palette_test.go

Documentation: gonum.org/v1/plot/palette

     1  // Copyright ©2015 The Gonum Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // Copyright ©2011-2012 The bíogo Authors. All rights reserved.
     6  // Use of this source code is governed by a BSD-style
     7  // license that can be found in the LICENSE file.
     8  
     9  package palette
    10  
    11  import (
    12  	"image/color"
    13  	"reflect"
    14  	"testing"
    15  )
    16  
    17  func TestRainbow(t *testing.T) {
    18  	if !reflect.DeepEqual(Rainbow(10, 0, 1, 1, 1, 1), palette{
    19  		color.NRGBA{R: 0xff, G: 0x00, B: 0x00, A: 0xff}, // "#FF0000FF"
    20  		color.NRGBA{R: 0xff, G: 0xaa, B: 0x00, A: 0xff}, // "#FFAA00FF"
    21  		color.NRGBA{R: 0xaa, G: 0xff, B: 0x00, A: 0xff}, // "#AAFF00FF"
    22  		color.NRGBA{R: 0x00, G: 0xff, B: 0x00, A: 0xff}, // "#00FF00FF"
    23  		color.NRGBA{R: 0x00, G: 0xff, B: 0xaa, A: 0xff}, // "#00FFAAFF"
    24  		color.NRGBA{R: 0x00, G: 0xaa, B: 0xff, A: 0xff}, // "#00AAFFFF"
    25  		color.NRGBA{R: 0x00, G: 0x00, B: 0xff, A: 0xff}, // "#0000FFFF"
    26  		color.NRGBA{R: 0xaa, G: 0x00, B: 0xff, A: 0xff}, // "#AA00FFFF"
    27  		color.NRGBA{R: 0xff, G: 0x00, B: 0xaa, A: 0xff}, // "#FF00AAFF"
    28  		color.NRGBA{R: 0xff, G: 0x00, B: 0x00, A: 0xff}, // "#FF0000FF"
    29  	}) {
    30  		t.Error("Rainbow does not agree with R rainbow")
    31  	}
    32  }
    33  
    34  func TestHeat(t *testing.T) {
    35  	if !reflect.DeepEqual(Heat(10, 1), palette{
    36  		color.NRGBA{R: 0xff, G: 0x00, B: 0x00, A: 0xff}, // "#FF0000FF"
    37  		color.NRGBA{R: 0xff, G: 0x24, B: 0x00, A: 0xff}, // "#FF2400FF"
    38  		color.NRGBA{R: 0xff, G: 0x49, B: 0x00, A: 0xff}, // "#FF4900FF"
    39  		color.NRGBA{R: 0xff, G: 0x6d, B: 0x00, A: 0xff}, // "#FF6D00FF"
    40  		color.NRGBA{R: 0xff, G: 0x92, B: 0x00, A: 0xff}, // "#FF9200FF"
    41  		color.NRGBA{R: 0xff, G: 0xb6, B: 0x00, A: 0xff}, // "#FFB600FF"
    42  		color.NRGBA{R: 0xff, G: 0xdb, B: 0x00, A: 0xff}, // "#FFDB00FF"
    43  		color.NRGBA{R: 0xff, G: 0xff, B: 0x00, A: 0xff}, // "#FFFF00FF"
    44  		color.NRGBA{R: 0xff, G: 0xff, B: 0x3f, A: 0xff}, // "#FFFF40FF" Off by one compared to R.
    45  		color.NRGBA{R: 0xff, G: 0xff, B: 0xbF, A: 0xff}, // "#FFFFBFFF"
    46  	}) {
    47  		t.Error("Heat does not agree with R heat.colors (ish)")
    48  	}
    49  }
    50  
    51  func TestRadial(t *testing.T) {
    52  	rad := Radial(10, Cyan, Magenta, 1)
    53  	if !reflect.DeepEqual(rad, divergingPalette{
    54  		color.NRGBA{R: 0x7f, G: 0xff, B: 0xff, A: 0xff}, // "#80FFFFFF" Off by one compared to R.
    55  		color.NRGBA{R: 0x99, G: 0xff, B: 0xff, A: 0xff}, // "#99FFFFFF"
    56  		color.NRGBA{R: 0xb3, G: 0xff, B: 0xff, A: 0xff}, // "#B3FFFFFF"
    57  		color.NRGBA{R: 0xcc, G: 0xff, B: 0xff, A: 0xff}, // "#CCFFFFFF"
    58  		color.NRGBA{R: 0xe6, G: 0xff, B: 0xff, A: 0xff}, // "#E6FFFFFF" - middle low
    59  		color.NRGBA{R: 0xff, G: 0xe6, B: 0xff, A: 0xff}, // "#FFE6FFFF" - middle high
    60  		color.NRGBA{R: 0xff, G: 0xcc, B: 0xff, A: 0xff}, // "#FFCCFFFF"
    61  		color.NRGBA{R: 0xff, G: 0xb3, B: 0xff, A: 0xff}, // "#FFB3FFFF"
    62  		color.NRGBA{R: 0xff, G: 0x99, B: 0xff, A: 0xff}, // "#FF99FFFF"
    63  		color.NRGBA{R: 0xff, G: 0x7f, B: 0xff, A: 0xff}, // "#FF80FFFF" Off by one compared to R.
    64  	}) {
    65  		t.Error("Radial does not agree with R cm.colors (ish)")
    66  	}
    67  	if l, h := rad.CriticalIndex(); l != 4 || h != 5 {
    68  		t.Errorf("Radial(10...) gives unexpected critical index values: %d and %d", l, h)
    69  	}
    70  }
    71
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