JuzView.java

package com.quran.labs.androidquran.widgets;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.drawable.Drawable;
import android.support.v4.content.ContextCompat;
import android.text.TextPaint;
import android.text.TextUtils;

import com.quran.labs.androidquran.R;

public class JuzView extends Drawable {
  public static final int TYPE_JUZ = 1;
  public static final int TYPE_QUARTER = 2;
  public static final int TYPE_HALF = 3;
  public static final int TYPE_THREE_QUARTERS = 4;

  private int mRadius;
  private int mCircleY;
  private int mPercentage;
  private float mTextOffset;
  private String mOverlayText;

  private RectF mCircleRect;
  private Paint mCirclePaint;
  private TextPaint mOverlayTextPaint;
  private Paint mCircleBackgroundPaint;

  public JuzView(Context context, int type, String overlayText) {
    final Resources resources = context.getResources();
    final int circleColor = ContextCompat.getColor(context, R.color.accent_color);
    final int circleBackground = ContextCompat.getColor(context, R.color.accent_color_dark);

    mCirclePaint = new Paint();
    mCirclePaint.setStyle(Paint.Style.FILL);
    mCirclePaint.setColor(circleColor);
    mCirclePaint.setAntiAlias(true);

    mCircleBackgroundPaint = new Paint();
    mCircleBackgroundPaint.setStyle(Paint.Style.FILL);
    mCircleBackgroundPaint.setColor(circleBackground);
    mCircleBackgroundPaint.setAntiAlias(true);

    mOverlayText = overlayText;
    if (!TextUtils.isEmpty(mOverlayText)) {
      final int textColor = ContextCompat.getColor(context, R.color.header_background);
      final int textSize =
          resources.getDimensionPixelSize(R.dimen.juz_overlay_text_size);
      mOverlayTextPaint = new TextPaint();
      mOverlayTextPaint.setAntiAlias(true);
      mOverlayTextPaint.setColor(textColor);
      mOverlayTextPaint.setTextSize(textSize);
      mOverlayTextPaint.setTextAlign(Paint.Align.CENTER);

      final float textHeight =
          mOverlayTextPaint.descent() - mOverlayTextPaint.ascent();
      mTextOffset = (textHeight / 2) - mOverlayTextPaint.descent();
    }

    final int percentage;
    switch (type) {
      case TYPE_JUZ:
        percentage = 100;
        break;
      case TYPE_THREE_QUARTERS:
        percentage = 75;
        break;
      case TYPE_HALF:
        percentage = 50;
        break;
      case TYPE_QUARTER:
        percentage = 25;
        break;
      default:
        percentage = 0;
    }
    mPercentage = percentage;
  }

  @Override
  public void setBounds(int left, int top, int right, int bottom) {
    super.setBounds(left, top, right, bottom);
    mRadius = (right - left) / 2;
    final int yOffset = ((bottom - top) - (2 * mRadius)) / 2;
    mCircleY = mRadius + yOffset;
    mCircleRect = new RectF(left, top + yOffset,
        right, top + yOffset + 2 * mRadius);
  }

  @Override
  public void draw(Canvas canvas) {
    canvas.drawCircle(mRadius, mCircleY, mRadius, mCircleBackgroundPaint);
    canvas.drawArc(mCircleRect, -90,
        (int) (3.6 * mPercentage), true, mCirclePaint);
    if (mOverlayTextPaint != null) {
      canvas.drawText(mOverlayText, mCircleRect.centerX(),
          mCircleRect.centerY() + mTextOffset, mOverlayTextPaint);
    }
  }

  @Override
  public void setAlpha(int alpha) {
  }

  @Override
  public void setColorFilter(ColorFilter cf) {
  }

  @Override
  public int getOpacity() {
    return 0;
  }
}