padding: o.Padding,
+	}
+	return bg
+}
+
 func render(g Graph, rp chart.RendererProvider) ([]byte, error) {
 	buf := bytes.Buffer{}
 	err := g.Render(rp, &buf)
@@ -99,46 +122,32 @@ func ToPNG(g Graph) ([]byte, error) {
 func ToSVG(g Graph) ([]byte, error) {
 	return render(g, chart.SVG)
 }
-func New(opt Options) (Graph, error) {
+
-	err := opt.validate()
+func newPieChart(opt Options) *chart.PieChart {
-	if err != nil {
+	values := make(chart.Values, len(opt.Series))
-		return nil, err
+	for index, item := range opt.Series {
-	}
+		values[index] = chart.Value{
-	tickPosition := opt.TickPosition
+			Value: item.Data[0].Value,
-	width := opt.Width
+			Label: item.Name,
-	if width <= 0 {
-		width = DefaultChartWidth
-	}
-	height := opt.Height
-	if height <= 0 {
-		height = DefaultChartHeight
-	}
-	bg := chart.Style{
-		Padding: opt.Padding,
-	}
-	if opt.Series[0].Type == SeriesPie {
-		values := make(chart.Values, len(opt.Series))
-		for index, item := range opt.Series {
-			values[index] = chart.Value{
-				Value: item.Data[0].Value,
-				Label: item.Name,
-			}
 		}
-		g := &chart.PieChart{
+	}
-			Background: bg,
+	return &chart.PieChart{
-			Title:      opt.Title.Text,
+		Background: opt.getBackground(),
-			TitleStyle: opt.Title.Style,
+		Title:      opt.Title.Text,
-			Width:      width,
+		TitleStyle: opt.Title.Style,
-			Height:     height,
+		Width:      opt.getWidth(),
-			Values:     values,
+		Height:     opt.getHeight(),
-			ColorPalette: &PieThemeColorPalette{
+		Values:     values,
-				ThemeColorPalette: ThemeColorPalette{
+		ColorPalette: &PieThemeColorPalette{
-					Theme: opt.Theme,
+			ThemeColorPalette: ThemeColorPalette{
-				},
+				Theme: opt.Theme,
 			},
-		}
+		},
-		return g, nil
 	}
+}
+
+func newChart(opt Options) *chart.Chart {
+	tickPosition := opt.TickPosition
 
 	xAxis, xValues := GetXAxisAndValues(opt.XAxis, tickPosition, opt.Theme)
 
@@ -164,16 +173,16 @@ func New(opt Options) (Graph, error) {
 		yAxisOption = opt.YAxisOptions[1]
 	}
 
-	g := &chart.Chart{
+	c := &chart.Chart{
 		Log:        opt.Log,
-		Background: bg,
+		Background: opt.getBackground(),
 		ColorPalette: &ThemeColorPalette{
 			Theme: opt.Theme,
 		},
 		Title:          opt.Title.Text,
 		TitleStyle:     opt.Title.Style,
-		Width:          width,
+		Width:          opt.getWidth(),
-		Height:         height,
+		Height:         opt.getHeight(),
 		XAxis:          xAxis,
 		YAxis:          GetYAxis(opt.Theme, yAxisOption),
 		YAxisSecondary: GetSecondaryYAxis(opt.Theme, secondaryYAxisOption),
@@ -182,8 +191,8 @@ func New(opt Options) (Graph, error) {
 
 	// 设置secondary的样式
 	if legendSize != 0 {
-		g.Elements = []chart.Renderable{
+		c.Elements = []chart.Renderable{
-			LegendCustomize(g, LegendOption{
+			LegendCustomize(c.Series, LegendOption{
 				Theme:        opt.Theme,
 				TextPosition: LegendTextPositionRight,
 				IconDraw:     DefaultLegendIconDraw,
@@ -192,5 +201,17 @@ func New(opt Options) (Graph, error) {
 			}),
 		}
 	}
-	return g, nil
+	return c
+}
+
+func New(opt Options) (Graph, error) {
+	err := opt.validate()
+	if err != nil {
+		return nil, err
+	}
+	if opt.Series[0].Type == SeriesPie {
+		return newPieChart(opt), nil
+	}
+
+	return newChart(opt), nil
 }

charts_test.go

@@ -0,0 +1,143 @@
+// MIT License
+
+// Copyright (c) 2021 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/wcharczuk/go-chart/v2"
+)
+
+func TestChartsOptions(t *testing.T) {
+	assert := assert.New(t)
+
+	o := Options{}
+
+	assert.Equal(errors.New("series can not be empty"), o.validate())
+
+	o.Series = []Series{
+		{
+			Data: []SeriesData{
+				{
+					Value: 1,
+				},
+			},
+		},
+	}
+	assert.Equal(errors.New("series and xAxis is not matched"), o.validate())
+	o.XAxis.Data = []string{
+		"1",
+	}
+	assert.Nil(o.validate())
+
+	assert.Equal(DefaultChartWidth, o.getWidth())
+	o.Width = 10
+	assert.Equal(10, o.getWidth())
+
+	assert.Equal(DefaultChartHeight, o.getHeight())
+	o.Height = 10
+	assert.Equal(10, o.getHeight())
+
+	padding := chart.NewBox(10, 10, 10, 10)
+	o.Padding = padding
+	assert.Equal(padding, o.getBackground().Padding)
+}
+
+func TestNewPieChart(t *testing.T) {
+	assert := assert.New(t)
+
+	data := []Series{
+		{
+			Data: []SeriesData{
+				{
+					Value: 10,
+				},
+			},
+			Name: "chrome",
+		},
+		{
+			Data: []SeriesData{
+				{
+					Value: 2,
+				},
+			},
+			Name: "edge",
+		},
+	}
+	pie := newPieChart(Options{
+		Series: data,
+	})
+	for index, item := range pie.Values {
+		assert.Equal(data[index].Name, item.Label)
+		assert.Equal(data[index].Data[0].Value, item.Value)
+	}
+}
+
+func TestNewChart(t *testing.T) {
+	assert := assert.New(t)
+
+	data := []Series{
+		{
+			Data: []SeriesData{
+				{
+					Value: 10,
+				},
+				{
+					Value: 20,
+				},
+			},
+			Name: "chrome",
+		},
+		{
+			Data: []SeriesData{
+				{
+					Value: 2,
+				},
+				{
+					Value: 3,
+				},
+			},
+			Name: "edge",
+		},
+	}
+
+	c := newChart(Options{
+		Series: data,
+	})
+	assert.Empty(c.Elements)
+	for index, series := range c.Series {
+		assert.Equal(data[index].Name, series.GetName())
+	}
+
+	c = newChart(Options{
+		Legend: Legend{
+			Data: []string{
+				"chrome",
+				"edge",
+			},
+		},
+	})
+	assert.Equal(1, len(c.Elements))
+}

legend.go

@@ -59,8 +59,8 @@ func DefaultLegendIconDraw(r chart.Renderer, opt LegendIconDrawOption) {
 		return
 	}
 	r.SetStrokeColor(opt.Style.GetStrokeColor())
-	stokeWidth := opt.Style.GetStrokeWidth()
+	strokeWidth := opt.Style.GetStrokeWidth()
-	r.SetStrokeWidth(stokeWidth)
+	r.SetStrokeWidth(strokeWidth)
 	height := opt.Box.Bottom - opt.Box.Top
 	ly := opt.Box.Top - (height / 2) + 2
 	r.MoveTo(opt.Box.Left, ly)
@@ -71,7 +71,7 @@ func DefaultLegendIconDraw(r chart.Renderer, opt LegendIconDrawOption) {
 	r.FillStroke()
 }
 
-func LegendCustomize(c *chart.Chart, opt LegendOption) chart.Renderable {
+func LegendCustomize(series []chart.Series, opt LegendOption) chart.Renderable {
 	return func(r chart.Renderer, cb chart.Box, chartDefaults chart.Style) {
 		legendDefaults := chart.Style{
 			FontColor:   getTextColor(opt.Theme),
@@ -87,7 +87,7 @@ func LegendCustomize(c *chart.Chart, opt LegendOption) chart.Renderable {
 
 		var labels []string
 		var lines []chart.Style
-		for _, s := range c.Series {
+		for _, s := range series {
 			if !s.GetStyle().Hidden {
 				if _, isAnnotationSeries := s.(chart.AnnotationSeries); !isAnnotationSeries {
 					labels = append(labels, s.GetName())

legend_test.go

@@ -0,0 +1,62 @@
+// MIT License
+
+// Copyright (c) 2021 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/wcharczuk/go-chart/v2"
+)
+
+func TestLegendCustomize(t *testing.T) {
+	assert := assert.New(t)
+
+	series := GetSeries([]Series{
+		{
+			Name: "chrome",
+		},
+		{
+			Name: "edge",
+		},
+	}, chart.TickPositionBetweenTicks, "")
+	r, err := chart.SVG(800, 600)
+	assert.Nil(err)
+	fn := LegendCustomize(series, LegendOption{
+		TextPosition: LegendTextPositionRight,
+		IconDraw:     DefaultLegendIconDraw,
+		Align:        LegendAlignLeft,
+		Padding: chart.Box{
+			Left: 100,
+			Top:  100,
+		},
+	})
+	fn(r, chart.NewBox(11, 47, 784, 373), chart.Style{
+		Font: chart.StyleTextDefaults().Font,
+	})
+	buf := bytes.Buffer{}
+	err = r.Save(&buf)
+	assert.Nil(err)
+	assert.Equal("<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"800\" height=\"600\">\\n<path  d=\"M 100 100\nL 208 100\nL 208 110\nL 100 110\nL 100 100\" style=\"stroke-width:0;stroke:rgba(51,51,51,1.0);fill:none\"/><path  d=\"M 100 107\nL 125 107\" style=\"stroke-width:2;stroke:rgba(84,112,198,1.0);fill:none\"/><circle cx=\"112\" cy=\"107\" r=\"5\" style=\"stroke-width:2;stroke:rgba(84,112,198,1.0);fill:rgba(255,255,255,1.0)\"/><path  d=\"\" style=\"stroke-width:2;stroke:rgba(84,112,198,1.0);fill:rgba(255,255,255,1.0)\"/><text x=\"130\" y=\"110\" style=\"stroke-width:0;stroke:none;fill:rgba(51,51,51,1.0);font-size:10.2px;font-family:'Roboto Medium',sans-serif\">chrome</text><path  d=\"M 185 107\nL 210 107\" style=\"stroke-width:2;stroke:rgba(145,204,117,1.0);fill:rgba(255,255,255,1.0)\"/><circle cx=\"197\" cy=\"107\" r=\"5\" style=\"stroke-width:2;stroke:rgba(145,204,117,1.0);fill:rgba(255,255,255,1.0)\"/><path  d=\"\" style=\"stroke-width:2;stroke:rgba(145,204,117,1.0);fill:rgba(255,255,255,1.0)\"/><text x=\"215\" y=\"110\" style=\"stroke-width:0;stroke:none;fill:rgba(51,51,51,1.0);font-size:10.2px;font-family:'Roboto Medium',sans-serif\">edge</text></svg>", buf.String())
+}