Added all required dependencies
This commit is contained in:
Thomas Boerger
parent
78f86abba4
commit
1ebb35b988
660 changed files with 502447 additions and 0 deletions
22
vendor/github.com/issue9/identicon/LICENSE
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22
vendor/github.com/issue9/identicon/LICENSE
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@ -0,0 +1,22 @@
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The MIT License (MIT)
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Copyright (c) 2015 caixw
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
|
||||
furnished to do so, subject to the following conditions:
|
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|
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The above copyright notice and this permission notice shall be included in all
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||||
copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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40
vendor/github.com/issue9/identicon/README.md
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40
vendor/github.com/issue9/identicon/README.md
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identicon [](https://travis-ci.org/issue9/identicon)
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======
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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。
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```go
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// 根据用户访问的IP，为其生成一张头像
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img, _ := identicon.Make(128, color.NRGBA{},color.NRGBA{}, []byte("192.168.1.1"))
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fi, _ := os.Create("/tmp/u1.png")
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png.Encode(fi, img)
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fi.Close()
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// 或者
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ii, _ := identicon.New(128, color.NRGBA{}, color.NRGBA{}, color.NRGBA{}, color.NRGBA{})
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img := ii.Make([]byte("192.168.1.1"))
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img = ii.Make([]byte("192.168.1.2"))
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```
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### 安装
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```shell
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go get github.com/issue9/identicon
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```
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### 文档
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[](http://gowalker.org/github.com/issue9/identicon)
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[](https://godoc.org/github.com/issue9/identicon)
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### 版权
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本项目采用[MIT](http://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。
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438
vendor/github.com/issue9/identicon/block.go
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438
vendor/github.com/issue9/identicon/block.go
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// Copyright 2015 by caixw, All rights reserved
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// Use of this source code is governed by a MIT
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// license that can be found in the LICENSE file.
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package identicon
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import (
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"image"
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"sync"
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)
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var pool = sync.Pool{
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New: func() interface{} { return make([]float64, 0, 10) },
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}
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var (
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// 可以出现在中间的方块，一般为了美观，都是对称图像。
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centerBlocks = []blockFunc{b0, b1, b2, b3}
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// 所有方块
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blocks = []blockFunc{b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14, b15, b16}
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)
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// 所有block函数的类型
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type blockFunc func(img *image.Paletted, x, y, size float64, angle int)
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// 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
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func drawBlock(img *image.Paletted, x, y, size float64, angle int, points []float64) {
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if angle > 0 { // 0角度不需要转换
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// 中心坐标与x,y的距离，方便下面指定中心坐标(x+m,y+m)，
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// 0.5的偏移值不能少，否则坐靠右，非正中央
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m := size/2 - 0.5
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rotate(points, x+m, y+m, angle)
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}
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for i := x; i < x+size; i++ {
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for j := y; j < y+size; j++ {
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if pointInPolygon(i, j, points) {
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img.SetColorIndex(int(i), int(j), 1)
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}
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}
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}
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}
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// 全空白
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//
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// --------
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// | |
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// | |
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// | |
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// --------
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func b0(img *image.Paletted, x, y, size float64, angle int) {
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}
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// 全填充正方形
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//
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// --------
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// |######|
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// |######|
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// |######|
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// --------
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func b1(img *image.Paletted, x, y, size float64, angle int) {
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isize := int(size)
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ix := int(x)
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iy := int(y)
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for i := ix + 1; i < ix+isize; i++ {
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for j := iy + 1; j < iy+isize; j++ {
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img.SetColorIndex(i, j, 1)
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}
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}
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}
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// 中间小方块
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// ----------
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// | |
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// | #### |
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// | #### |
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// | |
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// ----------
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func b2(img *image.Paletted, x, y, size float64, angle int) {
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l := size / 4
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x = x + l
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y = y + l
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for i := x; i < x+2*l; i++ {
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for j := y; j < y+2*l; j++ {
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img.SetColorIndex(int(i), int(j), 1)
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}
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}
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}
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// 菱形
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//
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// ---------
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// | # |
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// | ### |
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// | ##### |
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// |#######|
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// | ##### |
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// | ### |
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// | # |
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// ---------
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func b3(img *image.Paletted, x, y, size float64, angle int) {
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m := size / 2
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points := pool.Get().([]float64)[:0]
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drawBlock(img, x, y, size, 0, append(points,
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x+m, y,
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x+size, y+m,
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x+m, y+size,
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x, y+m,
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x+m, y,
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))
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pool.Put(points)
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}
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// b4
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//
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// -------
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// |#####|
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// |#### |
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// |### |
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// |## |
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// |# |
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// |------
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func b4(img *image.Paletted, x, y, size float64, angle int) {
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points := pool.Get().([]float64)[:0]
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drawBlock(img, x, y, size, angle, append(points,
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x, y,
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x+size, y,
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x, y+size,
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x, y,
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))
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pool.Put(points)
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}
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// b5
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//
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// ---------
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// | # |
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// | ### |
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// | ##### |
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// |#######|
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func b5(img *image.Paletted, x, y, size float64, angle int) {
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points := pool.Get().([]float64)[:0]
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m := size / 2
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drawBlock(img, x, y, size, angle, append(points,
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x+m, y,
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x+size,
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y+size,
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x, y+size,
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x+m, y,
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))
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pool.Put(points)
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}
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// b6 矩形
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//
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// --------
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// |### |
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// |### |
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// |### |
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// --------
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func b6(img *image.Paletted, x, y, size float64, angle int) {
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points := pool.Get().([]float64)[:0]
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m := size / 2
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drawBlock(img, x, y, size, angle, append(points,
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x, y,
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x+m, y,
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x+m, y+size,
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x, y+size,
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x, y,
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))
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pool.Put(points)
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}
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// b7 斜放的锥形
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//
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// ---------
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// | # |
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// | ## |
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// | #####|
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// | ####|
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// |--------
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func b7(img *image.Paletted, x, y, size float64, angle int) {
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points := pool.Get().([]float64)[:0]
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m := size / 2
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drawBlock(img, x, y, size, angle, append(points,
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x, y,
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x+size, y+m,
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x+size, y+size,
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x+m, y+size,
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x, y,
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))
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pool.Put(points)
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}
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// b8 三个堆叠的三角形
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//
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// -----------
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// | # |
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// | ### |
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// | ##### |
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// | # # |
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// | ### ### |
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// |#########|
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// -----------
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func b8(img *image.Paletted, x, y, size float64, angle int) {
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points := pool.Get().([]float64)[:0]
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m := size / 2
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mm := m / 2
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// 顶部三角形
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drawBlock(img, x, y, size, angle, append(points,
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x+m, y,
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x+3*mm, y+m,
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x+mm, y+m,
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x+m, y,
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))
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// 底下左边
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drawBlock(img, x, y, size, angle, append(points[:0],
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x+mm, y+m,
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x+m, y+size,
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x, y+size,
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x+mm, y+m,
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))
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// 底下右边
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drawBlock(img, x, y, size, angle, append(points[:0],
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x+3*mm, y+m,
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x+size, y+size,
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x+m, y+size,
|
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x+3*mm, y+m,
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))
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pool.Put(points)
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}
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|
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// b9 斜靠的三角形
|
||||
//
|
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// ---------
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// |# |
|
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// | #### |
|
||||
// | #####|
|
||||
// | #### |
|
||||
// | # |
|
||||
// ---------
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func b9(img *image.Paletted, x, y, size float64, angle int) {
|
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points := pool.Get().([]float64)[:0]
|
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m := size / 2
|
||||
drawBlock(img, x, y, size, angle, append(points,
|
||||
x, y,
|
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x+size, y+m,
|
||||
x+m, y+size,
|
||||
x, y,
|
||||
))
|
||||
|
||||
pool.Put(points)
|
||||
}
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||||
|
||||
// b10
|
||||
//
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||||
// ----------
|
||||
// | ####|
|
||||
// | ### |
|
||||
// | ## |
|
||||
// | # |
|
||||
// |#### |
|
||||
// |### |
|
||||
// |## |
|
||||
// |# |
|
||||
// ----------
|
||||
func b10(img *image.Paletted, x, y, size float64, angle int) {
|
||||
points := pool.Get().([]float64)[:0]
|
||||
m := size / 2
|
||||
drawBlock(img, x, y, size, angle, append(points,
|
||||
x+m, y,
|
||||
x+size, y,
|
||||
x+m, y+m,
|
||||
x+m, y,
|
||||
))
|
||||
|
||||
drawBlock(img, x, y, size, angle, append(points[:0],
|
||||
x, y+m,
|
||||
x+m, y+m,
|
||||
x, y+size,
|
||||
x, y+m,
|
||||
))
|
||||
|
||||
pool.Put(points)
|
||||
}
|
||||
|
||||
// b11 左上角1/4大小的方块
|
||||
//
|
||||
// ----------
|
||||
// |#### |
|
||||
// |#### |
|
||||
// |#### |
|
||||
// | |
|
||||
// | |
|
||||
// ----------
|
||||
func b11(img *image.Paletted, x, y, size float64, angle int) {
|
||||
points := pool.Get().([]float64)[:0]
|
||||
m := size / 2
|
||||
drawBlock(img, x, y, size, angle, append(points,
|
||||
x, y,
|
||||
x+m, y,
|
||||
x+m, y+m,
|
||||
x, y+m,
|
||||
x, y,
|
||||
))
|
||||
|
||||
pool.Put(points)
|
||||
}
|
||||
|
||||
// b12
|
||||
//
|
||||
// -----------
|
||||
// | |
|
||||
// | |
|
||||
// |#########|
|
||||
// | ##### |
|
||||
// | # |
|
||||
// -----------
|
||||
func b12(img *image.Paletted, x, y, size float64, angle int) {
|
||||
points := pool.Get().([]float64)[:0]
|
||||
m := size / 2
|
||||
drawBlock(img, x, y, size, angle, append(points,
|
||||
x, y+m,
|
||||
x+size, y+m,
|
||||
x+m, y+size,
|
||||
x, y+m,
|
||||
))
|
||||
|
||||
pool.Put(points)
|
||||
}
|
||||
|
||||
// b13
|
||||
//
|
||||
// -----------
|
||||
// | |
|
||||
// | |
|
||||
// | # |
|
||||
// | ##### |
|
||||
// |#########|
|
||||
// -----------
|
||||
func b13(img *image.Paletted, x, y, size float64, angle int) {
|
||||
points := pool.Get().([]float64)[:0]
|
||||
m := size / 2
|
||||
drawBlock(img, x, y, size, angle, append(points,
|
||||
x+m, y+m,
|
||||
x+size, y+size,
|
||||
x, y+size,
|
||||
x+m, y+m,
|
||||
))
|
||||
|
||||
pool.Put(points)
|
||||
}
|
||||
|
||||
// b14
|
||||
//
|
||||
// ---------
|
||||
// | # |
|
||||
// | ### |
|
||||
// |#### |
|
||||
// | |
|
||||
// | |
|
||||
// ---------
|
||||
func b14(img *image.Paletted, x, y, size float64, angle int) {
|
||||
points := pool.Get().([]float64)[:0]
|
||||
m := size / 2
|
||||
drawBlock(img, x, y, size, angle, append(points,
|
||||
x+m, y,
|
||||
x+m, y+m,
|
||||
x, y+m,
|
||||
x+m, y,
|
||||
))
|
||||
|
||||
pool.Put(points)
|
||||
}
|
||||
|
||||
// b15
|
||||
//
|
||||
// ----------
|
||||
// |##### |
|
||||
// |### |
|
||||
// |# |
|
||||
// | |
|
||||
// | |
|
||||
// ----------
|
||||
func b15(img *image.Paletted, x, y, size float64, angle int) {
|
||||
points := pool.Get().([]float64)[:0]
|
||||
m := size / 2
|
||||
drawBlock(img, x, y, size, angle, append(points,
|
||||
x, y,
|
||||
x+m, y,
|
||||
x, y+m,
|
||||
x, y,
|
||||
))
|
||||
|
||||
pool.Put(points)
|
||||
}
|
||||
|
||||
// b16
|
||||
//
|
||||
// ---------
|
||||
// | # |
|
||||
// | ##### |
|
||||
// |#######|
|
||||
// | # |
|
||||
// | ##### |
|
||||
// |#######|
|
||||
// ---------
|
||||
func b16(img *image.Paletted, x, y, size float64, angle int) {
|
||||
points := pool.Get().([]float64)[:0]
|
||||
m := size / 2
|
||||
drawBlock(img, x, y, size, angle, append(points,
|
||||
x+m, y,
|
||||
x+size, y+m,
|
||||
x, y+m,
|
||||
x+m, y,
|
||||
))
|
||||
|
||||
drawBlock(img, x, y, size, angle, append(points[:0],
|
||||
x+m, y+m,
|
||||
x+size, y+size,
|
||||
x, y+size,
|
||||
x+m, y+m,
|
||||
))
|
||||
|
||||
pool.Put(points)
|
||||
}
|
||||
37
vendor/github.com/issue9/identicon/doc.go
generated
vendored
Normal file
37
vendor/github.com/issue9/identicon/doc.go
generated
vendored
Normal file
|
|
@ -0,0 +1,37 @@
|
|||
// Copyright 2015 by caixw, All rights reserved.
|
||||
// Use of this source code is governed by a MIT
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// 一个基于hash值生成随机图像的包。
|
||||
//
|
||||
// 关于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
|
||||
147
vendor/github.com/issue9/identicon/identicon.go
generated
vendored
Normal file
147
vendor/github.com/issue9/identicon/identicon.go
generated
vendored
Normal file
|
|
@ -0,0 +1,147 @@
|
|||
// Copyright 2015 by caixw, All rights reserved.
|
||||
// Use of this source code is governed by a MIT
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package identicon
|
||||
|
||||
import (
|
||||
"crypto/md5"
|
||||
"fmt"
|
||||
"image"
|
||||
"image/color"
|
||||
)
|
||||
|
||||
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
|
||||
}
|
||||
|
||||
// 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。
|
||||
// NOTE:前景色不要与背景色太相近。
|
||||
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]~[%v]之间，当前为[%v]", maxForeColors, len(fore))
|
||||
}
|
||||
|
||||
if size < minSize {
|
||||
return nil, fmt.Errorf("参数size的值(%v)不能小于%v", 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
|
||||
}
|
||||
|
||||
// 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)
|
||||
|
||||
// 第一个方块
|
||||
index := int(sum[0]+sum[1]+sum[2]+sum[3]) % len(blocks)
|
||||
b1 := blocks[index]
|
||||
|
||||
// 第二个方块
|
||||
index = int(sum[4]+sum[5]+sum[6]+sum[7]) % len(blocks)
|
||||
b2 := blocks[index]
|
||||
|
||||
// 中间方块
|
||||
index = int(sum[8]+sum[9]+sum[10]+sum[11]) % len(centerBlocks)
|
||||
c := centerBlocks[index]
|
||||
|
||||
// 旋转角度
|
||||
angle := int(sum[12]+sum[13]+sum[14]) % 4
|
||||
|
||||
// 根据最后一个字段，获取前景颜色
|
||||
index = int(sum[15]) % len(i.foreColors)
|
||||
|
||||
p := image.NewPaletted(i.rect, []color.Color{i.backColor, i.foreColors[index]})
|
||||
drawBlocks(p, i.size, c, b1, b2, angle)
|
||||
return p
|
||||
}
|
||||
|
||||
// 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) {
|
||||
if size < minSize {
|
||||
return nil, fmt.Errorf("参数size的值(%v)不能小于%v", size, minSize)
|
||||
}
|
||||
|
||||
h := md5.New()
|
||||
h.Write(data)
|
||||
sum := h.Sum(nil)
|
||||
|
||||
// 第一个方块
|
||||
index := int(sum[0]+sum[1]+sum[2]+sum[3]) % len(blocks)
|
||||
b1 := blocks[index]
|
||||
|
||||
// 第二个方块
|
||||
index = int(sum[4]+sum[5]+sum[6]+sum[7]) % len(blocks)
|
||||
b2 := blocks[index]
|
||||
|
||||
// 中间方块
|
||||
index = int(sum[8]+sum[9]+sum[10]+sum[11]) % len(centerBlocks)
|
||||
c := centerBlocks[index]
|
||||
|
||||
// 旋转角度
|
||||
angle := int(sum[12]+sum[13]+sum[14]+sum[15]) % 4
|
||||
|
||||
// 画布坐标从0开始，其长度应该是size-1
|
||||
p := image.NewPaletted(image.Rect(0, 0, size, size), []color.Color{back, fore})
|
||||
drawBlocks(p, size, c, b1, b2, angle)
|
||||
return p, 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。
|
||||
// angle为b1,b2的起始旋转角度。
|
||||
func drawBlocks(p *image.Paletted, size int, c, b1, b2 blockFunc, angle int) {
|
||||
// 每个格子的长宽。先转换成float，再计算！
|
||||
blockSize := float64(size) / 3
|
||||
twoBlockSize := 2 * blockSize
|
||||
|
||||
incr := func() { // 增加angle的值，但不会大于3
|
||||
angle++
|
||||
if angle > 3 {
|
||||
angle = 0
|
||||
}
|
||||
}
|
||||
|
||||
c(p, blockSize, blockSize, blockSize, 0)
|
||||
|
||||
b1(p, 0, 0, blockSize, angle)
|
||||
b2(p, blockSize, 0, blockSize, angle)
|
||||
|
||||
incr()
|
||||
b1(p, twoBlockSize, 0, blockSize, angle)
|
||||
b2(p, twoBlockSize, blockSize, blockSize, angle)
|
||||
|
||||
incr()
|
||||
b1(p, twoBlockSize, twoBlockSize, blockSize, angle)
|
||||
b2(p, blockSize, twoBlockSize, blockSize, angle)
|
||||
|
||||
incr()
|
||||
b1(p, 0, twoBlockSize, blockSize, angle)
|
||||
b2(p, 0, blockSize, blockSize, angle)
|
||||
}
|
||||
69
vendor/github.com/issue9/identicon/polygon.go
generated
vendored
Normal file
69
vendor/github.com/issue9/identicon/polygon.go
generated
vendored
Normal file
|
|
@ -0,0 +1,69 @@
|
|||
// Copyright 2015 by caixw, All rights reserved.
|
||||
// Use of this source code is governed by a MIT
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package identicon
|
||||
|
||||
var (
|
||||
// 4个元素分别表示cos(0),cos(90),cos(180),cos(270)
|
||||
cos = []float64{1, 0, -1, 0}
|
||||
|
||||
// 4个元素分别表示sin(0),sin(90),sin(180),sin(270)
|
||||
sin = []float64{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 []float64, x, y float64, 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 := points[i] - x
|
||||
py := 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 float64, y float64, points []float64) 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
|
||||
}
|
||||
|
||||
mul := (x1-x)*(y2-y) - (x2-x)*(y1-y)
|
||||
if mul > 0 {
|
||||
r++
|
||||
} else if mul < 0 {
|
||||
r--
|
||||
}
|
||||
x1, y1 = x2, y2
|
||||
prev = curr
|
||||
}
|
||||
|
||||
return r == 2 || r == -2
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue