How to use

onDraw

method

in

com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView

@Override
protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  // Don't draw pin before image is ready so it doesn't move around during setup.
  if (!isReady()) {
    return;
  }
  paint.setAntiAlias(true);
  if (sPin != null && pin != null) {
    sourceToViewCoord(sPin, vPin);
    float vX = vPin.x - (pin.getWidth()/2);
    float vY = vPin.y - pin.getHeight();
    canvas.drawBitmap(pin, vX, vY, paint);
  }
}

@Override
protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  // Don't draw anything before image is ready.
  if (!isReady()) {
    return;
  }
  paint.setAntiAlias(true);
  if (sPoints != null && sPoints.size() >= 2) {
    vPath.reset();
    sourceToViewCoord(sPoints.get(0).x, sPoints.get(0).y, vPrev);
    vPath.moveTo(vPrev.x, vPrev.y);
    for (int i = 1; i < sPoints.size(); i++) {
      sourceToViewCoord(sPoints.get(i).x, sPoints.get(i).y, vPoint);
      vPath.quadTo(vPrev.x, vPrev.y, (vPoint.x + vPrev.x) / 2, (vPoint.y + vPrev.y) / 2);
      vPrev = vPoint;
    }
    paint.setStyle(Style.STROKE);
    paint.setStrokeCap(Cap.ROUND);
    paint.setStrokeWidth(strokeWidth * 2);
    paint.setColor(Color.BLACK);
    canvas.drawPath(vPath, paint);
    paint.setStrokeWidth(strokeWidth);
    paint.setColor(Color.argb(255, 51, 181, 229));
    canvas.drawPath(vPath, paint);
  }
}

@Override
protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  // Don't draw pin before image is ready so it doesn't move around during setup.
  if (!isReady()) {
    return;
  }
  sCenter.set(getSWidth()/2, getSHeight()/2);
  sourceToViewCoord(sCenter, vCenter);
  float radius = (getScale() * getSWidth()) * 0.25f;
  paint.setAntiAlias(true);
  paint.setStyle(Style.STROKE);
  paint.setStrokeCap(Cap.ROUND);
  paint.setStrokeWidth(strokeWidth * 2);
  paint.setColor(Color.BLACK);
  canvas.drawCircle(vCenter.x, vCenter.y, radius, paint);
  paint.setStrokeWidth(strokeWidth);
  paint.setColor(Color.argb(255, 51, 181, 229));
  canvas.drawCircle(vCenter.x, vCenter.y, radius, paint);
}

  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);

    if (!isReady()) {
      return;
    }

    if (dotCenter != null) {
      PointF vPoint = sourceToViewCoord(dotCenter);
      float scaledRadius = getScale() * radius;
      Paint paint = new Paint();
      paint.setAntiAlias(true);
      paint.setStyle(Paint.Style.FILL);
      paint.setColor(getResources().getColor(R.color.ia_blue));
      canvas.drawCircle(vPoint.x, vPoint.y, scaledRadius, paint);
    }
  }
}

@Override
protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  if (!isReady()) {
    Log.w(TAG, "drawing not yet ready, skipping drawing locations");
    return;
  }
  final float scaledRadius = getScale() * mRadius;
  Iterator<LocationEntry> iterator = mKnownLocations.values().iterator();
  while (iterator.hasNext()) {
    LocationEntry entry = iterator.next();
    final float scaledRadiusAccuracy = getScale() * (mRadius + entry.mAccuracy);
    sourceToViewCoord(entry.mPoint, mRecyclePoint);
    mDotPaint.setColor(entry.mSource.color);
    mTextPaint.setColor(entry.mSource.color);
    canvas.drawCircle(mRecyclePoint.x, mRecyclePoint.y, scaledRadius, mDotPaint);
    mDotPaintAccuracy.setColor(entry.mSource.color);
    mDotPaintAccuracy.setAlpha(50);
    canvas.drawCircle(mRecyclePoint.x, mRecyclePoint.y, scaledRadiusAccuracy, mDotPaintAccuracy);
    canvas.drawText(entry.mSource.name,
        mRecyclePoint.x + (scaledRadius * 1.2f),
        mRecyclePoint.y + (scaledRadius / 2),
        mTextPaint);
  }
}

@Override
protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  // Don't draw anything before image is ready.
  if (!isReady() || cropRect == null) {
    return;
  }
  drawBackground(canvas);
  drawRect(canvas);
  drawCorners(canvas);
  if (touching) {
    drawGuidelines(canvas);
  }
}