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@@ -1,487 +0,0 @@
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-// Copyright 2014 The Gogs Authors. All rights reserved.
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-// Use of this source code is governed by a MIT-style
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-// license that can be found in the LICENSE file.
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-
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-package captcha
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-
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-import (
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- "bytes"
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- "image"
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- "image/color"
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- "image/png"
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- "io"
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- "math"
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-)
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-
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-const (
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- fontWidth = 11
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- fontHeight = 18
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- blackChar = 1
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-
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- // Standard width and height of a captcha image.
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- stdWidth = 240
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- stdHeight = 80
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- // Maximum absolute skew factor of a single digit.
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- maxSkew = 0.7
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- // Number of background circles.
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- circleCount = 20
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-)
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-
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-var font = [][]byte{
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- { // 0
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- 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0,
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- 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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- 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0,
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- 0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0,
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- 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0,
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- 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1,
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- 0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0,
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- 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0,
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- 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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- 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0,
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- },
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- { // 1
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- 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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- 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0,
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- 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0,
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- 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0,
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- 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0,
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- 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0,
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- 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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- 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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- 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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- 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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- 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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- 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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- 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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- 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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- 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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- 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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- 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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- 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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- },
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- { // 2
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- 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0,
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- 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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- 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0,
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- 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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- 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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- 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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- 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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- 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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- 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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- 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0,
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- 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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- 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0,
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- 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0,
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- 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0,
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- 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0,
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- 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
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- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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- },
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- { // 3
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- 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0,
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- 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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- 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0,
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- 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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- 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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- 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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- 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0,
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- 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0,
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- 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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- 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
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- 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
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- 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
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- 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
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- 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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- 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0,
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- },
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- { // 4
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- 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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- 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0,
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- 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0,
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- 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0,
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- 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0,
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- 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0,
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- 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0,
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- 0, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0,
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- 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0,
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- 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0,
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- 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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- 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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- 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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- 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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- 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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- 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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- },
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- { // 5
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- 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
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- 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
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- 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
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- 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
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- 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
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- 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
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- 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0,
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- 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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- 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
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- 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
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- 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0,
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- 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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- 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0,
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- },
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- { // 6
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- 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0,
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- 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0,
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- 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0,
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- 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
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- 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
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- 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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- 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0,
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- 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0,
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- 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0,
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- 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1,
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- 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0,
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- 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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- 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0,
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- },
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- { // 7
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- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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- 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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- 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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- 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
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- 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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- 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
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- 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0,
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- 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0,
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- 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0,
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- 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
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- 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0,
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- 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0,
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- 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0,
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- 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0,
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- 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0,
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- 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0,
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- },
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- { // 8
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- 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0,
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- 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0,
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- 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1,
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- 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
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- 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
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- 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
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- 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0,
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- 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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- 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0,
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- 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0,
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- 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0,
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- 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0,
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- 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
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- 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0,
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- },
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- { // 9
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- 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0,
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- 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
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- 0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0,
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- 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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- 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1,
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- 0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1,
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- 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1,
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- 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1,
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- 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
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- 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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- 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
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- 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
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- 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0,
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- 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0,
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- 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
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- },
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-}
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-
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-type Image struct {
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- *image.Paletted
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- numWidth int
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- numHeight int
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- dotSize int
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-}
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-
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-var prng = &siprng{}
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-
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-// randIntn returns a pseudorandom non-negative int in range [0, n).
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-func randIntn(n int) int {
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- return prng.Intn(n)
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-}
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-
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-// randInt returns a pseudorandom int in range [from, to].
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-func randInt(from, to int) int {
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- return prng.Intn(to+1-from) + from
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-}
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-
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-// randFloat returns a pseudorandom float64 in range [from, to].
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-func randFloat(from, to float64) float64 {
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- return (to-from)*prng.Float64() + from
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-}
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-
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-func randomPalette() color.Palette {
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- p := make([]color.Color, circleCount+1)
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- // Transparent color.
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- p[0] = color.RGBA{0xFF, 0xFF, 0xFF, 0x00}
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- // Primary color.
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- prim := color.RGBA{
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- uint8(randIntn(129)),
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- uint8(randIntn(129)),
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- uint8(randIntn(129)),
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- 0xFF,
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- }
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- p[1] = prim
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- // Circle colors.
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- for i := 2; i <= circleCount; i++ {
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- p[i] = randomBrightness(prim, 255)
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- }
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- return p
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-}
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-
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-// NewImage returns a new captcha image of the given width and height with the
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-// given digits, where each digit must be in range 0-9.
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-func NewImage(digits []byte, width, height int) *Image {
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- m := new(Image)
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- m.Paletted = image.NewPaletted(image.Rect(0, 0, width, height), randomPalette())
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- m.calculateSizes(width, height, len(digits))
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- // Randomly position captcha inside the image.
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- maxx := width - (m.numWidth+m.dotSize)*len(digits) - m.dotSize
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- maxy := height - m.numHeight - m.dotSize*2
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- var border int
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- if width > height {
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- border = height / 5
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- } else {
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- border = width / 5
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- }
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- x := randInt(border, maxx-border)
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- y := randInt(border, maxy-border)
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- // Draw digits.
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- for _, n := range digits {
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- m.drawDigit(font[n], x, y)
|
|
|
- x += m.numWidth + m.dotSize
|
|
|
- }
|
|
|
- // Draw strike-through line.
|
|
|
- m.strikeThrough()
|
|
|
- // Apply wave distortion.
|
|
|
- m.distort(randFloat(5, 10), randFloat(100, 200))
|
|
|
- // Fill image with random circles.
|
|
|
- m.fillWithCircles(circleCount, m.dotSize)
|
|
|
- return m
|
|
|
-}
|
|
|
-
|
|
|
-// encodedPNG encodes an image to PNG and returns
|
|
|
-// the result as a byte slice.
|
|
|
-func (m *Image) encodedPNG() []byte {
|
|
|
- var buf bytes.Buffer
|
|
|
- if err := png.Encode(&buf, m.Paletted); err != nil {
|
|
|
- panic(err.Error())
|
|
|
- }
|
|
|
- return buf.Bytes()
|
|
|
-}
|
|
|
-
|
|
|
-// WriteTo writes captcha image in PNG format into the given writer.
|
|
|
-func (m *Image) WriteTo(w io.Writer) (int64, error) {
|
|
|
- n, err := w.Write(m.encodedPNG())
|
|
|
- return int64(n), err
|
|
|
-}
|
|
|
-
|
|
|
-func (m *Image) calculateSizes(width, height, ncount int) {
|
|
|
- // Goal: fit all digits inside the image.
|
|
|
- var border int
|
|
|
- if width > height {
|
|
|
- border = height / 4
|
|
|
- } else {
|
|
|
- border = width / 4
|
|
|
- }
|
|
|
- // Convert everything to floats for calculations.
|
|
|
- w := float64(width - border*2)
|
|
|
- h := float64(height - border*2)
|
|
|
- // fw takes into account 1-dot spacing between digits.
|
|
|
- fw := float64(fontWidth + 1)
|
|
|
- fh := float64(fontHeight)
|
|
|
- nc := float64(ncount)
|
|
|
- // Calculate the width of a single digit taking into account only the
|
|
|
- // width of the image.
|
|
|
- nw := w / nc
|
|
|
- // Calculate the height of a digit from this width.
|
|
|
- nh := nw * fh / fw
|
|
|
- // Digit too high?
|
|
|
- if nh > h {
|
|
|
- // Fit digits based on height.
|
|
|
- nh = h
|
|
|
- nw = fw / fh * nh
|
|
|
- }
|
|
|
- // Calculate dot size.
|
|
|
- m.dotSize = int(nh / fh)
|
|
|
- // Save everything, making the actual width smaller by 1 dot to account
|
|
|
- // for spacing between digits.
|
|
|
- m.numWidth = int(nw) - m.dotSize
|
|
|
- m.numHeight = int(nh)
|
|
|
-}
|
|
|
-
|
|
|
-func (m *Image) drawHorizLine(fromX, toX, y int, colorIdx uint8) {
|
|
|
- for x := fromX; x <= toX; x++ {
|
|
|
- m.SetColorIndex(x, y, colorIdx)
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-func (m *Image) drawCircle(x, y, radius int, colorIdx uint8) {
|
|
|
- f := 1 - radius
|
|
|
- dfx := 1
|
|
|
- dfy := -2 * radius
|
|
|
- xo := 0
|
|
|
- yo := radius
|
|
|
-
|
|
|
- m.SetColorIndex(x, y+radius, colorIdx)
|
|
|
- m.SetColorIndex(x, y-radius, colorIdx)
|
|
|
- m.drawHorizLine(x-radius, x+radius, y, colorIdx)
|
|
|
-
|
|
|
- for xo < yo {
|
|
|
- if f >= 0 {
|
|
|
- yo--
|
|
|
- dfy += 2
|
|
|
- f += dfy
|
|
|
- }
|
|
|
- xo++
|
|
|
- dfx += 2
|
|
|
- f += dfx
|
|
|
- m.drawHorizLine(x-xo, x+xo, y+yo, colorIdx)
|
|
|
- m.drawHorizLine(x-xo, x+xo, y-yo, colorIdx)
|
|
|
- m.drawHorizLine(x-yo, x+yo, y+xo, colorIdx)
|
|
|
- m.drawHorizLine(x-yo, x+yo, y-xo, colorIdx)
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-func (m *Image) fillWithCircles(n, maxradius int) {
|
|
|
- maxx := m.Bounds().Max.X
|
|
|
- maxy := m.Bounds().Max.Y
|
|
|
- for i := 0; i < n; i++ {
|
|
|
- colorIdx := uint8(randInt(1, circleCount-1))
|
|
|
- r := randInt(1, maxradius)
|
|
|
- m.drawCircle(randInt(r, maxx-r), randInt(r, maxy-r), r, colorIdx)
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-func (m *Image) strikeThrough() {
|
|
|
- maxx := m.Bounds().Max.X
|
|
|
- maxy := m.Bounds().Max.Y
|
|
|
- y := randInt(maxy/3, maxy-maxy/3)
|
|
|
- amplitude := randFloat(5, 20)
|
|
|
- period := randFloat(80, 180)
|
|
|
- dx := 2.0 * math.Pi / period
|
|
|
- for x := 0; x < maxx; x++ {
|
|
|
- xo := amplitude * math.Cos(float64(y)*dx)
|
|
|
- yo := amplitude * math.Sin(float64(x)*dx)
|
|
|
- for yn := 0; yn < m.dotSize; yn++ {
|
|
|
- r := randInt(0, m.dotSize)
|
|
|
- m.drawCircle(x+int(xo), y+int(yo)+(yn*m.dotSize), r/2, 1)
|
|
|
- }
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-func (m *Image) drawDigit(digit []byte, x, y int) {
|
|
|
- skf := randFloat(-maxSkew, maxSkew)
|
|
|
- xs := float64(x)
|
|
|
- r := m.dotSize / 2
|
|
|
- y += randInt(-r, r)
|
|
|
- for yo := 0; yo < fontHeight; yo++ {
|
|
|
- for xo := 0; xo < fontWidth; xo++ {
|
|
|
- if digit[yo*fontWidth+xo] != blackChar {
|
|
|
- continue
|
|
|
- }
|
|
|
- m.drawCircle(x+xo*m.dotSize, y+yo*m.dotSize, r, 1)
|
|
|
- }
|
|
|
- xs += skf
|
|
|
- x = int(xs)
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-func (m *Image) distort(amplude float64, period float64) {
|
|
|
- w := m.Bounds().Max.X
|
|
|
- h := m.Bounds().Max.Y
|
|
|
-
|
|
|
- oldm := m.Paletted
|
|
|
- newm := image.NewPaletted(image.Rect(0, 0, w, h), oldm.Palette)
|
|
|
-
|
|
|
- dx := 2.0 * math.Pi / period
|
|
|
- for x := 0; x < w; x++ {
|
|
|
- for y := 0; y < h; y++ {
|
|
|
- xo := amplude * math.Sin(float64(y)*dx)
|
|
|
- yo := amplude * math.Cos(float64(x)*dx)
|
|
|
- newm.SetColorIndex(x, y, oldm.ColorIndexAt(x+int(xo), y+int(yo)))
|
|
|
- }
|
|
|
- }
|
|
|
- m.Paletted = newm
|
|
|
-}
|
|
|
-
|
|
|
-func randomBrightness(c color.RGBA, max uint8) color.RGBA {
|
|
|
- minc := min3(c.R, c.G, c.B)
|
|
|
- maxc := max3(c.R, c.G, c.B)
|
|
|
- if maxc > max {
|
|
|
- return c
|
|
|
- }
|
|
|
- n := randIntn(int(max-maxc)) - int(minc)
|
|
|
- return color.RGBA{
|
|
|
- uint8(int(c.R) + n),
|
|
|
- uint8(int(c.G) + n),
|
|
|
- uint8(int(c.B) + n),
|
|
|
- uint8(c.A),
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-func min3(x, y, z uint8) (m uint8) {
|
|
|
- m = x
|
|
|
- if y < m {
|
|
|
- m = y
|
|
|
- }
|
|
|
- if z < m {
|
|
|
- m = z
|
|
|
- }
|
|
|
- return
|
|
|
-}
|
|
|
-
|
|
|
-func max3(x, y, z uint8) (m uint8) {
|
|
|
- m = x
|
|
|
- if y > m {
|
|
|
- m = y
|
|
|
- }
|
|
|
- if z > m {
|
|
|
- m = z
|
|
|
- }
|
|
|
- return
|
|
|
-}
|