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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，否则坐标靠右，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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// b9 斜靠的三角形
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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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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
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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+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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// b10
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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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// ----------
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func b10(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, y,
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x+m, y+m,
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x+m, y,
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))
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drawBlock(img, x, y, size, angle, append(points[:0],
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x, y+m,
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x+m, y+m,
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x, y+size,
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x, y+m,
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))
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pool.Put(points)
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}
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// b11 左上角1/4大小的方块
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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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// | |
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// ----------
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func b11(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+m,
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x, y+m,
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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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// b12
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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 b12(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+m,
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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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))
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pool.Put(points)
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}
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// b13
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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 b13(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+m,
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x+size, y+size,
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x, y+size,
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x+m, y+m,
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))
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pool.Put(points)
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}
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// b14
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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 b14(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+m, y+m,
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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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// b15
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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 b15(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, y+m,
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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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// b16
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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 b16(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, y+m,
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x, y+m,
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x+m, y,
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))
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drawBlock(img, x, y, size, angle, append(points[:0],
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x+m, y+m,
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x+size, y+size,
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x, y+size,
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x+m, y+m,
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))
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pool.Put(points)
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}
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