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java动画——自定义光标
摘要: java动画——自定义光标
// 程序：使用自订光标
// 范例文件：UseMyCursor.java
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class UseMyCursor extends Applet
implements MouseListener,MouseMotionListener
{
int AppletWidth,AppletHeight,drawX,drawY;
Image MyCursor1,MyCursor2;
Cursor myCursor1,myCursor2;
Toolkit TK;
MediaTracker MT;
Image OffScreen;
Graphics drawOffScreen;
public void init()
{
addMouseListener(this); //注册事件处理方法
addMouseMotionListener(this);
TK = getToolkit(); //取得Toolkit
//取得自订光标图像
MyCursor1 = getImage(getDocumentBase(),"Images/hammer1.gif");
MyCursor2 = getImage(getDocumentBase(),"Images/hammer2.gif");
MT = new MediaTracker(this);
MT.addImage(MyCursor1,0);
MT.addImage(MyCursor2,0);
AppletWidth = getSize().width; //取得Applet的高度
AppletHeight = getSize().height; //取得Applet的宽度
OffScreen = createImage(AppletWidth,AppletHeight);
drawOffScreen = OffScreen.getGraphics();
try
{
MT.waitForAll();
}
catch(InterruptedException E){ } //没有进行异常处理
//建立新游标
try
{
myCursor1 = TK.createCustomCursor(MyCursor1,new Point(0,0),"hammer1");
myCursor2 = TK.createCustomCursor(MyCursor2,new Point(0,0),"hammer2");
}
catch(IndexOutOfBoundsException E){ }
setCursor(myCursor1); //设定使用新光标
}
public void update(Graphics g) //update()方法
{
paint(g); //只单纯调用paint()方法
}
public void paint(Graphics g)
{
//将次画面贴到主画面中
g.drawImage(OffScreen,0,0,this);
}
//=====实现MouseListener界面=======================================
public void mouseClicked(MouseEvent e) //鼠标按键被按下后放开
{
//如果是右键产生的mouseClicked事件的话
if((e.getModifiers() & InputEvent.BUTTON3_MASK) != 0)
{
//清除次画面
drawOffScreen.setColor(getBackground());
drawOffScreen.fillRect(0,0,AppletWidth,AppletHeight);
drawOffScreen.setColor(getForeground());
repaint();
}
}
public void mousePressed(MouseEvent e) //鼠标按键被按下
{
setCursor(myCursor2);
//如果是左键产生的mousePressed事件的话
if((e.getModifiers() & InputEvent.BUTTON1_MASK) != 0)
{
drawX = e.getX();
drawY = e.getY();
drawOffScreen.drawOval(drawX+20,drawY+30,1,1);
drawOffScreen.drawOval(drawX+15,drawY+25,10,10);
drawOffScreen.drawOval(drawX+10,drawY+20,20,20);
repaint();
}
}
public void mouseExited(MouseEvent e){ } //鼠标离开Component
public void mouseEntered(MouseEvent e){ } //鼠标进入Component
public void mouseReleased(MouseEvent e) //鼠标按键放开
{
setCursor(myCursor1);
}
//=====实现MouseMotionListener界面================================
public void mouseMoved(MouseEvent e) //鼠标移动时
{
drawX = e.getX();
drawY = e.getY();
showStatus("(" + e.getX() + "," + e.getY() + ")");
}
public void mouseDragged(MouseEvent e){ } //鼠标拖曳时
}
对于光标就是一种资源，说到底就是一种图像。所以我们可以使用下面的定义
Image MyCursor1,MyCursor2;
Cursor myCursor1,myCursor2;
Toolkit TK;
先取得Toolkit，再得到图像：
TK = getToolkit(); //取得Toolkit
//取得自订光标图像
MyCursor1 = getImage(getDocumentBase(),"Images/hammer1.gif");
MyCursor2 = getImage(getDocumentBase(),"Images/hammer2.gif");
得到有注册点的光标：
myCursor1 = TK.createCustomCursor(MyCursor1,new Point(0,0),"hammer1");
myCursor2 = TK.createCustomCursor(MyCursor2,new Point(0,0),"hammer2");
最后使用下面的代码设置光标：
setCursor(myCursor1);