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

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英文:

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

问题

以下是您提供的内容的翻译:

// 测试中创建矩形
@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())
    );
}

// 点类已经存在,应该能正确工作,主要是为了理解我大部分添加的。
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;
    }
}

// 因此我在矩形本身的第二个类中卡住了。首先,我有点难以形成构造函数,该构造函数将形成矩形本身。
// 并且在矩形类中填充方法时也遇到了问题,因为我在理解上有些困难,因为我在Java和编码方面经验有限。
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;
    }
}
英文:

Rectangle is formed using on this test

 @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())
);
}

I already have class for point it should work correctly i mostly add it for understanding.

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;
}
}

So i stuck in second class for rectangle itself. First of all i kinda have hard time forming consructor that will form rectangle itself. And also on filling methods in rectangle class, as i have hard time in uderstanding what they should return becouse i have little experience in Java and coding.

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;
}
}

答案1

得分: 0

getTopLeft()getBottomRight()方法中,您可以使用中心坐标创建一个点,然后通过宽度和高度除以2来使用moveRel(int, int)方法进行平移,因为您的中心点位于两者之间。

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;
}

构造函数应该将给定的值写入类的字段中。还要考虑为坐标使用小数类型,只有偶数的高度和宽度才能被2整除。

英文:

In getTopLeft() and getBottomRight() you could create a point with center coordinates and then moveRel(int, int) it by width and height divided by 2, as you center point is in the middle of the both.

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;
}

Constructor should write given values to the fields of the class.
Also consider using decimal type for the coordinates, only even height and width would be divisible by 2.

huangapple
  • 本文由 发表于 2020年8月25日 15:15:17
  • 转载请务必保留本文链接:https://go.coder-hub.com/63573787.html
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