utils.dart

import 'dart:math';

import 'package:flame/src/text/elements/group_element.dart';
import 'package:flame/text.dart';
import 'package:meta/meta.dart';

@internal
double collapseMargin(double margin1, double margin2) {
  if (margin1 >= 0) {
    return (margin2 < 0) ? margin1 + margin2 : max(margin1, margin2);
  } else {
    return (margin2 < 0) ? min(margin1, margin2) : margin1 + margin2;
  }
}

@internal
TextElement? makeBackground(
  BackgroundStyle? style,
  double width,
  double height,
) {
  if (style == null) {
    return null;
  }
  final out = <TextElement>[];
  final backgroundPaint = style.backgroundPaint;
  final borderPaint = style.borderPaint;
  final borders = style.borderWidths;
  final radius = style.borderRadius;

  if (backgroundPaint != null) {
    if (radius == 0) {
      out.add(RectElement(width, height, backgroundPaint));
    } else {
      out.add(RRectElement(width, height, radius, backgroundPaint));
    }
  }
  if (borderPaint != null) {
    if (radius == 0) {
      out.add(
        RectElement(
          width - borders.horizontal / 2,
          height - borders.vertical / 2,
          borderPaint,
        )..translate(borders.left / 2, borders.top / 2),
      );
    } else {
      out.add(
        RRectElement(
          width - borders.horizontal / 2,
          height - borders.vertical / 2,
          radius,
          borderPaint,
        )..translate(borders.left / 2, borders.top / 2),
      );
    }
  }
  if (out.isEmpty) {
    return null;
  }
  if (out.length == 1) {
    return out.first;
  } else {
    return GroupElement(width: width, height: height, children: out);
  }
}