我需要 class 来创建使用中心坐标、高(X 轴)和宽度(y 轴)的矩形

I need class that will create rectangle using coordinates of the centers, high (X axis) and width (y axis)

矩形是在这个测试中使用

 @Test
    public void testRectangle1() {
    Point center = new Point(20, 30);
    Rectangle rect = new Rectangle(center, 20, 20);
    assertAll(
    () -> assertEquals(10, rect.getTopLeft().getX()),
    () -> assertEquals(20, rect.getTopLeft().getY()),
    () -> assertEquals(30, rect.getBottomRight().getX()),
    () -> assertEquals(40, rect.getBottomRight().getY()),
    () -> assertEquals(20, rect.getWidth()),
    () -> assertEquals(20, rect.getHeight())
        );
    }

我已经 class 因为它应该可以正常工作 我添加它主要是为了理解。

public class Point {
    private int x, y;
    public Point(int x, int y) {
        this.x = x;
        this.y = y;
    }
    public Point() {
        this(0, 0);
    }
    public int getX() {
        return x;
    }
    public void setX(int x) {
        this.x = x;
    }
    public int getY() {
        return y;
    }
    public void setY(int y) {
        this.y = y;
    }
    public void moveTo(int newX, int newY) {
        x = newX;
        y = newY;
    }
    public void moveRel(int dx, int dy) {
        x += dx;
        y += dy;
    }
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + x;
        result = prime * result + y;
        return result;
    }
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Point other = (Point) obj;
        if (x != other.x)
            return false;
        if (y != other.y)
            return false;
        return true;
    }
}

所以我停留在第二个 class 矩形本身。首先,我有点难以形成将形成矩形本身的构造函数。还有关于矩形 class 中的填充方法,因为我很难理解他们应该 return 因为我在 Java 和编码方面经验不足。

public class Rectangle {
    public int width = 0;
    public int height = 0;
    public Point center;

    public Rectangle(Point center, int width, int height) {
        int x = 0;
        int y = 0;
        width=x;
        height=y;
    }

    public Point getTopLeft() {
        Point point = new Point();
        return point;
    }

    public Point getBottomRight() {
        Point point = new Point();
        return point;
    }

    public int getWidth() {
        int x = 0;
        return x;
    }


    public int getHeight() {
        int y = 0;
        return y;
    }
}

getTopLeft()getBottomRight() 中,您可以创建一个具有中心坐标的点,然后 moveRel(int, int) 它的宽度和高度除以 2,因为您的中心点位于两者。

public Point getTopLeft() {
    Point point = new Point(center.getX(), center.getY());
    point.moveRel(- width / 2, height / 2);
    return point;
}

public Point getBottomRight() {
    Point point = new Point(center.getX(), center.getY());
    point.moveRel(width / 2, - height / 2);
    return point;
}

构造函数应将给定值写入 class 的字段。 也可以考虑使用小数类型的坐标,只有偶数的高度和宽度才能被 2 整除。