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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.support.annotation.NonNull;
import android.support.v7.widget.AppCompatImageView;
import android.util.AttributeSet;
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 array od names, array of values and array of colors.
*/
public void setData(float[] dataValues) {
drawable.dataValues = dataValues;
drawable.valueSum = 0;
for (float datum : dataValues) {
drawable.valueSum += datum;
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = getMeasuredWidth();
setMeasuredDimension(width, width / 2);
}
private static class PieChartDrawable extends Drawable {
private static final float MIN_DEGREES = 10f;
private static final float PADDING_DEGREES = 3f;
private static final float STROKE_SIZE = 15f;
private static final int[] COLOR_VALUES = new int[]{0xFF3775E6, 0xffe51c23, 0xffff9800, 0xff259b24, 0xff9c27b0,
0xff0099c6, 0xffdd4477, 0xff66aa00, 0xffb82e2e, 0xff316395,
0xff994499, 0xff22aa99, 0xffaaaa11, 0xff6633cc, 0xff0073e6};
private float[] dataValues;
private float valueSum;
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);
paint.setStrokeWidth(STROKE_SIZE);
}
@Override
public void draw(@NonNull Canvas canvas) {
if (valueSum == 0) {
return;
}
float radius = getBounds().height() - STROKE_SIZE;
float center = getBounds().width() / 2.f;
RectF arcBounds = new RectF(center - radius, STROKE_SIZE, center + radius, STROKE_SIZE + radius * 2);
float startAngle = 180;
for (int i = 0; i < dataValues.length; i++) {
float datum = dataValues[i];
float sweepAngle = 180 * datum / valueSum;
if (sweepAngle < MIN_DEGREES) {
break;
}
paint.setColor(COLOR_VALUES[i % COLOR_VALUES.length]);
float padding = i == 0 ? PADDING_DEGREES / 2 : PADDING_DEGREES;
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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