From e07baca3a85915e53a1f7ca536fc7737ed452abc Mon Sep 17 00:00:00 2001 From: Steven Polley Date: Mon, 23 Jul 2018 20:05:33 -0600 Subject: [PATCH] Initial structure --- color.go | 346 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ main.go | 211 +++++++++++++++++++++++++++++++++ 2 files changed, 557 insertions(+) create mode 100644 color.go create mode 100644 main.go diff --git a/color.go b/color.go new file mode 100644 index 0000000..bcaeaf5 --- /dev/null +++ b/color.go @@ -0,0 +1,346 @@ +package main + +import ( + "image/color" +) + +type Color struct { + Step float64 + Color color.Color +} + +type ColorMap struct { + Keyword string + Colors []Color +} + +var ColorPalettes = []ColorMap{ + {"AfternoonBlue", []Color{ + {0.0, color.RGBA{0x93, 0xd2, 0xca, 0xff}}, + {0.2, color.RGBA{0x6c, 0x98, 0xb8, 0xff}}, + {0.5, color.RGBA{0x38, 0x68, 0x85, 0xff}}, + {0.8, color.RGBA{0x17, 0x4f, 0x72, 0xff}}, + {1.0, color.RGBA{0x08, 0x2a, 0x4f, 0xff}}, + }}, + {"SummerBeach", []Color{ + {0.0, color.RGBA{0xff, 0xf0, 0x94, 0xff}}, + {0.3, color.RGBA{0xff, 0xb7, 0x2d, 0xff}}, + {0.6, color.RGBA{0xff, 0x8d, 0x00, 0xff}}, + {0.8, color.RGBA{0x2d, 0x69, 0xae, 0xff}}, + {1.0, color.RGBA{0x1e, 0x2c, 0x60, 0xff}}, + }}, + {"Biochimist", []Color{ + Color{Color: color.RGBA{0x51, 0x99, 0x25, 0xff}}, + Color{Color: color.RGBA{0x50, 0xa6, 0x1c, 0xff}}, + Color{Color: color.RGBA{0x4b, 0xb8, 0x0b, 0xff}}, + Color{Color: color.RGBA{0x4d, 0xcd, 0x00, 0xff}}, + Color{Color: color.RGBA{0x53, 0xdf, 0x00, 0xff}}, + }}, + {"Fiesta", []Color{ + Color{Color: color.RGBA{0x03, 0x67, 0xa6, 0xff}}, + Color{Color: color.RGBA{0x04, 0xad, 0xbf, 0xff}}, + Color{Color: color.RGBA{0x93, 0xa6, 0x03, 0xff}}, + Color{Color: color.RGBA{0xe5, 0xce, 0x1b, 0xff}}, + Color{Color: color.RGBA{0xc8, 0x3f, 0x2a, 0xff}}, + }}, + {"Hippi", []Color{ + Color{Color: color.RGBA{0x00, 0x04, 0x0f, 0xff}}, + Color{Color: color.RGBA{0x03, 0x26, 0x28, 0xff}}, + Color{Color: color.RGBA{0x07, 0x3e, 0x1e, 0xff}}, + Color{Color: color.RGBA{0x18, 0x55, 0x08, 0xff}}, + Color{Color: color.RGBA{0x5f, 0x6e, 0x0f, 0xff}}, + Color{Color: color.RGBA{0x84, 0x50, 0x19, 0xff}}, + Color{Color: color.RGBA{0x9b, 0x30, 0x22, 0xff}}, + Color{Color: color.RGBA{0xb4, 0x92, 0x2f, 0xff}}, + Color{Color: color.RGBA{0x94, 0xca, 0x3d, 0xff}}, + Color{Color: color.RGBA{0x4f, 0xd5, 0x51, 0xff}}, + Color{Color: color.RGBA{0x66, 0xff, 0xb3, 0xff}}, + Color{Color: color.RGBA{0x82, 0xc9, 0xe5, 0xff}}, + Color{Color: color.RGBA{0x9d, 0xa3, 0xeb, 0xff}}, + Color{Color: color.RGBA{0xd7, 0xb5, 0xf3, 0xff}}, + Color{Color: color.RGBA{0xfd, 0xd6, 0xf6, 0xff}}, + Color{Color: color.RGBA{0xff, 0xf0, 0xf2, 0xff}}, + }}, + {"Vivid", []Color{ + Color{Color: color.RGBA{0x02, 0x3b, 0x2b, 0xff}}, + Color{Color: color.RGBA{0x36, 0x34, 0x48, 0xff}}, + Color{Color: color.RGBA{0x04, 0x8b, 0x64, 0xff}}, + Color{Color: color.RGBA{0x81, 0x6a, 0x6e, 0xff}}, + Color{Color: color.RGBA{0x8d, 0x5e, 0x67, 0xff}}, + Color{Color: color.RGBA{0x98, 0x52, 0x60, 0xff}}, + Color{Color: color.RGBA{0xa4, 0x46, 0x59, 0xff}}, + Color{Color: color.RGBA{0xd3, 0x17, 0x3d, 0xff}}, + Color{Color: color.RGBA{0xe1, 0x08, 0x34, 0xff}}, + Color{Color: color.RGBA{0xde, 0x17, 0x30, 0xff}}, + Color{Color: color.RGBA{0xdc, 0x26, 0x2d, 0xff}}, + Color{Color: color.RGBA{0xd9, 0x36, 0x2a, 0xff}}, + Color{Color: color.RGBA{0xd7, 0x45, 0x27, 0xff}}, + Color{Color: color.RGBA{0xd5, 0x55, 0x24, 0xff}}, + Color{Color: color.RGBA{0xd2, 0x64, 0x21, 0xff}}, + Color{Color: color.RGBA{0xd0, 0x74, 0x1e, 0xff}}, + Color{Color: color.RGBA{0xce, 0x83, 0x1b, 0xff}}, + Color{Color: color.RGBA{0xcb, 0x92, 0x18, 0xff}}, + Color{Color: color.RGBA{0xc9, 0xa2, 0x15, 0xff}}, + Color{Color: color.RGBA{0x11, 0x03, 0x12, 0xff}}, + Color{Color: color.RGBA{0x33, 0x08, 0x35, 0xff}}, + Color{Color: color.RGBA{0xf5, 0xca, 0xf7, 0xff}}, + }}, + {"Plan9", []Color{ + Color{Color: color.RGBA{0x00, 0x00, 0x00, 0xff}}, + Color{Color: color.RGBA{0x00, 0x00, 0x44, 0xff}}, + Color{Color: color.RGBA{0x00, 0x00, 0x88, 0xff}}, + Color{Color: color.RGBA{0x00, 0x00, 0xcc, 0xff}}, + Color{Color: color.RGBA{0x00, 0x44, 0x00, 0xff}}, + Color{Color: color.RGBA{0x00, 0x44, 0x44, 0xff}}, + Color{Color: color.RGBA{0x00, 0x44, 0x88, 0xff}}, + Color{Color: color.RGBA{0x00, 0x44, 0xcc, 0xff}}, + Color{Color: color.RGBA{0x00, 0x88, 0x00, 0xff}}, + Color{Color: color.RGBA{0x00, 0x88, 0x44, 0xff}}, + Color{Color: color.RGBA{0x00, 0x88, 0x88, 0xff}}, + Color{Color: color.RGBA{0x00, 0x88, 0xcc, 0xff}}, + Color{Color: color.RGBA{0x00, 0xcc, 0x00, 0xff}}, + Color{Color: color.RGBA{0x00, 0xcc, 0x44, 0xff}}, + Color{Color: color.RGBA{0x00, 0xcc, 0x88, 0xff}}, + Color{Color: color.RGBA{0x00, 0xcc, 0xcc, 0xff}}, + Color{Color: color.RGBA{0x00, 0xdd, 0xdd, 0xff}}, + Color{Color: color.RGBA{0x11, 0x11, 0x11, 0xff}}, + Color{Color: color.RGBA{0x00, 0x00, 0x55, 0xff}}, + Color{Color: color.RGBA{0x00, 0x00, 0x99, 0xff}}, + Color{Color: color.RGBA{0x00, 0x00, 0xdd, 0xff}}, + Color{Color: color.RGBA{0x00, 0x55, 0x00, 0xff}}, + Color{Color: color.RGBA{0x00, 0x55, 0x55, 0xff}}, + Color{Color: color.RGBA{0x00, 0x4c, 0x99, 0xff}}, + Color{Color: color.RGBA{0x00, 0x49, 0xdd, 0xff}}, + Color{Color: color.RGBA{0x00, 0x99, 0x00, 0xff}}, + Color{Color: color.RGBA{0x00, 0x99, 0x4c, 0xff}}, + Color{Color: color.RGBA{0x00, 0x99, 0x99, 0xff}}, + Color{Color: color.RGBA{0x00, 0x93, 0xdd, 0xff}}, + Color{Color: color.RGBA{0x00, 0xdd, 0x00, 0xff}}, + Color{Color: color.RGBA{0x00, 0xdd, 0x49, 0xff}}, + Color{Color: color.RGBA{0x00, 0xdd, 0x93, 0xff}}, + Color{Color: color.RGBA{0x00, 0xee, 0x9e, 0xff}}, + Color{Color: color.RGBA{0x00, 0xee, 0xee, 0xff}}, + Color{Color: color.RGBA{0x22, 0x22, 0x22, 0xff}}, + Color{Color: color.RGBA{0x00, 0x00, 0x66, 0xff}}, + Color{Color: color.RGBA{0x00, 0x00, 0xaa, 0xff}}, + Color{Color: color.RGBA{0x00, 0x00, 0xee, 0xff}}, + Color{Color: color.RGBA{0x00, 0x66, 0x00, 0xff}}, + Color{Color: color.RGBA{0x00, 0x66, 0x66, 0xff}}, + Color{Color: color.RGBA{0x00, 0x55, 0xaa, 0xff}}, + Color{Color: color.RGBA{0x00, 0x4f, 0xee, 0xff}}, + Color{Color: color.RGBA{0x00, 0xaa, 0x00, 0xff}}, + Color{Color: color.RGBA{0x00, 0xaa, 0x55, 0xff}}, + Color{Color: color.RGBA{0x00, 0xaa, 0xaa, 0xff}}, + Color{Color: color.RGBA{0x00, 0x9e, 0xee, 0xff}}, + Color{Color: color.RGBA{0x00, 0xee, 0x00, 0xff}}, + Color{Color: color.RGBA{0x00, 0xee, 0x4f, 0xff}}, + Color{Color: color.RGBA{0x00, 0xff, 0x55, 0xff}}, + Color{Color: color.RGBA{0x00, 0xff, 0xaa, 0xff}}, + Color{Color: color.RGBA{0x00, 0xff, 0xff, 0xff}}, + Color{Color: color.RGBA{0x33, 0x33, 0x33, 0xff}}, + Color{Color: color.RGBA{0x00, 0x00, 0x77, 0xff}}, + Color{Color: color.RGBA{0x00, 0x00, 0xbb, 0xff}}, + Color{Color: color.RGBA{0x00, 0x00, 0xff, 0xff}}, + Color{Color: color.RGBA{0x00, 0x77, 0x00, 0xff}}, + Color{Color: color.RGBA{0x00, 0x77, 0x77, 0xff}}, + Color{Color: color.RGBA{0x00, 0x5d, 0xbb, 0xff}}, + Color{Color: color.RGBA{0x00, 0x55, 0xff, 0xff}}, + Color{Color: color.RGBA{0x00, 0xbb, 0x00, 0xff}}, + Color{Color: color.RGBA{0x00, 0xbb, 0x5d, 0xff}}, + Color{Color: color.RGBA{0x00, 0xbb, 0xbb, 0xff}}, + Color{Color: color.RGBA{0x00, 0xaa, 0xff, 0xff}}, + Color{Color: color.RGBA{0x00, 0xff, 0x00, 0xff}}, + Color{Color: color.RGBA{0x44, 0x00, 0x44, 0xff}}, + Color{Color: color.RGBA{0x44, 0x00, 0x88, 0xff}}, + Color{Color: color.RGBA{0x44, 0x00, 0xcc, 0xff}}, + Color{Color: color.RGBA{0x44, 0x44, 0x00, 0xff}}, + Color{Color: color.RGBA{0x44, 0x44, 0x44, 0xff}}, + Color{Color: color.RGBA{0x44, 0x44, 0x88, 0xff}}, + Color{Color: color.RGBA{0x44, 0x44, 0xcc, 0xff}}, + Color{Color: color.RGBA{0x44, 0x88, 0x00, 0xff}}, + Color{Color: color.RGBA{0x44, 0x88, 0x44, 0xff}}, + Color{Color: color.RGBA{0x44, 0x88, 0x88, 0xff}}, + Color{Color: color.RGBA{0x44, 0x88, 0xcc, 0xff}}, + Color{Color: color.RGBA{0x44, 0xcc, 0x00, 0xff}}, + Color{Color: color.RGBA{0x44, 0xcc, 0x44, 0xff}}, + Color{Color: color.RGBA{0x44, 0xcc, 0x88, 0xff}}, + Color{Color: color.RGBA{0x44, 0xcc, 0xcc, 0xff}}, + Color{Color: color.RGBA{0x44, 0x00, 0x00, 0xff}}, + Color{Color: color.RGBA{0x55, 0x00, 0x00, 0xff}}, + Color{Color: color.RGBA{0x55, 0x00, 0x55, 0xff}}, + Color{Color: color.RGBA{0x4c, 0x00, 0x99, 0xff}}, + Color{Color: color.RGBA{0x49, 0x00, 0xdd, 0xff}}, + Color{Color: color.RGBA{0x55, 0x55, 0x00, 0xff}}, + Color{Color: color.RGBA{0x55, 0x55, 0x55, 0xff}}, + Color{Color: color.RGBA{0x4c, 0x4c, 0x99, 0xff}}, + Color{Color: color.RGBA{0x49, 0x49, 0xdd, 0xff}}, + Color{Color: color.RGBA{0x4c, 0x99, 0x00, 0xff}}, + Color{Color: color.RGBA{0x4c, 0x99, 0x4c, 0xff}}, + Color{Color: color.RGBA{0x4c, 0x99, 0x99, 0xff}}, + Color{Color: color.RGBA{0x49, 0x93, 0xdd, 0xff}}, + Color{Color: color.RGBA{0x49, 0xdd, 0x00, 0xff}}, + Color{Color: color.RGBA{0x49, 0xdd, 0x49, 0xff}}, + Color{Color: color.RGBA{0x49, 0xdd, 0x93, 0xff}}, + Color{Color: color.RGBA{0x49, 0xdd, 0xdd, 0xff}}, + Color{Color: color.RGBA{0x4f, 0xee, 0xee, 0xff}}, + Color{Color: color.RGBA{0x66, 0x00, 0x00, 0xff}}, + Color{Color: color.RGBA{0x66, 0x00, 0x66, 0xff}}, + Color{Color: color.RGBA{0x55, 0x00, 0xaa, 0xff}}, + Color{Color: color.RGBA{0x4f, 0x00, 0xee, 0xff}}, + Color{Color: color.RGBA{0x66, 0x66, 0x00, 0xff}}, + Color{Color: color.RGBA{0x66, 0x66, 0x66, 0xff}}, + Color{Color: color.RGBA{0x55, 0x55, 0xaa, 0xff}}, + Color{Color: color.RGBA{0x4f, 0x4f, 0xee, 0xff}}, + Color{Color: color.RGBA{0x55, 0xaa, 0x00, 0xff}}, + Color{Color: color.RGBA{0x55, 0xaa, 0x55, 0xff}}, + Color{Color: color.RGBA{0x55, 0xaa, 0xaa, 0xff}}, + Color{Color: color.RGBA{0x4f, 0x9e, 0xee, 0xff}}, + Color{Color: color.RGBA{0x4f, 0xee, 0x00, 0xff}}, + Color{Color: color.RGBA{0x4f, 0xee, 0x4f, 0xff}}, + Color{Color: color.RGBA{0x4f, 0xee, 0x9e, 0xff}}, + Color{Color: color.RGBA{0x55, 0xff, 0xaa, 0xff}}, + Color{Color: color.RGBA{0x55, 0xff, 0xff, 0xff}}, + Color{Color: color.RGBA{0x77, 0x00, 0x00, 0xff}}, + Color{Color: color.RGBA{0x77, 0x00, 0x77, 0xff}}, + Color{Color: color.RGBA{0x5d, 0x00, 0xbb, 0xff}}, + Color{Color: color.RGBA{0x55, 0x00, 0xff, 0xff}}, + Color{Color: color.RGBA{0x77, 0x77, 0x00, 0xff}}, + Color{Color: color.RGBA{0x77, 0x77, 0x77, 0xff}}, + Color{Color: color.RGBA{0x5d, 0x5d, 0xbb, 0xff}}, + Color{Color: color.RGBA{0x55, 0x55, 0xff, 0xff}}, + Color{Color: color.RGBA{0x5d, 0xbb, 0x00, 0xff}}, + Color{Color: color.RGBA{0x5d, 0xbb, 0x5d, 0xff}}, + Color{Color: color.RGBA{0x5d, 0xbb, 0xbb, 0xff}}, + Color{Color: color.RGBA{0x55, 0xaa, 0xff, 0xff}}, + Color{Color: color.RGBA{0x55, 0xff, 0x00, 0xff}}, + Color{Color: color.RGBA{0x55, 0xff, 0x55, 0xff}}, + Color{Color: color.RGBA{0x88, 0x00, 0x88, 0xff}}, + Color{Color: color.RGBA{0x88, 0x00, 0xcc, 0xff}}, + Color{Color: color.RGBA{0x88, 0x44, 0x00, 0xff}}, + Color{Color: color.RGBA{0x88, 0x44, 0x44, 0xff}}, + Color{Color: color.RGBA{0x88, 0x44, 0x88, 0xff}}, + Color{Color: color.RGBA{0x88, 0x44, 0xcc, 0xff}}, + Color{Color: color.RGBA{0x88, 0x88, 0x00, 0xff}}, + Color{Color: color.RGBA{0x88, 0x88, 0x44, 0xff}}, + Color{Color: color.RGBA{0x88, 0x88, 0x88, 0xff}}, + Color{Color: color.RGBA{0x88, 0x88, 0xcc, 0xff}}, + Color{Color: color.RGBA{0x88, 0xcc, 0x00, 0xff}}, + Color{Color: color.RGBA{0x88, 0xcc, 0x44, 0xff}}, + Color{Color: color.RGBA{0x88, 0xcc, 0x88, 0xff}}, + Color{Color: color.RGBA{0x88, 0xcc, 0xcc, 0xff}}, + Color{Color: color.RGBA{0x88, 0x00, 0x00, 0xff}}, + Color{Color: color.RGBA{0x88, 0x00, 0x44, 0xff}}, + Color{Color: color.RGBA{0x99, 0x00, 0x4c, 0xff}}, + Color{Color: color.RGBA{0x99, 0x00, 0x99, 0xff}}, + Color{Color: color.RGBA{0x93, 0x00, 0xdd, 0xff}}, + Color{Color: color.RGBA{0x99, 0x4c, 0x00, 0xff}}, + Color{Color: color.RGBA{0x99, 0x4c, 0x4c, 0xff}}, + Color{Color: color.RGBA{0x99, 0x4c, 0x99, 0xff}}, + Color{Color: color.RGBA{0x93, 0x49, 0xdd, 0xff}}, + Color{Color: color.RGBA{0x99, 0x99, 0x00, 0xff}}, + Color{Color: color.RGBA{0x99, 0x99, 0x4c, 0xff}}, + Color{Color: color.RGBA{0x99, 0x99, 0x99, 0xff}}, + Color{Color: color.RGBA{0x93, 0x93, 0xdd, 0xff}}, + Color{Color: color.RGBA{0x93, 0xdd, 0x00, 0xff}}, + Color{Color: color.RGBA{0x93, 0xdd, 0x49, 0xff}}, + Color{Color: color.RGBA{0x93, 0xdd, 0x93, 0xff}}, + Color{Color: color.RGBA{0x93, 0xdd, 0xdd, 0xff}}, + Color{Color: color.RGBA{0x99, 0x00, 0x00, 0xff}}, + Color{Color: color.RGBA{0xaa, 0x00, 0x00, 0xff}}, + Color{Color: color.RGBA{0xaa, 0x00, 0x55, 0xff}}, + Color{Color: color.RGBA{0xaa, 0x00, 0xaa, 0xff}}, + Color{Color: color.RGBA{0x9e, 0x00, 0xee, 0xff}}, + Color{Color: color.RGBA{0xaa, 0x55, 0x00, 0xff}}, + Color{Color: color.RGBA{0xaa, 0x55, 0x55, 0xff}}, + Color{Color: color.RGBA{0xaa, 0x55, 0xaa, 0xff}}, + Color{Color: color.RGBA{0x9e, 0x4f, 0xee, 0xff}}, + Color{Color: color.RGBA{0xaa, 0xaa, 0x00, 0xff}}, + Color{Color: color.RGBA{0xaa, 0xaa, 0x55, 0xff}}, + Color{Color: color.RGBA{0xaa, 0xaa, 0xaa, 0xff}}, + Color{Color: color.RGBA{0x9e, 0x9e, 0xee, 0xff}}, + Color{Color: color.RGBA{0x9e, 0xee, 0x00, 0xff}}, + Color{Color: color.RGBA{0x9e, 0xee, 0x4f, 0xff}}, + Color{Color: color.RGBA{0x9e, 0xee, 0x9e, 0xff}}, + Color{Color: color.RGBA{0x9e, 0xee, 0xee, 0xff}}, + Color{Color: color.RGBA{0xaa, 0xff, 0xff, 0xff}}, + Color{Color: color.RGBA{0xbb, 0x00, 0x00, 0xff}}, + Color{Color: color.RGBA{0xbb, 0x00, 0x5d, 0xff}}, + Color{Color: color.RGBA{0xbb, 0x00, 0xbb, 0xff}}, + Color{Color: color.RGBA{0xaa, 0x00, 0xff, 0xff}}, + Color{Color: color.RGBA{0xbb, 0x5d, 0x00, 0xff}}, + Color{Color: color.RGBA{0xbb, 0x5d, 0x5d, 0xff}}, + Color{Color: color.RGBA{0xbb, 0x5d, 0xbb, 0xff}}, + Color{Color: color.RGBA{0xaa, 0x55, 0xff, 0xff}}, + Color{Color: color.RGBA{0xbb, 0xbb, 0x00, 0xff}}, + Color{Color: color.RGBA{0xbb, 0xbb, 0x5d, 0xff}}, + Color{Color: color.RGBA{0xbb, 0xbb, 0xbb, 0xff}}, + Color{Color: color.RGBA{0xaa, 0xaa, 0xff, 0xff}}, + Color{Color: color.RGBA{0xaa, 0xff, 0x00, 0xff}}, + Color{Color: color.RGBA{0xaa, 0xff, 0x55, 0xff}}, + Color{Color: color.RGBA{0xaa, 0xff, 0xaa, 0xff}}, + Color{Color: color.RGBA{0xcc, 0x00, 0xcc, 0xff}}, + Color{Color: color.RGBA{0xcc, 0x44, 0x00, 0xff}}, + Color{Color: color.RGBA{0xcc, 0x44, 0x44, 0xff}}, + Color{Color: color.RGBA{0xcc, 0x44, 0x88, 0xff}}, + Color{Color: color.RGBA{0xcc, 0x44, 0xcc, 0xff}}, + Color{Color: color.RGBA{0xcc, 0x88, 0x00, 0xff}}, + Color{Color: color.RGBA{0xcc, 0x88, 0x44, 0xff}}, + Color{Color: color.RGBA{0xcc, 0x88, 0x88, 0xff}}, + Color{Color: color.RGBA{0xcc, 0x88, 0xcc, 0xff}}, + Color{Color: color.RGBA{0xcc, 0xcc, 0x00, 0xff}}, + Color{Color: color.RGBA{0xcc, 0xcc, 0x44, 0xff}}, + Color{Color: color.RGBA{0xcc, 0xcc, 0x88, 0xff}}, + Color{Color: color.RGBA{0xcc, 0xcc, 0xcc, 0xff}}, + Color{Color: color.RGBA{0xcc, 0x00, 0x00, 0xff}}, + Color{Color: color.RGBA{0xcc, 0x00, 0x44, 0xff}}, + Color{Color: color.RGBA{0xcc, 0x00, 0x88, 0xff}}, + Color{Color: color.RGBA{0xdd, 0x00, 0x93, 0xff}}, + Color{Color: color.RGBA{0xdd, 0x00, 0xdd, 0xff}}, + Color{Color: color.RGBA{0xdd, 0x49, 0x00, 0xff}}, + Color{Color: color.RGBA{0xdd, 0x49, 0x49, 0xff}}, + Color{Color: color.RGBA{0xdd, 0x49, 0x93, 0xff}}, + Color{Color: color.RGBA{0xdd, 0x49, 0xdd, 0xff}}, + Color{Color: color.RGBA{0xdd, 0x93, 0x00, 0xff}}, + Color{Color: color.RGBA{0xdd, 0x93, 0x49, 0xff}}, + Color{Color: color.RGBA{0xdd, 0x93, 0x93, 0xff}}, + Color{Color: color.RGBA{0xdd, 0x93, 0xdd, 0xff}}, + Color{Color: color.RGBA{0xdd, 0xdd, 0x00, 0xff}}, + Color{Color: color.RGBA{0xdd, 0xdd, 0x49, 0xff}}, + Color{Color: color.RGBA{0xdd, 0xdd, 0x93, 0xff}}, + Color{Color: color.RGBA{0xdd, 0xdd, 0xdd, 0xff}}, + Color{Color: color.RGBA{0xdd, 0x00, 0x00, 0xff}}, + Color{Color: color.RGBA{0xdd, 0x00, 0x49, 0xff}}, + Color{Color: color.RGBA{0xee, 0x00, 0x4f, 0xff}}, + Color{Color: color.RGBA{0xee, 0x00, 0x9e, 0xff}}, + Color{Color: color.RGBA{0xee, 0x00, 0xee, 0xff}}, + Color{Color: color.RGBA{0xee, 0x4f, 0x00, 0xff}}, + Color{Color: color.RGBA{0xee, 0x4f, 0x4f, 0xff}}, + Color{Color: color.RGBA{0xee, 0x4f, 0x9e, 0xff}}, + Color{Color: color.RGBA{0xee, 0x4f, 0xee, 0xff}}, + Color{Color: color.RGBA{0xee, 0x9e, 0x00, 0xff}}, + Color{Color: color.RGBA{0xee, 0x9e, 0x4f, 0xff}}, + Color{Color: color.RGBA{0xee, 0x9e, 0x9e, 0xff}}, + Color{Color: color.RGBA{0xee, 0x9e, 0xee, 0xff}}, + Color{Color: color.RGBA{0xee, 0xee, 0x00, 0xff}}, + Color{Color: color.RGBA{0xee, 0xee, 0x4f, 0xff}}, + Color{Color: color.RGBA{0xee, 0xee, 0x9e, 0xff}}, + Color{Color: color.RGBA{0xee, 0xee, 0xee, 0xff}}, + Color{Color: color.RGBA{0xee, 0x00, 0x00, 0xff}}, + Color{Color: color.RGBA{0xff, 0x00, 0x00, 0xff}}, + Color{Color: color.RGBA{0xff, 0x00, 0x55, 0xff}}, + Color{Color: color.RGBA{0xff, 0x00, 0xaa, 0xff}}, + Color{Color: color.RGBA{0xff, 0x00, 0xff, 0xff}}, + Color{Color: color.RGBA{0xff, 0x55, 0x00, 0xff}}, + Color{Color: color.RGBA{0xff, 0x55, 0x55, 0xff}}, + Color{Color: color.RGBA{0xff, 0x55, 0xaa, 0xff}}, + Color{Color: color.RGBA{0xff, 0x55, 0xff, 0xff}}, + Color{Color: color.RGBA{0xff, 0xaa, 0x00, 0xff}}, + Color{Color: color.RGBA{0xff, 0xaa, 0x55, 0xff}}, + Color{Color: color.RGBA{0xff, 0xaa, 0xaa, 0xff}}, + Color{Color: color.RGBA{0xff, 0xaa, 0xff, 0xff}}, + Color{Color: color.RGBA{0xff, 0xff, 0x00, 0xff}}, + Color{Color: color.RGBA{0xff, 0xff, 0x55, 0xff}}, + Color{Color: color.RGBA{0xff, 0xff, 0xaa, 0xff}}, + Color{Color: color.RGBA{0xff, 0xff, 0xff, 0xff}}, + }}, +} diff --git a/main.go b/main.go new file mode 100644 index 0000000..bd48664 --- /dev/null +++ b/main.go @@ -0,0 +1,211 @@ +package main + +import ( + "flag" + "fmt" + "image" + "image/color" + "image/png" + "math" + "os" + "sync" + "time" +) + +var ( + colorPalette string + colorStep float64 + xpos, ypos float64 + width, height int + imageSmoothness int + maxIteration int + escapeRadius float64 + outputFile string +) + +var waitGroup sync.WaitGroup + +func init() { + flag.Float64Var(&colorStep, "step", 12000, "Color smooth step. Value should be greater than iteration count, otherwise the value will be adjusted to the iteration count.") + flag.IntVar(&width, "width", 480, "Rendered image width") + flag.IntVar(&height, "height", 270, "Rendered image height") + flag.Float64Var(&xpos, "xpos", -0.00275, "Point position on the real axis (defined on `x` axis)") + flag.Float64Var(&ypos, "ypos", 0.78912, "Point position on the imaginary axis (defined on `y` axis)") + flag.Float64Var(&escapeRadius, "radius", .125689, "Escape Radius") + flag.IntVar(&maxIteration, "iteration", 2400, "Iteration count") + flag.IntVar(&imageSmoothness, "smoothness", 8, "The rendered mandelbrot set smoothness. For a more detailded and clear image use higher numbers. For 4xAA (AA = antialiasing) use -smoothness 4") + flag.StringVar(&colorPalette, "palette", "Plan9", "Hippi | Plan9 | AfternoonBlue | SummerBeach | Biochimist | Fiesta") + flag.StringVar(&outputFile, "file", "mandelbrot.png", "The rendered mandelbrot image filname") + flag.Parse() +} + +func main() { + done := make(chan struct{}) + ticker := time.NewTicker(time.Millisecond * 100) + + go func() { + for { + select { + case <-ticker.C: + fmt.Print(".") + case <-done: + ticker.Stop() + fmt.Printf("\n\nMandelbrot set rendered into `%s`\n", outputFile) + } + } + }() + + if colorStep < float64(maxIteration) { + colorStep = float64(maxIteration) + } + colors := interpolateColors(&colorPalette, colorStep) + + if len(colors) > 0 { + fmt.Print("Rendering image...") + render(maxIteration, colors, done) + } + time.Sleep(time.Second) +} + +func interpolateColors(paletteCode *string, numberOfColors float64) []color.RGBA { + var factor float64 + steps := []float64{} + cols := []uint32{} + interpolated := []uint32{} + interpolatedColors := []color.RGBA{} + + for _, v := range ColorPalettes { + factor = 1.0 / numberOfColors + switch v.Keyword { + case *paletteCode: + if paletteCode != nil { + for index, col := range v.Colors { + if col.Step == 0.0 && index != 0 { + stepRatio := float64(index+1) / float64(len(v.Colors)) + step := float64(int(stepRatio*100)) / 100 // truncate to 2 decimal precision + steps = append(steps, step) + } else { + steps = append(steps, col.Step) + } + r, g, b, a := col.Color.RGBA() + r /= 0xff + g /= 0xff + b /= 0xff + a /= 0xff + uintColor := uint32(r)<<24 | uint32(g)<<16 | uint32(b)<<8 | uint32(a) + cols = append(cols, uintColor) + } + + var min, max, minColor, maxColor float64 + if len(v.Colors) == len(steps) && len(v.Colors) == len(cols) { + for i := 0.0; i <= 1; i += factor { + for j := 0; j < len(v.Colors)-1; j++ { + if i >= steps[j] && i < steps[j+1] { + min = steps[j] + max = steps[j+1] + minColor = float64(cols[j]) + maxColor = float64(cols[j+1]) + uintColor := cosineInterpolation(maxColor, minColor, (i-min)/(max-min)) + interpolated = append(interpolated, uint32(uintColor)) + } + } + } + } + + for _, pixelValue := range interpolated { + r := pixelValue >> 24 & 0xff + g := pixelValue >> 16 & 0xff + b := pixelValue >> 8 & 0xff + a := 0xff + + interpolatedColors = append(interpolatedColors, color.RGBA{uint8(r), uint8(g), uint8(b), uint8(a)}) + } + } + } + } + + return interpolatedColors +} + +func render(maxIteration int, colors []color.RGBA, done chan struct{}) { + width = width * imageSmoothness + height = height * imageSmoothness + ratio := float64(height) / float64(width) + xmin, xmax := xpos-escapeRadius/2.0, math.Abs(xpos+escapeRadius/2.0) + ymin, ymax := ypos-escapeRadius*ratio/2.0, math.Abs(ypos+escapeRadius*ratio/2.0) + + image := image.NewRGBA(image.Rectangle{image.Point{0, 0}, image.Point{width, height}}) + + for iy := 0; iy < height; iy++ { + waitGroup.Add(1) + go func(iy int) { + defer waitGroup.Done() + + for ix := 0; ix < width; ix++ { + var x = xmin + (xmax-xmin)*float64(ix)/float64(width-1) + var y = ymin + (ymax-ymin)*float64(iy)/float64(height-1) + norm, it := mandelIteration(x, y, maxIteration) + iteration := float64(maxIteration-it) + math.Log(norm) + + if int(math.Abs(iteration)) < len(colors)-1 { + color1 := colors[int(math.Abs(iteration))] + color2 := colors[int(math.Abs(iteration))+1] + color := linearInterpolation(rgbaToUint(color1), rgbaToUint(color2), uint32(iteration)) + + image.Set(ix, iy, uint32ToRgba(color)) + } + } + }(iy) + } + + waitGroup.Wait() + + output, _ := os.Create(outputFile) + png.Encode(output, image) + + done <- struct{}{} +} + +func cosineInterpolation(c1, c2, mu float64) float64 { + mu2 := (1 - math.Cos(mu*math.Pi)) / 2.0 + return c1*(1-mu2) + c2*mu2 +} + +func linearInterpolation(c1, c2, mu uint32) uint32 { + return c1*(1-mu) + c2*mu +} + +func mandelIteration(cx, cy float64, maxIter int) (float64, int) { + var x, y, xx, yy float64 = 0.0, 0.0, 0.0, 0.0 + + for i := 0; i < maxIter; i++ { + xy := x * y + xx = x * x + yy = y * y + if xx+yy > 4 { + return xx + yy, i + } + x = xx - yy + cx + y = 2*xy + cy + } + + logZn := (x*x + y*y) / 2 + return logZn, maxIter +} + +func rgbaToUint(color color.RGBA) uint32 { + r, g, b, a := color.RGBA() + r /= 0xff + g /= 0xff + b /= 0xff + a /= 0xff + return uint32(r)<<24 | uint32(g)<<16 | uint32(b)<<8 | uint32(a) +} + +func uint32ToRgba(col uint32) color.RGBA { + r := col >> 24 & 0xff + g := col >> 16 & 0xff + b := col >> 8 & 0xff + a := 0xff + return color.RGBA{uint8(r), uint8(g), uint8(b), uint8(a)} +}