From c75fea71859277f58a132eb6b90fc24b9b73a108 Mon Sep 17 00:00:00 2001
From: Yongwei Xing <yongwei.xing@liulishuo.com>
Date: Tue, 2 Mar 2021 11:23:29 +0800
Subject: [PATCH] add gridsquare and refactor

---
 color.go                      | 539 ++++++++++++++++++++++++++++++++++
 example/example.go            |   7 +-
 example/example_gridsquare.go |  16 +
 example/example_maze.go       |  16 +-
 generativeart.go              |  97 +++++-
 maze.go                       |  13 +-
 squaregrid.go                 |  54 ++++
 wave.go                       |  31 +-
 8 files changed, 730 insertions(+), 43 deletions(-)
 create mode 100644 example/example_gridsquare.go
 create mode 100644 squaregrid.go

diff --git a/color.go b/color.go
index bc7c709..a0db994 100644
--- a/color.go
+++ b/color.go
@@ -22,4 +22,543 @@ var (
 	Orange           = color.RGBA{0xFF, 0xA5, 0x00, 0xFF}
 	Black            = color.RGBA{0x00, 0x00, 0x00, 0xFF}
 	White            = color.RGBA{0xFF, 0xFF, 0xFF, 0xFF}
+	Outdoors         = []color.RGBA{
+		{67, 110, 165, 255},
+		{47, 76, 114, 255},
+		{165, 138, 3, 255},
+		{242, 182, 4, 255},
+		{191, 131, 59, 255},
+	}
+	Reddery = []color.RGBA{
+		{89, 2, 16, 255},
+		{37, 2, 5, 255},
+		{186, 7, 55, 255},
+		{253, 55, 51, 255},
+		{245, 169, 167, 255},
+	}
+	DarkPink = []color.RGBA{
+		{2, 64, 89, 255},
+		{242, 131, 107, 255},
+		{140, 40, 31, 255},
+		{191, 69, 57, 255},
+		{13, 13, 13, 255},
+	}
+
+	Plasma = []color.RGBA{
+		color.RGBA{0x0c, 0x07, 0x86, 0xff},
+		color.RGBA{0x10, 0x07, 0x87, 0xff},
+		color.RGBA{0x13, 0x06, 0x89, 0xff},
+		color.RGBA{0x15, 0x06, 0x8a, 0xff},
+		color.RGBA{0x18, 0x06, 0x8b, 0xff},
+		color.RGBA{0x1b, 0x06, 0x8c, 0xff},
+		color.RGBA{0x1d, 0x06, 0x8d, 0xff},
+		color.RGBA{0x1f, 0x05, 0x8e, 0xff},
+		color.RGBA{0x21, 0x05, 0x8f, 0xff},
+		color.RGBA{0x23, 0x05, 0x90, 0xff},
+		color.RGBA{0x25, 0x05, 0x91, 0xff},
+		color.RGBA{0x27, 0x05, 0x92, 0xff},
+		color.RGBA{0x29, 0x05, 0x93, 0xff},
+		color.RGBA{0x2b, 0x05, 0x94, 0xff},
+		color.RGBA{0x2d, 0x04, 0x94, 0xff},
+		color.RGBA{0x2f, 0x04, 0x95, 0xff},
+		color.RGBA{0x31, 0x04, 0x96, 0xff},
+		color.RGBA{0x33, 0x04, 0x97, 0xff},
+		color.RGBA{0x34, 0x04, 0x98, 0xff},
+		color.RGBA{0x36, 0x04, 0x98, 0xff},
+		color.RGBA{0x38, 0x04, 0x99, 0xff},
+		color.RGBA{0x3a, 0x04, 0x9a, 0xff},
+		color.RGBA{0x3b, 0x03, 0x9a, 0xff},
+		color.RGBA{0x3d, 0x03, 0x9b, 0xff},
+		color.RGBA{0x3f, 0x03, 0x9c, 0xff},
+		color.RGBA{0x40, 0x03, 0x9c, 0xff},
+		color.RGBA{0x42, 0x03, 0x9d, 0xff},
+		color.RGBA{0x44, 0x03, 0x9e, 0xff},
+		color.RGBA{0x45, 0x03, 0x9e, 0xff},
+		color.RGBA{0x47, 0x02, 0x9f, 0xff},
+		color.RGBA{0x49, 0x02, 0x9f, 0xff},
+		color.RGBA{0x4a, 0x02, 0xa0, 0xff},
+		color.RGBA{0x4c, 0x02, 0xa1, 0xff},
+		color.RGBA{0x4e, 0x02, 0xa1, 0xff},
+		color.RGBA{0x4f, 0x02, 0xa2, 0xff},
+		color.RGBA{0x51, 0x01, 0xa2, 0xff},
+		color.RGBA{0x52, 0x01, 0xa3, 0xff},
+		color.RGBA{0x54, 0x01, 0xa3, 0xff},
+		color.RGBA{0x56, 0x01, 0xa3, 0xff},
+		color.RGBA{0x57, 0x01, 0xa4, 0xff},
+		color.RGBA{0x59, 0x01, 0xa4, 0xff},
+		color.RGBA{0x5a, 0x00, 0xa5, 0xff},
+		color.RGBA{0x5c, 0x00, 0xa5, 0xff},
+		color.RGBA{0x5e, 0x00, 0xa5, 0xff},
+		color.RGBA{0x5f, 0x00, 0xa6, 0xff},
+		color.RGBA{0x61, 0x00, 0xa6, 0xff},
+		color.RGBA{0x62, 0x00, 0xa6, 0xff},
+		color.RGBA{0x64, 0x00, 0xa7, 0xff},
+		color.RGBA{0x65, 0x00, 0xa7, 0xff},
+		color.RGBA{0x67, 0x00, 0xa7, 0xff},
+		color.RGBA{0x68, 0x00, 0xa7, 0xff},
+		color.RGBA{0x6a, 0x00, 0xa7, 0xff},
+		color.RGBA{0x6c, 0x00, 0xa8, 0xff},
+		color.RGBA{0x6d, 0x00, 0xa8, 0xff},
+		color.RGBA{0x6f, 0x00, 0xa8, 0xff},
+		color.RGBA{0x70, 0x00, 0xa8, 0xff},
+		color.RGBA{0x72, 0x00, 0xa8, 0xff},
+		color.RGBA{0x73, 0x00, 0xa8, 0xff},
+		color.RGBA{0x75, 0x00, 0xa8, 0xff},
+		color.RGBA{0x76, 0x01, 0xa8, 0xff},
+		color.RGBA{0x78, 0x01, 0xa8, 0xff},
+		color.RGBA{0x79, 0x01, 0xa8, 0xff},
+		color.RGBA{0x7b, 0x02, 0xa8, 0xff},
+		color.RGBA{0x7c, 0x02, 0xa7, 0xff},
+		color.RGBA{0x7e, 0x03, 0xa7, 0xff},
+		color.RGBA{0x7f, 0x03, 0xa7, 0xff},
+		color.RGBA{0x81, 0x04, 0xa7, 0xff},
+		color.RGBA{0x82, 0x04, 0xa7, 0xff},
+		color.RGBA{0x84, 0x05, 0xa6, 0xff},
+		color.RGBA{0x85, 0x06, 0xa6, 0xff},
+		color.RGBA{0x86, 0x07, 0xa6, 0xff},
+		color.RGBA{0x88, 0x07, 0xa5, 0xff},
+		color.RGBA{0x89, 0x08, 0xa5, 0xff},
+		color.RGBA{0x8b, 0x09, 0xa4, 0xff},
+		color.RGBA{0x8c, 0x0a, 0xa4, 0xff},
+		color.RGBA{0x8e, 0x0c, 0xa4, 0xff},
+		color.RGBA{0x8f, 0x0d, 0xa3, 0xff},
+		color.RGBA{0x90, 0x0e, 0xa3, 0xff},
+		color.RGBA{0x92, 0x0f, 0xa2, 0xff},
+		color.RGBA{0x93, 0x10, 0xa1, 0xff},
+		color.RGBA{0x95, 0x11, 0xa1, 0xff},
+		color.RGBA{0x96, 0x12, 0xa0, 0xff},
+		color.RGBA{0x97, 0x13, 0xa0, 0xff},
+		color.RGBA{0x99, 0x14, 0x9f, 0xff},
+		color.RGBA{0x9a, 0x15, 0x9e, 0xff},
+		color.RGBA{0x9b, 0x17, 0x9e, 0xff},
+		color.RGBA{0x9d, 0x18, 0x9d, 0xff},
+		color.RGBA{0x9e, 0x19, 0x9c, 0xff},
+		color.RGBA{0x9f, 0x1a, 0x9b, 0xff},
+		color.RGBA{0xa0, 0x1b, 0x9b, 0xff},
+		color.RGBA{0xa2, 0x1c, 0x9a, 0xff},
+		color.RGBA{0xa3, 0x1d, 0x99, 0xff},
+		color.RGBA{0xa4, 0x1e, 0x98, 0xff},
+		color.RGBA{0xa5, 0x1f, 0x97, 0xff},
+		color.RGBA{0xa7, 0x21, 0x97, 0xff},
+		color.RGBA{0xa8, 0x22, 0x96, 0xff},
+		color.RGBA{0xa9, 0x23, 0x95, 0xff},
+		color.RGBA{0xaa, 0x24, 0x94, 0xff},
+		color.RGBA{0xac, 0x25, 0x93, 0xff},
+		color.RGBA{0xad, 0x26, 0x92, 0xff},
+		color.RGBA{0xae, 0x27, 0x91, 0xff},
+		color.RGBA{0xaf, 0x28, 0x90, 0xff},
+		color.RGBA{0xb0, 0x2a, 0x8f, 0xff},
+		color.RGBA{0xb1, 0x2b, 0x8f, 0xff},
+		color.RGBA{0xb2, 0x2c, 0x8e, 0xff},
+		color.RGBA{0xb4, 0x2d, 0x8d, 0xff},
+		color.RGBA{0xb5, 0x2e, 0x8c, 0xff},
+		color.RGBA{0xb6, 0x2f, 0x8b, 0xff},
+		color.RGBA{0xb7, 0x30, 0x8a, 0xff},
+		color.RGBA{0xb8, 0x32, 0x89, 0xff},
+		color.RGBA{0xb9, 0x33, 0x88, 0xff},
+		color.RGBA{0xba, 0x34, 0x87, 0xff},
+		color.RGBA{0xbb, 0x35, 0x86, 0xff},
+		color.RGBA{0xbc, 0x36, 0x85, 0xff},
+		color.RGBA{0xbd, 0x37, 0x84, 0xff},
+		color.RGBA{0xbe, 0x38, 0x83, 0xff},
+		color.RGBA{0xbf, 0x39, 0x82, 0xff},
+		color.RGBA{0xc0, 0x3b, 0x81, 0xff},
+		color.RGBA{0xc1, 0x3c, 0x80, 0xff},
+		color.RGBA{0xc2, 0x3d, 0x80, 0xff},
+		color.RGBA{0xc3, 0x3e, 0x7f, 0xff},
+		color.RGBA{0xc4, 0x3f, 0x7e, 0xff},
+		color.RGBA{0xc5, 0x40, 0x7d, 0xff},
+		color.RGBA{0xc6, 0x41, 0x7c, 0xff},
+		color.RGBA{0xc7, 0x42, 0x7b, 0xff},
+		color.RGBA{0xc8, 0x44, 0x7a, 0xff},
+		color.RGBA{0xc9, 0x45, 0x79, 0xff},
+		color.RGBA{0xca, 0x46, 0x78, 0xff},
+		color.RGBA{0xcb, 0x47, 0x77, 0xff},
+		color.RGBA{0xcc, 0x48, 0x76, 0xff},
+		color.RGBA{0xcd, 0x49, 0x75, 0xff},
+		color.RGBA{0xce, 0x4a, 0x75, 0xff},
+		color.RGBA{0xcf, 0x4b, 0x74, 0xff},
+		color.RGBA{0xd0, 0x4d, 0x73, 0xff},
+		color.RGBA{0xd1, 0x4e, 0x72, 0xff},
+		color.RGBA{0xd1, 0x4f, 0x71, 0xff},
+		color.RGBA{0xd2, 0x50, 0x70, 0xff},
+		color.RGBA{0xd3, 0x51, 0x6f, 0xff},
+		color.RGBA{0xd4, 0x52, 0x6e, 0xff},
+		color.RGBA{0xd5, 0x53, 0x6d, 0xff},
+		color.RGBA{0xd6, 0x55, 0x6d, 0xff},
+		color.RGBA{0xd7, 0x56, 0x6c, 0xff},
+		color.RGBA{0xd7, 0x57, 0x6b, 0xff},
+		color.RGBA{0xd8, 0x58, 0x6a, 0xff},
+		color.RGBA{0xd9, 0x59, 0x69, 0xff},
+		color.RGBA{0xda, 0x5a, 0x68, 0xff},
+		color.RGBA{0xdb, 0x5b, 0x67, 0xff},
+		color.RGBA{0xdc, 0x5d, 0x66, 0xff},
+		color.RGBA{0xdc, 0x5e, 0x66, 0xff},
+		color.RGBA{0xdd, 0x5f, 0x65, 0xff},
+		color.RGBA{0xde, 0x60, 0x64, 0xff},
+		color.RGBA{0xdf, 0x61, 0x63, 0xff},
+		color.RGBA{0xdf, 0x62, 0x62, 0xff},
+		color.RGBA{0xe0, 0x64, 0x61, 0xff},
+		color.RGBA{0xe1, 0x65, 0x60, 0xff},
+		color.RGBA{0xe2, 0x66, 0x60, 0xff},
+		color.RGBA{0xe3, 0x67, 0x5f, 0xff},
+		color.RGBA{0xe3, 0x68, 0x5e, 0xff},
+		color.RGBA{0xe4, 0x6a, 0x5d, 0xff},
+		color.RGBA{0xe5, 0x6b, 0x5c, 0xff},
+		color.RGBA{0xe5, 0x6c, 0x5b, 0xff},
+		color.RGBA{0xe6, 0x6d, 0x5a, 0xff},
+		color.RGBA{0xe7, 0x6e, 0x5a, 0xff},
+		color.RGBA{0xe8, 0x70, 0x59, 0xff},
+		color.RGBA{0xe8, 0x71, 0x58, 0xff},
+		color.RGBA{0xe9, 0x72, 0x57, 0xff},
+		color.RGBA{0xea, 0x73, 0x56, 0xff},
+		color.RGBA{0xea, 0x74, 0x55, 0xff},
+		color.RGBA{0xeb, 0x76, 0x54, 0xff},
+		color.RGBA{0xec, 0x77, 0x54, 0xff},
+		color.RGBA{0xec, 0x78, 0x53, 0xff},
+		color.RGBA{0xed, 0x79, 0x52, 0xff},
+		color.RGBA{0xed, 0x7b, 0x51, 0xff},
+		color.RGBA{0xee, 0x7c, 0x50, 0xff},
+		color.RGBA{0xef, 0x7d, 0x4f, 0xff},
+		color.RGBA{0xef, 0x7e, 0x4e, 0xff},
+		color.RGBA{0xf0, 0x80, 0x4d, 0xff},
+		color.RGBA{0xf0, 0x81, 0x4d, 0xff},
+		color.RGBA{0xf1, 0x82, 0x4c, 0xff},
+		color.RGBA{0xf2, 0x84, 0x4b, 0xff},
+		color.RGBA{0xf2, 0x85, 0x4a, 0xff},
+		color.RGBA{0xf3, 0x86, 0x49, 0xff},
+		color.RGBA{0xf3, 0x87, 0x48, 0xff},
+		color.RGBA{0xf4, 0x89, 0x47, 0xff},
+		color.RGBA{0xf4, 0x8a, 0x47, 0xff},
+		color.RGBA{0xf5, 0x8b, 0x46, 0xff},
+		color.RGBA{0xf5, 0x8d, 0x45, 0xff},
+		color.RGBA{0xf6, 0x8e, 0x44, 0xff},
+		color.RGBA{0xf6, 0x8f, 0x43, 0xff},
+		color.RGBA{0xf6, 0x91, 0x42, 0xff},
+		color.RGBA{0xf7, 0x92, 0x41, 0xff},
+		color.RGBA{0xf7, 0x93, 0x41, 0xff},
+		color.RGBA{0xf8, 0x95, 0x40, 0xff},
+		color.RGBA{0xf8, 0x96, 0x3f, 0xff},
+		color.RGBA{0xf8, 0x98, 0x3e, 0xff},
+		color.RGBA{0xf9, 0x99, 0x3d, 0xff},
+		color.RGBA{0xf9, 0x9a, 0x3c, 0xff},
+		color.RGBA{0xfa, 0x9c, 0x3b, 0xff},
+		color.RGBA{0xfa, 0x9d, 0x3a, 0xff},
+		color.RGBA{0xfa, 0x9f, 0x3a, 0xff},
+		color.RGBA{0xfa, 0xa0, 0x39, 0xff},
+		color.RGBA{0xfb, 0xa2, 0x38, 0xff},
+		color.RGBA{0xfb, 0xa3, 0x37, 0xff},
+		color.RGBA{0xfb, 0xa4, 0x36, 0xff},
+		color.RGBA{0xfc, 0xa6, 0x35, 0xff},
+		color.RGBA{0xfc, 0xa7, 0x35, 0xff},
+		color.RGBA{0xfc, 0xa9, 0x34, 0xff},
+		color.RGBA{0xfc, 0xaa, 0x33, 0xff},
+		color.RGBA{0xfc, 0xac, 0x32, 0xff},
+		color.RGBA{0xfc, 0xad, 0x31, 0xff},
+		color.RGBA{0xfd, 0xaf, 0x31, 0xff},
+		color.RGBA{0xfd, 0xb0, 0x30, 0xff},
+		color.RGBA{0xfd, 0xb2, 0x2f, 0xff},
+		color.RGBA{0xfd, 0xb3, 0x2e, 0xff},
+		color.RGBA{0xfd, 0xb5, 0x2d, 0xff},
+		color.RGBA{0xfd, 0xb6, 0x2d, 0xff},
+		color.RGBA{0xfd, 0xb8, 0x2c, 0xff},
+		color.RGBA{0xfd, 0xb9, 0x2b, 0xff},
+		color.RGBA{0xfd, 0xbb, 0x2b, 0xff},
+		color.RGBA{0xfd, 0xbc, 0x2a, 0xff},
+		color.RGBA{0xfd, 0xbe, 0x29, 0xff},
+		color.RGBA{0xfd, 0xc0, 0x29, 0xff},
+		color.RGBA{0xfd, 0xc1, 0x28, 0xff},
+		color.RGBA{0xfd, 0xc3, 0x28, 0xff},
+		color.RGBA{0xfd, 0xc4, 0x27, 0xff},
+		color.RGBA{0xfd, 0xc6, 0x26, 0xff},
+		color.RGBA{0xfc, 0xc7, 0x26, 0xff},
+		color.RGBA{0xfc, 0xc9, 0x26, 0xff},
+		color.RGBA{0xfc, 0xcb, 0x25, 0xff},
+		color.RGBA{0xfc, 0xcc, 0x25, 0xff},
+		color.RGBA{0xfc, 0xce, 0x25, 0xff},
+		color.RGBA{0xfb, 0xd0, 0x24, 0xff},
+		color.RGBA{0xfb, 0xd1, 0x24, 0xff},
+		color.RGBA{0xfb, 0xd3, 0x24, 0xff},
+		color.RGBA{0xfa, 0xd5, 0x24, 0xff},
+		color.RGBA{0xfa, 0xd6, 0x24, 0xff},
+		color.RGBA{0xfa, 0xd8, 0x24, 0xff},
+		color.RGBA{0xf9, 0xd9, 0x24, 0xff},
+		color.RGBA{0xf9, 0xdb, 0x24, 0xff},
+		color.RGBA{0xf8, 0xdd, 0x24, 0xff},
+		color.RGBA{0xf8, 0xdf, 0x24, 0xff},
+		color.RGBA{0xf7, 0xe0, 0x24, 0xff},
+		color.RGBA{0xf7, 0xe2, 0x25, 0xff},
+		color.RGBA{0xf6, 0xe4, 0x25, 0xff},
+		color.RGBA{0xf6, 0xe5, 0x25, 0xff},
+		color.RGBA{0xf5, 0xe7, 0x26, 0xff},
+		color.RGBA{0xf5, 0xe9, 0x26, 0xff},
+		color.RGBA{0xf4, 0xea, 0x26, 0xff},
+		color.RGBA{0xf3, 0xec, 0x26, 0xff},
+		color.RGBA{0xf3, 0xee, 0x26, 0xff},
+		color.RGBA{0xf2, 0xf0, 0x26, 0xff},
+		color.RGBA{0xf2, 0xf1, 0x26, 0xff},
+		color.RGBA{0xf1, 0xf3, 0x26, 0xff},
+		color.RGBA{0xf0, 0xf5, 0x25, 0xff},
+		color.RGBA{0xf0, 0xf6, 0x23, 0xff},
+		color.RGBA{0xef, 0xf8, 0x21, 0xff},
+	}
+
+	Viridis = []color.RGBA{
+		color.RGBA{0x44, 0x01, 0x54, 0xff},
+		color.RGBA{0x44, 0x02, 0x55, 0xff},
+		color.RGBA{0x44, 0x03, 0x57, 0xff},
+		color.RGBA{0x45, 0x05, 0x58, 0xff},
+		color.RGBA{0x45, 0x06, 0x5a, 0xff},
+		color.RGBA{0x45, 0x08, 0x5b, 0xff},
+		color.RGBA{0x46, 0x09, 0x5c, 0xff},
+		color.RGBA{0x46, 0x0b, 0x5e, 0xff},
+		color.RGBA{0x46, 0x0c, 0x5f, 0xff},
+		color.RGBA{0x46, 0x0e, 0x61, 0xff},
+		color.RGBA{0x47, 0x0f, 0x62, 0xff},
+		color.RGBA{0x47, 0x11, 0x63, 0xff},
+		color.RGBA{0x47, 0x12, 0x65, 0xff},
+		color.RGBA{0x47, 0x14, 0x66, 0xff},
+		color.RGBA{0x47, 0x15, 0x67, 0xff},
+		color.RGBA{0x47, 0x16, 0x69, 0xff},
+		color.RGBA{0x47, 0x18, 0x6a, 0xff},
+		color.RGBA{0x48, 0x19, 0x6b, 0xff},
+		color.RGBA{0x48, 0x1a, 0x6c, 0xff},
+		color.RGBA{0x48, 0x1c, 0x6e, 0xff},
+		color.RGBA{0x48, 0x1d, 0x6f, 0xff},
+		color.RGBA{0x48, 0x1e, 0x70, 0xff},
+		color.RGBA{0x48, 0x20, 0x71, 0xff},
+		color.RGBA{0x48, 0x21, 0x72, 0xff},
+		color.RGBA{0x48, 0x22, 0x73, 0xff},
+		color.RGBA{0x48, 0x23, 0x74, 0xff},
+		color.RGBA{0x47, 0x25, 0x75, 0xff},
+		color.RGBA{0x47, 0x26, 0x76, 0xff},
+		color.RGBA{0x47, 0x27, 0x77, 0xff},
+		color.RGBA{0x47, 0x28, 0x78, 0xff},
+		color.RGBA{0x47, 0x2a, 0x79, 0xff},
+		color.RGBA{0x47, 0x2b, 0x7a, 0xff},
+		color.RGBA{0x47, 0x2c, 0x7b, 0xff},
+		color.RGBA{0x46, 0x2d, 0x7c, 0xff},
+		color.RGBA{0x46, 0x2f, 0x7c, 0xff},
+		color.RGBA{0x46, 0x30, 0x7d, 0xff},
+		color.RGBA{0x46, 0x31, 0x7e, 0xff},
+		color.RGBA{0x45, 0x32, 0x7f, 0xff},
+		color.RGBA{0x45, 0x34, 0x7f, 0xff},
+		color.RGBA{0x45, 0x35, 0x80, 0xff},
+		color.RGBA{0x45, 0x36, 0x81, 0xff},
+		color.RGBA{0x44, 0x37, 0x81, 0xff},
+		color.RGBA{0x44, 0x39, 0x82, 0xff},
+		color.RGBA{0x43, 0x3a, 0x83, 0xff},
+		color.RGBA{0x43, 0x3b, 0x83, 0xff},
+		color.RGBA{0x43, 0x3c, 0x84, 0xff},
+		color.RGBA{0x42, 0x3d, 0x84, 0xff},
+		color.RGBA{0x42, 0x3e, 0x85, 0xff},
+		color.RGBA{0x42, 0x40, 0x85, 0xff},
+		color.RGBA{0x41, 0x41, 0x86, 0xff},
+		color.RGBA{0x41, 0x42, 0x86, 0xff},
+		color.RGBA{0x40, 0x43, 0x87, 0xff},
+		color.RGBA{0x40, 0x44, 0x87, 0xff},
+		color.RGBA{0x3f, 0x45, 0x87, 0xff},
+		color.RGBA{0x3f, 0x47, 0x88, 0xff},
+		color.RGBA{0x3e, 0x48, 0x88, 0xff},
+		color.RGBA{0x3e, 0x49, 0x89, 0xff},
+		color.RGBA{0x3d, 0x4a, 0x89, 0xff},
+		color.RGBA{0x3d, 0x4b, 0x89, 0xff},
+		color.RGBA{0x3d, 0x4c, 0x89, 0xff},
+		color.RGBA{0x3c, 0x4d, 0x8a, 0xff},
+		color.RGBA{0x3c, 0x4e, 0x8a, 0xff},
+		color.RGBA{0x3b, 0x50, 0x8a, 0xff},
+		color.RGBA{0x3b, 0x51, 0x8a, 0xff},
+		color.RGBA{0x3a, 0x52, 0x8b, 0xff},
+		color.RGBA{0x3a, 0x53, 0x8b, 0xff},
+		color.RGBA{0x39, 0x54, 0x8b, 0xff},
+		color.RGBA{0x39, 0x55, 0x8b, 0xff},
+		color.RGBA{0x38, 0x56, 0x8b, 0xff},
+		color.RGBA{0x38, 0x57, 0x8c, 0xff},
+		color.RGBA{0x37, 0x58, 0x8c, 0xff},
+		color.RGBA{0x37, 0x59, 0x8c, 0xff},
+		color.RGBA{0x36, 0x5a, 0x8c, 0xff},
+		color.RGBA{0x36, 0x5b, 0x8c, 0xff},
+		color.RGBA{0x35, 0x5c, 0x8c, 0xff},
+		color.RGBA{0x35, 0x5d, 0x8c, 0xff},
+		color.RGBA{0x34, 0x5e, 0x8d, 0xff},
+		color.RGBA{0x34, 0x5f, 0x8d, 0xff},
+		color.RGBA{0x33, 0x60, 0x8d, 0xff},
+		color.RGBA{0x33, 0x61, 0x8d, 0xff},
+		color.RGBA{0x32, 0x62, 0x8d, 0xff},
+		color.RGBA{0x32, 0x63, 0x8d, 0xff},
+		color.RGBA{0x31, 0x64, 0x8d, 0xff},
+		color.RGBA{0x31, 0x65, 0x8d, 0xff},
+		color.RGBA{0x31, 0x66, 0x8d, 0xff},
+		color.RGBA{0x30, 0x67, 0x8d, 0xff},
+		color.RGBA{0x30, 0x68, 0x8d, 0xff},
+		color.RGBA{0x2f, 0x69, 0x8d, 0xff},
+		color.RGBA{0x2f, 0x6a, 0x8d, 0xff},
+		color.RGBA{0x2e, 0x6b, 0x8e, 0xff},
+		color.RGBA{0x2e, 0x6c, 0x8e, 0xff},
+		color.RGBA{0x2e, 0x6d, 0x8e, 0xff},
+		color.RGBA{0x2d, 0x6e, 0x8e, 0xff},
+		color.RGBA{0x2d, 0x6f, 0x8e, 0xff},
+		color.RGBA{0x2c, 0x70, 0x8e, 0xff},
+		color.RGBA{0x2c, 0x71, 0x8e, 0xff},
+		color.RGBA{0x2c, 0x72, 0x8e, 0xff},
+		color.RGBA{0x2b, 0x73, 0x8e, 0xff},
+		color.RGBA{0x2b, 0x74, 0x8e, 0xff},
+		color.RGBA{0x2a, 0x75, 0x8e, 0xff},
+		color.RGBA{0x2a, 0x76, 0x8e, 0xff},
+		color.RGBA{0x2a, 0x77, 0x8e, 0xff},
+		color.RGBA{0x29, 0x78, 0x8e, 0xff},
+		color.RGBA{0x29, 0x79, 0x8e, 0xff},
+		color.RGBA{0x28, 0x7a, 0x8e, 0xff},
+		color.RGBA{0x28, 0x7a, 0x8e, 0xff},
+		color.RGBA{0x28, 0x7b, 0x8e, 0xff},
+		color.RGBA{0x27, 0x7c, 0x8e, 0xff},
+		color.RGBA{0x27, 0x7d, 0x8e, 0xff},
+		color.RGBA{0x27, 0x7e, 0x8e, 0xff},
+		color.RGBA{0x26, 0x7f, 0x8e, 0xff},
+		color.RGBA{0x26, 0x80, 0x8e, 0xff},
+		color.RGBA{0x26, 0x81, 0x8e, 0xff},
+		color.RGBA{0x25, 0x82, 0x8e, 0xff},
+		color.RGBA{0x25, 0x83, 0x8d, 0xff},
+		color.RGBA{0x24, 0x84, 0x8d, 0xff},
+		color.RGBA{0x24, 0x85, 0x8d, 0xff},
+		color.RGBA{0x24, 0x86, 0x8d, 0xff},
+		color.RGBA{0x23, 0x87, 0x8d, 0xff},
+		color.RGBA{0x23, 0x88, 0x8d, 0xff},
+		color.RGBA{0x23, 0x89, 0x8d, 0xff},
+		color.RGBA{0x22, 0x89, 0x8d, 0xff},
+		color.RGBA{0x22, 0x8a, 0x8d, 0xff},
+		color.RGBA{0x22, 0x8b, 0x8d, 0xff},
+		color.RGBA{0x21, 0x8c, 0x8d, 0xff},
+		color.RGBA{0x21, 0x8d, 0x8c, 0xff},
+		color.RGBA{0x21, 0x8e, 0x8c, 0xff},
+		color.RGBA{0x20, 0x8f, 0x8c, 0xff},
+		color.RGBA{0x20, 0x90, 0x8c, 0xff},
+		color.RGBA{0x20, 0x91, 0x8c, 0xff},
+		color.RGBA{0x1f, 0x92, 0x8c, 0xff},
+		color.RGBA{0x1f, 0x93, 0x8b, 0xff},
+		color.RGBA{0x1f, 0x94, 0x8b, 0xff},
+		color.RGBA{0x1f, 0x95, 0x8b, 0xff},
+		color.RGBA{0x1f, 0x96, 0x8b, 0xff},
+		color.RGBA{0x1e, 0x97, 0x8a, 0xff},
+		color.RGBA{0x1e, 0x98, 0x8a, 0xff},
+		color.RGBA{0x1e, 0x99, 0x8a, 0xff},
+		color.RGBA{0x1e, 0x99, 0x8a, 0xff},
+		color.RGBA{0x1e, 0x9a, 0x89, 0xff},
+		color.RGBA{0x1e, 0x9b, 0x89, 0xff},
+		color.RGBA{0x1e, 0x9c, 0x89, 0xff},
+		color.RGBA{0x1e, 0x9d, 0x88, 0xff},
+		color.RGBA{0x1e, 0x9e, 0x88, 0xff},
+		color.RGBA{0x1e, 0x9f, 0x88, 0xff},
+		color.RGBA{0x1e, 0xa0, 0x87, 0xff},
+		color.RGBA{0x1f, 0xa1, 0x87, 0xff},
+		color.RGBA{0x1f, 0xa2, 0x86, 0xff},
+		color.RGBA{0x1f, 0xa3, 0x86, 0xff},
+		color.RGBA{0x20, 0xa4, 0x85, 0xff},
+		color.RGBA{0x20, 0xa5, 0x85, 0xff},
+		color.RGBA{0x21, 0xa6, 0x85, 0xff},
+		color.RGBA{0x21, 0xa7, 0x84, 0xff},
+		color.RGBA{0x22, 0xa7, 0x84, 0xff},
+		color.RGBA{0x23, 0xa8, 0x83, 0xff},
+		color.RGBA{0x23, 0xa9, 0x82, 0xff},
+		color.RGBA{0x24, 0xaa, 0x82, 0xff},
+		color.RGBA{0x25, 0xab, 0x81, 0xff},
+		color.RGBA{0x26, 0xac, 0x81, 0xff},
+		color.RGBA{0x27, 0xad, 0x80, 0xff},
+		color.RGBA{0x28, 0xae, 0x7f, 0xff},
+		color.RGBA{0x29, 0xaf, 0x7f, 0xff},
+		color.RGBA{0x2a, 0xb0, 0x7e, 0xff},
+		color.RGBA{0x2b, 0xb1, 0x7d, 0xff},
+		color.RGBA{0x2c, 0xb1, 0x7d, 0xff},
+		color.RGBA{0x2e, 0xb2, 0x7c, 0xff},
+		color.RGBA{0x2f, 0xb3, 0x7b, 0xff},
+		color.RGBA{0x30, 0xb4, 0x7a, 0xff},
+		color.RGBA{0x32, 0xb5, 0x7a, 0xff},
+		color.RGBA{0x33, 0xb6, 0x79, 0xff},
+		color.RGBA{0x35, 0xb7, 0x78, 0xff},
+		color.RGBA{0x36, 0xb8, 0x77, 0xff},
+		color.RGBA{0x38, 0xb9, 0x76, 0xff},
+		color.RGBA{0x39, 0xb9, 0x76, 0xff},
+		color.RGBA{0x3b, 0xba, 0x75, 0xff},
+		color.RGBA{0x3d, 0xbb, 0x74, 0xff},
+		color.RGBA{0x3e, 0xbc, 0x73, 0xff},
+		color.RGBA{0x40, 0xbd, 0x72, 0xff},
+		color.RGBA{0x42, 0xbe, 0x71, 0xff},
+		color.RGBA{0x44, 0xbe, 0x70, 0xff},
+		color.RGBA{0x45, 0xbf, 0x6f, 0xff},
+		color.RGBA{0x47, 0xc0, 0x6e, 0xff},
+		color.RGBA{0x49, 0xc1, 0x6d, 0xff},
+		color.RGBA{0x4b, 0xc2, 0x6c, 0xff},
+		color.RGBA{0x4d, 0xc2, 0x6b, 0xff},
+		color.RGBA{0x4f, 0xc3, 0x69, 0xff},
+		color.RGBA{0x51, 0xc4, 0x68, 0xff},
+		color.RGBA{0x53, 0xc5, 0x67, 0xff},
+		color.RGBA{0x55, 0xc6, 0x66, 0xff},
+		color.RGBA{0x57, 0xc6, 0x65, 0xff},
+		color.RGBA{0x59, 0xc7, 0x64, 0xff},
+		color.RGBA{0x5b, 0xc8, 0x62, 0xff},
+		color.RGBA{0x5e, 0xc9, 0x61, 0xff},
+		color.RGBA{0x60, 0xc9, 0x60, 0xff},
+		color.RGBA{0x62, 0xca, 0x5f, 0xff},
+		color.RGBA{0x64, 0xcb, 0x5d, 0xff},
+		color.RGBA{0x67, 0xcc, 0x5c, 0xff},
+		color.RGBA{0x69, 0xcc, 0x5b, 0xff},
+		color.RGBA{0x6b, 0xcd, 0x59, 0xff},
+		color.RGBA{0x6d, 0xce, 0x58, 0xff},
+		color.RGBA{0x70, 0xce, 0x56, 0xff},
+		color.RGBA{0x72, 0xcf, 0x55, 0xff},
+		color.RGBA{0x74, 0xd0, 0x54, 0xff},
+		color.RGBA{0x77, 0xd0, 0x52, 0xff},
+		color.RGBA{0x79, 0xd1, 0x51, 0xff},
+		color.RGBA{0x7c, 0xd2, 0x4f, 0xff},
+		color.RGBA{0x7e, 0xd2, 0x4e, 0xff},
+		color.RGBA{0x81, 0xd3, 0x4c, 0xff},
+		color.RGBA{0x83, 0xd3, 0x4b, 0xff},
+		color.RGBA{0x86, 0xd4, 0x49, 0xff},
+		color.RGBA{0x88, 0xd5, 0x47, 0xff},
+		color.RGBA{0x8b, 0xd5, 0x46, 0xff},
+		color.RGBA{0x8d, 0xd6, 0x44, 0xff},
+		color.RGBA{0x90, 0xd6, 0x43, 0xff},
+		color.RGBA{0x92, 0xd7, 0x41, 0xff},
+		color.RGBA{0x95, 0xd7, 0x3f, 0xff},
+		color.RGBA{0x97, 0xd8, 0x3e, 0xff},
+		color.RGBA{0x9a, 0xd8, 0x3c, 0xff},
+		color.RGBA{0x9d, 0xd9, 0x3a, 0xff},
+		color.RGBA{0x9f, 0xd9, 0x38, 0xff},
+		color.RGBA{0xa2, 0xda, 0x37, 0xff},
+		color.RGBA{0xa5, 0xda, 0x35, 0xff},
+		color.RGBA{0xa7, 0xdb, 0x33, 0xff},
+		color.RGBA{0xaa, 0xdb, 0x32, 0xff},
+		color.RGBA{0xad, 0xdc, 0x30, 0xff},
+		color.RGBA{0xaf, 0xdc, 0x2e, 0xff},
+		color.RGBA{0xb2, 0xdd, 0x2c, 0xff},
+		color.RGBA{0xb5, 0xdd, 0x2b, 0xff},
+		color.RGBA{0xb7, 0xdd, 0x29, 0xff},
+		color.RGBA{0xba, 0xde, 0x27, 0xff},
+		color.RGBA{0xbd, 0xde, 0x26, 0xff},
+		color.RGBA{0xbf, 0xdf, 0x24, 0xff},
+		color.RGBA{0xc2, 0xdf, 0x22, 0xff},
+		color.RGBA{0xc5, 0xdf, 0x21, 0xff},
+		color.RGBA{0xc7, 0xe0, 0x1f, 0xff},
+		color.RGBA{0xca, 0xe0, 0x1e, 0xff},
+		color.RGBA{0xcd, 0xe0, 0x1d, 0xff},
+		color.RGBA{0xcf, 0xe1, 0x1c, 0xff},
+		color.RGBA{0xd2, 0xe1, 0x1b, 0xff},
+		color.RGBA{0xd4, 0xe1, 0x1a, 0xff},
+		color.RGBA{0xd7, 0xe2, 0x19, 0xff},
+		color.RGBA{0xda, 0xe2, 0x18, 0xff},
+		color.RGBA{0xdc, 0xe2, 0x18, 0xff},
+		color.RGBA{0xdf, 0xe3, 0x18, 0xff},
+		color.RGBA{0xe1, 0xe3, 0x18, 0xff},
+		color.RGBA{0xe4, 0xe3, 0x18, 0xff},
+		color.RGBA{0xe7, 0xe4, 0x19, 0xff},
+		color.RGBA{0xe9, 0xe4, 0x19, 0xff},
+		color.RGBA{0xec, 0xe4, 0x1a, 0xff},
+		color.RGBA{0xee, 0xe5, 0x1b, 0xff},
+		color.RGBA{0xf1, 0xe5, 0x1c, 0xff},
+		color.RGBA{0xf3, 0xe5, 0x1e, 0xff},
+		color.RGBA{0xf6, 0xe6, 0x1f, 0xff},
+		color.RGBA{0xf8, 0xe6, 0x21, 0xff},
+		color.RGBA{0xfa, 0xe6, 0x22, 0xff},
+		color.RGBA{0xfd, 0xe7, 0x24, 0xff},
+	}
 )
diff --git a/example/example.go b/example/example.go
index 6514e56..48f971d 100644
--- a/example/example.go
+++ b/example/example.go
@@ -12,8 +12,7 @@ func formula1(x, y float64) (float64, float64) {
 
 func main() {
 	c := generativeart.NewCanva(1600, 1600, 2, 2)
-	c.FillBackgroud(generativeart.White)
-	g := generativeart.NewWave(formula1)
-	g.GenerativePolar(c, generativeart.DarkSalmon)
-	c.ToPng("g1.png")
+	c.FillBackground()
+	c.Draw(generativeart.NewWave(formula1))
+	c.ToPNG("g1.png")
 }
diff --git a/example/example_gridsquare.go b/example/example_gridsquare.go
new file mode 100644
index 0000000..e5d89f9
--- /dev/null
+++ b/example/example_gridsquare.go
@@ -0,0 +1,16 @@
+package main
+
+import (
+	"generativeart"
+	"math/rand"
+	"time"
+)
+
+func main() {
+	rand.Seed(time.Now().Unix())
+	c := generativeart.NewCanva(600, 600, 1, 1)
+	c.SetBackground(generativeart.Viridis[rand.Intn(255)])
+	c.SetColorSchema(generativeart.Viridis)
+	c.Draw(generativeart.NewGirdSquares())
+	c.ToPNG("gsquare.png")
+}
diff --git a/example/example_maze.go b/example/example_maze.go
index 90dc299..7e3f830 100644
--- a/example/example_maze.go
+++ b/example/example_maze.go
@@ -1,11 +1,17 @@
 package main
 
-import "generativeart"
+import (
+	"generativeart"
+	"math/rand"
+	"time"
+)
 
 func main() {
+	rand.Seed(time.Now().Unix())
 	c := generativeart.NewCanva(800, 800, 2, 2)
-	c.FillBackgroud(generativeart.Azure)
-	g := generativeart.NewMaze()
-	g.Generative(c, generativeart.Tomato)
-	c.ToPng("maze.png")
+	c.SetBackground(generativeart.Azure)
+	c.SetForeground(generativeart.Tomato)
+	c.FillBackground()
+	c.Draw(generativeart.NewMaze())
+	c.ToPNG("maze.png")
 }
diff --git a/generativeart.go b/generativeart.go
index b41ef09..8998c19 100644
--- a/generativeart.go
+++ b/generativeart.go
@@ -17,6 +17,22 @@ type canva struct {
 	height, width int
 	xaixs, yaixs  float64
 	img           *image.RGBA
+	opts          Options
+}
+
+type Options struct {
+	background       color.RGBA
+	foreground       color.RGBA
+	lineColor        color.RGBA
+	lineWidth        float64
+	colorSchema      []color.RGBA
+	isPolarCoodinate bool
+	step             int
+	nIters           int
+	alpha            int
+	rectLenSide      int
+	radius           float64
+	decay            float64
 }
 
 // NewCanva returns a canva.
@@ -27,16 +43,87 @@ func NewCanva(h, w int, x, y float64) *canva {
 		xaixs:  x,
 		yaixs:  y,
 		img:    image.NewRGBA(image.Rect(0, 0, h, w)),
+		// Set some defaults value
+		opts: Options{
+			background:       Azure,
+			foreground:       MistyRose,
+			lineColor:        Tomato,
+			lineWidth:        3,
+			colorSchema:      Plasma,
+			isPolarCoodinate: false,
+			step:             24,
+			nIters:           20,
+			alpha:            30,
+			rectLenSide:      10,
+			radius:           1.0,
+			decay:            0.2,
+		},
 	}
 }
 
-// FillBackgroud fills the backgroud of the canva.
-func (c *canva) FillBackgroud(rgba color.RGBA) {
-	draw.Draw(c.img, c.img.Bounds(), &image.Uniform{rgba}, image.ZP, draw.Src)
+func (c *canva) SetOptions(opts Options) {
+	c.opts = opts
+}
+
+func (c *canva) SetBackground(rgba color.RGBA) {
+	c.opts.background = rgba
+}
+
+func (c *canva) SetForeground(rgba color.RGBA) {
+	c.opts.foreground = rgba
+}
+
+func (c *canva) SetColorSchema(rgbas []color.RGBA) {
+	c.opts.colorSchema = rgbas
+}
+
+func (c *canva) SetLineColor(rgba color.RGBA) {
+	c.opts.lineColor = rgba
+}
+
+func (c *canva) SetLineWidth(lw float64) {
+	c.opts.lineWidth = lw
+}
+
+func (c *canva) SetPolarCoodinate() {
+	c.opts.isPolarCoodinate = true
+}
+
+func (c *canva) SetStep(step int) {
+	c.opts.step = step
+}
+
+func (c *canva) SetIterations(nIters int) {
+	c.opts.nIters = nIters
+}
+
+func (c *canva) SetAlpha(alpha int) {
+	c.opts.alpha = alpha
+}
+
+func (c *canva) SetRectLenSide(l int) {
+	c.opts.rectLenSide = l
+}
+
+func (c *canva) SetRadius(r float64) {
+	c.opts.radius = r
+}
+
+func (c *canva) SetDecay(d float64) {
+	c.opts.decay = d
+}
+
+func (c *canva) Draw(e Engine) {
+	e.Generative(c)
+}
+
+// FillBackground fills the background of the canva.
+func (c *canva) FillBackground() {
+	draw.Draw(c.img, c.img.Bounds(), &image.Uniform{c.opts.background}, image.ZP, draw.Src)
 }
 
 // ToPng saves the image to local with PNG format.
-func (c *canva) ToPng(fpath string) error {
+func (c *canva) ToPNG(fpath string) error {
 	f, err := os.Create(fpath)
 	if err != nil {
 		return err
@@ -54,7 +141,7 @@ func (c *canva) ToPng(fpath string) error {
 }
 
 // ToJpeg saves the image to local with Jpeg format.
-func (c *canva) ToJpeg(path string) error {
+func (c *canva) ToJPEG(path string) error {
 	f, err := os.Create(path)
 	if err != nil {
 		return err
diff --git a/maze.go b/maze.go
index 02cc643..cc750b3 100644
--- a/maze.go
+++ b/maze.go
@@ -1,7 +1,6 @@
 package generativeart
 
 import (
-	"image/color"
 	"math/rand"
 
 	"github.com/fogleman/gg"
@@ -15,21 +14,17 @@ func NewMaze() *maze {
 }
 
 // Generative draws a random maze image.
-func (m *maze) Generative(c *canva, rgba color.RGBA) {
+func (m *maze) Generative(c *canva) {
 	ctex := gg.NewContextForRGBA(c.img)
-	ctex.SetColor(rgba)
-	ctex.SetLineWidth(3.0)
-	step := 20
+	ctex.SetColor(c.opts.background)
+	ctex.SetLineWidth(c.opts.lineWidth)
+	step := c.opts.step
 	for x := 0; x < c.width; x += step {
 		for y := 0; y < c.height; y += step {
 			if rand.Float32() > 0.5 {
 				ctex.DrawLine(float64(x), float64(y), float64(x+step), float64(y+step))
-
-				//ctex.Stroke()
 			} else {
 				ctex.DrawLine(float64(x+step), float64(y), float64(x), float64(y+step))
-				ctex.SetLineWidth(3.0)
-				//ctex.Stroke()
 			}
 			ctex.Stroke()
 		}
diff --git a/squaregrid.go b/squaregrid.go
new file mode 100644
index 0000000..ce14bb8
--- /dev/null
+++ b/squaregrid.go
@@ -0,0 +1,54 @@
+package generativeart
+
+import (
+	"github.com/fogleman/gg"
+	"math/rand"
+)
+
+type girdSquares struct{}
+
+// NewGirdSquares returns a grid squares generator.
+func NewGirdSquares() *girdSquares {
+	return &girdSquares{}
+}
+
+// Generative draws a grid squares image.
+func (g *girdSquares) Generative(c *canva) {
+	ctex := gg.NewContextForRGBA(c.img)
+	step := c.opts.step
+	rectSize := c.opts.rectLenSide
+
+	for x := 0; x < c.width; x += step {
+		for y := 0; y < c.height; y += step {
+			cl := c.opts.colorSchema[rand.Intn(255)]
+
+			x0 := float64(x)
+			y0 := float64(y)
+			s := float64(rectSize)
+
+			theta := rand.Intn(360) + 1
+			for i := 0; i < c.opts.nIters; i++ {
+				ctex.Push()
+
+				ctex.Translate(x0+float64(step/2), y0+float64(step/2))
+				ctex.Rotate(gg.Radians(float64(theta * i)))
+
+				ctex.Scale(s, s)
+
+				ctex.LineTo(-0.5, 0.5)
+				ctex.LineTo(0.5, 0.5)
+				ctex.LineTo(0.5, -0.5)
+				ctex.LineTo(-0.5, -0.5)
+				ctex.LineTo(-0.5, 0.5)
+
+				ctex.SetLineWidth(c.opts.lineWidth)
+				ctex.SetColor(c.opts.lineColor)
+				ctex.StrokePreserve()
+				ctex.SetRGBA255(int(cl.R), int(cl.G), int(cl.B), c.opts.alpha)
+				ctex.Fill()
+				ctex.Pop()
+				s = s - c.opts.decay*float64(rectSize)
+			}
+		}
+	}
+}
diff --git a/wave.go b/wave.go
index 042d1ec..6889963 100644
--- a/wave.go
+++ b/wave.go
@@ -1,7 +1,6 @@
 package generativeart
 
 import (
-	"image/color"
 	"math"
 
 	"github.com/fogleman/gg"
@@ -18,34 +17,26 @@ func NewWave(fn Formula) *wave {
 	return &wave{fn: fn}
 }
 
-// GenerativePolar draws the image in polar coordinate system.
-func (w *wave) GenerativePolar(c *canva, rgba color.RGBA) {
+// Generative draws the image.
+func (w *wave) Generative(c *canva) {
 	ctex := gg.NewContextForRGBA(c.img)
 	for x := -math.Pi; x <= math.Pi; x += 0.01 {
 		for y := -math.Pi; y <= math.Pi; y += 0.01 {
 			xi, yi := w.fn(x, y)
-			i, j := ConvertCartesianToPolarPixel(xi, yi, c.xaixs, c.yaixs, c.height, c.width)
-			if i < 0 || i > c.width-1 || j < 0 || j > c.height-1 {
-				continue
+			var i, j int
+			if c.opts.isPolarCoodinate {
+				i, j = ConvertCartesianToPolarPixel(xi, yi, c.xaixs, c.yaixs, c.height, c.width)
+			} else {
+				i, j = ConvertCartesianToPixel(xi, yi, c.xaixs, c.yaixs, c.height, c.width)
 			}
-			ctex.DrawCircle(float64(i), float64(j), 1.0)
-			ctex.SetColor(rgba)
-			ctex.Fill()
-			//c.img.Set(i, j, rgba)
-		}
-	}
-}
 
-// Generative draws the image in cartesian coordinate system.
-func (w *wave) Generative(c *canva, rgba color.RGBA) {
-	for x := -math.Pi; x <= math.Pi; x += 0.002 {
-		for y := -math.Pi; y <= math.Pi; y += 0.002 {
-			xi, yi := w.fn(x, y)
-			i, j := ConvertCartesianToPixel(xi, yi, c.xaixs, c.yaixs, c.height, c.width)
 			if i < 0 || i > c.width-1 || j < 0 || j > c.height-1 {
 				continue
 			}
-			c.img.Set(i, j, rgba)
+
+			ctex.DrawCircle(float64(i), float64(j), c.opts.radius)
+			ctex.SetColor(c.opts.foreground)
+			ctex.Fill()
 		}
 	}
 }