Merge branch 'master' of github.com:wcharczuk/go-chart

_examples/basic/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"log"
 	"net/http"
 
 	"github.com/wcharczuk/go-chart"
@@ -38,5 +39,5 @@ func drawChartWide(res http.ResponseWriter, req *http.Request) {
 func main() {
 	http.HandleFunc("/", drawChart)
 	http.HandleFunc("/wide", drawChartWide)
-	http.ListenAndServe(":8080", nil)
+	log.Fatal(http.ListenAndServe(":8080", nil))
 }

annotation_series_test.go

@@ -55,7 +55,7 @@ func TestAnnotationSeriesMeasure(t *testing.T) {
 	assert.False(box.IsZero())
 	assert.Equal(-5.0, box.Top)
 	assert.Equal(5.0, box.Left)
-	assert.Equal(147.0, box.Right) //the top,left annotation sticks up 5px and out ~44px.
+	assert.Equal(146.0, box.Right) //the top,left annotation sticks up 5px and out ~44px.
 	assert.Equal(115.0, box.Bottom)
 }
 

chart.go

@@ -97,6 +97,8 @@ func (c Chart) Render(rp RendererProvider, w io.Writer) error {
 
 	err = c.checkRanges(xr, yr, yra)
 	if err != nil {
+		// (try to) dump the raw background to the stream.
+		r.Save(w)
 		return err
 	}
 
@@ -461,7 +463,7 @@ func (c Chart) styleDefaultsBackground() Style {
 	return Style{
 		FillColor:   DefaultBackgroundColor,
 		StrokeColor: DefaultBackgroundStrokeColor,
-		StrokeWidth: DefaultStrokeWidth,
+		StrokeWidth: DefaultBackgroundStrokeWidth,
 	}
 }
 
@@ -469,7 +471,7 @@ func (c Chart) styleDefaultsCanvas() Style {
 	return Style{
 		FillColor:   DefaultCanvasColor,
 		StrokeColor: DefaultCanvasStrokeColor,
-		StrokeWidth: DefaultStrokeWidth,
+		StrokeWidth: DefaultCanvasStrokeWidth,
 	}
 }
 
@@ -477,7 +479,7 @@ func (c Chart) styleDefaultsSeries(seriesIndex int) Style {
 	strokeColor := GetDefaultColor(seriesIndex)
 	return Style{
 		StrokeColor: strokeColor,
-		StrokeWidth: DefaultStrokeWidth,
+		StrokeWidth: DefaultSeriesLineWidth,
 		Font:        c.GetFont(),
 		FontSize:    DefaultFontSize,
 	}

defaults.go

@@ -12,8 +12,10 @@ const (
 	DefaultChartHeight = 400
 	// DefaultChartWidth is the default chart width.
 	DefaultChartWidth = 1024
-	// DefaultStrokeWidth is the default chart line/stroke width.
+	// DefaultStrokeWidth is the default chart stroke width.
-	DefaultStrokeWidth = 1.0
+	DefaultStrokeWidth = 0.0
+	// DefaultSeriesLineWidth is the default line width.
+	DefaultSeriesLineWidth = 1.0
 	// DefaultAxisLineWidth is the line width of the axis lines.
 	DefaultAxisLineWidth = 1.0
 	//DefaultDPI is the default dots per inch for the chart.
@@ -33,6 +35,11 @@ const (
 	// DefaultTitleTop is the default distance from the top of the chart to put the title.
 	DefaultTitleTop = 10
 
+	// DefaultBackgroundStrokeWidth is the default stroke on the chart background.
+	DefaultBackgroundStrokeWidth = 0.0
+	// DefaultCanvasStrokeWidth is the default stroke on the chart canvas.
+	DefaultCanvasStrokeWidth = 0.0
+
 	// DefaultLineSpacing is the default vertical distance between lines of text.
 	DefaultLineSpacing = 5
 
@@ -103,6 +110,9 @@ var (
 	ColorAlternateYellow = drawing.Color{R: 240, G: 174, B: 90, A: 255}
 	// ColorAlternateLightGray is a alternate theme color.
 	ColorAlternateLightGray = drawing.Color{R: 187, G: 190, B: 191, A: 255}
+
+	// ColorTransparent is a transparent (alpha zero) color.
+	ColorTransparent = drawing.Color{R: 1, G: 1, B: 1, A: 0}
 )
 
 var (
@@ -171,6 +181,11 @@ var (
 	DashArrayDashesLarge = []int{10, 10}
 )
 
+// NewColor returns a new color.
+func NewColor(r, g, b, a uint8) drawing.Color {
+	return drawing.Color{R: r, G: g, B: b, A: a}
+}
+
 // GetDefaultColor returns a color from the default list by index.
 // NOTE: the index will wrap around (using a modulo).
 func GetDefaultColor(index int) drawing.Color {

file_util.go

@@ -4,8 +4,6 @@ import (
 	"bufio"
 	"io"
 	"os"
-
-	exception "github.com/blendlabs/go-exception"
 )
 
 var (
@@ -26,7 +24,7 @@ func (fu fileUtil) ReadByLines(filePath string, handler func(line string)) error
 			handler(line)
 		}
 	} else {
-		return exception.Wrap(err)
+		return err
 	}
 	return nil
 }
@@ -46,7 +44,7 @@ func (fu fileUtil) ReadByChunks(filePath string, chunkSize int, handler func(lin
 			handler(readData)
 		}
 	} else {
-		return exception.Wrap(err)
+		return err
 	}
 	return nil
 }