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// Copyright ©2015 The Gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package plotutil contains a small number of utilites for creating plots.
//
// This package is under active development so portions of it may change.
package plotutil // import "gonum.org/v1/plot/plotutil"
import (
"image/color"
"gonum.org/v1/plot/vg"
"gonum.org/v1/plot/vg/draw"
)
// DefaultColors is a set of colors used by the Color function.
var DefaultColors = SoftColors
var DarkColors = []color.Color{
rgb(238, 46, 47),
rgb(0, 140, 72),
rgb(24, 90, 169),
rgb(244, 125, 35),
rgb(102, 44, 145),
rgb(162, 29, 33),
rgb(180, 56, 148),
}
var SoftColors = []color.Color{
rgb(241, 90, 96),
rgb(122, 195, 106),
rgb(90, 155, 212),
rgb(250, 167, 91),
rgb(158, 103, 171),
rgb(206, 112, 88),
rgb(215, 127, 180),
}
func rgb(r, g, b uint8) color.RGBA {
return color.RGBA{r, g, b, 255}
}
// Color returns the ith default color, wrapping
// if i is less than zero or greater than the max
// number of colors in the DefaultColors slice.
func Color(i int) color.Color {
n := len(DefaultColors)
if i < 0 {
return DefaultColors[i%n+n]
}
return DefaultColors[i%n]
}
// DefaultGlyphShapes is a set of GlyphDrawers used by
// the Shape function.
var DefaultGlyphShapes = []draw.GlyphDrawer{
draw.RingGlyph{},
draw.SquareGlyph{},
draw.TriangleGlyph{},
draw.CrossGlyph{},
draw.PlusGlyph{},
draw.CircleGlyph{},
draw.BoxGlyph{},
draw.PyramidGlyph{},
}
// Shape returns the ith default glyph shape,
// wrapping if i is less than zero or greater
// than the max number of GlyphDrawers
// in the DefaultGlyphShapes slice.
func Shape(i int) draw.GlyphDrawer {
n := len(DefaultGlyphShapes)
if i < 0 {
return DefaultGlyphShapes[i%n+n]
}
return DefaultGlyphShapes[i%n]
}
// DefaultDashes is a set of dash patterns used by
// the Dashes function.
var DefaultDashes = [][]vg.Length{
{},
{vg.Points(6), vg.Points(2)},
{vg.Points(2), vg.Points(2)},
{vg.Points(1), vg.Points(1)},
{vg.Points(5), vg.Points(2), vg.Points(1), vg.Points(2)},
{vg.Points(10), vg.Points(2), vg.Points(2), vg.Points(2),
vg.Points(2), vg.Points(2), vg.Points(2), vg.Points(2)},
{vg.Points(10), vg.Points(2), vg.Points(2), vg.Points(2)},
{vg.Points(5), vg.Points(2), vg.Points(5), vg.Points(2),
vg.Points(2), vg.Points(2), vg.Points(2), vg.Points(2)},
{vg.Points(4), vg.Points(2), vg.Points(4), vg.Points(1),
vg.Points(1), vg.Points(1), vg.Points(1), vg.Points(1),
vg.Points(1), vg.Points(1)},
}
// Dashes returns the ith default dash pattern,
// wrapping if i is less than zero or greater
// than the max number of dash patters
// in the DefaultDashes slice.
func Dashes(i int) []vg.Length {
n := len(DefaultDashes)
if i < 0 {
return DefaultDashes[i%n+n]
}
return DefaultDashes[i%n]
}
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