[J2SE] canvas物件顯示圖片的問題

看板java作者yuntechvb (雲寶寶)時間15年前 (2009/07/17 00:28)推噓0(0推 0噓 5→)

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各位大大好小弟是剛接觸swing的新手想請問一下 canvas物件利用方法paint將圖片載入但是圖片大過視窗大小圖片就會被剪掉有何方法可以避免這個問題呢？補上一些漏掉的訊息因為我是要做類似地圖的功能所以會有拖曳的作動在拖曳的事件下有加入repaint的動作不過還是無法讓被裁掉的部份復原例如：今天我的圖有800*800 jframe為canvas的container jframe的大小為500*500 canvas的大小和圖的大小一樣大(800*800) canvas物件有加入滑鼠拖曳的動作不過執行後canvas只能顯示出500*500 其他部份都變成預設的底色附上程式碼： public class j5_test{ ImageIcon temp = new ImageIcon("bg.jpg"); JFrame f_main = new JFrame(""); int x1,y1,newx,newy; float scale=1f; Canvas canvas1 = new Canvas(){ public void paint(Graphics g) { super.paint(g); Graphics2D g2d=(Graphics2D) g; AffineTransform at=new AffineTransform(); at.scale(scale,scale); g2d.setTransform(at); g2d.drawImage(temp.getImage(), at, null); } }; j5_test(){ Dimension screen = Toolkit.getDefaultToolkit().getScreenSize(); f_main.getContentPane().setLayout(null); f_main.setBounds(0, 0, 300, 300); f_main.addWindowFocusListener( new WindowAdapter(){ public void windowClosing(WindowEvent e){ System.exit(0); } } ); canvas1.setBounds(-50, -50, 500, 500); f_main.getContentPane().add(canvas1); f_main.show(); canvas1.addMouseListener(new MouseAdapter() { public void mousePressed(MouseEvent evt) { x1=evt.getX(); y1=evt.getY(); } }); canvas1.addMouseMotionListener(new MouseMotionAdapter() { public void mouseDragged(MouseEvent evt) { newx = evt.getX()-x1+canvas1.getX(); newy = evt.getY()-y1+canvas1.getY(); if (newx >= 0){ newx = 0; } if (newy >= 0){ newy = 0; } if (newx+canvas1.getWidth() <= f_main.getWidth()){ newx = canvas1.getX(); } if(newy+canvas1.getHeight() <= f_main.getHeight()){ newy = canvas1.getY(); } canvas1.setLocation(newx, newy); } }); } public static void main(String[] args){ j5_test Test = new j5_test(); } } 隨便放一張大於300*300的圖到目錄下就可以測試了，檔名bg.jpg -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 218.163.207.124

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sbrhsieh

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yuntechvb

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※ 編輯: yuntechvb 來自: 218.163.207.124 (07/17 00:56)

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yuntechvb

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