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package de.danoeh.antennapod.view;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.Nullable;
import de.danoeh.antennapod.R;
public class PlaybackSpeedIndicatorView extends View {
private static final float DEG_2_RAD = (float) (Math.PI / 180);
private static final float PADDING_ANGLE = 30;
private static final float VALUE_UNSET = -4242;
private final Paint arcPaint = new Paint();
private final Paint indicatorPaint = new Paint();
private final Path trianglePath = new Path();
private float angle = VALUE_UNSET;
private float targetAngle = VALUE_UNSET;
private float degreePerFrame = 2;
private float paddingArc = 20;
private float paddingIndicator = 10;
private RectF arcBounds = new RectF();
public PlaybackSpeedIndicatorView(Context context) {
super(context);
setup();
}
public PlaybackSpeedIndicatorView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
setup();
}
public PlaybackSpeedIndicatorView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
setup();
}
private void setup() {
setSpeed(1.0f); // Set default angle to 1.0
targetAngle = VALUE_UNSET; // Do not move to first value that is set externally
int[] colorAttrs = new int[] {R.attr.action_icon_color };
TypedArray a = getContext().obtainStyledAttributes(colorAttrs);
arcPaint.setColor(a.getColor(0, 0xffffffff));
indicatorPaint.setColor(a.getColor(0, 0xffffffff));
a.recycle();
arcPaint.setAntiAlias(true);
arcPaint.setStyle(Paint.Style.STROKE);
arcPaint.setStrokeCap(Paint.Cap.ROUND);
indicatorPaint.setAntiAlias(true);
indicatorPaint.setStyle(Paint.Style.FILL);
trianglePath.setFillType(Path.FillType.EVEN_ODD);
}
public void setSpeed(float value) {
float maxAnglePerDirection = 90 + 45 - 2 * paddingArc;
// Speed values above 3 are probably not too common. Cap at 3 for better differentiation
float normalizedValue = Math.min(2.5f, value - 0.5f) / 2.5f; // Linear between 0 and 1
float target = -maxAnglePerDirection + 2 * maxAnglePerDirection * normalizedValue;
if (targetAngle == VALUE_UNSET) {
angle = target;
}
targetAngle = target;
degreePerFrame = Math.abs(targetAngle - angle) / 20;
invalidate();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
paddingArc = getMeasuredHeight() / 4.5f;
paddingIndicator = getMeasuredHeight() / 6f;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
float radiusInnerCircle = getWidth() / 10f;
canvas.drawCircle(getWidth() / 2f, getHeight() / 2f, radiusInnerCircle, indicatorPaint);
trianglePath.rewind();
float bigRadius = getHeight() / 2f - paddingIndicator;
trianglePath.moveTo(getWidth() / 2f + (float) (bigRadius * Math.sin((-angle + 180) * DEG_2_RAD)),
getHeight() / 2f + (float) (bigRadius * Math.cos((-angle + 180) * DEG_2_RAD)));
trianglePath.lineTo(getWidth() / 2f + (float) (radiusInnerCircle * Math.sin((-angle + 180 - 90) * DEG_2_RAD)),
getHeight() / 2f + (float) (radiusInnerCircle * Math.cos((-angle + 180 - 90) * DEG_2_RAD)));
trianglePath.lineTo(getWidth() / 2f + (float) (radiusInnerCircle * Math.sin((-angle + 180 + 90) * DEG_2_RAD)),
getHeight() / 2f + (float) (radiusInnerCircle * Math.cos((-angle + 180 + 90) * DEG_2_RAD)));
trianglePath.close();
canvas.drawPath(trianglePath, indicatorPaint);
arcPaint.setStrokeWidth(getHeight() / 15f);
arcBounds.set(paddingArc, paddingArc, getWidth() - paddingArc, getHeight() - paddingArc);
canvas.drawArc(arcBounds, -180 - 45, 90 + 45 + angle - PADDING_ANGLE, false, arcPaint);
canvas.drawArc(arcBounds, -90 + PADDING_ANGLE + angle, 90 + 45 - PADDING_ANGLE - angle, false, arcPaint);
if (Math.abs(angle - targetAngle) > 0.5 && targetAngle != VALUE_UNSET) {
angle += Math.signum(targetAngle - angle) * Math.min(degreePerFrame, Math.abs(targetAngle - angle));
invalidate();
}
}
}
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