java - 如何使用按钮 (java) 更改绘图的大小？

Question

我正在画花，我需要在按下“施肥”按钮时将“头部”的大小加倍，然后在按下“重置大小”按钮时将其重置为原始大小。我正在使用 Netbeans。到目前为止，我所做的一切都没有奏效……帮助？ :)

面板代码:

package Versie4;
import java.awt.Color;
import java.awt.Graphics;

public class PanelFlowers extends javax.swing.JPanel {

    private int amount, size;
    private String color = "";

    public PanelFlowers() {
        initComponents();
        repaint();
    }

    @Override
    public void paintComponent(Graphics g){
        super.paintComponent(g);

        int teller;

        g.setColor(Color.RED);  //flowerpot
        g.fillRect(300, 350, 500, 100);

        int x = 1;
        int size = 40;
        for (teller=1; teller <= amount ;teller++) { 

            //Flower 1
        g.setColor(Color.GREEN);  //stem
        g.fillRect(320 + x, 250, 10, 100);


            switch (color) {            //Colours of petals
                case "red":
                    g.setColor(Color.red);
                    break;
                case "blue":
                    g.setColor(Color.blue);
                    break;
                case "yellow":
                    g.setColor(Color.yellow);
                    break;
                case "orange":
                    g.setColor(Color.orange);
                    break;
                case "pink":
                    g.setColor(Color.PINK);
                    break;
                case "purple":
                    g.setColor(new Color(102, 0, 204));
                    break;
            }

        g.fillOval(304 + x, 190, size, size); //petals
        g.fillOval(330 + x, 210, size, size);
        g.fillOval(320 + x, 240, size, size);
        g.fillOval(290 + x, 240, size, size);
        g.fillOval(280 + x, 210, size, size);


        g.setColor(Color.YELLOW);  //pistil
        g.fillOval(312 + x, 225, 25, 25);

        x = teller * 80;

        }



    }


    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        lblamount = new javax.swing.JLabel();
        txtamount = new javax.swing.JTextField();
        lblcolor = new javax.swing.JLabel();
        txtcolor = new javax.swing.JTextField();
        btngrow = new javax.swing.JButton();
        btnreset = new javax.swing.JButton();
        btnfertilize = new javax.swing.JButton();

        lblamount.setText("Amount: ");

        txtamount.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                txtamountActionPerformed(evt);
            }
        });

        lblcolor.setText("Color: ");

        txtcolor.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                txtcolorActionPerformed(evt);
            }
        });

        btngrow.setText("Grow!");
        btngrow.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btngrowActionPerformed(evt);
            }
        });

        btnreset.setText("Reset Size");

        btnfertilize.setText("Fertilize");
        btnfertilize.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnfertilizeActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(lblamount)
                .addGap(18, 18, 18)
                .addComponent(txtamount, javax.swing.GroupLayout.PREFERRED_SIZE, 57, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(41, 41, 41)
                .addComponent(lblcolor)
                .addGap(18, 18, 18)
                .addComponent(txtcolor, javax.swing.GroupLayout.PREFERRED_SIZE, 59, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addComponent(btngrow)
                .addGap(18, 18, 18)
                .addComponent(btnfertilize)
                .addGap(18, 18, 18)
                .addComponent(btnreset)
                .addContainerGap(185, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(lblamount)
                    .addComponent(txtamount, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(lblcolor)
                    .addComponent(txtcolor, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(btngrow)
                    .addComponent(btnreset)
                    .addComponent(btnfertilize))
                .addContainerGap(412, Short.MAX_VALUE))
        );
    }// </editor-fold>                        

    private void txtamountActionPerformed(java.awt.event.ActionEvent evt) {                                          

    }                                         

    private void txtcolorActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
    }                                        

    private void btngrowActionPerformed(java.awt.event.ActionEvent evt) {                                        
    amount = Integer.parseInt(txtamount.getText());
    color = this.txtcolor.getText();
    repaint();

    }                                       

    private void btnfertilizeActionPerformed(java.awt.event.ActionEvent evt) {                                             
       size = size * 2;
    }                                            

    // Variables declaration - do not modify                     
    private javax.swing.JButton btnfertilize;
    private javax.swing.JButton btngrow;
    private javax.swing.JButton btnreset;
    private javax.swing.JLabel lblamount;
    private javax.swing.JLabel lblcolor;
    private javax.swing.JTextField txtamount;
    private javax.swing.JTextField txtcolor;
    // End of variables declaration                   
}

框架代码:

package Versie4;


public class FrameFlowers extends javax.swing.JFrame {


    public FrameFlowers() {
        initComponents();
        setSize(900, 600);
        setContentPane(new PanelFlowers());
    }


    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>                        

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(FrameFlowers.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(FrameFlowers.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(FrameFlowers.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(FrameFlowers.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new FrameFlowers().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                     
    // End of variables declaration                   
}

Answer 1

这次我会给你一些提示。你可以自己做。

1. 绘制椭圆时，您使用的是参数 size，它是一个 int。将此 size 变量的值更改为放大和缩小。

2. 根据此 size 变量计算所有其他大小:例如 pistil 的椭圆大小

   g.setColor(Color.YELLOW);  //pistil
   g.fillOval(312 + x, 225, size/2, size/2); // <---- removing fixed value 25
   

3. 现在，尝试根据大小更改移位变量x:

   x = teller * (size * 2);
   

编辑:现在，我已经为您做了一个解决方案，因为在演讲中解释起来会费很多话。请记住，使用几何体无法以任何简单的方式实现真实的生物体(如兔子或花朵)。但是为了放大:我的意思实际上和你想要的一样；施肥时开花。我给了你提示，这样你就能发现它有多复杂。

@Override
    public void paintComponent(Graphics g){
        super.paintComponent(g);

        int teller;

        g.setColor(Color.RED);  //flowerpot 
        g.fillRect(300, 400, 500, 100);

        int x = 1;
       // int size = 40;
        for (teller=1; teller <= amount ;teller++) { 

            //Flower 1
        g.setColor(Color.GREEN);  //stem
        g.fillRect(320 + x + size/4, 250 - size*2, size/4, 400 - (250 - size*2));


        g.setColor(new Color(102, 0, 204)); //<<---- using purple, removed switch-ase

        int centerX = 320 + x ;
        int centerY = 250 - size*2 ;

        g.fillOval(centerX - size/2 , centerY - size/4, size, size); //petals
        g.fillOval(centerX + size/2 , centerY - size/4, size, size);
        g.fillOval(centerX - size/4 , centerY + size/4, size, size);
        g.fillOval(centerX + size/4 , centerY + size/4, size, size);
       g.fillOval(centerX ,  centerY - size/2, size, size);


        g.setColor(Color.YELLOW);  //pistil
        g.fillOval(centerX + size/4 , centerY , size/2, size/2);

        x = teller * size * 3;

        }

    }

---

编辑:不要忘记在btnfertilizeActionPerformed(ActionEvent) 方法中调用repaint()。

private void btnfertilizeActionPerformed(ActionEvent evt){                                           
           size = size * 2;
           repaint();
 }  

你会发现由于除法导致的小数误差，它仍然不是那么完美。