我正在扩展Java中的图像编辑应用程序。我想创建一个可以调整图像对比度的类。主类调用应用方法并传递必须修改的图像。我设法创建了 JFrame 和用于计算的算法,但我在使用操作侦听器时遇到了问题,因为我不知道如何让我的应用方法等待用户输入,然后才计算和编辑图像。下面是对比度类的代码:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
lic class ContrastFilter extends Filter implements ActionListener {
private JFrame contFr;
private JButton ok;
private JTextField textF;
private String s;
private int contV;
private int factor;
public ContrastFilter(String name){
super(name);
}
public void makeFrame(){
contFr = new JFrame("contrast window");
Container contentPane = contFr.getContentPane();
contentPane.setLayout(new FlowLayout());
JLabel label = new JLabel("Enter contrast");
contentPane.add(label, BorderLayout.PAGE_START);
textF = new JTextField(5);
contentPane.add(textF, BorderLayout.PAGE_START);
ok = new JButton("OK");
ok.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event)
{
if (event.getSource() == ok){
s = textF.getText();
contV = Integer.parseInt(s);
factor = Math.round((259*(contV+255))/(255*(259 - contV)));
}}
});
contentPane.add(ok, BorderLayout.PAGE_START);
contFr.pack();
contFr.setVisible(true);
}
public void apply(OFImage image) {
makeFrame();
int height = image.getHeight();
int width = image.getWidth();
for(int y = 0; y < height; y++) {
for(int x = 0; x < width; x++) {
Color pix = image.getPixel(x, y);
image.setPixel(x, y, new Color(trunC(factor*(pix.getRed()-128)+128),
trunC(factor*(pix.getGreen()-128)+128),
trunC(factor*(pix.getBlue()-128)+128)));
} } }
public int trunC(int a){
if (a>255){
return 255;
}
return a;
}
}
如果您希望apply()
方法在单击按钮"确定"后工作(用户输入某些内容,然后单击确定),则需要在ActionListener的actionPerformed()
方法主体中放置apply()
调用。