unification of sample and test coding styles will improve visibility (#67)

* "Style{Show: true}" to "StyleShow()"
* "Box{IsSet: true}" to "BoxZero"

_examples/axes/main.go

@@ -15,14 +15,10 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 
 	graph := chart.Chart{
 		XAxis: chart.XAxis{
-			Style: chart.Style{
+			Style: chart.StyleShow(), //enables / displays the x-axis
-				Show: true, //enables / displays the x-axis
-			},
 		},
 		YAxis: chart.YAxis{
-			Style: chart.Style{
+			Style: chart.StyleShow(), //enables / displays the y-axis
-				Show: true, //enables / displays the y-axis
-			},
 		},
 		Series: []chart.Series{
 			chart.ContinuousSeries{

_examples/bar_chart/main.go

@@ -20,13 +20,9 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		},
 		Height:   512,
 		BarWidth: 60,
-		XAxis: chart.Style{
+		XAxis:    chart.StyleShow(),
-			Show: true,
-		},
 		YAxis: chart.YAxis{
-			Style: chart.Style{
+			Style: chart.StyleShow(),
-				Show: true,
-			},
 		},
 		Bars: []chart.Value{
 			{Value: 5.25, Label: "Blue"},

_examples/custom_formatters/main.go

@@ -16,9 +16,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 
 	graph := chart.Chart{
 		YAxis: chart.YAxis{
-			Style: chart.Style{
+			Style: chart.StyleShow(),
-				Show: true,
-			},
 			ValueFormatter: func(v interface{}) string {
 				if vf, isFloat := v.(float64); isFloat {
 					return fmt.Sprintf("%0.6f", vf)

_examples/custom_padding/main.go

@@ -20,14 +20,10 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 			FillColor: drawing.ColorFromHex("efefef"),
 		},
 		XAxis: chart.XAxis{
-			Style: chart.Style{
+			Style: chart.StyleShow(),
-				Show: true,
-			},
 		},
 		YAxis: chart.YAxis{
-			Style: chart.Style{
+			Style: chart.StyleShow(),
-				Show: true,
-			},
 		},
 		Series: []chart.Series{
 			chart.ContinuousSeries{
@@ -47,14 +43,10 @@ func drawChartDefault(res http.ResponseWriter, req *http.Request) {
 			FillColor: drawing.ColorFromHex("efefef"),
 		},
 		XAxis: chart.XAxis{
-			Style: chart.Style{
+			Style: chart.StyleShow(),
-				Show: true,
-			},
 		},
 		YAxis: chart.YAxis{
-			Style: chart.Style{
+			Style: chart.StyleShow(),
-				Show: true,
-			},
 		},
 		Series: []chart.Series{
 			chart.ContinuousSeries{

_examples/custom_ranges/main.go

@@ -14,9 +14,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 
 	graph := chart.Chart{
 		YAxis: chart.YAxis{
-			Style: chart.Style{
+			Style: chart.StyleShow(),
-				Show: true,
-			},
 			Range: &chart.ContinuousRange{
 				Min: 0.0,
 				Max: 10.0,

_examples/custom_ticks/main.go

@@ -14,9 +14,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 
 	graph := chart.Chart{
 		YAxis: chart.YAxis{
-			Style: chart.Style{
+			Style: chart.StyleShow(),
-				Show: true,
-			},
 			Range: &chart.ContinuousRange{
 				Min: 0.0,
 				Max: 4.0,

_examples/descending/main.go

@@ -20,17 +20,13 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		Height: 500,
 		Width:  500,
 		XAxis: chart.XAxis{
-			Style: chart.Style{
+			Style: chart.StyleShow(),
-				Show: true,
-			},
 			/*Range: &chart.ContinuousRange{
 				Descending: true,
 			},*/
 		},
 		YAxis: chart.YAxis{
-			Style: chart.Style{
+			Style: chart.StyleShow(),
-				Show: true,
-			},
 			Range: &chart.ContinuousRange{
 				Descending: true,
 			},

_examples/legend/main.go

@@ -16,10 +16,10 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 
 	graph := chart.Chart{
 		XAxis: chart.XAxis{
-			Style: chart.Style{Show: true},
+			Style: chart.StyleShow(),
 		},
 		YAxis: chart.YAxis{
-			Style: chart.Style{Show: true},
+			Style: chart.StyleShow(),
 		},
 		Background: chart.Style{
 			Padding: chart.Box{

_examples/legend_left/main.go

@@ -16,10 +16,10 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 
 	graph := chart.Chart{
 		XAxis: chart.XAxis{
-			Style: chart.Style{Show: true},
+			Style: chart.StyleShow(),
 		},
 		YAxis: chart.YAxis{
-			Style: chart.Style{Show: true},
+			Style: chart.StyleShow(),
 		},
 		Background: chart.Style{
 			Padding: chart.Box{

_examples/request_timings/main.go

@@ -105,9 +105,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 			},
 		},
 		XAxis: chart.XAxis{
-			Style: chart.Style{
+			Style:          chart.StyleShow(),
-				Show: true,
-			},
 			ValueFormatter: chart.TimeHourValueFormatter,
 			GridMajorStyle: chart.Style{
 				Show:        true,

_examples/scatter/main.go

@@ -44,10 +44,10 @@ func unit(res http.ResponseWriter, req *http.Request) {
 		Height: 50,
 		Width:  50,
 		Canvas: chart.Style{
-			Padding: chart.Box{IsSet: true},
+			Padding: chart.BoxZero,
 		},
 		Background: chart.Style{
-			Padding: chart.Box{IsSet: true},
+			Padding: chart.BoxZero,
 		},
 		Series: []chart.Series{
 			chart.ContinuousSeries{

_examples/stacked_bar/main.go

@@ -18,12 +18,8 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 			},
 		},
 		Height: 512,
-		XAxis: chart.Style{
+		XAxis:  chart.StyleShow(),
-			Show: true,
+		YAxis:  chart.StyleShow(),
-		},
-		YAxis: chart.Style{
-			Show: true,
-		},
 		Bars: []chart.StackedBar{
 			{
 				Name: "This is a very long string to test word break wrapping.",

_examples/stock_analysis/main.go

@@ -43,11 +43,11 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 
 	graph := chart.Chart{
 		XAxis: chart.XAxis{
-			Style:        chart.Style{Show: true},
+			Style:        chart.StyleShow(),
 			TickPosition: chart.TickPositionBetweenTicks,
 		},
 		YAxis: chart.YAxis{
-			Style: chart.Style{Show: true},
+			Style: chart.StyleShow(),
 			Range: &chart.ContinuousRange{
 				Max: 220.0,
 				Min: 180.0,

_examples/timeseries/main.go

@@ -14,9 +14,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 	*/
 	graph := chart.Chart{
 		XAxis: chart.XAxis{
-			Style: chart.Style{
+			Style: chart.StyleShow(),
-				Show: true,
-			},
 		},
 		Series: []chart.Series{
 			chart.TimeSeries{
@@ -48,9 +46,7 @@ func drawCustomChart(res http.ResponseWriter, req *http.Request) {
 	*/
 	graph := chart.Chart{
 		XAxis: chart.XAxis{
-			Style: chart.Style{
+			Style:          chart.StyleShow(),
-				Show: true,
-			},
 			ValueFormatter: chart.TimeHourValueFormatter,
 		},
 		Series: []chart.Series{

_examples/twoaxis/main.go

@@ -18,9 +18,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 
 	graph := chart.Chart{
 		XAxis: chart.XAxis{
-			Style: chart.Style{
+			Style:        chart.StyleShow(), //enables / displays the x-axis
-				Show: true, //enables / displays the x-axis
-			},
 			TickPosition: chart.TickPositionBetweenTicks,
 			ValueFormatter: func(v interface{}) string {
 				typed := v.(float64)
@@ -29,14 +27,10 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 			},
 		},
 		YAxis: chart.YAxis{
-			Style: chart.Style{
+			Style: chart.StyleShow(), //enables / displays the y-axis
-				Show: true, //enables / displays the y-axis
-			},
 		},
 		YAxisSecondary: chart.YAxis{
-			Style: chart.Style{
+			Style: chart.StyleShow(), //enables / displays the secondary y-axis
-				Show: true, //enables / displays the secondary y-axis
-			},
 		},
 		Series: []chart.Series{
 			chart.ContinuousSeries{

_examples/twopoint/main.go

@@ -14,10 +14,8 @@ func main() {
 	b = 1000
 
 	ts1 := chart.ContinuousSeries{ //TimeSeries{
-		Name: "Time Series",
+		Name:    "Time Series",
-		Style: chart.Style{
+		Style:   chart.StyleShow(),
-			Show: true,
-		},
 		XValues: []float64{10 * b, 20 * b, 30 * b, 40 * b, 50 * b, 60 * b, 70 * b, 80 * b},
 		YValues: []float64{1.0, 2.0, 30.0, 4.0, 50.0, 6.0, 7.0, 88.0},
 	}

annotation_series_test.go

@@ -5,6 +5,7 @@ import (
 	"testing"
 
 	"github.com/blend/go-sdk/assert"
+
 	"github.com/wcharczuk/go-chart/drawing"
 )
 
@@ -12,9 +13,7 @@ func TestAnnotationSeriesMeasure(t *testing.T) {
 	assert := assert.New(t)
 
 	as := AnnotationSeries{
-		Style: Style{
+		Style: StyleShow(),
-			Show: true,
-		},
 		Annotations: []Value2{
 			{XValue: 1.0, YValue: 1.0, Label: "1.0"},
 			{XValue: 2.0, YValue: 2.0, Label: "2.0"},

chart_test.go

@@ -8,7 +8,9 @@ import (
 	"testing"
 	"time"
 
+
 	"github.com/blend/go-sdk/assert"
+
 	"github.com/wcharczuk/go-chart/drawing"
 	"github.com/wcharczuk/go-chart/seq"
 )
@@ -278,27 +280,21 @@ func TestChartHasAxes(t *testing.T) {
 
 	x := Chart{
 		XAxis: XAxis{
-			Style: Style{
+			Style: StyleShow(),
-				Show: true,
-			},
 		},
 	}
 	assert.True(x.hasAxes())
 
 	y := Chart{
 		YAxis: YAxis{
-			Style: Style{
+			Style: StyleShow(),
-				Show: true,
-			},
 		},
 	}
 	assert.True(y.hasAxes())
 
 	ya := Chart{
 		YAxisSecondary: YAxis{
-			Style: Style{
+			Style: StyleShow(),
-				Show: true,
-			},
 		},
 	}
 	assert.True(ya.hasAxes())
@@ -312,15 +308,15 @@ func TestChartGetAxesTicks(t *testing.T) {
 
 	c := Chart{
 		XAxis: XAxis{
-			Style: Style{Show: true},
+			Style: StyleShow(),
 			Range: &ContinuousRange{Min: 9.8, Max: 19.8},
 		},
 		YAxis: YAxis{
-			Style: Style{Show: true},
+			Style: StyleShow(),
 			Range: &ContinuousRange{Min: 9.9, Max: 19.9},
 		},
 		YAxisSecondary: YAxis{
-			Style: Style{Show: true},
+			Style: StyleShow(),
 			Range: &ContinuousRange{Min: 9.7, Max: 19.7},
 		},
 	}
@@ -482,10 +478,10 @@ func TestChartE2ELine(t *testing.T) {
 		Height: 50,
 		Width:  50,
 		Canvas: Style{
-			Padding: Box{IsSet: true},
+			Padding: BoxZero,
 		},
 		Background: Style{
-			Padding: Box{IsSet: true},
+			Padding: BoxZero,
 		},
 		Series: []Series{
 			ContinuousSeries{
@@ -522,10 +518,10 @@ func TestChartE2ELineWithFill(t *testing.T) {
 		Height: 50,
 		Width:  50,
 		Canvas: Style{
-			Padding: Box{IsSet: true},
+			Padding: BoxZero,
 		},
 		Background: Style{
-			Padding: Box{IsSet: true},
+			Padding: BoxZero,
 		},
 		Series: []Series{
 			ContinuousSeries{