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package de.danoeh.antennapod.view;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.RectF;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import androidx.annotation.NonNull;
import androidx.appcompat.widget.AppCompatImageView;
import io.reactivex.annotations.Nullable;
public class PieChartView extends AppCompatImageView {
private PieChartDrawable drawable;
public PieChartView(Context context) {
super(context);
setup();
}
public PieChartView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
setup();
}
public PieChartView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
setup();
}
@SuppressLint("ClickableViewAccessibility")
private void setup() {
drawable = new PieChartDrawable();
setImageDrawable(drawable);
}
/**
* Set of data values to display.
*/
public void setData(PieChartData data) {
drawable.data = data;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = getMeasuredWidth();
setMeasuredDimension(width, width / 2);
}
public static class PieChartData {
private static final int[] COLOR_VALUES = new int[]{0xFF3775E6, 0xffe51c23, 0xffff9800, 0xff259b24, 0xff9c27b0,
0xff0099c6, 0xffdd4477, 0xff66aa00, 0xffb82e2e, 0xff316395,
0xff994499, 0xff22aa99, 0xffaaaa11, 0xff6633cc, 0xff0073e6};
private final float valueSum;
private final float[] values;
public PieChartData(float[] values) {
this.values = values;
float valueSum = 0;
for (float datum : values) {
valueSum += datum;
}
this.valueSum = valueSum;
}
public float getSum() {
return valueSum;
}
public float getPercentageOfItem(int index) {
if (valueSum == 0) {
return 0;
}
return values[index] / valueSum;
}
public boolean isLargeEnoughToDisplay(int index) {
return getPercentageOfItem(index) > 0.04;
}
public int getColorOfItem(int index) {
if (!isLargeEnoughToDisplay(index)) {
return Color.GRAY;
}
return COLOR_VALUES[index % COLOR_VALUES.length];
}
}
private static class PieChartDrawable extends Drawable {
private static final float PADDING_DEGREES = 3f;
private PieChartData data;
private final Paint paint;
private PieChartDrawable() {
paint = new Paint();
paint.setFlags(Paint.ANTI_ALIAS_FLAG);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStrokeCap(Paint.Cap.ROUND);
}
@Override
public void draw(@NonNull Canvas canvas) {
final float strokeSize = getBounds().height() / 30f;
paint.setStrokeWidth(strokeSize);
float radius = getBounds().height() - strokeSize;
float center = getBounds().width() / 2.f;
RectF arcBounds = new RectF(center - radius, strokeSize, center + radius, strokeSize + radius * 2);
float startAngle = 180;
for (int i = 0; i < data.values.length; i++) {
if (!data.isLargeEnoughToDisplay(i)) {
break;
}
paint.setColor(data.getColorOfItem(i));
float padding = i == 0 ? PADDING_DEGREES / 2 : PADDING_DEGREES;
float sweepAngle = (180f - PADDING_DEGREES) * data.getPercentageOfItem(i);
canvas.drawArc(arcBounds, startAngle + padding, sweepAngle - padding, false, paint);
startAngle = startAngle + sweepAngle;
}
paint.setColor(Color.GRAY);
float sweepAngle = 360 - startAngle - PADDING_DEGREES / 2;
if (sweepAngle > PADDING_DEGREES) {
canvas.drawArc(arcBounds, startAngle + PADDING_DEGREES, sweepAngle - PADDING_DEGREES, false, paint);
}
}
@Override
public int getOpacity() {
return PixelFormat.TRANSLUCENT;
}
@Override
public void setAlpha(int alpha) {
}
@Override
public void setColorFilter(ColorFilter cf) {
}
}
}
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