test: add test for legend and draw

axis.go

@@ -32,19 +32,32 @@ import (
 
 type AxisOption struct {
 	BoundaryGap *bool
+	// The flag for show axis, set this to *false will hide axis
 	Show *bool
+	// The position of axis, it can be 'left', 'top', 'right' or 'bottom'
 	Position string
+	// Number of segments that the axis is split into. Note that this number serves only as a recommendation.
 	SplitNumber int
 	ClassName   string
+	// The line color of axis
 	StrokeColor drawing.Color
+	// The line width
 	StrokeWidth float64
+	// The length of the axis tick
 	TickLength int
+	// The flag for show axis tick, set this to *false will hide axis tick
 	TickShow *bool
+	// The margin value of label
 	LabelMargin int
+	// The font size of label
 	FontSize float64
+	// The font of label
 	Font *truetype.Font
+	// The color of label
 	FontColor drawing.Color
+	// The flag for show axis split line, set this to true will show axis split line
 	SplitLineShow bool
+	// The color of split line
 	SplitLineColor drawing.Color
 }
 
@@ -380,6 +393,7 @@ func (a *axis) measureAxis() int {
 	return textMaxHeight + value
 }
 
+// Render renders the axis for chart
 func (a *axis) Render() {
 	style := a.style
 	if isFalse(style.Show) {

bar.go

@@ -43,6 +43,7 @@ func (bs *BarStyle) Style() chart.Style {
 	}
 }
 
+// Bar renders bar for chart
 func (d *Draw) Bar(b chart.Box, style BarStyle) {
 	s := style.Style()
 

draw_test.go

@@ -23,6 +23,8 @@
 package charts
 
 import (
+	"fmt"
+	"math"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -224,6 +226,20 @@ func TestDraw(t *testing.T) {
 			},
 			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"400\" height=\"300\">\\n<path  d=\"M 0 0\nL 400 0\nL 400 300\nL 0 300\nL 0 0\" style=\"stroke-width:0;stroke:none;fill:rgba(255,255,255,1.0)\"/></svg>",
 		},
+		// arcTo
+		{
+			fn: func(d *Draw) {
+				chart.Style{
+					StrokeWidth: 1,
+					StrokeColor: drawing.ColorBlack,
+					FillColor:   drawing.ColorBlue,
+				}.WriteToRenderer(d.Render)
+				d.arcTo(100, 100, 100, 100, 0, math.Pi/2)
+				d.Render.Close()
+				d.Render.FillStroke()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"400\" height=\"300\">\\n<path  d=\"M 205 110\nA 100 100 90.00 0 1 105 210\nZ\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:rgba(0,0,255,1.0)\"/></svg>",
+		},
 	}
 	for _, tt := range tests {
 		d, err := NewDraw(DrawOption{
@@ -237,6 +253,7 @@ func TestDraw(t *testing.T) {
 		tt.fn(d)
 		data, err := d.Bytes()
 		assert.Nil(err)
+		fmt.Println(string(data))
 		assert.Equal(tt.result, string(data))
 	}
 }

legend_test.go

@@ -133,6 +133,27 @@ func TestLegendRender(t *testing.T) {
 				Bottom: 70,
 			},
 		},
+		{
+			newDraw: newDraw,
+			newLegend: func(d *Draw) *legend {
+				return NewLegend(d, LegendOption{
+					Top:  "10",
+					Left: "10%",
+					Data: []string{
+						"Mon",
+						"Tue",
+						"Wed",
+					},
+					Style:  style,
+					Orient: OrientVertical,
+				})
+			},
+			box: chart.Box{
+				Right:  101,
+				Bottom: 70,
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"400\" height=\"300\">\\n<path  d=\"M 40 10\nL 70 10\" style=\"stroke-width:3;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/><circle cx=\"55\" cy=\"10\" r=\"5\" style=\"stroke-width:3;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/><path  d=\"\" style=\"stroke-width:3;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/><text x=\"75\" y=\"13\" style=\"stroke-width:0;stroke:none;fill:rgba(0,0,0,1.0);font-size:12.8px;font-family:'Roboto Medium',sans-serif\">Mon</text><path  d=\"M 40 30\nL 70 30\" style=\"stroke-width:3;stroke:rgba(145,204,117,1.0);fill:rgba(145,204,117,1.0)\"/><circle cx=\"55\" cy=\"30\" r=\"5\" style=\"stroke-width:3;stroke:rgba(145,204,117,1.0);fill:rgba(145,204,117,1.0)\"/><path  d=\"\" style=\"stroke-width:3;stroke:rgba(145,204,117,1.0);fill:rgba(145,204,117,1.0)\"/><text x=\"75\" y=\"33\" style=\"stroke-width:0;stroke:none;fill:rgba(0,0,0,1.0);font-size:12.8px;font-family:'Roboto Medium',sans-serif\">Tue</text><path  d=\"M 40 50\nL 70 50\" style=\"stroke-width:3;stroke:rgba(250,200,88,1.0);fill:rgba(250,200,88,1.0)\"/><circle cx=\"55\" cy=\"50\" r=\"5\" style=\"stroke-width:3;stroke:rgba(250,200,88,1.0);fill:rgba(250,200,88,1.0)\"/><path  d=\"\" style=\"stroke-width:3;stroke:rgba(250,200,88,1.0);fill:rgba(250,200,88,1.0)\"/><text x=\"75\" y=\"53\" style=\"stroke-width:0;stroke:none;fill:rgba(0,0,0,1.0);font-size:12.8px;font-family:'Roboto Medium',sans-serif\">Wed</text></svg>",
+		},
 	}
 
 	for _, tt := range tests {