【发布时间】：2013-03-09 00:23:43
【问题描述】：
所以我的老师要我制作一个互动动画。问题是他没有告诉全班怎么做。 （这是一个在线课程）。要点是他希望我制作一个可以用键盘控制的图形。我在网上环顾四周，但显然我没有问对正确的问题，因为出于某种原因，我会空空如也。
无论如何。我有三个代码文件。 Zorx1、Zorx2、Zorx3是同一个外星人，颜色有细微差别，老师给的。
// The Zorx alien object
import java.awt.*;
public class Zorx1
{
/* the fields of the object defined here as static to make the
interface as simple as possible to start*/
static int x = 100, y = 100;
static int size = 50;
static Color clr = Color.red;
static boolean showing = false;
// paints Zorx on the screen Note this method is not part of Interface
static void paint (Graphics g)
{
g.setColor (clr);
g.fillRect (x, y, size / 4, size);
g.setColor (Color.black);
g.drawLine (x-3,y-2,x-1,y+size/8);//These four lines will add fangs to this guy. Nasty!
g.drawLine (x-2,y-2,x-1,y+size/8);
g.drawLine (x+3,y-2,x+5,y+size/8);
g.drawLine (x+2,y-2,x+4,y+size/8);
g.setColor (clr);
g.fillOval (x - (3 * size / 8), y - (size / 2), size, size / 2);
g.drawLine (x - 3 * size / 8, y + size, x - 3 * size / 8 + size, y + size);
g.drawLine (x, y + size / 2, x - size, y);
g.drawLine (x - size, y, x - size, y - size / 4);
g.drawOval (x - size - size / 8, y - size / 4 - size / 8, size / 8, size / 8);
g.setXORMode (Color.black); //Makes his eyes black. Sinister
g.fillOval (x - size / 4, y - size / 3, size / 12, size / 12);
g.fillOval (x + size / 4, y - size / 3, size / 12, size / 12);
g.fillOval (x - size / 1000, y - size / 4, size / 12, size / 12); //adds a third eye to our alien. Spooooooooky.
g.setPaintMode ();
} // end of paint method
// Show the Zorx alien. The show method is part of the interface.
public static void show (Graphics g)
{
paint (g);
showing = true;
} // end of show method
// Erase Zorx from the screen. The erase method
// is not part of the interface.
static void erase (Graphics g, Color backgroundColor)
{
g.setColor (backgroundColor);
g.fillRect (x, y, size / 4, size);
g.fillOval (x - (3 * size / 8), y - (size / 2), size, size / 2);
g.drawLine (x-3,y-2,x-1,y+size/8);
g.drawLine (x-2,y-2,x-1,y+size/8);
g.drawLine (x+3,y-2,x+5,y+size/8);
g.drawLine (x+2,y-2,x+4,y+size/8);
g.drawLine (x - 3 * size / 8, y + size, x - 3 * size / 8 + size, y + size);
g.drawLine (x, y + size / 2, x - size, y);
g.drawLine (x - size, y, x - size, y - size / 4);
g.drawOval (x - size - size / 8, y - size / 4 - size / 8, size / 8, size / 8);
g.fillOval (x - size / 4, y - size / 3, size / 12, size / 12);
g.fillOval (x + size / 4, y - size / 3, size / 12, size / 12);
} // end of erase method
// Hide Zorx The hide method is part of the interface.
public static void hide (Graphics g, Color backgroundColor)
{
erase (g, backgroundColor);
showing = false;
} // end of hide method
// Move Zorx from one location to another. The move method
// is part of the interface.
public static void move (int newX, int newY, Graphics g, Color backgroundColor)
{
if (showing)
{
erase (g, backgroundColor);
}
x = newX;
y = newY;
if (showing)
{
show (g);
}
} // end of move method
} // end of Zorx Class
外星物体具有移动物体所需的所有方法和一切，而动画应该控制所有这些。
import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Animation extends JFrame implements KeyListener
{
public Animation (Graphics g)
{
Zorx1.show(g);
Zorx2.show(g);
Zorx3.show(g);
this.setFocusable(true);
}
public static void main (String args[])
{
Animation application = new Animation(g);
application.setVisible(true);
}
public int x=100;
public int y=100;
public void keyPressed (KeyEvent e)
{
switch (e.getKeyCode()) //I can't seem to get this thing to animate through this so this is just left blank for the sake of necessity.
{
case KeyEvent.VK_LEFT:
break;
case KeyEvent.VK_RIGHT:
break;
case KeyEvent.VK_DOWN:
break;
case KeyEvent.VK_UP:
break;
}
}
public void keyTyped(KeyEvent e)
{
if (e.getKeyChar() == KeyEvent.VK_LEFT)
{
left(g);
}
else if (e.getKeyChar() == KeyEvent.VK_RIGHT)
{
right(g);
}
else if (e.getKeyChar() == KeyEvent.VK_UP)
{
up(g);
}
else if (e.getKeyChar() == KeyEvent.VK_DOWN)
{
down(g);
}
if (e.getKeyChar() == KeyEvent.VK_ESCAPE)
{
System.exit(0);
// If you hit escape you will exit the animation
}
}
public void left (Graphics g)
{
x=x-10;
Zorx1.move (x,y, g, getBackground ());
Zorx2.move (x,y+50,g,getBackground());
Zorx3.move (x,y+100,g,getBackground());
}
public void right (Graphics g)
{
x=x+10;
Zorx1.move (x,y,g,getBackground());
Zorx2.move (x,y+50,g,getBackground());
Zorx3.move (x,y+100,g,getBackground());
}
public void up(Graphics g)
{
y=y-10;
Zorx1.move (x,y,g,getBackground());
Zorx2.move (x,y+50,g,getBackground());
Zorx3.move (x,y+100,g,getBackground());
}
public void down(Graphics g)
{
y=y+10;
Zorx1.move (x,y,g,getBackground());
Zorx2.move (x,y+50,g,getBackground());
Zorx3.move (x,y+100,g,getBackground());
}
public void keyReleased(KeyEvent e)
{
switch (e.getKeyCode())
{
case KeyEvent.VK_LEFT:
break;
case KeyEvent.VK_RIGHT:
break;
case KeyEvent.VK_DOWN:
break;
case KeyEvent.VK_UP:
break;
}
}
}
我知道上面的代码不起作用，但这可能是因为我不知道我应该做什么。
我找出了导致压倒一切的静态方法问题的原因。我已将扩展 JFrame 添加到 zorx1.java 事物中，这导致与绘画（图形 g）部分发生冲突。所以我只是将它重命名为 make (Graphics g)。希望这不会引起并发症。
我认为我应该能够将键盘交互部分移到不同的类中（我希望如此），但我也遇到了问题。
public class Animation extends JFrame
{
public int x=100;
public int y=100;
public Animation (Graphics g)
{
Zorx1.show(g);
Zorx2.show(g);
Zorx3.show(g);
}
public static void main (String args[])
{
Animation application = new Animation (g);
}
新动画（g）；找不到符号 g。而且我不能在任何地方添加它，因为它会导致问题。我怎样才能让它识别符号，或者我一开始就不需要它？
public Animation ()
{
repaint();
}
public void paintComponent (Graphics g)
{
super.paintComponent(g);
Zorx1.show(g);
Zorx2.show(g);
Zorx3.show(g);
}
好的，我想我明白了，但是 super.paintComponent(g);正在返回一个错误，其中显示：“找不到符号 - 方法 paintComponent(java.awt.Graphics)。”
修复它。最后。
【问题讨论】：
-
请重新阅读我的帖子和教程。我已经多次告诉过你这个方法必须驻留在什么类型的类中。
标签： java swing animation keylistener key-bindings