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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.
// Copyright ©2011-2012 The bíogo 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 palette
import (
"image/color"
"reflect"
"testing"
)
func TestRainbow(t *testing.T) {
if !reflect.DeepEqual(Rainbow(10, 0, 1, 1, 1, 1), palette{
color.NRGBA{R: 0xff, G: 0x00, B: 0x00, A: 0xff}, // "#FF0000FF"
color.NRGBA{R: 0xff, G: 0xaa, B: 0x00, A: 0xff}, // "#FFAA00FF"
color.NRGBA{R: 0xaa, G: 0xff, B: 0x00, A: 0xff}, // "#AAFF00FF"
color.NRGBA{R: 0x00, G: 0xff, B: 0x00, A: 0xff}, // "#00FF00FF"
color.NRGBA{R: 0x00, G: 0xff, B: 0xaa, A: 0xff}, // "#00FFAAFF"
color.NRGBA{R: 0x00, G: 0xaa, B: 0xff, A: 0xff}, // "#00AAFFFF"
color.NRGBA{R: 0x00, G: 0x00, B: 0xff, A: 0xff}, // "#0000FFFF"
color.NRGBA{R: 0xaa, G: 0x00, B: 0xff, A: 0xff}, // "#AA00FFFF"
color.NRGBA{R: 0xff, G: 0x00, B: 0xaa, A: 0xff}, // "#FF00AAFF"
color.NRGBA{R: 0xff, G: 0x00, B: 0x00, A: 0xff}, // "#FF0000FF"
}) {
t.Error("Rainbow does not agree with R rainbow")
}
}
func TestHeat(t *testing.T) {
if !reflect.DeepEqual(Heat(10, 1), palette{
color.NRGBA{R: 0xff, G: 0x00, B: 0x00, A: 0xff}, // "#FF0000FF"
color.NRGBA{R: 0xff, G: 0x24, B: 0x00, A: 0xff}, // "#FF2400FF"
color.NRGBA{R: 0xff, G: 0x49, B: 0x00, A: 0xff}, // "#FF4900FF"
color.NRGBA{R: 0xff, G: 0x6d, B: 0x00, A: 0xff}, // "#FF6D00FF"
color.NRGBA{R: 0xff, G: 0x92, B: 0x00, A: 0xff}, // "#FF9200FF"
color.NRGBA{R: 0xff, G: 0xb6, B: 0x00, A: 0xff}, // "#FFB600FF"
color.NRGBA{R: 0xff, G: 0xdb, B: 0x00, A: 0xff}, // "#FFDB00FF"
color.NRGBA{R: 0xff, G: 0xff, B: 0x00, A: 0xff}, // "#FFFF00FF"
color.NRGBA{R: 0xff, G: 0xff, B: 0x3f, A: 0xff}, // "#FFFF40FF" Off by one compared to R.
color.NRGBA{R: 0xff, G: 0xff, B: 0xbF, A: 0xff}, // "#FFFFBFFF"
}) {
t.Error("Heat does not agree with R heat.colors (ish)")
}
}
func TestRadial(t *testing.T) {
rad := Radial(10, Cyan, Magenta, 1)
if !reflect.DeepEqual(rad, divergingPalette{
color.NRGBA{R: 0x7f, G: 0xff, B: 0xff, A: 0xff}, // "#80FFFFFF" Off by one compared to R.
color.NRGBA{R: 0x99, G: 0xff, B: 0xff, A: 0xff}, // "#99FFFFFF"
color.NRGBA{R: 0xb3, G: 0xff, B: 0xff, A: 0xff}, // "#B3FFFFFF"
color.NRGBA{R: 0xcc, G: 0xff, B: 0xff, A: 0xff}, // "#CCFFFFFF"
color.NRGBA{R: 0xe6, G: 0xff, B: 0xff, A: 0xff}, // "#E6FFFFFF" - middle low
color.NRGBA{R: 0xff, G: 0xe6, B: 0xff, A: 0xff}, // "#FFE6FFFF" - middle high
color.NRGBA{R: 0xff, G: 0xcc, B: 0xff, A: 0xff}, // "#FFCCFFFF"
color.NRGBA{R: 0xff, G: 0xb3, B: 0xff, A: 0xff}, // "#FFB3FFFF"
color.NRGBA{R: 0xff, G: 0x99, B: 0xff, A: 0xff}, // "#FF99FFFF"
color.NRGBA{R: 0xff, G: 0x7f, B: 0xff, A: 0xff}, // "#FF80FFFF" Off by one compared to R.
}) {
t.Error("Radial does not agree with R cm.colors (ish)")
}
if l, h := rad.CriticalIndex(); l != 4 || h != 5 {
t.Errorf("Radial(10...) gives unexpected critical index values: %d and %d", l, h)
}
}
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