Q&A
### 該当のソースコード
```java
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
// 描画した図形を記録する Figure クラス (継承して利用する)
class Figure {
protected int x, y, width, height;
protected Color color;
public Figure(int x, int y, int w, int h, Color c) {
this.x = x;
this.y = y; // this.x, this.y はインスタンス変数．
width = w;
height = h; // ローカル変数で同名の変数がある場合は，this
color = c; // を付けると，インスタンス変数を指す．
}
public void setSize(int w, int h) {
width = w;
height = h;
}
public void setLocation(int x, int y) {
this.x = x;
this.y = y;
}
public void reshape(int x1, int y1, int x2, int y2) {
}
public void draw(Graphics g) {
}
}
class CircleFigure extends Figure {
public CircleFigure(int x, int y, int w, int h, Color c) {
super(x, y, w, h, c);
}
public void reshape(int x1, int y1, int x2, int y2) {
int newx = Math.min(x1, x2);
int newy = Math.min(y1, y2);
int neww = Math.abs(x1 - x2);
int newh = Math.abs(y1 - y2);
setLocation(newx, newy);
setSize(neww, newh);
}
public void draw(Graphics g) {
g.setColor(color);
g.drawOval(x, y, width, height);
}
}
class LineFigure extends Figure {
public LineFigure(int x, int y, int w, int h, Color c) {
super(x, y, w, h, c);
}
public void reshape(int x1, int y1, int x2, int y2) {
setLocation(x1, y1);
setSize(x2, y2);
}
public void draw(Graphics g) {
g.setColor(color);
g.drawLine(x, y, width, height);
}
}
class RectangleFigure extends Figure {
public RectangleFigure(int x, int y, int w, int h, Color c) {
super(x, y, w, h, c);
// 引数付きのコンストラクタは継承されないので，コンストラクタを定義．
// superで親のコンストラクタを呼び出すだけ．
}
public void reshape(int x1, int y1, int x2, int y2) {
int newx = Math.min(x1, x2);
int newy = Math.min(y1, y2);
int neww = Math.abs(x1 - x2);
int newh = Math.abs(y1 - y2);
setLocation(newx, newy);
setSize(neww, newh);
}
public void draw(Graphics g) {
g.setColor(color);
g.drawRect(x, y, width, height);
}
}
////////////////////////////////////////////////
// Model (M)
// modelは java.util.Observableを継承する．Viewに監視される．
class DrawModel extends Observable {
protected ArrayList<Figure> fig;
protected String figurelabel;
protected Figure drawingFigure;
protected Color currentColor;
protected ViewPanel viewPanel;
public DrawModel() {
fig = new ArrayList<Figure>();
drawingFigure = null;
currentColor = Color.red;
}
public void setViewPanel(ViewPanel c) {
viewPanel = c;
}
public ArrayList<Figure> getFigures() {
return fig;
}
public Figure getFigure(int idx) {
return fig.get(idx);
}
public void createFigure(int x, int y) {
Figure f = null;
;
if (figurelabel == "rect")
f = new RectangleFigure(x, y, 0, 0, currentColor);
else if (figurelabel == "circ")
f = new CircleFigure(x, y, 0, 0, currentColor);
else if (figurelabel == "line")
f = new LineFigure(x, y, x, y, currentColor);
fig.add(f);
drawingFigure = f;
viewPanel.repaint();
setChanged();
notifyObservers();
}
public void reshapeFigure(int x1, int y1, int x2, int y2) {
if (drawingFigure != null) {
drawingFigure.reshape(x1, y1, x2, y2);
viewPanel.repaint();
setChanged();
notifyObservers();
}
}
public void changecolor(Color col) {
currentColor = col;
}
public void changefigure(String fi) {
figurelabel = fi;
}
}
////////////////////////////////////////////////
// View (V)
// Viewは，Observerをimplementsする．Modelを監視して，
// モデルが更新されたupdateする．実際には，Modelから
// update が呼び出される．
class ViewPanel extends JPanel implements Observer {
protected DrawModel model;
public ViewPanel(DrawModel m) {
this.setBackground(Color.white);
model = m;
model.addObserver(this);
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
ArrayList<Figure> fig = model.getFigures();
for (int i = 0; i < fig.size(); i++) {
Figure f = fig.get(i);
f.draw(g);
}
}
public void update(Observable o, Object arg) {
repaint();
}
}
class Select implements ActionListener {
DrawModel a;
Select(DrawModel ap) {
a = ap;
}
public void actionPerformed(ActionEvent e) { // 設定の変更
String es = e.getActionCommand();
if (es.equals("red"))
a.changecolor(Color.red);
if (es.equals("green"))
a.changecolor(Color.green);
if (es.equals("blue"))
a.changecolor(Color.blue);
if (es.equals("rect"))
a.changefigure("rect");
if (es.equals("circ"))
a.changefigure("circ");
if (es.equals("line"))
a.changefigure("line");
}
}
//////////////////////////////////////////////////
// Main class
// (GUIを組み立てているので，view の一部と考えてもよい)
class DrawFrame extends JFrame {
DrawModel model;
ViewPanel view;
DrawController cont;
public static void main(String[] args) {
JFrame f = new JFrame("Draw");
JPanel pc = new JPanel();
JPanel pf = new JPanel();
pc.setLayout(new GridLayout(1, 3));
pf.setLayout(new GridLayout(1, 3));
JButton r = new JButton("red");
JButton g = new JButton("green");
JButton b = new JButton("blue");
JButton rect = new JButton("rect");
JButton circ = new JButton("circ");
JButton line = new JButton("line");
r.setActionCommand("red");
g.setActionCommand("green");
b.setActionCommand("blue");
rect.setActionCommand("rect");
circ.setActionCommand("circ");
line.setActionCommand("line");
DrawModel a = new DrawModel();
ViewPanel dp = new ViewPanel(a);
a.setViewPanel(dp);
DrawController ml = new DrawController(a);
dp.addMouseListener(ml);
dp.addMouseMotionListener(ml);
pc.add(r);
pc.add(g);
pc.add(b);
pf.add(rect);
pf.add(circ);
pf.add(line);
b.addActionListener(new Select(a));
g.addActionListener(new Select(a));
r.addActionListener(new Select(a));
circ.addActionListener(new Select(a));
rect.addActionListener(new Select(a));
line.addActionListener(new Select(a));
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(dp, BorderLayout.CENTER);
f.getContentPane().add(pc, BorderLayout.SOUTH);
f.getContentPane().add(pf, BorderLayout.NORTH);
f.setSize(400, 300);
f.setVisible(true);
}
}
////////////////////////////////////////////////
// Controller (C)
class DrawController implements MouseListener, MouseMotionListener {
protected DrawModel model;
protected int dragStartX, dragStartY;
public DrawController(DrawModel a) {
model = a;
}
public void mouseClicked(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
dragStartX = e.getX();
dragStartY = e.getY();
model.createFigure(dragStartX, dragStartY);
}
public void mouseDragged(MouseEvent e) {
model.reshapeFigure(dragStartX, dragStartY, e.getX(), e.getY());
}
public void mouseReleased(MouseEvent e) {
model.reshapeFigure(dragStartX, dragStartY, e.getX(), e.getY());
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
public void mouseMoved(MouseEvent e) {
}
}
```
### 試したこと
コンパイルを行った.
```
「DrawFrame.java:98: 警告:[deprecation] java.utilのObservableは推奨されません
class DrawModel extends Observable {
^
DrawFrame.java:163: 警告:[deprecation] java.utilのObserverは推奨されません
class ViewPanel extends JPanel implements Observer {
^
DrawFrame.java:181: 警告:[deprecation] java.utilのObservableは推奨されません
public void update(Observable o, Object arg) {
^
警告3個」
```
といった警告を確認した.
ベストアンサー
