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gitea/modules/avatar/identicon/block.go

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// 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)
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package identicon
import "image"
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var (
// the blocks can appear in center, these blocks can be more beautiful
centerBlocks = []blockFunc{b0, b1, b2, b3, b19, b26, b27}
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// 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}
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)
type blockFunc func(img *image.Paletted, x, y, size, angle int)
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// draw a polygon by points, and the polygon is rotated by angle.
func drawBlock(img *image.Paletted, x, y, size, angle int, points []int) {
if angle != 0 {
m := size / 2
rotate(points, m, m, angle)
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}
for i := 0; i < size; i++ {
for j := 0; j < size; j++ {
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if pointInPolygon(i, j, points) {
img.SetColorIndex(x+i, y+j, 1)
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}
}
}
}
// blank
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//
// --------
// | |
// | |
// | |
// --------
func b0(img *image.Paletted, x, y, size, angle int) {}
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// full-filled
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//
// --------
// |######|
// |######|
// |######|
// --------
func b1(img *image.Paletted, x, y, size, angle int) {
for i := x; i < x+size; i++ {
for j := y; j < y+size; j++ {
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img.SetColorIndex(i, j, 1)
}
}
}
// a small block
//
// ----------
// | |
// | #### |
// | #### |
// | |
// ----------
func b2(img *image.Paletted, x, y, size, angle int) {
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l := size / 4
x += l
y += l
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for i := x; i < x+2*l; i++ {
for j := y; j < y+2*l; j++ {
img.SetColorIndex(i, j, 1)
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}
}
}
// diamond
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//
// ---------
// | # |
// | ### |
// | ##### |
// |#######|
// | ##### |
// | ### |
// | # |
// ---------
func b3(img *image.Paletted, x, y, size, angle int) {
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m := size / 2
drawBlock(img, x, y, size, 0, []int{
m, 0,
size, m,
m, size,
0, m,
m, 0,
})
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}
// b4
//
// -------
// |#####|
// |#### |
// |### |
// |## |
// |# |
// |------
func b4(img *image.Paletted, x, y, size, angle int) {
drawBlock(img, x, y, size, angle, []int{
0, 0,
size, 0,
0, size,
0, 0,
})
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}
// b5
//
// ---------
// | # |
// | ### |
// | ##### |
// |#######|
func b5(img *image.Paletted, x, y, size, angle int) {
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m := size / 2
drawBlock(img, x, y, size, angle, []int{
m, 0,
size, size,
0, size,
m, 0,
})
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}
// b6
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//
// --------
// |### |
// |### |
// |### |
// --------
func b6(img *image.Paletted, x, y, size, angle int) {
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m := size / 2
drawBlock(img, x, y, size, angle, []int{
0, 0,
m, 0,
m, size,
0, size,
0, 0,
})
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}
// b7 italic cone
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//
// ---------
// | # |
// | ## |
// | #####|
// | ####|
// |--------
func b7(img *image.Paletted, x, y, size, angle int) {
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m := size / 2
drawBlock(img, x, y, size, angle, []int{
0, 0,
size, m,
size, size,
m, size,
0, 0,
})
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}
// b8 three small triangles
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//
// -----------
// | # |
// | ### |
// | ##### |
// | # # |
// | ### ### |
// |#########|
// -----------
func b8(img *image.Paletted, x, y, size, angle int) {
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m := size / 2
mm := m / 2
// top
drawBlock(img, x, y, size, angle, []int{
m, 0,
3 * mm, m,
mm, m,
m, 0,
})
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// bottom left
drawBlock(img, x, y, size, angle, []int{
mm, m,
m, size,
0, size,
mm, m,
})
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// bottom right
drawBlock(img, x, y, size, angle, []int{
3 * mm, m,
size, size,
m, size,
3 * mm, m,
})
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}
// b9 italic triangle
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//
// ---------
// |# |
// | #### |
// | #####|
// | #### |
// | # |
// ---------
func b9(img *image.Paletted, x, y, size, angle int) {
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m := size / 2
drawBlock(img, x, y, size, angle, []int{
0, 0,
size, m,
m, size,
0, 0,
})
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}
// b10
//
// ----------
// | ####|
// | ### |
// | ## |
// | # |
// |#### |
// |### |
// |## |
// |# |
// ----------
func b10(img *image.Paletted, x, y, size, angle int) {
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m := size / 2
drawBlock(img, x, y, size, angle, []int{
m, 0,
size, 0,
m, m,
m, 0,
})
drawBlock(img, x, y, size, angle, []int{
0, m,
m, m,
0, size,
0, m,
})
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}
// b11
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//
// ----------
// |#### |
// |#### |
// |#### |
// | |
// | |
// ----------
func b11(img *image.Paletted, x, y, size, angle int) {
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m := size / 2
drawBlock(img, x, y, size, angle, []int{
0, 0,
m, 0,
m, m,
0, m,
0, 0,
})
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}
// b12
//
// -----------
// | |
// | |
// |#########|
// | ##### |
// | # |
// -----------
func b12(img *image.Paletted, x, y, size, angle int) {
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m := size / 2
drawBlock(img, x, y, size, angle, []int{
0, m,
size, m,
m, size,
0, m,
})
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}
// b13
//
// -----------
// | |
// | |
// | # |
// | ##### |
// |#########|
// -----------
func b13(img *image.Paletted, x, y, size, angle int) {
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m := size / 2
drawBlock(img, x, y, size, angle, []int{
m, m,
size, size,
0, size,
m, m,
})
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}
// b14
//
// ---------
// | # |
// | ### |
// |#### |
// | |
// | |
// ---------
func b14(img *image.Paletted, x, y, size, angle int) {
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m := size / 2
drawBlock(img, x, y, size, angle, []int{
m, 0,
m, m,
0, m,
m, 0,
})
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}
// b15
//
// ----------
// |##### |
// |### |
// |# |
// | |
// | |
// ----------
func b15(img *image.Paletted, x, y, size, angle int) {
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m := size / 2
drawBlock(img, x, y, size, angle, []int{
0, 0,
m, 0,
0, m,
0, 0,
})
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}
// b16
//
// ---------
// | # |
// | ##### |
// |#######|
// | # |
// | ##### |
// |#######|
// ---------
func b16(img *image.Paletted, x, y, size, angle int) {
m := size / 2
drawBlock(img, x, y, size, angle, []int{
m, 0,
size, m,
0, m,
m, 0,
})
drawBlock(img, x, y, size, angle, []int{
m, m,
size, size,
0, size,
m, m,
})
}
// b17
//
// ----------
// |##### |
// |### |
// |# |
// | ##|
// | ##|
// ----------
func b17(img *image.Paletted, x, y, size, angle int) {
m := size / 2
drawBlock(img, x, y, size, angle, []int{
0, 0,
m, 0,
0, m,
0, 0,
})
quarter := size / 4
drawBlock(img, x, y, size, angle, []int{
size - quarter, size - quarter,
size, size - quarter,
size, size,
size - quarter, size,
size - quarter, size - quarter,
})
}
// b18
//
// ----------
// |##### |
// |#### |
// |### |
// |## |
// |# |
// ----------
func b18(img *image.Paletted, x, y, size, angle int) {
m := size / 2
drawBlock(img, x, y, size, angle, []int{
0, 0,
m, 0,
0, size,
0, 0,
})
}
// b19
//
// ----------
// |########|
// |### ###|
// |# #|
// |### ###|
// |########|
// ----------
func b19(img *image.Paletted, x, y, size, angle int) {
m := size / 2
drawBlock(img, x, y, size, angle, []int{
0, 0,
m, 0,
0, m,
0, 0,
})
drawBlock(img, x, y, size, angle, []int{
m, 0,
size, 0,
size, m,
m, 0,
})
drawBlock(img, x, y, size, angle, []int{
size, m,
size, size,
m, size,
size, m,
})
drawBlock(img, x, y, size, angle, []int{
0, m,
m, size,
0, size,
0, m,
})
}
// b20
//
// ----------
// | ## |
// |### |
// |## |
// |## |
// |# |
// ----------
func b20(img *image.Paletted, x, y, size, angle int) {
m := size / 2
q := size / 4
drawBlock(img, x, y, size, angle, []int{
q, 0,
0, size,
0, m,
q, 0,
})
}
// b21
//
// ----------
// | #### |
// |## #####|
// |## ##|
// |## |
// |# |
// ----------
func b21(img *image.Paletted, x, y, size, angle int) {
m := size / 2
q := size / 4
drawBlock(img, x, y, size, angle, []int{
q, 0,
0, size,
0, m,
q, 0,
})
drawBlock(img, x, y, size, angle, []int{
q, 0,
size, q,
size, m,
q, 0,
})
}
// b22
//
// ----------
// | #### |
// |## ### |
// |## ##|
// |## ##|
// |# #|
// ----------
func b22(img *image.Paletted, x, y, size, angle int) {
m := size / 2
q := size / 4
drawBlock(img, x, y, size, angle, []int{
q, 0,
0, size,
0, m,
q, 0,
})
drawBlock(img, x, y, size, angle, []int{
q, 0,
size, q,
size, size,
q, 0,
})
}
// b23
//
// ----------
// | #######|
// |### #|
// |## |
// |## |
// |# |
// ----------
func b23(img *image.Paletted, x, y, size, angle int) {
m := size / 2
q := size / 4
drawBlock(img, x, y, size, angle, []int{
q, 0,
0, size,
0, m,
q, 0,
})
drawBlock(img, x, y, size, angle, []int{
q, 0,
size, 0,
size, q,
q, 0,
})
}
// b24
//
// ----------
// | ## ###|
// |### ###|
// |## ## |
// |## ## |
// |# # |
// ----------
func b24(img *image.Paletted, x, y, size, angle int) {
m := size / 2
q := size / 4
drawBlock(img, x, y, size, angle, []int{
q, 0,
0, size,
0, m,
q, 0,
})
drawBlock(img, x, y, size, angle, []int{
m, 0,
size, 0,
m, size,
m, 0,
})
}
// b25
//
// ----------
// |# #|
// |## ###|
// |## ## |
// |###### |
// |#### |
// ----------
func b25(img *image.Paletted, x, y, size, angle int) {
m := size / 2
q := size / 4
drawBlock(img, x, y, size, angle, []int{
0, 0,
0, size,
q, size,
0, 0,
})
drawBlock(img, x, y, size, angle, []int{
0, m,
size, 0,
q, size,
0, m,
})
}
// b26
//
// ----------
// |# #|
// |### ###|
// | #### |
// |### ###|
// |# #|
// ----------
func b26(img *image.Paletted, x, y, size, angle int) {
m := size / 2
q := size / 4
drawBlock(img, x, y, size, angle, []int{
0, 0,
m, q,
q, m,
0, 0,
})
drawBlock(img, x, y, size, angle, []int{
size, 0,
m + q, m,
m, q,
size, 0,
})
drawBlock(img, x, y, size, angle, []int{
size, size,
m, m + q,
q + m, m,
size, size,
})
drawBlock(img, x, y, size, angle, []int{
0, size,
q, m,
m, q + m,
0, size,
})
}
// b27
//
// ----------
// |########|
// |## ###|
// |# #|
// |### ##|
// |########|
// ----------
func b27(img *image.Paletted, x, y, size, angle int) {
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m := size / 2
q := size / 4
drawBlock(img, x, y, size, angle, []int{
0, 0,
size, 0,
0, q,
0, 0,
})
drawBlock(img, x, y, size, angle, []int{
q + m, 0,
size, 0,
size, size,
q + m, 0,
})
drawBlock(img, x, y, size, angle, []int{
size, q + m,
size, size,
0, size,
size, q + m,
})
drawBlock(img, x, y, size, angle, []int{
0, size,
0, 0,
q, size,
0, size,
})
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}