text with gradient

text_gradient.dart

final colors = [
  Color(0xffff0000), Color(0xffffff00), Color(0xff00ff00),
  Color(0xff00ffff), Color(0xff0000ff), Color(0xffff00ff), Color(0xffff0000),
];
final colorStops = [0 / 6, 1 / 6, 2 / 6, 3 / 6, 4 / 6, 5 / 6, 6 / 6];
final gradient = new ui.Gradient.linear(
  Offset(0.0, 0.0),
  Offset(0.0, size.height),
  colors,
  colorStops,
);
final gradientPaint = new Paint()..shader = gradient;

final paragraphStyle = new ui.ParagraphStyle(
  fontSize: 60.0,
  textAlign: TextAlign.center,
);
final paragraphBuilder = new ui.ParagraphBuilder(paragraphStyle)
  ..pushStyle(new ui.TextStyle(foreground: gradientPaint))
  ..addText('TEST');
final paragraph = paragraphBuilder.build();
paragraph.layout(new ui.ParagraphConstraints(width: size.width / 2));

final offset1 = new Offset(size.width * 0.5, size.height * 0.33);
canvas.drawParagraph(paragraph, offset1);