paintLines method

void paintLines(Canvas canvas, Size size, ExtendedImageCropLayerPainter painter)

Draw grid lines inside the crop area

Implementation

void paintLines(
  Canvas canvas,
  Size size,
  ExtendedImageCropLayerPainter painter,
) {
  final Color lineColor = painter.lineColor;
  final double lineHeight = painter.lineHeight;
  final Rect cropRect = painter.cropRect;
  final bool pointerDown = painter.pointerDown;
  final Paint linePainter =
      Paint()
        ..color = lineColor
        ..strokeWidth = lineHeight
        ..style = PaintingStyle.stroke;

  // Draw the crop rectangle's border
  canvas.drawRect(cropRect, linePainter);

  // If pointer is down, draw additional grid lines inside the crop area
  if (pointerDown) {
    // Vertical lines
    canvas.drawLine(
      Offset(
        (cropRect.right - cropRect.left) / 3.0 + cropRect.left,
        cropRect.top,
      ),
      Offset(
        (cropRect.right - cropRect.left) / 3.0 + cropRect.left,
        cropRect.bottom,
      ),
      linePainter,
    );

    canvas.drawLine(
      Offset(
        (cropRect.right - cropRect.left) / 3.0 * 2.0 + cropRect.left,
        cropRect.top,
      ),
      Offset(
        (cropRect.right - cropRect.left) / 3.0 * 2.0 + cropRect.left,
        cropRect.bottom,
      ),
      linePainter,
    );

    // Horizontal lines
    canvas.drawLine(
      Offset(
        cropRect.left,
        (cropRect.bottom - cropRect.top) / 3.0 + cropRect.top,
      ),
      Offset(
        cropRect.right,
        (cropRect.bottom - cropRect.top) / 3.0 + cropRect.top,
      ),
      linePainter,
    );

    canvas.drawLine(
      Offset(
        cropRect.left,
        (cropRect.bottom - cropRect.top) / 3.0 * 2.0 + cropRect.top,
      ),
      Offset(
        cropRect.right,
        (cropRect.bottom - cropRect.top) / 3.0 * 2.0 + cropRect.top,
      ),
      linePainter,
    );
  }
}