CircularBorderedImageView.java

/**
 * Copyright (C) 2013 - 2015 the enviroCar community
 *
 * This file is part of the enviroCar app.
 *
 * The enviroCar app is free software: you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * The enviroCar app is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with the enviroCar app. If not, see http://www.gnu.org/licenses/.
 */
package org.envirocar.app.view.utils;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

import org.envirocar.app.R;

/**
 * @author dewall
 */
public class CircularBorderedImageView extends ImageView {

    private Rect mBorderRect;
    private Rect mDrawableRect;

    private Paint mBitmapPaint;
    private Paint mBackgroundPaint;
    private Paint mBorderPaint;

    private int mBorderWidth = 20;
    private float mBorderRadius;
    private float mDrawableRadius;

    protected Bitmap mBitmap;
    private BitmapShader mBitmapShader;
    private final Matrix mShaderMatrix = new Matrix();

    /**
     * @param context
     */
    public CircularBorderedImageView(Context context) {
        super(context);
        init();
    }

    /**
     * @param context
     * @param attrs
     */
    public CircularBorderedImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    /**
     * @param context
     * @param attrs
     * @param defStyle
     */
    public CircularBorderedImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        Drawable drawable = getDrawable();
        if (drawable == null) {
            return;
        }

        canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius, mBackgroundPaint);
        canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius, mBitmapPaint);
        canvas.drawCircle(getWidth() / 2, getHeight() / 2, mBorderRadius, mBorderPaint);

        //super.onDraw(canvas);
    }

    @Override
    public void setImageBitmap(Bitmap bm) {
        super.setImageBitmap(bm);
        mBitmap = bm;
        init();
    }

    @Override
    public void setImageDrawable(Drawable drawable) {
        super.setImageDrawable(drawable);
        if (drawable == null)
            return;

        if (drawable instanceof BitmapDrawable) {
            mBitmap = ((BitmapDrawable) drawable).getBitmap();
            return;
        }

        Bitmap bitmap;

        if (drawable instanceof ColorDrawable) {
            bitmap = Bitmap.createBitmap(2, 2, Bitmap.Config.ARGB_8888);
        } else {
            bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
                    drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
        }

        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        drawable.draw(canvas);
        mBitmap = bitmap;
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        init();
    }

    @Override
    public ScaleType getScaleType() {
        return ScaleType.CENTER_CROP;
    }

    private void init() {
        super.setScaleType(ScaleType.CENTER_CROP);
        if (mBitmap == null) {
            return;
        }

        mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);

        mBitmapPaint = new Paint();
        mBitmapPaint.setShader(mBitmapShader);
        mBitmapPaint.setAntiAlias(true);

        mBackgroundPaint = new Paint();
        mBackgroundPaint.setColor(getResources().getColor(R.color.blue_dark_cario));
        mBackgroundPaint.setAntiAlias(true);
        mBackgroundPaint.setStyle(Paint.Style.FILL);

        mBorderPaint = new Paint();
        mBorderPaint.setColor(getResources().getColor(R.color.blue_dark_cario));
        mBorderPaint.setStyle(Paint.Style.STROKE);
        mBorderPaint.setAntiAlias(true);

        mBorderRect = new Rect();
        mBorderRect.set(0, 0, getWidth(), getHeight());

        mDrawableRect = new Rect();
        mDrawableRect.set(0, 0, getWidth(), getHeight());
        mDrawableRect.inset(mBorderWidth, mBorderWidth);

        mDrawableRadius = Math.min(mDrawableRect.height() / 2, mDrawableRect.width() / 2);

        updateShaderMatrix();
        invalidate();
    }

    private void updateShaderMatrix() {
        float scale;
        float dx = 0;
        float dy = 0;

        mShaderMatrix.set(null);

        int mBitmapWidth = mBitmap.getWidth();
        int mBitmapHeight = mBitmap.getHeight();

        if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width() * mBitmapHeight) {
            scale = mDrawableRect.height() / (float) mBitmapHeight;
            dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f;
        } else {
            scale = mDrawableRect.width() / (float) mBitmapWidth;
            dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f;
        }

        mShaderMatrix.setScale(scale, scale);
        mShaderMatrix.postTranslate((int) (dx + 0.5f) + mDrawableRect.left, (int) (dy + 0.5f) + mDrawableRect.top);

        mBitmapShader.setLocalMatrix(mShaderMatrix);
    }
}