text method

void text(String text, double x, double y)

Paint the given text at the given (x,y), using the current horizontal and vertical text alignment and text size.

Implementation

void text(String text, double x, double y) {
  final paragraphBuilder = ParagraphBuilder(ParagraphStyle(
    fontFamily: _fontName,
    fontSize: _fontSize,
    textAlign: _textAlignHorizontal.toFlutterAlign(),
  ))
    ..pushStyle(TextStyle(
      color: _paintingContext.fillPaint.color,
      height: _textLeading != null ? _textLeading! / _fontSize : null,
    ))
    ..addText(text);
  final paragraph = paragraphBuilder.build()
    ..layout(
      ParagraphConstraints(width: double.infinity),
    );

  late double textX;
  late double textY;
  switch (_textAlignHorizontal) {
    case TextAlignHorizontal.left:
      textX = x;
      break;
    case TextAlignHorizontal.center:
      textX = x - (paragraph.maxIntrinsicWidth / 2);
      break;
    case TextAlignHorizontal.right:
      textX = x - paragraph.maxIntrinsicWidth;
      break;
  }

  switch (_textAlignVertical) {
    case TextAlignVertical.top:
      // We adjust the top alignment to deal with leading. Flutter applies extra
      // leading to the first line of text, but Processing wants the top of the
      // first line to sit exactly on the given `y` value. We do our best to
      // correct for that, here.
      final firstCharacterHeight = paragraph.getBoxesForRange(0, 1).first.toRect().height;
      final leadingAdjustment = _textLeading != null ? (_textLeading! - firstCharacterHeight) : 0;

      textY = y - leadingAdjustment;
      break;
    case TextAlignVertical.center:
      textY = y - (paragraph.height / 2);
      break;
    case TextAlignVertical.baseline:
      textY = y - paragraph.alphabeticBaseline;
      break;
    case TextAlignVertical.bottom:
      textY = y - paragraph.height;
      break;
  }

  _paintingContext.canvas.drawParagraph(paragraph, Offset(textX, textY));
}