import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
 
public class ColourPickerMouse extends Applet implements MouseListener {
    Image rgbImageCanvas;                   // 
    Image rgbImageBar;                      // 
    int pixels[] = new int[0x10000];        // 
    int pixels2[] = new int[2560];          // 
    Color viewColor = Color.red;            // Default colour at start
    int rgbXSelect1;                        // Selecting bounds for x axis on Canvas
    int rgbYSelect1;                        // Selecting bounds for y axis on Canvas
    int rgbYSelect2;                        // Selecting bounds for y axis on Bar
    Label labelSample;                      // Label for sample colour square
    Label labelHex;                         // Label for Hex value
    TextField textFieldHex;                 // TextField for Hex value
    Label labelRGBValue;                    // Label for RGB value of Blue
    Label labelR;                           // Label for RGB value of Blue
    Label labelG;                           // Label for RGB value of Blue
    Label labelB;                           // Label for RGB value of Blue
    TextField textFieldB;                   // TextField for RGB value of Blue
    TextField textFieldR;                   // TextField for RGB value of Red
    TextField textFieldG;                   // TextField for RGB value of Green
    int x,y;
 
    public void init() {
        MakeImageCanvas();
        MakeImageBar();
        setLayout(null);
        labelSample = new Label("Selected Colour:");
        labelSample.setBounds(312, 12, 100, 10);
        add(labelSample);
        labelHex = new Label("Hex Value:");
        labelHex.setBounds(312, 80, 84, 24);
        add(labelHex);
        textFieldHex = new TextField();
        textFieldHex.setBounds(312, 110, 80, 20);
        textFieldHex.setEditable(false);
        add(textFieldHex);
        labelRGBValue = new Label("RGB Values:");
        labelRGBValue.setBounds(312, 150, 84, 24);
        add(labelRGBValue);
        labelR = new Label("Red:");
        labelR.setBounds(312, 178, 36, 20);
        add(labelR);
        textFieldR = new TextField();
        textFieldR.setBounds(360, 178, 45, 20);
        textFieldR.setEditable(false);
        add(textFieldR);
        labelG = new Label("Green:");
        labelG.setBounds(312, 202, 40, 20);
        add(labelG);
        textFieldG = new TextField();
        textFieldG.setBounds(360, 202, 45, 20);
        textFieldG.setEditable(false);
        add(textFieldG);
        labelB = new Label("Blue:");
        labelB.setBounds(312, 226, 40, 20);
        add(labelB);
        textFieldB = new TextField();
        textFieldB.setBounds(360, 226, 45, 20);
        textFieldB.setEditable(false);
        add(textFieldB);
        addMouseListener(this);
    }
    
    public void mouseMoved (MouseEvent e) {}
    public void mouseDragged (MouseEvent e) {}
    public void mouseReleased (MouseEvent e) {}
    public void mouseClicked (MouseEvent e) {}
    public void mouseEntered (MouseEvent e) {}
    public void mouseExited (MouseEvent e) {}
    public void mousePressed (MouseEvent e) {}
 
    public void processMouseEvent(MouseEvent event) {
        event.getX();
        event.getY();
        if (x >= 8 && y >= 8 && x <= 269 && y <= 269) {
            rgbXSelect1 = Math.max(0, Math.min(255, x - 10));
            rgbYSelect1 = Math.max(0, Math.min(255, y - 10));
            Graphics g = getGraphics();
            DrawBackground(g);
            DrawSelector(g);
        } else
        if (x >= 275 && y >= 8 && x <= 286 && y <= 263) {
            rgbYSelect2 = Math.max(0, Math.min(255, y - 10));
            viewColor = new Color(pixels2[rgbYSelect2 * 10]);
            MakeImageCanvas();
            Graphics g = getGraphics();
            DrawBackground(g);
        } else {
            return false;
        }
        return true;
    }
 
    public void paint(Graphics g) {
        DrawBackground(g);
        DrawSelector(g);
    }
 
    public void DrawBackground(Graphics g) { // Displays for the background of applet
        // If selection is over Canvas area it is covered
        g.setColor(Color.white);
        g.fillRect(5, 5, 266, 5);
        g.fillRect(5, 5, 5, 266);
        g.fillRect(267, 5, 5, 266);
        g.fillRect(5, 267, 266, 5);
        g.setColor(Color.black);
        // Border for Canvas
        g.drawRect(10, 10, 257, 257);
        // Display the colours for Canvas
        g.drawImage(rgbImageCanvas, 11, 11, this);
        // Border for Bar
        g.drawRect(276, 10, 11, 253);
        // Display the colours for Bar
        g.drawImage(rgbImageBar, 277, 11, this);
    }
 
    public void DrawSelector(Graphics g) { //Displays for Canvas, Bar and GUI
        // Selection circles
        g.setColor(Color.white);
        g.drawOval((10 + rgbXSelect1) - 5, (10 + rgbYSelect1) - 5, 11, 11);
        g.setColor(Color.black);
        g.drawOval((10 + rgbXSelect1) - 4, (10 + rgbYSelect1) - 4, 9, 9);
        // Selector on bar
         g.fillRect(274, (10 + rgbYSelect2) - 1, 16, 2);
        // Sample colour square
        int pickColor = pixels[rgbYSelect1 * 256 + rgbXSelect1] & 0xffffff;
        // Draw border
        g.drawRect(321, 35, 37, 37);
        // Get selected colour and fill square
        Color selectedColor = new Color(pickColor);
        g.setColor(selectedColor);
        g.fillRect(322, 36, 36, 36);
        // Textfield information
        textFieldHex.setText("#" + Integer.toHexString(pickColor).toUpperCase());
        textFieldR.setText(Integer.toString(selectedColor.getRed()));
        textFieldG.setText(Integer.toString(selectedColor.getGreen()));
        textFieldB.setText(Integer.toString(selectedColor.getBlue()));
    }
 
    public void FillArray(int pixels[], int counter, int r, int g, int b, int incR, int incG, int incB) { // Array to print colours
        for (int j = 0; j < 256; j += 6) {
            r += incR;
            g += incG;
            b += incB;
            for (int i = 0; i < 10; i++) {
                pixels[counter++] = 0xff000000 | r << 16 | g << 8 | b;
            }
        }
    }
 
    public void MakeImageCanvas() { // Make the colours for the Canvas from array
        int counter = 0;
        double incDestR = (double) ( -viewColor.getRed()) / 256D;
        double incDestG = (double) ( -viewColor.getGreen()) / 256D;
        double incDestB = (double) ( -viewColor.getBlue()) / 256D;
        for (int i = 255; i >= 0; i--) {
            int destR = Math.min(255, Math.max(0, (int) Math.round((double) viewColor.getRed() + (double) (255 - i) * incDestR)));
            int destG = Math.min(255, Math.max(0, (int) Math.round((double) viewColor.getGreen() + (double) (255 - i) * incDestG)));
            int destB = Math.min(255, Math.max(0, (int) Math.round((double) viewColor.getBlue() + (double) (255 - i) * incDestB)));
            double incR = (double) (destR - i) / 256D;
            double incG = (double) (destG - i) / 256D;
            double incB = (double) (destB - i) / 256D;
            for (int j = 0; j < 256; j++) {
                int r = Math.min(255, Math.max(0, (int) Math.floor((double) i + (double) j * incR)));
                int g = Math.min(255, Math.max(0, (int) Math.floor((double) i + (double) j * incG)));
                int b = Math.min(255, Math.max(0, (int) Math.floor((double) i + (double) j * incB)));
                pixels[counter++] = 0xff000000 | r << 16 | g << 8 | b;
            }
        }
        rgbImageCanvas = createImage(new MemoryImageSource(256, 256, pixels, 0, 256));
    }
 
    public void MakeImageBar() { // Make the colours for the Bar from array
        int counter = 0;
        FillArray(pixels2, counter, 255, 0, 0, 0, 6, 0);
        FillArray(pixels2, counter += 420, 255, 255, 0, -6, 0, 0);
        FillArray(pixels2, counter += 420, 0, 255, 0, 0, 0, 6);
        FillArray(pixels2, counter += 420, 0, 255, 255, 0, -6, 0);
        FillArray(pixels2, counter += 420, 0, 0, 255, 6, 0, 0);
        FillArray(pixels2, counter += 420, 255, 0, 255, 0, 0, -6);
        rgbImageBar = createImage(new MemoryImageSource(10, 252, pixels2, 0, 10));
    }
}