98 lines
3.0 KiB
Java
98 lines
3.0 KiB
Java
/*
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* Copyright (C) 2010 Daniel Nilsson
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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 org.mariotaku.twidere.graphic;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.ColorFilter;
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import android.graphics.Paint;
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import android.graphics.PixelFormat;
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import android.graphics.Rect;
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import android.graphics.drawable.Drawable;
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import android.support.annotation.NonNull;
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/**
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* This drawable that draws a simple white and gray chessboard pattern. It's
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* pattern you will often see as a background behind a partly transparent image
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* in many applications.
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*
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* @author Daniel Nilsson
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*/
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public class AlphaPatternDrawable extends Drawable {
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private final int mAlphaPatternSize;
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private int mNumRectanglesHorizontal;
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private int mNumRectanglesVertical;
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private final Rect mRect = new Rect(), mBounds = new Rect();
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private final Paint mPaint = new Paint();
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public AlphaPatternDrawable(final int alphaPatternSize) {
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mAlphaPatternSize = alphaPatternSize;
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}
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@Override
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public void draw(@NonNull final Canvas canvas) {
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boolean verticalStartWhite = true;
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for (int i = 0; i <= mNumRectanglesVertical; i++) {
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boolean horizontalStartWhite = verticalStartWhite;
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for (int j = 0; j <= mNumRectanglesHorizontal; j++) {
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mRect.setEmpty();
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mRect.top = i * mAlphaPatternSize + mBounds.top;
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mRect.left = j * mAlphaPatternSize + mBounds.left;
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mRect.bottom = Math.min(mRect.top + mAlphaPatternSize, mBounds.bottom);
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mRect.right = Math.min(mRect.left + mAlphaPatternSize, mBounds.right);
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mPaint.setColor(horizontalStartWhite ? Color.WHITE : Color.LTGRAY);
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canvas.drawRect(mRect, mPaint);
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horizontalStartWhite = !horizontalStartWhite;
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}
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verticalStartWhite = !verticalStartWhite;
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}
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}
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@Override
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public int getOpacity() {
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return PixelFormat.OPAQUE;
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}
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@Override
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public void setAlpha(final int alpha) {
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}
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@Override
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public void setColorFilter(final ColorFilter cf) {
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}
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@Override
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protected void onBoundsChange(final Rect bounds) {
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super.onBoundsChange(bounds);
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mBounds.set(bounds);
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final int height = bounds.height();
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final int width = bounds.width();
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mNumRectanglesHorizontal = (int) Math.ceil(width / mAlphaPatternSize);
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mNumRectanglesVertical = (int) Math.ceil(height / mAlphaPatternSize);
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invalidateSelf();
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}
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}
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