java - 查找hsb颜色的h、s和b

Question

我正在制作一个 HSB 颜色选择器。您可以输入颜色的色相、饱和度、亮度，它会将您输入的颜色变成一个小方块。现在我允许用户保存颜色，这是可行的，但我希望这样当您按下“打开颜色”按钮时，h、s 和 b 文本输入框会显示 h、s 和 b 值保存的颜色。这是我的代码：

@SuppressWarnings("serial")
public class Main extends Applet implements ActionListener, java.io.Serializable {
private Rectangle color;
Random randomColor = new Random();
TextField one;
TextField two;
TextField three;
Button enter;
Button random;
Button save;
Button open;
String hvalue="255";
String svalue="0";
String bvalue="255";
Color hsb = Color.getHSBColor(Integer.parseInt(hvalue), Integer.parseInt(bvalue), Integer.parseInt(svalue));

int width = 320;
int height = 260;
String version = "0.0.1";
String name = "Color Picker"; 


public void init() {
    setSize(width, height); 
    Frame c = (Frame)this.getParent().getParent();
    c.setTitle(name + " - Version " + version);
    setLayout(null);
    color = new Rectangle(width/2-32, 20, 64, 64);

    one = new TextField("", 15);
    one.setBounds(width/2-60, height-120, 40, 20);
    add(one);
    two = new TextField("", 15);
    two.setBounds(width/2-20, height-120, 40, 20);
    add(two);
    three = new TextField("", 15);
    three.setBounds(width/2+20, height-120, 40, 20);
    add(three);
    enter = new Button("Enter");
    enter.setBounds(width/2-50, height-80, 100, 20);
    add(enter);
    enter.addActionListener(this);
    random = new Button("Random Color");
    random.setBounds(width/2-50, height-60, 100, 20);
    add(random);
    random.addActionListener(this);
    save = new Button("Save Color");
    save.setBounds(width/2-50, height-40, 100, 20);
    add(save);
    save.addActionListener(this);
    open = new Button("Open Color");
    open.setBounds(width/2-50, height-20, 100, 20);
    add(open);
    open.addActionListener(this);
}


public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D)g;
    g2.setColor(hsb);
    g2.fill(color);
}


@Override
public void actionPerformed(ActionEvent evt) {
    if (evt.getSource() == enter) {
        hvalue = one.getText();
        svalue = two.getText();
        bvalue = three.getText();
        try {
            hsb = Color.getHSBColor(Integer.parseInt(hvalue), Integer.parseInt(bvalue), Integer.parseInt(svalue));
            repaint();
        }
        catch (Exception e) {}
    }

    else if (evt.getSource() == random) {
        hvalue = String.valueOf(randomColor.nextInt(200));
        svalue = String.valueOf(randomColor.nextInt(200));
        bvalue = String.valueOf(randomColor.nextInt(200));
        one.setText(hvalue);
        two.setText(svalue);
        three.setText(bvalue);
        try {
            hsb = Color.getHSBColor(Integer.parseInt(hvalue), Integer.parseInt(bvalue), Integer.parseInt(svalue));
            repaint();
        }
        catch (Exception e) {}
    }

    else if (evt.getSource() == save) {
        try {
            FileOutputStream fileOut = new FileOutputStream("/C:/Users/Barbara/Downloads/color.color");
            ObjectOutputStream out = new ObjectOutputStream(fileOut);
            out.writeObject(hsb);
            out.close();
            fileOut.close();
        } catch(IOException i) {
            i.printStackTrace();
        }
    }

    else if (evt.getSource() == open) {
        Color openhsb = null;
        try {
            FileInputStream fileIn = new FileInputStream("/C:/Users/Barbara/Downloads/color.color");
            ObjectInputStream in = new ObjectInputStream(fileIn);
            openhsb = (Color) in.readObject();
            in.close();
            fileIn.close();
            try {
                hsb = openhsb;
                repaint();
            }
            catch (Exception e) {}
        } catch(IOException i) {
            i.printStackTrace();
            return;
        } catch(ClassNotFoundException c) {
            c.printStackTrace();
            return;
        }
    }

}
}

我应该将 h、s 和 b 值保存到 color1.color 文件吗？如果是这样的话，我不知道该怎么做。

Answer 1

你可以使用Color类提供的转换器：

Color color = Color.red;
float [] hsb = Color.RGBtoHSB(color.getRed(), color.getGreen(), color.getBlue(), null);

或

Color color = Color.red;
float [] hsb = new float[3];
Color.RGBtoHSB(color.getRed(), color.getGreen(), color.getBlue(), hsb);

返回的值介于 0 和 1 之间。因此您可能希望将它们乘以 360 以使其适合您的程序模型。

Javadoc for RGBtoHSB