mirror of
https://github.com/go-gitea/gitea.git
synced 2024-11-25 09:40:56 +08:00
439 lines
7.4 KiB
Go
439 lines
7.4 KiB
Go
// 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 (
|
||
"image"
|
||
"sync"
|
||
)
|
||
|
||
var pool = sync.Pool{
|
||
New: func() interface{} { return make([]float64, 0, 10) },
|
||
}
|
||
|
||
var (
|
||
// 可以出现在中间的方块，一般为了美观，都是对称图像。
|
||
centerBlocks = []blockFunc{b0, b1, b2, b3}
|
||
|
||
// 所有方块
|
||
blocks = []blockFunc{b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14, b15, b16}
|
||
)
|
||
|
||
// 所有 block 函数的类型
|
||
type blockFunc func(img *image.Paletted, x, y, size float64, 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
|
||
func drawBlock(img *image.Paletted, x, y, size float64, angle int, points []float64) {
|
||
if angle > 0 { // 0 角度不需要转换
|
||
// 中心坐标与 x、y 的距离，方便下面指定中心坐标(x+m,y+m)，
|
||
// 0.5 的偏移值不能少，否则坐标靠右，非正中央
|
||
m := size/2 - 0.5
|
||
rotate(points, x+m, y+m, angle)
|
||
}
|
||
|
||
for i := x; i < x+size; i++ {
|
||
for j := y; j < y+size; j++ {
|
||
if pointInPolygon(i, j, points) {
|
||
img.SetColorIndex(int(i), int(j), 1)
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// 全空白
|
||
//
|
||
// --------
|
||
// | |
|
||
// | |
|
||
// | |
|
||
// --------
|
||
func b0(img *image.Paletted, x, y, size float64, angle int) {
|
||
}
|
||
|
||
// 全填充正方形
|
||
//
|
||
// --------
|
||
// |######|
|
||
// |######|
|
||
// |######|
|
||
// --------
|
||
func b1(img *image.Paletted, x, y, size float64, angle int) {
|
||
isize := int(size)
|
||
ix := int(x)
|
||
iy := int(y)
|
||
for i := ix + 1; i < ix+isize; i++ {
|
||
for j := iy + 1; j < iy+isize; j++ {
|
||
img.SetColorIndex(i, j, 1)
|
||
}
|
||
}
|
||
}
|
||
|
||
// 中间小方块
|
||
// ----------
|
||
// | |
|
||
// | #### |
|
||
// | #### |
|
||
// | |
|
||
// ----------
|
||
func b2(img *image.Paletted, x, y, size float64, angle int) {
|
||
l := size / 4
|
||
x = x + l
|
||
y = y + l
|
||
|
||
for i := x; i < x+2*l; i++ {
|
||
for j := y; j < y+2*l; j++ {
|
||
img.SetColorIndex(int(i), int(j), 1)
|
||
}
|
||
}
|
||
}
|
||
|
||
// 菱形
|
||
//
|
||
// ---------
|
||
// | # |
|
||
// | ### |
|
||
// | ##### |
|
||
// |#######|
|
||
// | ##### |
|
||
// | ### |
|
||
// | # |
|
||
// ---------
|
||
func b3(img *image.Paletted, x, y, size float64, angle int) {
|
||
m := size / 2
|
||
points := pool.Get().([]float64)[:0]
|
||
|
||
drawBlock(img, x, y, size, 0, append(points,
|
||
x+m, y,
|
||
x+size, y+m,
|
||
x+m, y+size,
|
||
x, y+m,
|
||
x+m, y,
|
||
))
|
||
|
||
pool.Put(points)
|
||
}
|
||
|
||
// b4
|
||
//
|
||
// -------
|
||
// |#####|
|
||
// |#### |
|
||
// |### |
|
||
// |## |
|
||
// |# |
|
||
// |------
|
||
func b4(img *image.Paletted, x, y, size float64, angle int) {
|
||
points := pool.Get().([]float64)[:0]
|
||
drawBlock(img, x, y, size, angle, append(points,
|
||
x, y,
|
||
x+size, y,
|
||
x, y+size,
|
||
x, y,
|
||
))
|
||
|
||
pool.Put(points)
|
||
}
|
||
|
||
// b5
|
||
//
|
||
// ---------
|
||
// | # |
|
||
// | ### |
|
||
// | ##### |
|
||
// |#######|
|
||
func b5(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+size,
|
||
x, y+size,
|
||
x+m, y,
|
||
))
|
||
|
||
pool.Put(points)
|
||
}
|
||
|
||
// b6 矩形
|
||
//
|
||
// --------
|
||
// |### |
|
||
// |### |
|
||
// |### |
|
||
// --------
|
||
func b6(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+size,
|
||
x, y+size,
|
||
x, y,
|
||
))
|
||
|
||
pool.Put(points)
|
||
}
|
||
|
||
// b7 斜放的锥形
|
||
//
|
||
// ---------
|
||
// | # |
|
||
// | ## |
|
||
// | #####|
|
||
// | ####|
|
||
// |--------
|
||
func b7(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+size, y+m,
|
||
x+size, y+size,
|
||
x+m, y+size,
|
||
x, y,
|
||
))
|
||
|
||
pool.Put(points)
|
||
}
|
||
|
||
// b8 三个堆叠的三角形
|
||
//
|
||
// -----------
|
||
// | # |
|
||
// | ### |
|
||
// | ##### |
|
||
// | # # |
|
||
// | ### ### |
|
||
// |#########|
|
||
// -----------
|
||
func b8(img *image.Paletted, x, y, size float64, angle int) {
|
||
points := pool.Get().([]float64)[:0]
|
||
m := size / 2
|
||
mm := m / 2
|
||
|
||
// 顶部三角形
|
||
drawBlock(img, x, y, size, angle, append(points,
|
||
x+m, y,
|
||
x+3*mm, y+m,
|
||
x+mm, y+m,
|
||
x+m, y,
|
||
))
|
||
|
||
// 底下左边
|
||
drawBlock(img, x, y, size, angle, append(points[:0],
|
||
x+mm, y+m,
|
||
x+m, y+size,
|
||
x, y+size,
|
||
x+mm, y+m,
|
||
))
|
||
|
||
// 底下右边
|
||
drawBlock(img, x, y, size, angle, append(points[:0],
|
||
x+3*mm, y+m,
|
||
x+size, y+size,
|
||
x+m, y+size,
|
||
x+3*mm, y+m,
|
||
))
|
||
|
||
pool.Put(points)
|
||
}
|
||
|
||
// b9 斜靠的三角形
|
||
//
|
||
// ---------
|
||
// |# |
|
||
// | #### |
|
||
// | #####|
|
||
// | #### |
|
||
// | # |
|
||
// ---------
|
||
func b9(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+size, y+m,
|
||
x+m, y+size,
|
||
x, y,
|
||
))
|
||
|
||
pool.Put(points)
|
||
}
|
||
|
||
// b10
|
||
//
|
||
// ----------
|
||
// | ####|
|
||
// | ### |
|
||
// | ## |
|
||
// | # |
|
||
// |#### |
|
||
// |### |
|
||
// |## |
|
||
// |# |
|
||
// ----------
|
||
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)
|
||
}
|