convert method

@override LineStyle convert(double animatorPercent)

该方法由子类复写且只能在getValue内部调用

Implementation

@override
LineStyle convert(double animatorPercent) {
  List<double> dash;
  if (begin.dash.length == end.dash.length && begin.dash.isNotEmpty) {
    dash = [];
    for (int i = 0; i < begin.dash.length; i++) {
      dash.add(ui.lerpDouble(begin.dash[i], end.dash[i], animatorPercent)!);
    }
  } else {
    dash = animatorPercent < 0.5 ? begin.dash : end.dash;
  }

  BoxShadow? shadow;
  if (_shadowTween != null) {
    shadow = _shadowTween!.value;
  } else {
    shadow = animatorPercent < 0.5 ? begin.shadow : end.shadow;
  }

  sd.Shader? shader;
  if (_shaderTween != null) {
    shader = _shaderTween!.convert(animatorPercent);
  } else {
    shader = animatorPercent < 0.5 ? begin.shader : end.shader;
  }

  return LineStyle(
    color: Color.lerp(begin.color, end.color, animatorPercent)!,
    width: ui.lerpDouble(begin.width, end.width, animatorPercent)!,
    cap: begin.cap == StrokeCap.butt ? end.cap : begin.cap,
    join: begin.join == StrokeJoin.miter ? end.join : begin.join,
    dash: dash,
    shadow: shadow,
    shader: shader,
    smooth: animatorPercent < 0.5 ? begin.smooth : end.smooth,
  );
}