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forgejo/vendor/github.com/issue9/identicon/block.go
2016-11-04 08:43:11 +01:00

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// 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)
}