编写一个公共实例方法move(),该方法带有两个整数参数,它们表示更改实例变量xPos和yPos的值的数量。该方法应不返回任何值。它应该利用提供的方法delay()暂停,以便可以看到重复运行该方法的效果,例如this.delay(20);
暂停执行20毫秒。
通过移动StickFigure的实例并检查其是否对齐来测试代码。
我的代码在下面,但我似乎无法弄清楚如何将所有3个形状一起移动,只有三角形似乎在移动。
public class StickFigure
{
/*Instance variables*/
private int xPos;//The horizontal position of a StickFigure
private int yPos;//The vertical position of a StickFigure
private Circle head;
private Triangle body;
private Rectangle leg;
// add your declarations here for part (a)(i)
/**
* Constructor for objects of class StickFigure that
* provides a default stick figure near the bottom left corner of the graphical display.
*
*/
public StickFigure()
{
super();
this.head = new Circle (30, OUColour.PINK);
this.body = new Triangle (50, 50, OUColour.RED);
this.leg = new Rectangle (6, 50, OUColour.PINK);
this.setXPos(25); //sets starting position towards bottom left of Shapes window
this.setYPos(220);
this.alignAll();
}
/**
* Sets the xPos of the receiver to the value of the argument.
*/
public void setXPos(int newPos)
{
this.xPos = newPos;
this.body.setXPos(newPos);
this.alignAll();
//part (b)(iii)
}
/**
* Returns the xPos of the receiver.
*/
public int getXPos()
{
return this.xPos;
}
/**
* Sets the yPos of the receiver to the value of the argument.
*/
public void setYPos(int newPos)
{
this.yPos = newPos;
this.body.setYPos(newPos);
this.alignAll();
//part (b)(iii)
}
/**
* Returns the yPos of the receiver.
*/
public int getYPos()
{
return this.yPos;
}
/**You will need to uncomment these methods when directed to*******/
/**
* Returns a reference to the head of the receiver.
*/
public Circle getHead()
{
return this.head;
}
/**
* Returns a reference to the body of the receiver.
*/
public Triangle getBody()
{
return this.body;
}
/**
* Returns a reference to the leg of the receiver.
*/
public Rectangle getLeg()
{
return this.leg;
}
/**
* Aligns the head of the receiver relative to the xPos and yPos of the body.
*/
public void alignHead()
{
this.head.setXPos(this.body.getXPos() + (this.body.getWidth() - this.head.getDiameter())/2);
this.head.setYPos(this.body.getYPos() - this.head.getDiameter());
}
/**
* Aligns the body of the receiver relative to the xPos and yPos of the head.
*/
public void alignBody()
{
this.body.setXPos(25);
this.body.setYPos(220);
}
/**
* Aligns the leg of the receiver relative to the xPos and yPos of the head and body.
*/
public void alignLeg()
{
this.leg.setXPos(this.body.getXPos() + (this.body.getWidth() - this.leg.getWidth())/2);
this.leg.setYPos(this.body.getYPos() + this.leg.getHeight());
}
/**
* Aligns all the body parts of the receiver to form the
* StickFigure-type figure.
*/
public void alignAll()
{
this.alignBody();
this.alignHead();
this.alignLeg();
}
public void move(int xPos, int yPos)
{
this.alignAll();
this.body.setXPos(xPos + xPos);
this.body.setYPos(yPos + yPos);
this.delay(20);
}
您不应该move()
设置xPos和yPos。所以:
this.body.setXPos(xPos + xPos);
this.body.setYPos(yPos + yPos);
应该是
this.setXPos(this.xPos + xPos);
this.setYPos(this.yPos + yPos);
跟随 [alignAll()
] >>
然后您的alignBody()
说:“将接收器的身体相对于头部的xPos和yPos对齐”,但是您的方法不这样做...