?? simpledrawer.java
字號:
// 程序:簡單的繪圖游戲
// 范例文件:SimpleDrawer.java
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class SimpleDrawer extends Applet
implements MouseListener,MouseMotionListener
{
int AppletWidth,AppletHeight,drawX,drawY;
Image OffScreen;
Cursor drawCursor,eraseCursor;
Graphics drawOffScreen;
public void init()
{
addMouseListener(this); //注冊事件處理方法
addMouseMotionListener(this);
setBackground(Color.white); //設定背景為白色
AppletWidth = getSize().width; //取得Applet的高度
AppletHeight = getSize().height; //取得Applet的寬度
drawCursor = new Cursor(Cursor.CROSSHAIR_CURSOR);
eraseCursor = new Cursor(Cursor.HAND_CURSOR);
//建立次畫面
OffScreen = createImage(AppletWidth,AppletHeight);
drawOffScreen = OffScreen.getGraphics();
showStatus("請開始繪圖...");
}
public void paint(Graphics g)
{
//將次畫面貼到主畫面中
g.drawImage(OffScreen,0,0,this);
}
public void update(Graphics g) //update()方法
{
paint(g); //只單純調用paint()方法
}
//=====實現MouseListener界面=======================================
public void mouseExited(MouseEvent e) //鼠標離開Component
{
showStatus("繪圖動作結束...");
}
public void mouseClicked(MouseEvent e) //鼠標按鍵被按下后放開
{
//如果是右鍵產生的mouseClicked事件的話
if((e.getModifiers() & InputEvent.BUTTON3_MASK) != 0)
{
//清除次畫面
drawOffScreen.setColor(getBackground());
drawOffScreen.fillRect(0,0,AppletWidth,AppletHeight);
drawOffScreen.setColor(getForeground());
repaint();
}
}
public void mouseEntered(MouseEvent e) //鼠標進入Component
{
setCursor(drawCursor);
showStatus("請開始繪圖...");
}
public void mousePressed(MouseEvent e) //鼠標按鍵被按下
{
//如果是左鍵產生的mousePressed事件的話
if((e.getModifiers() & InputEvent.BUTTON1_MASK) != 0)
{
//繪制一個寬度與高度各為1的實心矩形
drawX = e.getX();
drawY = e.getY();
drawOffScreen.fillRect(drawX,drawY,1,1);
repaint();
}
}
public void mouseReleased(MouseEvent e) //鼠標按鍵放開
{
showStatus("按下" + e.getClickCount() + "次");
}
//=====實現MouseMotionListener界面=================================
public void mouseMoved(MouseEvent e) //鼠標移動時
{
if(e.isShiftDown()) //如果配合按下shift鍵
{
setCursor(eraseCursor);
//此為橡皮擦的功能
drawX = e.getX();
drawY = e.getY();
drawOffScreen.setColor(getBackground());
drawOffScreen.fillRect(drawX - 5,drawY - 5,10,10);
drawOffScreen.setColor(getForeground());
repaint();
}
else
setCursor(drawCursor);
}
public void mouseDragged(MouseEvent e) //鼠標拖曳時
{
//如果是按下左鍵拖曳的話
if((e.getModifiers() & InputEvent.BUTTON1_MASK) != 0)
{
//繪制粗線條
drawOffScreen.fillRect(drawX-3,drawY-3,6,6);
drawX = e.getX();
drawY = e.getY();
repaint();
}
}
}
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