main_line_chart function

LineChart main_line_chart({ required TimeFrame current_timeframe, required double max_y, required List<Map<String, dynamic>> sum_of_payments, required Color text_color, required Color icon_color, })

Implementation

LineChart main_line_chart({
  required TimeFrame current_timeframe,
  required double max_y,
  required List<Map<String, dynamic>> sum_of_payments,
  required Color text_color,
  required Color icon_color,
}) {
  sum_of_payments.sort((a, b) => a["date"].compareTo(b["date"]));

  double max_x = sum_of_payments.length > 0
      ? get_max_x(
          timeframe: current_timeframe,
          first_year: (sum_of_payments.first["date"] as DateTime).year,
        )
      : 0;

  List<String> original_bottom_labels = get_bottom_labels(
    max_x: current_timeframe != TimeFrame.Beginning ? max_x + 1 : max_x,
    timeframe: current_timeframe,
  );

  int original_bottom_labels_length = original_bottom_labels.length;
  int original_bottom_labels_length_quarter =
      (original_bottom_labels_length / 4).round();

  List<String> current_bottom_labels = [];

  for (var i = 0; i < original_bottom_labels_length; i++) {
    if (i == original_bottom_labels_length_quarter * 0 ||
        i == original_bottom_labels_length_quarter * 1 ||
        i == original_bottom_labels_length_quarter * 2 ||
        i == original_bottom_labels_length_quarter * 3) {
      current_bottom_labels.add(original_bottom_labels[i]);
    } else {
      current_bottom_labels.add("");
    }
  }

  List<FlSpot> spots = [];

  for (var sum_of_payment in sum_of_payments) {
    DateTime current_date = sum_of_payment["date"] as DateTime;

    Duration date_diference = DateTime.now().difference(current_date);

    double date_diference_result = 0;
    switch (current_timeframe) {
      case TimeFrame.Day:
        date_diference_result = date_diference.inHours.toDouble();
        break;

      case TimeFrame.Week:
        date_diference_result = date_diference.inDays.toDouble();
        break;

      case TimeFrame.Month:
        date_diference_result = date_diference.inDays.toDouble();
        break;

      case TimeFrame.Year:
        date_diference_result = date_diference.inDays.toDouble() / 30;
        break;

      case TimeFrame.Beginning:
        date_diference_result = date_diference.inDays.toDouble() / 365;
        break;
    }

    double result = max_x - date_diference_result;

    spots.add(
      FlSpot(
        result,
        sum_of_payment["amount"].toDouble(),
      ),
    );
  }

  if (spots.length == 1) {
    spots.add(
      FlSpot(
        spots.last.x,
        spots.last.y + 0.5,
      ),
    );
  } else if (spots.isEmpty) {
    max_y = 50;
    spots.add(
      FlSpot(
        max_x,
        0,
      ),
    );
  }

  for (var i = 0; i < spots.length; i++) {
    if (spots[i].x < 0) {
      spots[i] = FlSpot(
        0,
        spots[i].y,
      );
    }
  }

  return LineChart(
    LineChartData(
      lineTouchData: LineTouchData(
        touchTooltipData: LineTouchTooltipData(
          tooltipBgColor: icon_color.withOpacity(0.5),
        ),
        touchCallback: (touch_event, touch_response) {},
        handleBuiltInTouches: true,
      ),
      gridData: FlGridData(
        show: true,
      ),
      titlesData: FlTitlesData(
        topTitles: SideTitles(
          reservedSize: 0,
          showTitles: false,
        ),
        rightTitles: SideTitles(
          reservedSize: 0,
          showTitles: false,
        ),
        bottomTitles: SideTitles(
          showTitles: true,
          reservedSize: 0,
          getTextStyles: (context, value) => TextStyle(
            color: text_color,
            fontWeight: FontWeight.bold,
            fontSize: 14,
          ),
          margin: 10,
          getTitles: (value) {
            if (value <= current_bottom_labels.length - 1) {
              return current_bottom_labels[value.toInt()];
            } else {
              return "";
            }
          },
        ),
        leftTitles: SideTitles(
          showTitles: true,
          getTextStyles: (context, value) => TextStyle(
            color: icon_color,
            fontWeight: FontWeight.bold,
            fontSize: 13,
          ),
          getTitles: (value) {
            String label = "";

            if (value > 999) {
              label = "\$${(value / 1000).round()}k";
            } else {
              label = "\$${value.toInt()}";
            }

            if (max_y < 201) {
              if (value == 0 ||
                  value == 50 ||
                  value == 100 ||
                  value == 150 ||
                  value == 200) {
                return label;
              } else {
                return "";
              }
            } else if (max_y > 200 && max_y < 1001) {
              if (value == 0 ||
                  value == 200 ||
                  value == 400 ||
                  value == 600 ||
                  value == 800 ||
                  value == 1000) {
                return label;
              } else {
                return "";
              }
            } else if (max_y > 1000 && max_y < 2001) {
              if (value == 0 ||
                  value == 500 ||
                  value == 1000 ||
                  value == 1500 ||
                  value == 2000) {
                return label;
              } else {
                return "";
              }
            } else {
              if (value == 0 ||
                  value == 1000 ||
                  value == 2000 ||
                  value == 3000 ||
                  value == 4000 ||
                  value == 5000 ||
                  value == 6000 ||
                  value == 7000 ||
                  value == 8000 ||
                  value == 9000 ||
                  value == 10000) {
                return label;
              } else {
                return "";
              }
            }
          },
          margin: 10,
          reservedSize: 40,
        ),
      ),
      borderData: FlBorderData(
        show: true,
        border: Border(
          bottom: BorderSide(
            color: text_color,
            width: 4,
          ),
          left: BorderSide(
            color: Colors.transparent,
          ),
          right: BorderSide(
            color: Colors.transparent,
          ),
          top: BorderSide(
            color: Colors.transparent,
          ),
        ),
      ),
      minX: 0,
      maxX: max_x,
      minY: 0,
      maxY: max_y,
      lineBarsData: [
        LineChartBarData(
          spots: spots,
          isCurved: true,
          curveSmoothness: 0.15,
          colors: [
            text_color.withOpacity(0.7),
          ],
          barWidth: 6,
          isStrokeCapRound: true,
          dotData: FlDotData(
            show: true,
          ),
          belowBarData: BarAreaData(
            show: true,
            colors: [
              icon_color.withOpacity(0.3),
              text_color.withOpacity(0.3),
            ],
            gradientFrom: Offset(0, 0),
            gradientTo: Offset(0, 1),
            gradientColorStops: [
              0.2,
              1.0,
            ],
            spotsLine: BarAreaSpotsLine(
              show: true,
              flLineStyle: FlLine(
                color: text_color.withOpacity(0.3),
                strokeWidth: 4,
              ),
            ),
          ),
        )
      ],
    ),
    swapAnimationDuration: const Duration(milliseconds: 200),
  );
}