add colors, move legend (#18)

Author: myshkins

tsplot/color_palettes.go

@@ -10,15 +10,21 @@ var usedColors = make(map[string]color.RGBA)
 
 // simple colors (subset of golang.org/x/image/colornames)
 var availableColors = map[string]color.RGBA{
-	"blue":    color.RGBA{0x00, 0x00, 0xff, 0xff}, // rgb(0, 0, 255)
-	"brown":   color.RGBA{0xa5, 0x2a, 0x2a, 0xff}, // rgb(165, 42, 42)
-	"orange":  color.RGBA{0xff, 0xa5, 0x00, 0xff}, // rgb(255, 165, 0)
-	"hotpink": color.RGBA{0xff, 0x69, 0xb4, 0xff}, // rgb(255, 105, 180)
-	"red":     color.RGBA{0xff, 0x00, 0x00, 0xff}, // rgb(255, 0, 0)
-	"purple":  color.RGBA{0x80, 0x00, 0x80, 0xff}, // rgb(128, 0, 128)
-	"yellow":  color.RGBA{0xff, 0xff, 0x00, 0xff}, // rgb(255, 255, 0)
-	"green":   color.RGBA{0x00, 0x80, 0x00, 0xff}, // rgb(0, 128, 0)
-
+	"aqua":            color.RGBA{0x00, 0xff, 0xff, 0xff}, //(rgb: 0, 255, 255),
+	"brown":           color.RGBA{0xa5, 0x2a, 0x2a, 0xff}, // rgb(165, 42, 42)
+	"darkkhaki":       color.RGBA{0xbd, 0xb7, 0x6b, 0xff}, // rgb(189, 183, 107)
+	"deepskyblue":     color.RGBA{0x00, 0xbf, 0xff, 0xff}, //(rgb: 0, 191, 255),
+	"gold":            color.RGBA{0xff, 0xd7, 0x00, 0xff}, //(rgb: 255, 215, 0),
+	"gray":            color.RGBA{0x80, 0x80, 0x80, 0xff}, // rgb(128, 128, 128)
+	"green":           color.RGBA{0x00, 0x80, 0x00, 0xff}, //(rgb: 0, 128, 0),
+	"lime":            color.RGBA{0x00, 0xff, 0x00, 0xff}, //(rgb: 0, 255, 0),
+	"magenta":         color.RGBA{0xff, 0x00, 0xff, 0xff}, //(rgb: 255, 0, 255),
+	"mediumturquoise": color.RGBA{0x48, 0xd1, 0xcc, 0xff}, // rgb(72, 209, 204)
+	"orange":          color.RGBA{0xff, 0xa5, 0x00, 0xff}, //(rgb: 255, 165, 0),
+	"purple":          color.RGBA{0x80, 0x00, 0x80, 0xff}, // rgb(128, 0, 128)
+	"red":             color.RGBA{0xff, 0x00, 0x00, 0xff}, //(rgb: 255, 0, 0),
+	"royalblue":       color.RGBA{0x41, 0x69, 0xe1, 0xff}, // rgb(65, 105, 225)
+	"violet":          color.RGBA{0xee, 0x82, 0xee, 0xff}, //(rgb: 238, 130, 238),
 }
 
 func getUnusedColor() color.RGBA {
@@ -31,6 +37,10 @@ func getUnusedColor() color.RGBA {
 	return colornames.Black
 }
 
+func resetUsedColors() {
+	usedColors = make(map[string]color.RGBA)
+}
+
 type ColorPalette struct {
 	Foreground color.Color
 	Background color.Color

tsplot/plot.go

@@ -70,7 +70,7 @@ func NewPlotFromTimeSeries(ts *monitoringpb.TimeSeries, opts ...PlotOption) (*pl
 		opt(p)
 	}
 
-	p.Y.Max = YMax + 200
+	p.Y.Max = YMax + (.1 * YMax)
 	return p, nil
 }
 
@@ -107,17 +107,20 @@ func NewPlotFromTimeSeriesIterator(tsi *monitoring.TimeSeriesIterator, legendKey
 			legendEntry, _ := plotter.NewPolygon()
 			legendEntry.Color = lineColor
 			p.Legend.Left = true
+			p.Legend.Top = true
 			p.Legend.Add(timeSeries.GetMetric().GetLabels()[legendKey], legendEntry)
 		}
 	}
 
 	// set Y Axis scale
-	p.Y.Max = yMax + 200
+	p.Y.Max = yMax + (.1 * yMax)
 
 	for _, opt := range opts {
 		opt(p)
 	}
 
+	resetUsedColors()
+
 	return p, nil
 }