我正在画花，当我按下“施肥”按钮时，我需要将“头部”尺寸加倍，然后当我按下“重置尺寸”按钮时将其重置为原始尺寸。我正在使用 Netbeans。到目前为止，我尝试过的所有方法都没有效果……有帮助吗？ :)
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
}
最佳答案
这次我会给你一些提示。你可以自己做。
当您绘制椭圆形时，您使用的是参数
size，它是一个int。更改此size变量的值以放大和缩小。根据此
size变量计算每个其他尺寸:例如pistil的椭圆形尺寸g.setColor(Color.YELLOW); //pistil g.fillOval(312 + x, 225, size/2, size/2); // <---- removing fixed value 25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，因为在演讲中需要太多的文字来解释。请记住，使用几何无法以任何简单的方式实现真实的生命对象(例如兔子或花)。然而，对于放大:我实际上意味着你想要的同样的事情；当我们施肥时，花朵就会生长。我给了你一些提示，以便你能够发现它有多么复杂。
@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 btnifereActionPerformed(ActionEvent) 方法中调用 repaint()。
private void btnfertilizeActionPerformed(ActionEvent evt){
size = size * 2;
repaint();
}
你会发现它仍然不是那么完美，因为除法产生了小数误差。
关于java - 如何使用按钮(java)更改绘图的大小？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20175298/