Question

你可以运行这个程序......但是，我在理解Graphics类中的一些代码时遇到了问题。我不会责怪任何人，但这是实验练习的一部分..我需要让我的雪人挥动他（g.drawline）的手。使用按钮..或者如果你可以提供另一种方式..请做..我会很感激。

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;


public class SnowMan extends Applet implements  ActionListener
{

    Button button1 = new Button ("Wave!");
    public void init()
    {
        setLayout(new BorderLayout());
        add(button1, BorderLayout.NORTH);
        button1.addActionListener(this);
    }

    public void paint(Graphics g)
    {   



            g.fillRoundRect(240,100,10,10,10,10);
            g.fillRoundRect(264,100,10,10,10,10);
            /**
             *eyes
             */


            g.fillRoundRect(248,180,10,10,10,10);
            g.fillRoundRect(248,210,10,10,10,10);
            g.fillRoundRect(248,240,10,10,10,10);
            g.fillRoundRect(248,270,10,10,10,10);

            g.drawArc(232,65,50,70,245,50);

            /**
             *mouth
             */

            g.drawLine(200,169, 150, 125);
            g.drawLine(165,139, 145, 139);
            g.drawLine(165,139, 160, 120);

                /**
                 *
                 *right hands
                 */
            g.drawLine(300,169, 350, 125);  
            g.drawLine(333,139, 338, 120);                       


g.drawLine(333,139, 355, 138);


g.drawRoundRect(219,74,75,75,75,75);

g.setXORMode(Color.red);    


g.fillRoundRect(175,148,150,150,150,150);      

g.setPaintMode();
}

public void actionPerformed (ActionEvent e)
{       



Object source = e.getSource(); 

if (button1 == source)
{

}


}



}

Answer 1

首先，你的白色空间让我有点害怕。您可能想要考虑修复缩进和行跳过。如果您的代码整洁，人们更有可能帮助您。

更重要的是，您需要做的是更改手臂尖端的位置，并将其他两根手指的位置定位在该位置。只需根据可变位置重写手指点的位置即可。然后，您所要做的就是使用布尔值和您已设置的按钮来触发动画。

对于一个这么简单的项目你应该没关系，只需在paint函数中添加一小段代码就可以增加位置（如果你想要圆周运动，可以考虑你的x和y值的sin和余弦值））。只需增加此值，直到达到所需的限制然后转身（可能使用delta变量来合并）。

Answer 2

这是我的最终输出^^ ...

 /**
 *
 *Author : Mark Dave Soriano 
 *Studied @ STI General Santos City , Philippines
 *Copro - Exercise 
 * "Snow Man"
 *Objective: Wave the hands of the snowman
 *
 *
 */

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;

public class SnowMan extends Applet implements  ActionListener
{
            Button button2Wave = new Button ("Wave");   
            int xStart = 198;
            int yEnd = 169;
            int xEndingsStart = 150;
            int yStartEndings = 125;
            int ctr;
            int ctr2nd;

      public void init ()
      { 
            setLayout(new BorderLayout());
            add(button2Wave, BorderLayout.SOUTH);
            button2Wave.addActionListener(this);
      }
      public void paint(Graphics g)
    {   
       g.setColor(Color.blue);
       g.fillRect(0, 250, 500,150 ); // ground

       g.setColor (Color.yellow);
       g.fillOval (-40, -40, 80, 80); // sun

       g.setColor(Color.white);     
       g.fillRoundRect(219,74,75,75,75,75);//head
       g.fillRoundRect(175,148,150,150,150,150); //body
       g.fillRoundRect(63,10,130,60,80,80);//dialog oval

       g.setColor(Color.black);
       g.fillRoundRect(248,180,10,10,10,10);//body buttons
       g.fillRoundRect(248,210,10,10,10,10);//body buttons
       g.fillRoundRect(248,240,10,10,10,10);//body buttons
       g.fillRoundRect(248,270,10,10,10,10);//body buttons
       g.drawString("Hi! I'm Olaf ", 97,35);//body buttons
       g.drawString("and I like Warm Hugs ", 70,45);

       g.fillRoundRect(240,100,10,10,10,10);//eyes
       g.fillRoundRect(264,100,10,10,10,10);//eyes
       g.drawArc(232,65,50,70,245,50);//smile

       g.drawLine (230, 75, 280, 75); // brim of hat
       g.fillRect(235,50, 40, 25); // top of hat

       g.drawLine(xStart,yEnd, xEndingsStart, yStartEndings);//right arm
       g.drawLine(300,169, 350, 125);//left arm
       setBackground( Color.cyan);

       if (ctr==1)
       {
            g.clearRect(98,70,100,100);
            ctr +=1;
            g.clearRect(300,70,100,100);
            if (ctr==2)
            {
                g.drawLine(xStart,yEnd, 131, 169);
                g.drawLine(300,169,369,169);
                ctr2nd+=1;
                if(ctr2nd==4)
                {
                    ctr2nd-=3;
                }
            }
        }
        //wave down
       if(ctr2nd==2)
       {
            g.clearRect(98,70,100,100);
            ctr2nd +=1;
            g.clearRect(300,70,100,100);

            if(ctr2nd==3)
            {
                g.drawLine(xStart,yEnd, xEndingsStart, yStartEndings);
                g.drawLine(300,169, 350, 125);
                ctr-=2;
            }
       }
         //wave up

    }

    public void actionPerformed (ActionEvent e)
    {   
        Object source = e.getSource();
        if (source==button2Wave)
        {   
         System.out.println ("Counter Value: " + ctr);
         if (ctr==0)
         {
         this.repaint(98,70,100,100);
         this.repaint(300,70,100,100);
         ctr +=1;
         }
         if(ctr2nd==1)
         {
         this.repaint(98,70,100,100);
         this.repaint(300,70,100,100);
         ctr2nd+=1;
         }  
        }

    }
}

如何让我的雪人挥动他的手（画线）使用applet中的按钮

2 个答案: