Respond to comments

plotter/heat_test.go

@@ -49,8 +49,8 @@ func ExampleHeatMap() {
 			5, 6, 7, 8,
 			9, 10, 11, 12,
 		})}
-	plte := palette.Heat(12, 1)
-	h := NewHeatMap(m, plte)
+	pal := palette.Heat(12, 1)
+	h := NewHeatMap(m, pal)
 
 	p, err := plot.New()
 	if err != nil {
@@ -62,7 +62,7 @@ func ExampleHeatMap() {
 
 	// Create a legend.
 	rng := h.Max - h.Min
-	thumbs := PaletteThumbnailers(plte)
+	thumbs := PaletteThumbnailers(pal)
 	for i := len(thumbs) - 1; i >= 0; i-- {
 		t := thumbs[i]
 		fmin := float64(i) / float64(len(thumbs))
@@ -75,7 +75,7 @@ func ExampleHeatMap() {
 	p.X.Max = 1.5
 	p.Y.Max = 1.5
 
-	err = p.Save(100, 100, "testdata/heatMap.png")
+	err = p.Save(250, 200, "testdata/heatMap.png")
 	if err != nil {
 		log.Panic(err)
 	}

plotter/palettethumbnailer.go

@@ -13,7 +13,7 @@ import (
 	"github.com/gonum/plot/vg/draw"
 )
 
-// PaletteThumbnailers creates a group of objects that can be used to
+// PaletteThumbnailers creates a slice of plot.Thumbnailers that can be used to
 // add legend entries for the colors in a color palette.
 func PaletteThumbnailers(p palette.Palette) []plot.Thumbnailer {
 	colors := p.Colors()
@@ -30,16 +30,8 @@ type paletteThumbnailer struct {
 	color color.Color
 }
 
-// Thumbnail fulfills the plot.Thumbnailer interface.
+// Thumbnail satisfies the plot.Thumbnailer interface.
 func (t paletteThumbnailer) Thumbnail(c *draw.Canvas) {
-	lineStyle := draw.LineStyle{
-		Color:    color.Black,
-		Width:    vg.Points(1),
-		Dashes:   []vg.Length{},
-		DashOffs: 0,
-	}
-
-	// Here we draw the fill.
 	pts := []vg.Point{
 		{X: c.Min.X, Y: c.Min.Y},
 		{X: c.Min.X, Y: c.Max.Y},
@@ -48,20 +40,4 @@ func (t paletteThumbnailer) Thumbnail(c *draw.Canvas) {
 	}
 	poly := c.ClipPolygonY(pts)
 	c.FillPolygon(t.color, poly)
-
-	// Here we draw the upper border.
-	pts = []vg.Point{
-		{X: c.Min.X, Y: c.Max.Y},
-		{X: c.Max.X, Y: c.Max.Y},
-	}
-	outline := c.ClipLinesY(pts)
-	c.StrokeLines(lineStyle, outline...)
-
-	// Here we draw the lower border.
-	pts = []vg.Point{
-		{X: c.Min.X, Y: c.Min.Y},
-		{X: c.Max.X, Y: c.Min.Y},
-	}
-	outline = c.ClipLinesY(pts)
-	c.StrokeLines(lineStyle, outline...)
 }