diff options
Diffstat (limited to 'app/src/main/java/de/danoeh/antennapod/view/PieChartView.java')
-rw-r--r-- | app/src/main/java/de/danoeh/antennapod/view/PieChartView.java | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/app/src/main/java/de/danoeh/antennapod/view/PieChartView.java b/app/src/main/java/de/danoeh/antennapod/view/PieChartView.java new file mode 100644 index 000000000..ada5401d8 --- /dev/null +++ b/app/src/main/java/de/danoeh/antennapod/view/PieChartView.java @@ -0,0 +1,121 @@ +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 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) { + } + } +} |