Abit/app/src/main/java/ch/dissem/apps/abit/Identicon.kt

99 lines
3.3 KiB
Kotlin

/*
* Copyright 2015 Christian Basler
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ch.dissem.apps.abit
import android.graphics.*
import android.graphics.drawable.Drawable
import android.text.TextPaint
import ch.dissem.bitmessage.entity.BitmessageAddress
/**
* @author Christian Basler
*/
class Identicon(input: BitmessageAddress) : Drawable() {
private val paint = Paint().apply {
style = Paint.Style.FILL
isAntiAlias = true
}
private val hash = input.ripe
private val isChan = input.isChan
private val fields = Array(SIZE) { BooleanArray(SIZE) }.apply {
for (row in 0 until SIZE) {
if (!isChan || row < 5 || row > 6) {
for (column in 0..CENTER_COLUMN) {
if ((row - SIZE / 2) * (row - SIZE / 2) + (column - SIZE / 2) * (column - SIZE / 2) < SIZE / 2 * SIZE / 2) {
this[row][column] = hash[(row * CENTER_COLUMN + column) % hash.size] >= 0
this[row][SIZE - column - 1] = this[row][column]
}
}
}
}
}
private val color = Color.HSVToColor(floatArrayOf((Math.abs(hash[0] * hash[1] + hash[2]) % 360).toFloat(), 0.8f, 1.0f))
private val background = Color.HSVToColor(floatArrayOf((Math.abs(hash[1] * hash[2] + hash[0]) % 360).toFloat(), 0.8f, 1.0f))
private val textPaint = TextPaint().apply {
textAlign = Paint.Align.CENTER
color = 0xFF607D8B.toInt()
typeface = Typeface.create(Typeface.SANS_SERIF, Typeface.BOLD)
}
override fun draw(canvas: Canvas) {
var x: Float
var y: Float
val width = canvas.width.toFloat()
val height = canvas.height.toFloat()
val cellWidth = width / SIZE.toFloat()
val cellHeight = height / SIZE.toFloat()
paint.color = background
canvas.drawCircle(width / 2, height / 2, width / 2, paint)
paint.color = color
for (row in 0 until SIZE) {
for (column in 0 until SIZE) {
if (fields[row][column]) {
x = cellWidth * column
y = cellHeight * row
canvas.drawCircle(
x + cellWidth / 2, y + cellHeight / 2, cellHeight / 2,
paint
)
}
}
}
if (isChan) {
textPaint.textSize = 2 * cellHeight
canvas.drawText("[isChan]", width / 2, 6.7f * cellHeight, textPaint)
}
}
override fun setAlpha(alpha: Int) {
paint.alpha = alpha
}
override fun setColorFilter(cf: ColorFilter?) {
paint.colorFilter = cf
}
override fun getOpacity() = PixelFormat.TRANSPARENT
companion object {
private val SIZE = 9
private val CENTER_COLUMN = 5
}
}