Question

创建此函数时出现错误... b1.getLineTo1(p1)和b2.getLineTo2(p2)的第50行和第53行的错误...是Flutter，我想在两个或多个对象之间建立连线。

感谢前进

import 'package:flutter_test/flutter_test.dart';

enum Place { left, top, right, bottom }

class Bound {
  double x;
  double y;
  Place place;

  Bound({this.x, this.y, this.place});

  List<Line> getLineTo1(Bound to) {
    return [Line(b1: Bound(), p1: Point())];
  }

  List<Line> getLineTo2(Bound to) {
    return [Line(b2: Bound(), p2: Point())];
  }
}

class Point {
  double x;
  double y;

  Point({this.x, this.y});

  List<Line> checkPoint(Point space) {
    return [Line(p1: Point(), p2: Point())];
  }
}

class Line {
  Bound b1;
  Bound b2;
  Point p1;
  Point p2;

  Line({this.b1, this.b2, this.p1, this.p2});
}

void main1() {
  test("Left to Top", () {
    Bound b1 = Bound(place: Place.left, x: 0, y: 0);
    Bound b2 = Bound(place: Place.top, x: -20, y: 20);
    Point p1 = Point(x: b2.x + 5, y: b1.y);
    Point p2 = Point(x: b2.x, y: b1.y + 5);
    double radius;
    radius = 2 * 22 / 7 * 5 / 4;

    List<Line> lines1 = b1.getLineTo1(p1);
    expect(lines1?.length, 2);

    List<Line> lines2 = b2.getLineTo2(p2);
    expect(lines2?.length, 2);

    List<Line> linesRadius = p1.checkPoint(p2);
    expect(linesRadius?.length, radius);
  });
}

Answer 1

具有以下两个功能：

void DesignerWindow::updateScale(double _scale)
{
    scale = static_cast<int>(_scale);
    scaleLbl->setText(QString("%1%").arg(scale));
}

采用类型scaleLbl = new QLabel(this); scaleLbl->setFrameStyle(QFrame::Sunken | QFrame::Panel); scaleLbl->setMinimumWidth(50); statusBar()->addPermanentWidget(scaleLbl);的参数，但在代码中位于此处：

 val listOfIds = List("a", "b")
 val strings = listOfIds.mkString("[\"", "\",\"", "\"]")
 val query = s"""{"query":{"filtered":{"query":{"match_all":{}},"filter": 
 {"terms":{"genres":${strings}}}}}"""

您要为其提供类型为List<Line> getLineTo1(Bound to) { return [Line(b1: Bound(), p1: Point())]; } List<Line> getLineTo2(Bound to) { return [Line(b2: Bound(), p2: Point())]; }而不是Bound的参数，因此请根据需要更改参数或参数。

有人可以帮我修复此功能吗？

1 个答案: