RGB 値を作成し、それを使用してボックスを作成し、その色を塗りつぶすスライダーがあります。プログラムを初期化すると、すぐに正方形が描画されません。ただし、スライダーを動かした後、正方形が描画され、塗りつぶしが開始されます。
長方形を描画して色で塗りつぶすために使用されるメソッドは、コンストラクター中に呼び出されますが、何もせず、エラーも発生せず、正方形を描画しません。スライダーは、状態の変化時に SAME メソッドを呼び出し、正方形を描画します。意味がない。
これは、他の人がいくつかの基盤の欠如で経験する可能性があることだと確信しています.
これが私のコードです。コピーして貼り付けてjGraspなどで実行すると、私の意味を確認できます。ありがとう！
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class Colors extends javax.swing.JFrame {
public Colors() {
initComponents();
addSliderListeners();
addSliderLabels();
this.setTitle("Color Mixer");
sliderRed.setValue(150);
sliderGreen.setValue(125);
sliderBlue.setValue(215);
updateImage();
}
private void addSliderListeners(){
sliderRed.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
updateImage();
}
});
sliderGreen.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
updateImage();
}
});
sliderBlue.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
updateImage();
}
});
}
private void updateImage(){
lblRedDec.setText(""+sliderRed.getValue());
lblRedDec.setForeground(new Color(sliderRed.getValue(),0,0));
lblRedHex.setText(Integer.toHexString(sliderRed.getValue()));
lblRedHex.setForeground(lblRedDec.getForeground());
lblGreenDec.setText(""+sliderGreen.getValue());
lblGreenDec.setForeground(new Color(0,sliderGreen.getValue(),0));
lblGreenHex.setText(Integer.toHexString(sliderGreen.getValue()));
lblGreenHex.setForeground(lblGreenDec.getForeground());
lblBlueDec.setText(""+sliderBlue.getValue());
lblBlueHex.setText(Integer.toHexString(sliderBlue.getValue()));
lblBlueDec.setForeground(new Color(0,0,sliderBlue.getValue()));
lblBlueHex.setForeground(lblBlueDec.getForeground());
Graphics2D g2 = (Graphics2D)this.getGraphics();
g2.setColor(new Color(sliderRed.getValue(),sliderGreen.getValue(),sliderBlue.getValue()));
g2.fill(new Rectangle(25,125,250,250));
}
private void addSliderLabels() {
sliderRed.setPaintLabels(true);
sliderGreen.setPaintLabels(true);
sliderBlue.setPaintLabels(true);
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
sliderRed = new javax.swing.JSlider();
lblRed = new javax.swing.JLabel();
lblRedHex = new javax.swing.JLabel();
lblRedDec = new javax.swing.JLabel();
sliderGreen = new javax.swing.JSlider();
lblGreen = new javax.swing.JLabel();
lblGreenHex = new javax.swing.JLabel();
lblGreenDec = new javax.swing.JLabel();
sliderBlue = new javax.swing.JSlider();
lblBlue = new javax.swing.JLabel();
lblBlueHex = new javax.swing.JLabel();
lblBlueDec = new javax.swing.JLabel();
lblTitle = new java.awt.Label();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setResizable(false);
sliderRed.setMajorTickSpacing(15);
sliderRed.setMaximum(255);
sliderRed.setMinorTickSpacing(5);
sliderRed.setOrientation(javax.swing.JSlider.VERTICAL);
sliderRed.setPaintTicks(true);
sliderRed.setValue(212);
sliderRed.setCursor(new java.awt.Cursor(java.awt.Cursor.DEFAULT_CURSOR));
sliderRed.setName(""); // NOI18N
lblRed.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
lblRed.setText("Red");
lblRedHex.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
lblRedHex.setText("hex");
lblRedDec.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
lblRedDec.setText("dec");
sliderGreen.setMajorTickSpacing(15);
sliderGreen.setMaximum(255);
sliderGreen.setMinorTickSpacing(5);
sliderGreen.setOrientation(javax.swing.JSlider.VERTICAL);
sliderGreen.setPaintTicks(true);
sliderGreen.setSnapToTicks(true);
sliderGreen.setValue(35);
sliderGreen.setCursor(new java.awt.Cursor(java.awt.Cursor.DEFAULT_CURSOR));
sliderGreen.setName(""); // NOI18N
lblGreen.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
lblGreen.setText("Green");
lblGreenHex.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
lblGreenHex.setText("hex");
lblGreenDec.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
lblGreenDec.setText("dec");
sliderBlue.setMajorTickSpacing(15);
sliderBlue.setMaximum(255);
sliderBlue.setMinorTickSpacing(5);
sliderBlue.setOrientation(javax.swing.JSlider.VERTICAL);
sliderBlue.setPaintTicks(true);
sliderBlue.setSnapToTicks(true);
sliderBlue.setValue(218);
sliderBlue.setCursor(new java.awt.Cursor(java.awt.Cursor.DEFAULT_CURSOR));
sliderBlue.setName(""); // NOI18N
lblBlue.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
lblBlue.setText("Blue");
lblBlueHex.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
lblBlueHex.setText("hex");
lblBlueDec.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
lblBlueDec.setText("dec");
lblTitle.setFont(new java.awt.Font("Dialog", 0, 36)); // NOI18N
lblTitle.setText("Color Mixer");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap()
.addComponent(lblTitle, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 125, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(layout.createSequentialGroup()
.addGap(27, 27, 27)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(lblRedHex)
.addComponent(lblRed)
.addComponent(lblRedDec))
.addGap(25, 25, 25))
.addComponent(sliderRed, javax.swing.GroupLayout.PREFERRED_SIZE, 71, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(sliderGreen, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 71, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(lblGreenHex)
.addComponent(lblGreen)
.addComponent(lblGreenDec))
.addGap(25, 25, 25)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(sliderBlue, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 71, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(lblBlueHex)
.addComponent(lblBlue)
.addComponent(lblBlueDec))
.addGap(25, 25, 25))))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(23, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(layout.createSequentialGroup()
.addComponent(lblBlueDec)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(lblBlueHex)
.addGap(18, 18, 18)
.addComponent(lblBlue)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(sliderBlue, javax.swing.GroupLayout.PREFERRED_SIZE, 285, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addComponent(lblGreenDec)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(lblGreenHex)
.addGap(18, 18, 18)
.addComponent(lblGreen)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(sliderGreen, javax.swing.GroupLayout.PREFERRED_SIZE, 285, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addComponent(lblRedDec)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(lblRedHex)
.addGap(16, 16, 16)
.addComponent(lblRed)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(sliderRed, javax.swing.GroupLayout.PREFERRED_SIZE, 285, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addComponent(lblTitle, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(38, 38, 38))
);
lblTitle.getAccessibleContext().setAccessibleName("");
lblTitle.getAccessibleContext().setAccessibleDescription("");
pack();
}// </editor-fold>
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(Colors.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Colors.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Colors.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Colors.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 Colors().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel lblBlue;
private javax.swing.JLabel lblBlueDec;
private javax.swing.JLabel lblBlueHex;
private javax.swing.JLabel lblGreen;
private javax.swing.JLabel lblGreenDec;
private javax.swing.JLabel lblGreenHex;
private javax.swing.JLabel lblRed;
private javax.swing.JLabel lblRedDec;
private javax.swing.JLabel lblRedHex;
private java.awt.Label lblTitle;
private javax.swing.JSlider sliderBlue;
private javax.swing.JSlider sliderGreen;
private javax.swing.JSlider sliderRed;
// End of variables declaration
}