Better builtin avatar generator (#17707)
This PR fixes the builtin avatar generator. 1. The random background color makes some images very dirty. So now we only use white background for avatars. 2. We use left-right mirror avatars to satisfy #14799 3. Fix a small padding error in the algorithm
This commit is contained in:
wxiaoguang
GitHub
parent
38347aa16f
commit
a8fd76557b
19 changed files with 417 additions and 376 deletions
|
|
@ -50,7 +50,7 @@ import (
|
|||
"bytes"
|
||||
"fmt"
|
||||
"image"
|
||||
"image/color/palette"
|
||||
"image/color"
|
||||
|
||||
_ "image/gif" // for processing gif images
|
||||
_ "image/jpeg" // for processing jpeg images
|
||||
|
|
@ -76,7 +76,7 @@ import (
|
|||
"bytes"
|
||||
"fmt"
|
||||
"image"
|
||||
"image/color/palette"
|
||||
"image/color"
|
||||
|
||||
_ "image/gif" // for processing gif images
|
||||
_ "image/jpeg" // for processing jpeg images
|
||||
|
|
|
|||
1
go.mod
1
go.mod
|
|
@ -63,7 +63,6 @@ require (
|
|||
github.com/hashicorp/go-version v1.3.1
|
||||
github.com/hashicorp/golang-lru v0.5.4
|
||||
github.com/huandu/xstrings v1.3.2
|
||||
github.com/issue9/identicon v1.2.0
|
||||
github.com/jaytaylor/html2text v0.0.0-20200412013138-3577fbdbcff7
|
||||
github.com/json-iterator/go v1.1.11
|
||||
github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51
|
||||
|
|
|
|||
4
go.sum
4
go.sum
|
|
@ -661,10 +661,6 @@ github.com/imdario/mergo v0.3.12 h1:b6R2BslTbIEToALKP7LxUvijTsNI9TAe80pLWN2g/HU=
|
|||
github.com/imdario/mergo v0.3.12/go.mod h1:jmQim1M+e3UYxmgPu/WyfjB3N3VflVyUjjjwH0dnCYA=
|
||||
github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
|
||||
github.com/influxdata/influxdb1-client v0.0.0-20191209144304-8bf82d3c094d/go.mod h1:qj24IKcXYK6Iy9ceXlo3Tc+vtHo9lIhSX5JddghvEPo=
|
||||
github.com/issue9/assert v1.4.1 h1:gUtOpMTeaE4JTe9kACma5foOHBvVt1p5XTFrULDwdXI=
|
||||
github.com/issue9/assert v1.4.1/go.mod h1:Yktk83hAVl1SPSYtd9kjhBizuiBIqUQyj+D5SE2yjVY=
|
||||
github.com/issue9/identicon v1.2.0 h1:ek+UcTTyMW/G0iNbLOAlrPC13eSzXTWhbJSs8PHhHGQ=
|
||||
github.com/issue9/identicon v1.2.0/go.mod h1:A9toNT0ky/1WP5iNFyDmrkNiYH6eX3HcN5V6uH0g0ec=
|
||||
github.com/jackc/chunkreader v1.0.0 h1:4s39bBR8ByfqH+DKm8rQA3E1LHZWB9XWcrz8fqaZbe0=
|
||||
github.com/jackc/chunkreader v1.0.0/go.mod h1:RT6O25fNZIuasFJRyZ4R/Y2BbhasbmZXF9QQ7T3kePo=
|
||||
github.com/jackc/chunkreader/v2 v2.0.0/go.mod h1:odVSm741yZoC3dpHEUXIqA9tQRhFrgOHwnPIn9lDKlk=
|
||||
|
|
|
|||
|
|
@ -8,16 +8,15 @@ import (
|
|||
"bytes"
|
||||
"fmt"
|
||||
"image"
|
||||
"image/color/palette"
|
||||
"image/color"
|
||||
|
||||
_ "image/gif" // for processing gif images
|
||||
_ "image/jpeg" // for processing jpeg images
|
||||
_ "image/png" // for processing png images
|
||||
|
||||
"code.gitea.io/gitea/modules/avatar/identicon"
|
||||
"code.gitea.io/gitea/modules/setting"
|
||||
"code.gitea.io/gitea/modules/util"
|
||||
|
||||
"github.com/issue9/identicon"
|
||||
"github.com/nfnt/resize"
|
||||
"github.com/oliamb/cutter"
|
||||
)
|
||||
|
|
@ -28,20 +27,8 @@ const AvatarSize = 290
|
|||
// RandomImageSize generates and returns a random avatar image unique to input data
|
||||
// in custom size (height and width).
|
||||
func RandomImageSize(size int, data []byte) (image.Image, error) {
|
||||
randExtent := len(palette.WebSafe) - 32
|
||||
integer, err := util.RandomInt(int64(randExtent))
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("util.RandomInt: %v", err)
|
||||
}
|
||||
colorIndex := int(integer)
|
||||
backColorIndex := colorIndex - 1
|
||||
if backColorIndex < 0 {
|
||||
backColorIndex = randExtent - 1
|
||||
}
|
||||
|
||||
// Define size, background, and forecolor
|
||||
imgMaker, err := identicon.New(size,
|
||||
palette.WebSafe[backColorIndex], palette.WebSafe[colorIndex:colorIndex+32]...)
|
||||
// we use white as background, and use dark colors to draw blocks
|
||||
imgMaker, err := identicon.New(size, color.White, identicon.DarkColors...)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("identicon.New: %v", err)
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,25 +1,26 @@
|
|||
// SPDX-License-Identifier: MIT
|
||||
// Copyright 2021 The Gitea Authors. All rights reserved.
|
||||
// Use of this source code is governed by a MIT-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// Copied and modified from https://github.com/issue9/identicon/ (MIT License)
|
||||
|
||||
package identicon
|
||||
|
||||
import "image"
|
||||
|
||||
var (
|
||||
// 可以出现在中间的方块，一般为了美观，都是对称图像。
|
||||
// the blocks can appear in center, these blocks can be more beautiful
|
||||
centerBlocks = []blockFunc{b0, b1, b2, b3, b19, b26, b27}
|
||||
|
||||
// 所有方块
|
||||
// all blocks
|
||||
blocks = []blockFunc{b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14, b15, b16, b17, b18, b19, b20, b21, b22, b23, b24, b25, b26, b27}
|
||||
)
|
||||
|
||||
// 所有 block 函数的类型
|
||||
type blockFunc func(img *image.Paletted, x, y, size int, angle int)
|
||||
|
||||
// 将多边形 points 旋转 angle 个角度，然后输出到 img 上，起点为 x,y 坐标
|
||||
//
|
||||
// points 中的坐标是基于左上角是原点的坐标系。
|
||||
// draw a polygon by points, and the polygon is rotated by angle.
|
||||
func drawBlock(img *image.Paletted, x, y, size int, angle int, points []int) {
|
||||
if angle > 0 { // 0 角度不需要转换
|
||||
if angle != 0 {
|
||||
m := size / 2
|
||||
rotate(points, m, m, angle)
|
||||
}
|
||||
|
|
@ -33,7 +34,7 @@ func drawBlock(img *image.Paletted, x, y, size int, angle int, points []int) {
|
|||
}
|
||||
}
|
||||
|
||||
// 全空白
|
||||
// blank
|
||||
//
|
||||
// --------
|
||||
// | |
|
||||
|
|
@ -42,7 +43,7 @@ func drawBlock(img *image.Paletted, x, y, size int, angle int, points []int) {
|
|||
// --------
|
||||
func b0(img *image.Paletted, x, y, size int, angle int) {}
|
||||
|
||||
// 全填充正方形
|
||||
// full-filled
|
||||
//
|
||||
// --------
|
||||
// |######|
|
||||
|
|
@ -57,7 +58,7 @@ func b1(img *image.Paletted, x, y, size int, angle int) {
|
|||
}
|
||||
}
|
||||
|
||||
// 中间小方块
|
||||
// a small block
|
||||
// ----------
|
||||
// | |
|
||||
// | #### |
|
||||
|
|
@ -66,8 +67,8 @@ func b1(img *image.Paletted, x, y, size int, angle int) {
|
|||
// ----------
|
||||
func b2(img *image.Paletted, x, y, size int, angle int) {
|
||||
l := size / 4
|
||||
x = x + l
|
||||
y = y + l
|
||||
x += l
|
||||
y += l
|
||||
|
||||
for i := x; i < x+2*l; i++ {
|
||||
for j := y; j < y+2*l; j++ {
|
||||
|
|
@ -76,7 +77,7 @@ func b2(img *image.Paletted, x, y, size int, angle int) {
|
|||
}
|
||||
}
|
||||
|
||||
// 菱形
|
||||
// diamond
|
||||
//
|
||||
// ---------
|
||||
// | # |
|
||||
|
|
@ -133,7 +134,7 @@ func b5(img *image.Paletted, x, y, size int, angle int) {
|
|||
})
|
||||
}
|
||||
|
||||
// b6 矩形
|
||||
// b6
|
||||
//
|
||||
// --------
|
||||
// |### |
|
||||
|
|
@ -151,7 +152,7 @@ func b6(img *image.Paletted, x, y, size int, angle int) {
|
|||
})
|
||||
}
|
||||
|
||||
// b7 斜放的锥形
|
||||
// b7 italic cone
|
||||
//
|
||||
// ---------
|
||||
// | # |
|
||||
|
|
@ -170,7 +171,7 @@ func b7(img *image.Paletted, x, y, size int, angle int) {
|
|||
})
|
||||
}
|
||||
|
||||
// b8 三个堆叠的三角形
|
||||
// b8 three small triangles
|
||||
//
|
||||
// -----------
|
||||
// | # |
|
||||
|
|
@ -184,7 +185,7 @@ func b8(img *image.Paletted, x, y, size int, angle int) {
|
|||
m := size / 2
|
||||
mm := m / 2
|
||||
|
||||
// 顶部三角形
|
||||
// top
|
||||
drawBlock(img, x, y, size, angle, []int{
|
||||
m, 0,
|
||||
3 * mm, m,
|
||||
|
|
@ -192,7 +193,7 @@ func b8(img *image.Paletted, x, y, size int, angle int) {
|
|||
m, 0,
|
||||
})
|
||||
|
||||
// 底下左边
|
||||
// bottom left
|
||||
drawBlock(img, x, y, size, angle, []int{
|
||||
mm, m,
|
||||
m, size,
|
||||
|
|
@ -200,7 +201,7 @@ func b8(img *image.Paletted, x, y, size int, angle int) {
|
|||
mm, m,
|
||||
})
|
||||
|
||||
// 底下右边
|
||||
// bottom right
|
||||
drawBlock(img, x, y, size, angle, []int{
|
||||
3 * mm, m,
|
||||
size, size,
|
||||
|
|
@ -209,7 +210,7 @@ func b8(img *image.Paletted, x, y, size int, angle int) {
|
|||
})
|
||||
}
|
||||
|
||||
// b9 斜靠的三角形
|
||||
// b9 italic triangle
|
||||
//
|
||||
// ---------
|
||||
// |# |
|
||||
|
|
@ -257,7 +258,7 @@ func b10(img *image.Paletted, x, y, size int, angle int) {
|
|||
})
|
||||
}
|
||||
|
||||
// b11 左上角1/4大小的方块
|
||||
// b11
|
||||
//
|
||||
// ----------
|
||||
// |#### |
|
||||
135
modules/avatar/identicon/colors.go
Normal file
135
modules/avatar/identicon/colors.go
Normal file
|
|
@ -0,0 +1,135 @@
|
|||
// Copyright 2021 The Gitea Authors. All rights reserved.
|
||||
// Use of this source code is governed by a MIT-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package identicon
|
||||
|
||||
import "image/color"
|
||||
|
||||
// DarkColors are dark colors for avatar blocks, they come from image/color/palette.WebSafe, and light colors (0xff) are removed
|
||||
var DarkColors = []color.Color{
|
||||
color.RGBA{0x00, 0x00, 0x33, 0xff},
|
||||
color.RGBA{0x00, 0x00, 0x66, 0xff},
|
||||
color.RGBA{0x00, 0x00, 0x99, 0xff},
|
||||
color.RGBA{0x00, 0x00, 0xcc, 0xff},
|
||||
color.RGBA{0x00, 0x33, 0x00, 0xff},
|
||||
color.RGBA{0x00, 0x33, 0x33, 0xff},
|
||||
color.RGBA{0x00, 0x33, 0x66, 0xff},
|
||||
color.RGBA{0x00, 0x33, 0x99, 0xff},
|
||||
color.RGBA{0x00, 0x33, 0xcc, 0xff},
|
||||
color.RGBA{0x00, 0x66, 0x00, 0xff},
|
||||
color.RGBA{0x00, 0x66, 0x33, 0xff},
|
||||
color.RGBA{0x00, 0x66, 0x66, 0xff},
|
||||
color.RGBA{0x00, 0x66, 0x99, 0xff},
|
||||
color.RGBA{0x00, 0x66, 0xcc, 0xff},
|
||||
color.RGBA{0x00, 0x99, 0x00, 0xff},
|
||||
color.RGBA{0x00, 0x99, 0x33, 0xff},
|
||||
color.RGBA{0x00, 0x99, 0x66, 0xff},
|
||||
color.RGBA{0x00, 0x99, 0x99, 0xff},
|
||||
color.RGBA{0x00, 0x99, 0xcc, 0xff},
|
||||
color.RGBA{0x00, 0xcc, 0x00, 0xff},
|
||||
color.RGBA{0x00, 0xcc, 0x33, 0xff},
|
||||
color.RGBA{0x00, 0xcc, 0x66, 0xff},
|
||||
color.RGBA{0x00, 0xcc, 0x99, 0xff},
|
||||
color.RGBA{0x00, 0xcc, 0xcc, 0xff},
|
||||
color.RGBA{0x33, 0x00, 0x00, 0xff},
|
||||
color.RGBA{0x33, 0x00, 0x33, 0xff},
|
||||
color.RGBA{0x33, 0x00, 0x66, 0xff},
|
||||
color.RGBA{0x33, 0x00, 0x99, 0xff},
|
||||
color.RGBA{0x33, 0x00, 0xcc, 0xff},
|
||||
color.RGBA{0x33, 0x33, 0x00, 0xff},
|
||||
color.RGBA{0x33, 0x33, 0x33, 0xff},
|
||||
color.RGBA{0x33, 0x33, 0x66, 0xff},
|
||||
color.RGBA{0x33, 0x33, 0x99, 0xff},
|
||||
color.RGBA{0x33, 0x33, 0xcc, 0xff},
|
||||
color.RGBA{0x33, 0x66, 0x00, 0xff},
|
||||
color.RGBA{0x33, 0x66, 0x33, 0xff},
|
||||
color.RGBA{0x33, 0x66, 0x66, 0xff},
|
||||
color.RGBA{0x33, 0x66, 0x99, 0xff},
|
||||
color.RGBA{0x33, 0x66, 0xcc, 0xff},
|
||||
color.RGBA{0x33, 0x99, 0x00, 0xff},
|
||||
color.RGBA{0x33, 0x99, 0x33, 0xff},
|
||||
color.RGBA{0x33, 0x99, 0x66, 0xff},
|
||||
color.RGBA{0x33, 0x99, 0x99, 0xff},
|
||||
color.RGBA{0x33, 0x99, 0xcc, 0xff},
|
||||
color.RGBA{0x33, 0xcc, 0x00, 0xff},
|
||||
color.RGBA{0x33, 0xcc, 0x33, 0xff},
|
||||
color.RGBA{0x33, 0xcc, 0x66, 0xff},
|
||||
color.RGBA{0x33, 0xcc, 0x99, 0xff},
|
||||
color.RGBA{0x33, 0xcc, 0xcc, 0xff},
|
||||
color.RGBA{0x66, 0x00, 0x00, 0xff},
|
||||
color.RGBA{0x66, 0x00, 0x33, 0xff},
|
||||
color.RGBA{0x66, 0x00, 0x66, 0xff},
|
||||
color.RGBA{0x66, 0x00, 0x99, 0xff},
|
||||
color.RGBA{0x66, 0x00, 0xcc, 0xff},
|
||||
color.RGBA{0x66, 0x33, 0x00, 0xff},
|
||||
color.RGBA{0x66, 0x33, 0x33, 0xff},
|
||||
color.RGBA{0x66, 0x33, 0x66, 0xff},
|
||||
color.RGBA{0x66, 0x33, 0x99, 0xff},
|
||||
color.RGBA{0x66, 0x33, 0xcc, 0xff},
|
||||
color.RGBA{0x66, 0x66, 0x00, 0xff},
|
||||
color.RGBA{0x66, 0x66, 0x33, 0xff},
|
||||
color.RGBA{0x66, 0x66, 0x66, 0xff},
|
||||
color.RGBA{0x66, 0x66, 0x99, 0xff},
|
||||
color.RGBA{0x66, 0x66, 0xcc, 0xff},
|
||||
color.RGBA{0x66, 0x99, 0x00, 0xff},
|
||||
color.RGBA{0x66, 0x99, 0x33, 0xff},
|
||||
color.RGBA{0x66, 0x99, 0x66, 0xff},
|
||||
color.RGBA{0x66, 0x99, 0x99, 0xff},
|
||||
color.RGBA{0x66, 0x99, 0xcc, 0xff},
|
||||
color.RGBA{0x66, 0xcc, 0x00, 0xff},
|
||||
color.RGBA{0x66, 0xcc, 0x33, 0xff},
|
||||
color.RGBA{0x66, 0xcc, 0x66, 0xff},
|
||||
color.RGBA{0x66, 0xcc, 0x99, 0xff},
|
||||
color.RGBA{0x66, 0xcc, 0xcc, 0xff},
|
||||
color.RGBA{0x99, 0x00, 0x00, 0xff},
|
||||
color.RGBA{0x99, 0x00, 0x33, 0xff},
|
||||
color.RGBA{0x99, 0x00, 0x66, 0xff},
|
||||
color.RGBA{0x99, 0x00, 0x99, 0xff},
|
||||
color.RGBA{0x99, 0x00, 0xcc, 0xff},
|
||||
color.RGBA{0x99, 0x33, 0x00, 0xff},
|
||||
color.RGBA{0x99, 0x33, 0x33, 0xff},
|
||||
color.RGBA{0x99, 0x33, 0x66, 0xff},
|
||||
color.RGBA{0x99, 0x33, 0x99, 0xff},
|
||||
color.RGBA{0x99, 0x33, 0xcc, 0xff},
|
||||
color.RGBA{0x99, 0x66, 0x00, 0xff},
|
||||
color.RGBA{0x99, 0x66, 0x33, 0xff},
|
||||
color.RGBA{0x99, 0x66, 0x66, 0xff},
|
||||
color.RGBA{0x99, 0x66, 0x99, 0xff},
|
||||
color.RGBA{0x99, 0x66, 0xcc, 0xff},
|
||||
color.RGBA{0x99, 0x99, 0x00, 0xff},
|
||||
color.RGBA{0x99, 0x99, 0x33, 0xff},
|
||||
color.RGBA{0x99, 0x99, 0x66, 0xff},
|
||||
color.RGBA{0x99, 0x99, 0x99, 0xff},
|
||||
color.RGBA{0x99, 0x99, 0xcc, 0xff},
|
||||
color.RGBA{0x99, 0xcc, 0x00, 0xff},
|
||||
color.RGBA{0x99, 0xcc, 0x33, 0xff},
|
||||
color.RGBA{0x99, 0xcc, 0x66, 0xff},
|
||||
color.RGBA{0x99, 0xcc, 0x99, 0xff},
|
||||
color.RGBA{0x99, 0xcc, 0xcc, 0xff},
|
||||
color.RGBA{0xcc, 0x00, 0x00, 0xff},
|
||||
color.RGBA{0xcc, 0x00, 0x33, 0xff},
|
||||
color.RGBA{0xcc, 0x00, 0x66, 0xff},
|
||||
color.RGBA{0xcc, 0x00, 0x99, 0xff},
|
||||
color.RGBA{0xcc, 0x00, 0xcc, 0xff},
|
||||
color.RGBA{0xcc, 0x33, 0x00, 0xff},
|
||||
color.RGBA{0xcc, 0x33, 0x33, 0xff},
|
||||
color.RGBA{0xcc, 0x33, 0x66, 0xff},
|
||||
color.RGBA{0xcc, 0x33, 0x99, 0xff},
|
||||
color.RGBA{0xcc, 0x33, 0xcc, 0xff},
|
||||
color.RGBA{0xcc, 0x66, 0x00, 0xff},
|
||||
color.RGBA{0xcc, 0x66, 0x33, 0xff},
|
||||
color.RGBA{0xcc, 0x66, 0x66, 0xff},
|
||||
color.RGBA{0xcc, 0x66, 0x99, 0xff},
|
||||
color.RGBA{0xcc, 0x66, 0xcc, 0xff},
|
||||
color.RGBA{0xcc, 0x99, 0x00, 0xff},
|
||||
color.RGBA{0xcc, 0x99, 0x33, 0xff},
|
||||
color.RGBA{0xcc, 0x99, 0x66, 0xff},
|
||||
color.RGBA{0xcc, 0x99, 0x99, 0xff},
|
||||
color.RGBA{0xcc, 0x99, 0xcc, 0xff},
|
||||
color.RGBA{0xcc, 0xcc, 0x00, 0xff},
|
||||
color.RGBA{0xcc, 0xcc, 0x33, 0xff},
|
||||
color.RGBA{0xcc, 0xcc, 0x66, 0xff},
|
||||
color.RGBA{0xcc, 0xcc, 0x99, 0xff},
|
||||
color.RGBA{0xcc, 0xcc, 0xcc, 0xff},
|
||||
}
|
||||
141
modules/avatar/identicon/identicon.go
Normal file
141
modules/avatar/identicon/identicon.go
Normal file
|
|
@ -0,0 +1,141 @@
|
|||
// Copyright 2021 The Gitea Authors. All rights reserved.
|
||||
// Use of this source code is governed by a MIT-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// Copied and modified from https://github.com/issue9/identicon/ (MIT License)
|
||||
// Generate pseudo-random avatars by IP, E-mail, etc.
|
||||
|
||||
package identicon
|
||||
|
||||
import (
|
||||
"crypto/sha256"
|
||||
"fmt"
|
||||
"image"
|
||||
"image/color"
|
||||
)
|
||||
|
||||
const minImageSize = 16
|
||||
|
||||
// Identicon is used to generate pseudo-random avatars
|
||||
type Identicon struct {
|
||||
foreColors []color.Color
|
||||
backColor color.Color
|
||||
size int
|
||||
rect image.Rectangle
|
||||
}
|
||||
|
||||
// New returns an Identicon struct with the correct settings
|
||||
// size image size
|
||||
// back background color
|
||||
// fore all possible foreground colors. only one foreground color will be picked randomly for one image
|
||||
func New(size int, back color.Color, fore ...color.Color) (*Identicon, error) {
|
||||
if len(fore) == 0 {
|
||||
return nil, fmt.Errorf("foreground is not set")
|
||||
}
|
||||
|
||||
if size < minImageSize {
|
||||
return nil, fmt.Errorf("size %d is smaller than min size %d", size, minImageSize)
|
||||
}
|
||||
|
||||
return &Identicon{
|
||||
foreColors: fore,
|
||||
backColor: back,
|
||||
size: size,
|
||||
rect: image.Rect(0, 0, size, size),
|
||||
}, nil
|
||||
}
|
||||
|
||||
// Make generates an avatar by data
|
||||
func (i *Identicon) Make(data []byte) image.Image {
|
||||
h := sha256.New()
|
||||
h.Write(data)
|
||||
sum := h.Sum(nil)
|
||||
|
||||
b1 := int(sum[0]+sum[1]+sum[2]) % len(blocks)
|
||||
b2 := int(sum[3]+sum[4]+sum[5]) % len(blocks)
|
||||
c := int(sum[6]+sum[7]+sum[8]) % len(centerBlocks)
|
||||
b1Angle := int(sum[9]+sum[10]) % 4
|
||||
b2Angle := int(sum[11]+sum[12]) % 4
|
||||
foreColor := int(sum[11]+sum[12]+sum[15]) % len(i.foreColors)
|
||||
|
||||
return i.render(c, b1, b2, b1Angle, b2Angle, foreColor)
|
||||
}
|
||||
|
||||
func (i *Identicon) render(c, b1, b2, b1Angle, b2Angle, foreColor int) image.Image {
|
||||
p := image.NewPaletted(i.rect, []color.Color{i.backColor, i.foreColors[foreColor]})
|
||||
drawBlocks(p, i.size, centerBlocks[c], blocks[b1], blocks[b2], b1Angle, b2Angle)
|
||||
return p
|
||||
}
|
||||
|
||||
/*
|
||||
# Algorithm
|
||||
|
||||
Origin: An image is splitted into 9 areas
|
||||
|
||||
```
|
||||
-------------
|
||||
| 1 | 2 | 3 |
|
||||
-------------
|
||||
| 4 | 5 | 6 |
|
||||
-------------
|
||||
| 7 | 8 | 9 |
|
||||
-------------
|
||||
```
|
||||
|
||||
Area 1/3/9/7 use a 90-degree rotating pattern.
|
||||
Area 1/3/9/7 use another 90-degree rotating pattern.
|
||||
Area 5 uses a random patter.
|
||||
|
||||
The Patched Fix: make the image left-right mirrored to get rid of something like "swastika"
|
||||
*/
|
||||
|
||||
// draw blocks to the paletted
|
||||
// c: the block drawer for the center block
|
||||
// b1,b2: the block drawers for other blocks (around the center block)
|
||||
// b1Angle,b2Angle: the angle for the rotation of b1/b2
|
||||
func drawBlocks(p *image.Paletted, size int, c, b1, b2 blockFunc, b1Angle, b2Angle int) {
|
||||
nextAngle := func(a int) int {
|
||||
return (a + 1) % 4
|
||||
}
|
||||
|
||||
padding := (size % 3) / 2 // in cased the size can not be aligned by 3 blocks.
|
||||
|
||||
blockSize := size / 3
|
||||
twoBlockSize := 2 * blockSize
|
||||
|
||||
// center
|
||||
c(p, blockSize+padding, blockSize+padding, blockSize, 0)
|
||||
|
||||
// left top (1)
|
||||
b1(p, 0+padding, 0+padding, blockSize, b1Angle)
|
||||
// center top (2)
|
||||
b2(p, blockSize+padding, 0+padding, blockSize, b2Angle)
|
||||
|
||||
b1Angle = nextAngle(b1Angle)
|
||||
b2Angle = nextAngle(b2Angle)
|
||||
// right top (3)
|
||||
// b1(p, twoBlockSize+padding, 0+padding, blockSize, b1Angle)
|
||||
// right middle (6)
|
||||
// b2(p, twoBlockSize+padding, blockSize+padding, blockSize, b2Angle)
|
||||
|
||||
b1Angle = nextAngle(b1Angle)
|
||||
b2Angle = nextAngle(b2Angle)
|
||||
// right bottom (9)
|
||||
// b1(p, twoBlockSize+padding, twoBlockSize+padding, blockSize, b1Angle)
|
||||
// center bottom (8)
|
||||
b2(p, blockSize+padding, twoBlockSize+padding, blockSize, b2Angle)
|
||||
|
||||
b1Angle = nextAngle(b1Angle)
|
||||
b2Angle = nextAngle(b2Angle)
|
||||
// lef bottom (7)
|
||||
b1(p, 0+padding, twoBlockSize+padding, blockSize, b1Angle)
|
||||
// left middle (4)
|
||||
b2(p, 0+padding, blockSize+padding, blockSize, b2Angle)
|
||||
|
||||
// then we make it left-right mirror, so we didn't draw 3/6/9 before
|
||||
for x := 0; x < size/2; x++ {
|
||||
for y := 0; y < size; y++ {
|
||||
p.SetColorIndex(size-x, y, p.ColorIndexAt(x, y))
|
||||
}
|
||||
}
|
||||
}
|
||||
42
modules/avatar/identicon/identicon_test.go
Normal file
42
modules/avatar/identicon/identicon_test.go
Normal file
|
|
@ -0,0 +1,42 @@
|
|||
// Copyright 2021 The Gitea Authors. All rights reserved.
|
||||
// Use of this source code is governed by a MIT-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
//go:build test_avatar_identicon
|
||||
// +build test_avatar_identicon
|
||||
|
||||
package identicon
|
||||
|
||||
import (
|
||||
"image/color"
|
||||
"image/png"
|
||||
"os"
|
||||
"strconv"
|
||||
"testing"
|
||||
|
||||
"github.com/stretchr/testify/assert"
|
||||
)
|
||||
|
||||
func TestGenerate(t *testing.T) {
|
||||
dir, _ := os.Getwd()
|
||||
dir = dir + "/testdata"
|
||||
if st, err := os.Stat(dir); err != nil || !st.IsDir() {
|
||||
t.Errorf("can not save generated images to %s", dir)
|
||||
}
|
||||
|
||||
backColor := color.White
|
||||
imgMaker, err := New(64, backColor, DarkColors...)
|
||||
assert.NoError(t, err)
|
||||
for i := 0; i < 100; i++ {
|
||||
s := strconv.Itoa(i)
|
||||
img := imgMaker.Make([]byte(s))
|
||||
|
||||
f, err := os.Create(dir + "/" + s + ".png")
|
||||
if !assert.NoError(t, err) {
|
||||
continue
|
||||
}
|
||||
defer f.Close()
|
||||
err = png.Encode(f, img)
|
||||
assert.NoError(t, err)
|
||||
}
|
||||
}
|
||||
69
modules/avatar/identicon/polygon.go
Normal file
69
modules/avatar/identicon/polygon.go
Normal file
|
|
@ -0,0 +1,69 @@
|
|||
// Copyright 2021 The Gitea Authors. All rights reserved.
|
||||
// Use of this source code is governed by a MIT-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// Copied and modified from https://github.com/issue9/identicon/ (MIT License)
|
||||
|
||||
package identicon
|
||||
|
||||
var (
|
||||
// cos(0),cos(90),cos(180),cos(270)
|
||||
cos = []int{1, 0, -1, 0}
|
||||
|
||||
// sin(0),sin(90),sin(180),sin(270)
|
||||
sin = []int{0, 1, 0, -1}
|
||||
)
|
||||
|
||||
// rotate the points by center point (x,y)
|
||||
// angle: [0,1,2,3] means [0，90，180，270] degree
|
||||
func rotate(points []int, x, y int, angle int) {
|
||||
// the angle is only used internally, and it has been guaranteed to be 0/1/2/3, so we do not check it again
|
||||
for i := 0; i < len(points); i += 2 {
|
||||
px, py := points[i]-x, points[i+1]-y
|
||||
points[i] = px*cos[angle] - py*sin[angle] + x
|
||||
points[i+1] = px*sin[angle] + py*cos[angle] + y
|
||||
}
|
||||
}
|
||||
|
||||
// check whether the point is inside the polygon (defined by the points)
|
||||
// the first and the last point must be the same
|
||||
func pointInPolygon(x, y int, polygonPoints []int) bool {
|
||||
if len(polygonPoints) < 8 { // a valid polygon must have more than 2 points
|
||||
return false
|
||||
}
|
||||
|
||||
// reference: nonzero winding rule, https://en.wikipedia.org/wiki/Nonzero-rule
|
||||
// split the plane into two by the check point horizontally:
|
||||
// y>0，includes (x>0 && y==0)
|
||||
// y<0，includes (x<0 && y==0)
|
||||
//
|
||||
// then scan every point in the polygon.
|
||||
//
|
||||
// if current point and previous point are in different planes (eg: curY>0 && prevY<0),
|
||||
// check the clock-direction from previous point to current point (use check point as origin).
|
||||
// if the direction is clockwise, then r++, otherwise then r--
|
||||
// finally, if 2==abs(r), then the check point is inside the polygon
|
||||
|
||||
r := 0
|
||||
prevX, prevY := polygonPoints[0], polygonPoints[1]
|
||||
prev := (prevY > y) || ((prevX > x) && (prevY == y))
|
||||
for i := 2; i < len(polygonPoints); i += 2 {
|
||||
currX, currY := polygonPoints[i], polygonPoints[i+1]
|
||||
curr := (currY > y) || ((currX > x) && (currY == y))
|
||||
|
||||
if curr == prev {
|
||||
prevX, prevY = currX, currY
|
||||
continue
|
||||
}
|
||||
|
||||
if mul := (prevX-x)*(currY-y) - (currX-x)*(prevY-y); mul >= 0 {
|
||||
r++
|
||||
} else { // mul < 0
|
||||
r--
|
||||
}
|
||||
prevX, prevY = currX, currY
|
||||
prev = curr
|
||||
}
|
||||
|
||||
return r == 2 || r == -2
|
||||
}
|
||||
1
modules/avatar/identicon/testdata/.gitignore
vendored
Normal file
1
modules/avatar/identicon/testdata/.gitignore
vendored
Normal file
|
|
@ -0,0 +1 @@
|
|||
*
|
||||
23
vendor/github.com/issue9/identicon/.gitignore
generated
vendored
23
vendor/github.com/issue9/identicon/.gitignore
generated
vendored
|
|
@ -1,23 +0,0 @@
|
|||
# Compiled Object files, Static and Dynamic libs (Shared Objects)
|
||||
*.o
|
||||
*.a
|
||||
*.so
|
||||
|
||||
# Folders
|
||||
_obj
|
||||
_test
|
||||
|
||||
*.exe
|
||||
*.test
|
||||
*.prof
|
||||
|
||||
#vim
|
||||
*.swp
|
||||
|
||||
#osx
|
||||
.DS_Store
|
||||
|
||||
/testdata/*.png
|
||||
|
||||
.idea
|
||||
.vscode
|
||||
22
vendor/github.com/issue9/identicon/LICENSE
generated
vendored
22
vendor/github.com/issue9/identicon/LICENSE
generated
vendored
|
|
@ -1,22 +0,0 @@
|
|||
The MIT License (MIT)
|
||||
|
||||
Copyright (c) 2015 caixw
|
||||
|
||||
Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
of this software and associated documentation files (the "Software"), to deal
|
||||
in the Software without restriction, including without limitation the rights
|
||||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
copies of the Software, and to permit persons to whom the Software is
|
||||
furnished to do so, subject to the following conditions:
|
||||
|
||||
The above copyright notice and this permission notice shall be included in all
|
||||
copies or substantial portions of the Software.
|
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
SOFTWARE.
|
||||
|
||||
38
vendor/github.com/issue9/identicon/README.md
generated
vendored
38
vendor/github.com/issue9/identicon/README.md
generated
vendored
|
|
@ -1,38 +0,0 @@
|
|||
# identicon
|
||||
|
||||
[](https://github.com/issue9/identicon/actions/workflows/go.yml)
|
||||
[](https://codecov.io/gh/issue9/identicon)
|
||||
[](https://pkg.go.dev/github.com/issue9/identicon)
|
||||
|
||||
|
||||
|
||||
根据用户的 IP 、邮箱名等任意数据为用户产生漂亮的随机头像。
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
```go
|
||||
// 根据用户访问的IP，为其生成一张头像
|
||||
img, _ := identicon.Make(128, color.NRGBA{},color.NRGBA{}, []byte("192.168.1.1"))
|
||||
fi, _ := os.Create("/tmp/u1.png")
|
||||
png.Encode(fi, img)
|
||||
fi.Close()
|
||||
|
||||
// 或者
|
||||
ii, _ := identicon.New(128, color.NRGBA{}, color.NRGBA{}, color.NRGBA{}, color.NRGBA{})
|
||||
img := ii.Make([]byte("192.168.1.1"))
|
||||
img = ii.Make([]byte("192.168.1.2"))
|
||||
```
|
||||
|
||||
## 安装
|
||||
|
||||
```shell
|
||||
go get github.com/issue9/identicon
|
||||
```
|
||||
|
||||
## 版权
|
||||
|
||||
本项目采用 [MIT](https://opensource.org/licenses/MIT) 开源授权许可证，完整的授权说明可在 [LICENSE](LICENSE) 文件中找到。
|
||||
35
vendor/github.com/issue9/identicon/doc.go
generated
vendored
35
vendor/github.com/issue9/identicon/doc.go
generated
vendored
|
|
@ -1,35 +0,0 @@
|
|||
// SPDX-License-Identifier: MIT
|
||||
|
||||
// Package identicon 一个基于 hash 值生成随机图像的包
|
||||
//
|
||||
// identicon 并没有统一的标准，一般用于在用户注册时，
|
||||
// 取用户的邮箱或是访问 IP 等数据(也可以是其它任何数据)，
|
||||
// 进行 hash 运算，之后根据 hash 数据，产生一张图像，
|
||||
// 这样即可以为用户产生一张独特的头像，又不会泄漏用户的隐藏。
|
||||
//
|
||||
// 在 identicon 中，把图像分成以下九个部分:
|
||||
// -------------
|
||||
// | 1 | 2 | 3 |
|
||||
// -------------
|
||||
// | 4 | 5 | 6 |
|
||||
// -------------
|
||||
// | 7 | 8 | 9 |
|
||||
// -------------
|
||||
// 其中 1、3、9、7 为不同角度(依次增加 90 度)的同一张图片，
|
||||
// 2、6、8、4 也是如此，这样可以保持图像是对称的，比较美观。
|
||||
// 5 则单独使用一张图片。
|
||||
//
|
||||
// // 根据用户访问的 IP ，为其生成一张头像
|
||||
// img, _ := identicon.Make(128, color.NRGBA{},color.NRGBA{}, []byte("192.168.1.1"))
|
||||
// fi, _ := os.Create("/tmp/u1.png")
|
||||
// png.Encode(fi, img)
|
||||
// fi.Close()
|
||||
//
|
||||
// // 或者
|
||||
// ii, _ := identicon.New(128, color.NRGBA{}, color.NRGBA{}, color.NRGBA{})
|
||||
// img := ii.Make([]byte("192.168.1.1"))
|
||||
// img = ii.Make([]byte("192.168.1.2"))
|
||||
//
|
||||
// NOTE: go test 会在当前目录的 testdata 文件夹下产生大量的随机图片。
|
||||
// 要运行测试，必须保证该文件夹是存在的，且有相应的写入权限。
|
||||
package identicon
|
||||
5
vendor/github.com/issue9/identicon/go.mod
generated
vendored
5
vendor/github.com/issue9/identicon/go.mod
generated
vendored
|
|
@ -1,5 +0,0 @@
|
|||
module github.com/issue9/identicon
|
||||
|
||||
require github.com/issue9/assert v1.4.1
|
||||
|
||||
go 1.13
|
||||
2
vendor/github.com/issue9/identicon/go.sum
generated
vendored
2
vendor/github.com/issue9/identicon/go.sum
generated
vendored
|
|
@ -1,2 +0,0 @@
|
|||
github.com/issue9/assert v1.4.1 h1:gUtOpMTeaE4JTe9kACma5foOHBvVt1p5XTFrULDwdXI=
|
||||
github.com/issue9/assert v1.4.1/go.mod h1:Yktk83hAVl1SPSYtd9kjhBizuiBIqUQyj+D5SE2yjVY=
|
||||
137
vendor/github.com/issue9/identicon/identicon.go
generated
vendored
137
vendor/github.com/issue9/identicon/identicon.go
generated
vendored
|
|
@ -1,137 +0,0 @@
|
|||
// SPDX-License-Identifier: MIT
|
||||
|
||||
package identicon
|
||||
|
||||
import (
|
||||
"crypto/md5"
|
||||
"fmt"
|
||||
"image"
|
||||
"image/color"
|
||||
"math/rand"
|
||||
)
|
||||
|
||||
const (
|
||||
minSize = 16 // 图片的最小尺寸
|
||||
maxForeColors = 32 // 在New()函数中可以指定的最大颜色数量
|
||||
)
|
||||
|
||||
// Identicon 用于产生统一尺寸的头像
|
||||
//
|
||||
// 可以根据用户提供的数据，经过一定的算法，自动产生相应的图案和颜色。
|
||||
type Identicon struct {
|
||||
foreColors []color.Color
|
||||
backColor color.Color
|
||||
size int
|
||||
rect image.Rectangle
|
||||
}
|
||||
|
||||
// New 声明一个 Identicon 实例
|
||||
//
|
||||
// size 表示整个头像的大小；
|
||||
// back 表示前景色；
|
||||
// fore 表示所有可能的前景色，会为每个图像随机挑选一个作为其前景色。
|
||||
func New(size int, back color.Color, fore ...color.Color) (*Identicon, error) {
|
||||
if len(fore) == 0 || len(fore) > maxForeColors {
|
||||
return nil, fmt.Errorf("前景色数量必须介于[1]~[%d]之间，当前为[%d]", maxForeColors, len(fore))
|
||||
}
|
||||
|
||||
if size < minSize {
|
||||
return nil, fmt.Errorf("参数 size 的值(%d)不能小于 %d", size, minSize)
|
||||
}
|
||||
|
||||
return &Identicon{
|
||||
foreColors: fore,
|
||||
backColor: back,
|
||||
size: size,
|
||||
|
||||
// 画布坐标从0开始，其长度应该是 size-1
|
||||
rect: image.Rect(0, 0, size, size),
|
||||
}, nil
|
||||
}
|
||||
|
||||
// Make 根据 data 数据产生一张唯一性的头像图片
|
||||
func (i *Identicon) Make(data []byte) image.Image {
|
||||
h := md5.New()
|
||||
h.Write(data)
|
||||
sum := h.Sum(nil)
|
||||
|
||||
b1 := int(sum[0]+sum[1]+sum[2]) % len(blocks)
|
||||
b2 := int(sum[3]+sum[4]+sum[5]) % len(blocks)
|
||||
c := int(sum[6]+sum[7]+sum[8]) % len(centerBlocks)
|
||||
b1Angle := int(sum[9]+sum[10]) % 4
|
||||
b2Angle := int(sum[11]+sum[12]) % 4
|
||||
color := int(sum[11]+sum[12]+sum[15]) % len(i.foreColors)
|
||||
|
||||
return i.render(c, b1, b2, b1Angle, b2Angle, color)
|
||||
}
|
||||
|
||||
// Rand 随机生成图案
|
||||
func (i *Identicon) Rand(r *rand.Rand) image.Image {
|
||||
b1 := r.Intn(len(blocks))
|
||||
b2 := r.Intn(len(blocks))
|
||||
c := r.Intn(len(centerBlocks))
|
||||
b1Angle := r.Intn(4)
|
||||
b2Angle := r.Intn(4)
|
||||
color := r.Intn(len(i.foreColors))
|
||||
|
||||
return i.render(c, b1, b2, b1Angle, b2Angle, color)
|
||||
}
|
||||
|
||||
func (i *Identicon) render(c, b1, b2, b1Angle, b2Angle, foreColor int) image.Image {
|
||||
p := image.NewPaletted(i.rect, []color.Color{i.backColor, i.foreColors[foreColor]})
|
||||
drawBlocks(p, i.size, centerBlocks[c], blocks[b1], blocks[b2], b1Angle, b2Angle)
|
||||
return p
|
||||
}
|
||||
|
||||
// Make 根据 data 数据产生一张唯一性的头像图片
|
||||
//
|
||||
// size 头像的大小。
|
||||
// back, fore头像的背景和前景色。
|
||||
func Make(size int, back, fore color.Color, data []byte) (image.Image, error) {
|
||||
i, err := New(size, back, fore)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return i.Make(data), nil
|
||||
}
|
||||
|
||||
// 将九个方格都填上内容。
|
||||
// p 为画板；
|
||||
// c 为中间方格的填充函数；
|
||||
// b1、b2 为边上 8 格的填充函数；
|
||||
// b1Angle 和 b2Angle 为 b1、b2 的起始旋转角度。
|
||||
func drawBlocks(p *image.Paletted, size int, c, b1, b2 blockFunc, b1Angle, b2Angle int) {
|
||||
incr := func(a int) int {
|
||||
if a >= 3 {
|
||||
a = 0
|
||||
} else {
|
||||
a++
|
||||
}
|
||||
return a
|
||||
}
|
||||
|
||||
padding := (size % 6) / 2 // 不能除尽的，边上留白。
|
||||
|
||||
blockSize := size / 3
|
||||
twoBlockSize := 2 * blockSize
|
||||
|
||||
c(p, blockSize+padding, blockSize+padding, blockSize, 0)
|
||||
|
||||
b1(p, 0+padding, 0+padding, blockSize, b1Angle)
|
||||
b2(p, blockSize+padding, 0+padding, blockSize, b2Angle)
|
||||
|
||||
b1Angle = incr(b1Angle)
|
||||
b2Angle = incr(b2Angle)
|
||||
b1(p, twoBlockSize+padding, 0+padding, blockSize, b1Angle)
|
||||
b2(p, twoBlockSize+padding, blockSize+padding, blockSize, b2Angle)
|
||||
|
||||
b1Angle = incr(b1Angle)
|
||||
b2Angle = incr(b2Angle)
|
||||
b1(p, twoBlockSize+padding, twoBlockSize+padding, blockSize, b1Angle)
|
||||
b2(p, blockSize+padding, twoBlockSize+padding, blockSize, b2Angle)
|
||||
|
||||
b1Angle = incr(b1Angle)
|
||||
b2Angle = incr(b2Angle)
|
||||
b1(p, 0+padding, twoBlockSize+padding, blockSize, b1Angle)
|
||||
b2(p, 0+padding, blockSize+padding, blockSize, b2Angle)
|
||||
}
|
||||
65
vendor/github.com/issue9/identicon/polygon.go
generated
vendored
65
vendor/github.com/issue9/identicon/polygon.go
generated
vendored
|
|
@ -1,65 +0,0 @@
|
|||
// SPDX-License-Identifier: MIT
|
||||
|
||||
package identicon
|
||||
|
||||
var (
|
||||
// 4 个元素分别表示 cos(0),cos(90),cos(180),cos(270)
|
||||
cos = []int{1, 0, -1, 0}
|
||||
|
||||
// 4 个元素分别表示 sin(0),sin(90),sin(180),sin(270)
|
||||
sin = []int{0, 1, 0, -1}
|
||||
)
|
||||
|
||||
// 将 points 中的所有点，以 x,y 为原点旋转 angle 个角度。
|
||||
// angle 取值只能是 [0,1,2,3]，分别表示 [0，90，180，270]
|
||||
func rotate(points []int, x, y int, angle int) {
|
||||
if angle < 0 || angle > 3 {
|
||||
panic("rotate:参数angle必须0,1,2,3三值之一")
|
||||
}
|
||||
|
||||
for i := 0; i < len(points); i += 2 {
|
||||
px, py := points[i]-x, points[i+1]-y
|
||||
points[i] = px*cos[angle] - py*sin[angle] + x
|
||||
points[i+1] = px*sin[angle] + py*cos[angle] + y
|
||||
}
|
||||
}
|
||||
|
||||
// 判断某个点是否在多边形之内，不包含构成多边形的线和点
|
||||
// x,y 需要判断的点坐标
|
||||
// points 组成多边形的所顶点，每两个元素表示一点顶点，其中最后一个顶点必须与第一个顶点相同。
|
||||
func pointInPolygon(x, y int, points []int) bool {
|
||||
if len(points) < 8 { // 只有2个以上的点，才能组成闭合多边形
|
||||
return false
|
||||
}
|
||||
|
||||
// 大致算法如下：
|
||||
// 把整个平面以给定的测试点为原点分两部分:
|
||||
// - y>0，包含(x>0 && y==0)
|
||||
// - y<0，包含(x<0 && y==0)
|
||||
// 依次扫描每一个点，当该点与前一个点处于不同部分时（即一个在 y>0 区，一个在 y<0 区），
|
||||
// 则判断从前一点到当前点是顺时针还是逆时针（以给定的测试点为原点），如果是顺时针 r++，否则 r--。
|
||||
// 结果为：2==abs(r)。
|
||||
|
||||
r := 0
|
||||
x1, y1 := points[0], points[1]
|
||||
prev := (y1 > y) || ((x1 > x) && (y1 == y))
|
||||
for i := 2; i < len(points); i += 2 {
|
||||
x2, y2 := points[i], points[i+1]
|
||||
curr := (y2 > y) || ((x2 > x) && (y2 == y))
|
||||
|
||||
if curr == prev {
|
||||
x1, y1 = x2, y2
|
||||
continue
|
||||
}
|
||||
|
||||
if mul := (x1-x)*(y2-y) - (x2-x)*(y1-y); mul >= 0 {
|
||||
r++
|
||||
} else if mul < 0 {
|
||||
r--
|
||||
}
|
||||
x1, y1 = x2, y2
|
||||
prev = curr
|
||||
}
|
||||
|
||||
return r == 2 || r == -2
|
||||
}
|
||||
3
vendor/modules.txt
vendored
3
vendor/modules.txt
vendored
|
|
@ -507,9 +507,6 @@ github.com/hashicorp/hcl/json/token
|
|||
github.com/huandu/xstrings
|
||||
# github.com/imdario/mergo v0.3.12
|
||||
github.com/imdario/mergo
|
||||
# github.com/issue9/identicon v1.2.0
|
||||
## explicit
|
||||
github.com/issue9/identicon
|
||||
# github.com/jaytaylor/html2text v0.0.0-20200412013138-3577fbdbcff7
|
||||
## explicit
|
||||
github.com/jaytaylor/html2text
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue