在图形中更改图片的色调

Question

好的，所以我需要帮助改变这个滑块的色调。我似乎无法弄明白。请不要@override。我需要一些可以在Ready to Program上运行的东西。当滑块返回0时，色调将恢复正常。我不需要太复杂。只需一个简单的Hue滑块就可以了。谢谢！

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.applet.Applet;
import javax.swing.event.*;
import java.applet.*;

public class test extends Applet implements ActionListener, ChangeListener
{

    //Widgets, Panels
    JSlider slider;
    Panel flow;
    int colorr;
    int colorg;
    int colorb;
    int stars;
    //House Coordinates, initialized to 1. (Top Right and No Scaling)


    public void init ()
    { //Set Up Input Fields for House Coordinates
        resize (380, 240);
        setBackground (new Color (102, 179, 255));

        slider = new JSlider ();
        slider.setValue (0);
        slider.setBackground (new Color (102, 179, 255));
        slider.setForeground (Color.white);
        slider.setMajorTickSpacing (20);
        slider.setMinorTickSpacing (5);
        slider.setPaintTicks (true);
        slider.addChangeListener (this);


        //Set up layout, add widgets
        setLayout (new BorderLayout ());
        flow = new Panel (new FlowLayout ());
        flow.add (slider);
        add (flow, "South");

    }


    public void paint (Graphics g)
    {
        Graphics2D g2d = (Graphics2D) g;
        Color color1 = getBackground ();
        Color color2 = color1.darker ();
        int x = getWidth ();
        int y = getHeight () - 30;
        GradientPaint gp = new GradientPaint (
                0, 0, color1,
                0, y, color2);

        g2d.setPaint (gp);
        g2d.fillRect (0, 0, x, y);

        stars (10, 10);
    }


    public void stars (int x, int y)
    {
        Graphics g = getGraphics ();

        //sun
        g.setColor (new Color (139, 166, 211));
        g.fillOval (-200, 170, 1000, 400);

        g.setColor (new Color (206, 75, 239));
        g.fillOval (x, y, 10, 10);                      //First medium star
        g.drawLine (x + 5, y, x + 5, 0);
        g.drawLine (x, y + 5, 0, y + 5);
        g.drawLine (x + 5, y + 10, x + 5, y + 20);
        g.drawLine (x + 10, y + 5, x + 20, y + 5);

        g.fillOval (x + 80, y + 30, 12, 12);            //Middle medium star
        g.drawLine (x + 86, y + 30, x + 86, y + 18);
        g.drawLine (x + 80, y + 36, x + 68, y + 36);
        g.drawLine (x + 92, y + 36, x + 104, y + 36);
        g.drawLine (x + 86, y + 42, x + 86, y + 52);

        colorr = (int) (Math.random () * 255) + 1;
        colorg = (int) (Math.random () * 255) + 1;
        colorb = (int) (Math.random () * 255) + 1;
        int randomx = (int) (Math.random () * 300) + 10;
        int randomy = (int) (Math.random () * 150) + 10;

        stars = 50; //Change for more stars

        int ax[] = new int [stars];
        int ay[] = new int [stars];

        for (int i = 0 ; i < stars ; i++)
        {
            g.setColor (new Color (colorr, colorg, colorb));
            colorr = (int) (Math.random () * 255) + 1;
            colorg = (int) (Math.random () * 255) + 1;
            colorb = (int) (Math.random () * 255) + 1;

            while ((randomx > 88 && randomx < 116) && (randomy < 65 && randomy > 15))
            {
                randomx = (int) (Math.random () * 300) + 10;
                randomy = (int) (Math.random () * 150) + 10;
            }

            while ((randomx > 0 && randomx < 25) && (randomy > 5 && randomy < 35))
            {
                randomx = (int) (Math.random () * 300) + 10;
                randomy = (int) (Math.random () * 150) + 10;
            }
            g.drawOval (randomx, randomy, 5, 5);
            randomx = (int) (Math.random () * 300) + 10;
            randomy = (int) (Math.random () * 150) + 10;
        }

        g.setColor (Color.white);
        g.drawLine (320, 0, 315, 40);
        g.drawLine (320, 0, 325, 40);
        g.drawLine (320, 120, 315, 80);
        g.drawLine (320, 120, 325, 80);
        g.drawLine (260, 60, 300, 55);
        g.drawLine (260, 60, 300, 65);
        g.drawLine (380, 60, 340, 55);
        g.drawLine (380, 60, 340, 65);
        fillGradOval (280, 20, 80, 80, new Color (254, 238, 44), new Color (255, 251, 191), g);

        g.setColor (new Color (255, 251, 191));
        fillGradOval (300, 40, 40, 40, new Color (255, 251, 191), new Color (254, 238, 44), g);
    }


    public void fillGradOval (int X, int Y, int H2, int W2, Color c1, Color c2, Graphics g)
    {
        g.setColor (c1);
        g.fillOval (X, Y, W2, H2);
        Color Gradient = c1;
        float red = (c2.getRed () - c1.getRed ()) / (W2 / 2);
        float blue = (c2.getBlue () - c1.getBlue ()) / (W2 / 2);
        float green = (c2.getGreen () - c1.getGreen ()) / (W2 / 2);

        int scale = 1;
        int r = c1.getRed ();
        int gr = c1.getGreen ();
        int b = c1.getBlue ();

        while (W2 > 10)
        {
            r = (int) (r + red);
            gr = (int) (gr + green);
            b = (int) (b + blue);

            Gradient = new Color (r, gr, b);
            g.setColor (Gradient);

            W2 = W2 - 2 * scale;
            H2 = H2 - 2 * scale;
            X = X + scale;
            Y = Y + scale;

            g.fillOval (X, Y, W2, H2);
        }
    }


    public void actionPerformed (ActionEvent e)
    {

    }


    public void stateChanged (ChangeEvent e)
    {
        JSlider source = (JSlider) e.getSource ();
        if (!source.getValueIsAdjusting ())
        {

        }
    }
}

Answer 1

我不确定你指的是什么'颜色'，所以我做了一些猜测。这是一个混合应用程序/ applet（更容易开发和测试），它将底部面板的颜色以及渐变颜色的底部颜色链接到使用滑块定义的色调。

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

/* <applet code=HueSlider width=380 height=240></applet> */
public class HueSlider extends JApplet
{
    public void init() {
        add(new HueSliderGui());
    }

    public static void main(String[] args) {
        Runnable r = new Runnable() {
            @Override
            public void run() {
                HueSliderGui hsg = new HueSliderGui();
                JOptionPane.showMessageDialog(null, hsg);
            }
        };
        SwingUtilities.invokeLater(r);
    }
}

class HueSliderGui extends JPanel implements ChangeListener {

    //Widgets, Panels
    JSlider slider;
    JPanel flow;
    int colorr;
    int colorg;
    int colorb;
    Color bg = new Color (102, 179, 255);
    int stars;
    //House Coordinates, initialized to 1. (Top Right and No Scaling)
    Dimension prefSize = new Dimension(380, 240);

    HueSliderGui() {
        initGui();
    }

    public void initGui()
    {
        //Set Up Input Fields for House Coordinates
        // an applet size is set in HTML
        //resize (380, 240);
        setBackground (bg);

        slider = new JSlider ();
        slider.setValue (0);
        slider.setBackground (new Color (102, 179, 255));
        slider.setForeground (Color.white);
        slider.setMajorTickSpacing (20);
        slider.setMinorTickSpacing (5);
        slider.setPaintTicks (true);
        slider.addChangeListener (this);


        //Set up layout, add widgets
        setLayout (new BorderLayout ());
        flow = new JPanel (new FlowLayout ());
        flow.add (slider);
        add (flow, "South");
        validate();
    }

    @Override
    public Dimension getPreferredSize() {
        return prefSize;
    }


    @Override
    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g;
        Color color1 = getBackground ();
        Color color2 = color1.darker ();
        int x = getWidth ();
        int y = getHeight () - 30;
        GradientPaint gp = new GradientPaint (
                0, 0, color1,
                0, y, flow.getBackground());

        g2d.setPaint (gp);
        g2d.fillRect (0, 0, x, y);

        stars (10, 10, g2d);
    }

    public void stars (int x, int y, Graphics g)
    {
//        Graphics g = getGraphics ();  we should never call getGraphics

        //sun
        g.setColor (new Color (139, 166, 211));
        g.fillOval (-200, 170, 1000, 400);

        g.setColor (new Color (206, 75, 239));
        g.fillOval (x, y, 10, 10);                      //First medium star
        g.drawLine (x + 5, y, x + 5, 0);
        g.drawLine (x, y + 5, 0, y + 5);
        g.drawLine (x + 5, y + 10, x + 5, y + 20);
        g.drawLine (x + 10, y + 5, x + 20, y + 5);

        g.fillOval (x + 80, y + 30, 12, 12);            //Middle medium star
        g.drawLine (x + 86, y + 30, x + 86, y + 18);
        g.drawLine (x + 80, y + 36, x + 68, y + 36);
        g.drawLine (x + 92, y + 36, x + 104, y + 36);
        g.drawLine (x + 86, y + 42, x + 86, y + 52);

        colorr = (int) (Math.random () * 255) + 1;
        colorg = (int) (Math.random () * 255) + 1;
        colorb = (int) (Math.random () * 255) + 1;
        int randomx = (int) (Math.random () * 300) + 10;
        int randomy = (int) (Math.random () * 150) + 10;

        stars = 50; //Change for more stars

        int ax[] = new int [stars];
        int ay[] = new int [stars];

        for (int i = 0 ; i < stars ; i++)
        {
            g.setColor (new Color (colorr, colorg, colorb));
            colorr = (int) (Math.random () * 255) + 1;
            colorg = (int) (Math.random () * 255) + 1;
            colorb = (int) (Math.random () * 255) + 1;

            while ((randomx > 88 && randomx < 116) && (randomy < 65 && randomy > 15))
            {
                randomx = (int) (Math.random () * 300) + 10;
                randomy = (int) (Math.random () * 150) + 10;
            }

            while ((randomx > 0 && randomx < 25) && (randomy > 5 && randomy < 35))
            {
                randomx = (int) (Math.random () * 300) + 10;
                randomy = (int) (Math.random () * 150) + 10;
            }
            g.drawOval (randomx, randomy, 5, 5);
            randomx = (int) (Math.random () * 300) + 10;
            randomy = (int) (Math.random () * 150) + 10;
        }

        g.setColor (Color.white);
        g.drawLine (320, 0, 315, 40);
        g.drawLine (320, 0, 325, 40);
        g.drawLine (320, 120, 315, 80);
        g.drawLine (320, 120, 325, 80);
        g.drawLine (260, 60, 300, 55);
        g.drawLine (260, 60, 300, 65);
        g.drawLine (380, 60, 340, 55);
        g.drawLine (380, 60, 340, 65);
        fillGradOval (280, 20, 80, 80, new Color (254, 238, 44), new Color (255, 251, 191), g);

        g.setColor (new Color (255, 251, 191));
        fillGradOval (300, 40, 40, 40, new Color (255, 251, 191), new Color (254, 238, 44), g);
    }

    public void fillGradOval (int X, int Y, int H2, int W2, Color c1, Color c2, Graphics g)
    {
        g.setColor (c1);
        g.fillOval (X, Y, W2, H2);
        Color Gradient = c1;
        float red = (c2.getRed () - c1.getRed ()) / (W2 / 2);
        float blue = (c2.getBlue () - c1.getBlue ()) / (W2 / 2);
        float green = (c2.getGreen () - c1.getGreen ()) / (W2 / 2);

        int scale = 1;
        int r = c1.getRed ();
        int gr = c1.getGreen ();
        int b = c1.getBlue ();

        while (W2 > 10)
        {
            r = (int) (r + red);
            gr = (int) (gr + green);
            b = (int) (b + blue);

            Gradient = new Color (r, gr, b);
            g.setColor (Gradient);

            W2 = W2 - 2 * scale;
            H2 = H2 - 2 * scale;
            X = X + scale;
            Y = Y + scale;

            g.fillOval (X, Y, W2, H2);
        }
    }

    public void stateChanged (ChangeEvent e)
    {
        JSlider source = (JSlider) e.getSource ();
        if (!source.getValueIsAdjusting ())
        {
            int i = source.getValue();
            System.out.println(i);
            float[] hsb = Color.RGBtoHSB(bg.getRed(),bg.getGreen(),bg.getBlue(),null);
            int colorHue = Color.HSBtoRGB((float)i/100f, hsb[1], hsb[2]);
            Color c = new Color(colorHue);
            flow.setBackground(c);
            this.repaint();
        }
    }
}