paintArm method

Implementation

void paintArm(Canvas canvas, Size size, ArmCoordinates coordinates, {double opacity = 1}) {
  final points = [
    coordinates.shoulder,
    coordinates.elbow,
    coordinates.wrist,
    coordinates.fingers,
  ];

  final lineColors = [
    Colors.red,
    Colors.green,
    Colors.blue,
  ];

  final firstCirclePaint = Paint()
    ..color = lineColors[0].withOpacity(opacity)
    ..style = PaintingStyle.fill;

  canvas.drawCircle(points[0], screen / 40, firstCirclePaint);

  // Draw lines based off joint position
  for (var i = 0; i < points.length - 1; i++) {
    final paint = Paint()
      ..color = lineColors[i].withOpacity(opacity)
      ..strokeWidth = screen / 50;
    canvas.drawLine(points[i], points[i + 1], paint);
  }

  // Draw circles on each joint
  for (var i = 0; i < points.length - 1; i++) {
    final circlePaint = Paint()
      ..color = lineColors[i].withOpacity(opacity)
      ..style = PaintingStyle.fill;
    canvas.drawCircle(points[i + 1], screen / 50, circlePaint);
  }
}