buildPath method

Path buildPath(Offset offset, double width, double height)

Implementation

Path buildPath(Offset offset, double width, double height) {
  var angleRad = pi / 180 * decoration.bubbleMeta.angle;
  double spineHeight = decoration.bubbleMeta.spineHeight;
  var spineMoveX = spineHeight * tan(angleRad / 2);

  double xb = (width - decoration.boxSize.width) / 2 +
      decoration.boxSize.width / 2 -
      spineMoveX;

  double xbs = decoration.boxSize.width / 2;
  double xbe = width - decoration.boxSize.width / 2 - spineMoveX;

  Offset translation = switch (decoration.placement) {
    Placement.top => Offset(xb, 0),
    Placement.topStart => Offset(xbs, 0),
    Placement.topEnd => Offset(xbe, 0),
    Placement.bottom => Offset(xb, 0),
    Placement.bottomStart => Offset(xbs, 0),
    Placement.bottomEnd => Offset(xbe, 0),
    Placement.left => Offset(
        0,
        (height - decoration.boxSize.height) / 2 +
            decoration.boxSize.height / 2 -
            spineMoveX),
    Placement.leftStart =>
      Offset(0, decoration.boxSize.height / 2 - spineMoveX),
    Placement.leftEnd =>
      Offset(0, height - decoration.boxSize.height / 2 - spineMoveX),
    Placement.right => Offset(
        0,
        (height - decoration.boxSize.height) / 2 +
            decoration.boxSize.height / 2 -
            spineMoveX),
    Placement.rightStart =>
      Offset(0, decoration.boxSize.height / 2 - spineMoveX),
    Placement.rightEnd =>
      Offset(0, height - decoration.boxSize.height / 2 - spineMoveX),
  };

  var spineMoveY = spineHeight;
  if (spineHeight != 0) {
    if (decoration.placement == Placement.bottom ||
        decoration.placement == Placement.bottomStart ||
        decoration.placement == Placement.bottomEnd) {
      return Path()
        ..moveTo(offset.dx + translation.dx, offset.dy + translation.dy)
        ..relativeLineTo(spineMoveX, -spineMoveY)
        ..relativeLineTo(spineMoveX, spineMoveY);
    }
    if (decoration.placement == Placement.top ||
        decoration.placement == Placement.topStart ||
        decoration.placement == Placement.topEnd) {
      return Path()
        ..moveTo(
            offset.dx + translation.dx, offset.dy + translation.dy + height)
        ..relativeLineTo(spineMoveX, spineMoveY)
        ..relativeLineTo(spineMoveX, -spineMoveY);
    }
    if (decoration.placement == Placement.rightStart ||
        decoration.placement == Placement.right ||
        decoration.placement == Placement.rightEnd) {
      return Path()
        ..moveTo(offset.dx + translation.dx, offset.dy + translation.dy)
        ..relativeLineTo(-spineMoveY, spineMoveX)
        ..relativeLineTo(spineMoveY, spineMoveX);
    }
    if (decoration.placement == Placement.leftStart ||
        decoration.placement == Placement.left ||
        decoration.placement == Placement.leftEnd) {
      return Path()
        ..moveTo(
            offset.dx + translation.dx + width, offset.dy + translation.dy)
        ..relativeLineTo(spineMoveY, spineMoveX)
        ..relativeLineTo(-spineMoveY, spineMoveX);
    }
  }
  return Path();
}