decodeRenderSpec<D> static method

RenderSpec<D>? decodeRenderSpec<D>(dynamic map, { bool validate = false, })

Decodes the object from a Map-like dynamic structure. This expects the JSON format to be one of the following structures:

{
  "axisLineStyle": <LineStyleSpec>,
  "type": "none"
}

{
  "axisLineStyle": <LineStyleSpec>,
  "labelAnchor": <TickLabelAnchor>,
  "labelCollisionOffsetFromAxisPx": <int>,
  "labelCollisionOffsetFromTickPx": <int>,
  "labelCollisionRotation": <int>,
  "labelJustification": <TickLabelJustification>,
  "labelOffsetFromAxisPx": <int>,
  "labelOffsetFromTickPx": <int>,
  "labelRotation": <int>,
  "labelStyle": <TextStyleSpec>,
  "lineStyle": <LineStyleSpec>,
  "minimumPaddingBetweenLabelsPx": <int>,
  "tickLengthPx": <int>,
  "type": <"grid_line" | "small_tick">
}

See also

• decodeLineStyleSpec
• decodeTickLabelAnchor
• decodeTickLabelJustification
• decodeTextStyleSpec

Implementation

static charts.RenderSpec<D>? decodeRenderSpec<D>(
  dynamic map, {
  bool validate = false,
}) {
  charts.RenderSpec<D>? result;

  if (map is charts.RenderSpec<D>) {
    result = map;
  } else if (map != null) {
    assert(SchemaValidator.validate(
      schemaId: '$_baseSchemaUrl/render_spec',
      value: map,
      validate: validate,
    ));
    final type = map['type'];
    switch (type) {
      case 'gridline':
        result = charts.GridlineRendererSpec<D>(
          axisLineStyle: decodeLineStyleSpec(
            map['axisLineStyle'],
            validate: false,
          ),
          labelAnchor: decodeTickLabelAnchor(
            map['labelAnchor'],
            validate: false,
          ),
          labelCollisionOffsetFromAxisPx: JsonClass.parseInt(
            map['labelCollisionOffsetFromAxisPx'],
          ),
          labelCollisionOffsetFromTickPx: JsonClass.parseInt(
            map['labelCollisionOffsetFromTickPx'],
          ),
          labelCollisionRotation: JsonClass.parseInt(
            map['labelCollisionRotation'],
          ),
          labelJustification: decodeTickLabelJustification(
            map['labelJustification'],
            validate: false,
          ),
          labelOffsetFromAxisPx: JsonClass.parseInt(
            map['labelOffsetFromAxisPx'],
          ),
          labelOffsetFromTickPx: JsonClass.parseInt(
            map['labelOffsetFromTickPx'],
          ),
          labelRotation: JsonClass.parseInt(map['labelRotation']),
          labelStyle: decodeTextStyleSpec(
            map['labelStyle'],
            validate: false,
          ),
          lineStyle: decodeLineStyleSpec(
            map['lineStyle'],
            validate: false,
          ),
          minimumPaddingBetweenLabelsPx: JsonClass.parseInt(
            map['minimumPaddingBetweenLabelsPx'],
          ),
          tickLengthPx: JsonClass.parseInt(map['tickLengthPx']),
        );
        break;

      case 'none':
        result = charts.NoneRenderSpec<D>(
          axisLineStyle: decodeLineStyleSpec(
            map['axisLineStyle'],
            validate: false,
          ),
        );
        break;

      case 'small_tick':
        result = charts.SmallTickRendererSpec<D>(
          axisLineStyle: decodeLineStyleSpec(
            map['axisLineStyle'],
            validate: false,
          ),
          labelAnchor: decodeTickLabelAnchor(
            map['labelAnchor'],
            validate: false,
          ),
          labelCollisionOffsetFromAxisPx: JsonClass.parseInt(
            map['labelCollisionOffsetFromAxisPx'],
          ),
          labelCollisionOffsetFromTickPx: JsonClass.parseInt(
            map['labelCollisionOffsetFromTickPx'],
          ),
          labelCollisionRotation: JsonClass.parseInt(
            map['labelCollisionRotation'],
          ),
          labelJustification: decodeTickLabelJustification(
            map['labelJustification'],
            validate: false,
          ),
          labelOffsetFromAxisPx: JsonClass.parseInt(
            map['labelOffsetFromAxisPx'],
          ),
          labelOffsetFromTickPx: JsonClass.parseInt(
            map['labelOffsetFromTickPx'],
          ),
          labelRotation: JsonClass.parseInt(map['labelRotation']),
          labelStyle: decodeTextStyleSpec(
            map['labelStyle'],
            validate: false,
          ),
          lineStyle: decodeLineStyleSpec(
            map['lineStyle'],
            validate: false,
          ),
          minimumPaddingBetweenLabelsPx: JsonClass.parseInt(
            map['minimumPaddingBetweenLabelsPx'],
          ),
          tickLengthPx: JsonClass.parseInt(map['tickLengthPx']),
        );
        break;

      default:
        throw Exception('[decodeRenderSpec]: unknown type: [$type]');
    }
  }

  return result;
}