101 lines
2.9 KiB
Java
101 lines
2.9 KiB
Java
/*
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* Copyright 2015 Christian Basler
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package ch.dissem.apps.abit;
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import android.graphics.*;
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import android.graphics.drawable.Drawable;
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import android.support.annotation.NonNull;
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import ch.dissem.bitmessage.entity.BitmessageAddress;
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/**
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* @author Christian Basler
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*/
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public class Identicon extends Drawable {
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private static final int SIZE = 9;
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private static final int CENTER_COLUMN = 5;
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private final Paint paint;
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private int color;
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private int background;
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private boolean[][] fields;
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public Identicon(BitmessageAddress input) {
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paint = new Paint();
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paint.setStyle(Paint.Style.FILL);
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paint.setAntiAlias(true);
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byte[] hash = input.getRipe();
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fields = new boolean[SIZE][SIZE];
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color = Color.HSVToColor(new float[]{
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Math.abs(hash[0] * hash[1] + hash[2]) % 360,
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0.8f,
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1.0f
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});
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background = Color.HSVToColor(new float[]{
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Math.abs(hash[1] * hash[2] + hash[0]) % 360,
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0.8f,
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1.0f
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});
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for (int row = 0; row < SIZE; row++) {
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for (int column = 0; column < SIZE; column++) {
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fields[row][column] = hash[(row * (column < CENTER_COLUMN ? column : SIZE -
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column - 1)) % hash.length] >= 0;
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}
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}
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}
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@Override
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public void draw(@NonNull Canvas canvas) {
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float x, y;
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float width = canvas.getWidth();
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float height = canvas.getHeight();
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float cellWidth = width / (float) SIZE;
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float cellHeight = height / (float) SIZE;
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paint.setColor(background);
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canvas.drawCircle(width / 2, height / 2, width / 2, paint);
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paint.setColor(color);
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for (int row = 0; row < SIZE; row++) {
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for (int column = 0; column < SIZE; column++) {
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if (fields[row][column]) {
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x = cellWidth * column;
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y = cellHeight * row;
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canvas.drawCircle(x + cellWidth / 2, y + cellHeight / 2, cellHeight / 2, paint);
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}
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}
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}
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}
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@Override
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public void setAlpha(int alpha) {
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paint.setAlpha(alpha);
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}
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@Override
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public void setColorFilter(ColorFilter cf) {
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paint.setColorFilter(cf);
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}
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@Override
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public int getOpacity() {
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return PixelFormat.TRANSPARENT;
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}
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}
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