paintBorder method

void paintBorder({ required Border border, required Canvas canvas, required Offset a, required Offset b, required Offset c, required Offset d, required double tanTheta, required double sinTheta, })

Paint the border of the NeoPopTiltedButton

The border is painted as a polygon with the following points: a, b, c, d. Theta is the angle of the tilt of the button.

Implementation

void paintBorder({
  required Border border,
  required Canvas canvas,
  required Offset a,
  required Offset b,
  required Offset c,
  required Offset d,
  required double tanTheta,
  required double sinTheta,
}) {
  final Path borderPath = Path();
  final Paint borderPaint = Paint()..strokeWidth = 0.0;

  switch (border.top.style) {
    case BorderStyle.solid:
      borderPaint.color = border.top.color;
      borderPath.reset();
      borderPath.moveTo(a.dx, a.dy);
      borderPath.lineTo(b.dx, b.dy);

      final borderWidth = border.top.width;
      if (borderWidth == 0) {
        borderPaint.style = PaintingStyle.stroke;
      } else {
        borderPaint.style = PaintingStyle.fill;
        borderPath.lineTo(
            b.dx - (borderWidth / tanTheta), b.dy + borderWidth);
        borderPath.lineTo(
            a.dx + (borderWidth / tanTheta), a.dy + borderWidth);
      }

      canvas.drawPath(borderPath, borderPaint);
      break;
    default:
      break;
  }

  switch (border.right.style) {
    case BorderStyle.solid:
      borderPaint.color = border.right.color;
      borderPath.reset();
      borderPath.moveTo(b.dx, b.dy);
      borderPath.lineTo(c.dx, c.dy);

      final borderWidth = border.right.width;
      if (borderWidth == 0) {
        borderPaint.style = PaintingStyle.stroke;
      } else {
        borderPaint.style = PaintingStyle.fill;
        borderPath.lineTo(c.dx - (borderWidth / sinTheta), c.dy);
        borderPath.lineTo(b.dx - (borderWidth / sinTheta), b.dy);
      }

      canvas.drawPath(borderPath, borderPaint);
      break;
    default:
      break;
  }

  switch (border.bottom.style) {
    case BorderStyle.solid:
      borderPaint.color = border.bottom.color;
      borderPath.reset();
      borderPath.moveTo(c.dx, c.dy);
      borderPath.lineTo(d.dx, d.dy);

      final borderWidth = border.bottom.width;
      if (borderWidth == 0) {
        borderPaint.style = PaintingStyle.stroke;
      } else {
        borderPaint.style = PaintingStyle.fill;
        borderPath.lineTo(
            d.dx + (borderWidth / tanTheta), d.dy - borderWidth);
        borderPath.lineTo(
            c.dx - (borderWidth / tanTheta), c.dy - borderWidth);
      }

      canvas.drawPath(borderPath, borderPaint);
      break;
    default:
      break;
  }

  switch (border.left.style) {
    case BorderStyle.solid:
      borderPaint.color = border.left.color;
      borderPath.reset();
      borderPath.moveTo(d.dx, d.dy);
      borderPath.lineTo(a.dx, a.dy);

      final borderWidth = border.left.width;
      if (borderWidth == 0) {
        borderPaint.style = PaintingStyle.stroke;
      } else {
        borderPaint.style = PaintingStyle.fill;
        borderPath.lineTo(a.dx + (borderWidth / sinTheta), a.dy);
        borderPath.lineTo(d.dx + (borderWidth / sinTheta), d.dy);
      }

      canvas.drawPath(borderPath, borderPaint);
      break;
    default:
      break;
  }
}