generate method

SvgWidget generate(Array ax, double xStart, double xEnd, double yStart, double yEnd, double distDeltaX, double yMin, double yMax,)

Implementation

SvgWidget generate(Array ax, double xStart, double xEnd, double yStart,
    double yEnd, double distDeltaX, double yMin, double yMax) {
  if (ax.length != ay.length) {
    throw FormatException('expected ax and ay to have same length');
  }

  stroke ??= Color.hex('#ff0000');

  // main widgets list
  var widgets = <SvgWidget>[];

  switch (plotGeneralType) {
    case PlotGeneralType.Line:
      var points = <PointPair>[];

      for (var i = 0; i < ax.length; i++) {
        var xPoint = calcXPoint(xStart, i, distDeltaX);
        var yPoint = scaleConversion(ay[i], yStart, yEnd, yMin, yMax);

        points.add(PointPair(x: xPoint, y: yPoint));
      }

      widgets.add(Polyline(
          points: points,
          stroke: stroke,
          fill: fill,
          strokeWidth: strokeWidth,
          strokeDasharray: strokeDasharray));
      break;
    case PlotGeneralType.Dot:
      for (var i = 0; i < ax.length; i++) {
        var xPoint = calcXPoint(xStart, i, distDeltaX);
        var yPoint = scaleConversion(ay[i], yStart, yEnd, yMin, yMax);

        widgets.add(Circle(
            cx: xPoint,
            cy: yPoint,
            r: strokeWidth?.getValue() ?? 2.0,
            stroke: stroke,
            fill: fill ?? stroke,
            strokeDasharray: strokeDasharray));
      }
      break;
    case PlotGeneralType.Stem:
      var middleY = yStart + ((yEnd - yStart) / 2);

      for (var i = 0; i < ax.length; i++) {
        var xPoint = calcXPoint(xStart, i, distDeltaX);
        var yPoint = scaleConversion(ay[i], yStart, yEnd, yMin, yMax);

        widgets.add(Line(
            x1: xPoint,
            y1: yPoint,
            x2: xPoint,
            y2: middleY,
            strokeWidth: strokeWidth,
            stroke: stroke,
            strokeDasharray: strokeDasharray));
        widgets.add(Circle(
            cx: xPoint,
            cy: yPoint,
            r: strokeWidth?.getValue() ?? 2.0,
            stroke: stroke,
            fill: fill ?? stroke,
            strokeDasharray: strokeDasharray));
      }
      break;
    case PlotGeneralType.Bar:
      var middleY = yStart + ((yEnd - yStart) / 2);
      var width = strokeWidth?.getValue() ?? 2.0;

      for (var i = 0; i < ax.length; i++) {
        var xPoint = calcXPoint(xStart, i, distDeltaX);
        var yPoint = scaleConversion(ay[i], yStart, yEnd, yMin, yMax);
        var height = middleY - yPoint;

        if (height >= 0) {
          widgets.add(Rect(
              x: xPoint,
              y: yPoint,
              width: width,
              height: height,
              stroke: stroke,
              fill: fill ?? stroke,
              strokeDasharray: strokeDasharray));
        } else {
          widgets.add(Rect(
              x: xPoint,
              y: middleY,
              width: width,
              height: height.abs(),
              stroke: stroke,
              fill: fill ?? stroke,
              strokeDasharray: strokeDasharray));
        }
      }
      break;
  }

  return Group(id: id, children: widgets);
}