所以我的老师想让我做一个互动动画。问题是他没有告诉同学们怎么做。(这是一门在线课程)。要点是他想让我做一个可以用键盘控制的图形。我在网上找了一下，但显然我没有问对问题，因为出于某种原因，我一无所获。
。我有三个代码文件。Zorx1, Zorx2，和Zorx3都是相同的外星人，只是颜色有细微差别，这是老师给的。
// 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
外星物体有所有的方法和必要的东西来移动物体，而动画应该控制这一切。
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到底应该做什么。
我找出了导致重写静态方法问题的原因。我已经将extends JFrame添加到zorx1.java中，这导致了与paint (Graphics)部分的冲突。所以我把它重命名为make (Graphics g)，希望不会造成麻烦。
我想我应该能够移动键盘交互部分到一个不同的类(我希望)，但我也有一个问题。
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);
}
new Animation (g);我找不到符号g，我不能把它加到任何地方，因为它会引起问题。我怎样才能让它认出这个符号，或者我从一开始就不需要它?
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，其中它说:"无法找到符号-方法paintComponent(java.awt.Graphics)。"
固定它。最后。
建议:
- 阅读Swing图形教程，了解使用Swing绘制的最佳方法。你似乎正在制作大量的图形代码，这根本行不通。找到源头，学会正确地去做。谷歌会帮助你找到这些教程。
- 例如，你不应该直接在JFrame上绘制。
- 用JComponent的(比如JPanel的)
paintComponent(...)方法代替。 - 避免使用keylistener，而是使用Key Bindings
- 为你的动画循环使用一个Swing Timer
- 你可以在这个网站上找到很多这样的例子(包括我的)。例如，请查看这里。
paintComponent(Graphics g)覆盖方法中。这里可以使用JVM传递给paintComponent(Graphics g)方法的Graphics对象。