157 lines
6.2 KiB
Java
157 lines
6.2 KiB
Java
|
Color chooser applet.html
|
||
|
|
|
||
|
|
import java.awt.*;
|
||
|
|
import java.awt.event.*;
|
||
|
|
import java.applet.*;
|
||
|
|
|
||
|
|
public class ColorChooserApplet extends Applet implements AdjustmentListener {
|
||
|
|
|
||
|
|
private float[] hsb = new float[3]; // For holding HSB color components.
|
||
|
|
|
||
|
|
private int r = 0, g = 0, b = 0; // The RGB color components.
|
||
|
|
|
||
|
|
private Scrollbar hueScroll, brightnessScroll, saturationScroll, // Scroll bars.
|
||
|
|
redScroll, greenScroll, blueScroll;
|
||
|
|
|
||
|
|
private Label hueLabel, brightnessLabel, saturationLabel, // Display component values.
|
||
|
|
redLabel, greenLabel, blueLabel;
|
||
|
|
|
||
|
|
private Canvas colorCanvas; // Color patch for displaying the color.
|
||
|
|
|
||
|
|
public void init() {
|
||
|
|
|
||
|
|
Color.RGBtoHSB(0,0,0,hsb); // Get HSB equivalent of RGB = (0,0,0);
|
||
|
|
|
||
|
|
/* Create Scrollbars with possible values from 0 to 255. */
|
||
|
|
|
||
|
|
hueScroll = new Scrollbar(Scrollbar.HORIZONTAL, (int)(255*hsb[0]), 10, 0, 265);
|
||
|
|
saturationScroll = new Scrollbar(Scrollbar.HORIZONTAL, (int)(255*hsb[1]), 10, 0, 265);
|
||
|
|
brightnessScroll = new Scrollbar(Scrollbar.HORIZONTAL, (int)(255*hsb[2]), 10, 0, 265);
|
||
|
|
redScroll = new Scrollbar(Scrollbar.HORIZONTAL, 0, 10, 0, 265);
|
||
|
|
greenScroll = new Scrollbar(Scrollbar.HORIZONTAL, 0, 10, 0, 265);
|
||
|
|
blueScroll = new Scrollbar(Scrollbar.HORIZONTAL, 0, 10, 0, 265);
|
||
|
|
|
||
|
|
/* Create Labels showing current RGB and HSB values. */
|
||
|
|
|
||
|
|
hueLabel = new Label(" H = " + hsb[0]);
|
||
|
|
saturationLabel = new Label(" S = " + hsb[1]);
|
||
|
|
brightnessLabel = new Label(" B = " + hsb[2]);
|
||
|
|
redLabel = new Label(" R = 0");
|
||
|
|
greenLabel = new Label(" G = 0");
|
||
|
|
blueLabel = new Label(" B = 0");
|
||
|
|
|
||
|
|
/* Set background colors for Scrollbars and Labels, so they don't
|
||
|
|
inherit the gray background of the applet. */
|
||
|
|
|
||
|
|
hueScroll.setBackground(Color.lightGray);
|
||
|
|
saturationScroll.setBackground(Color.lightGray);
|
||
|
|
brightnessScroll.setBackground(Color.lightGray);
|
||
|
|
redScroll.setBackground(Color.lightGray);
|
||
|
|
greenScroll.setBackground(Color.lightGray);
|
||
|
|
blueScroll.setBackground(Color.lightGray);
|
||
|
|
|
||
|
|
hueLabel.setBackground(Color.white);
|
||
|
|
saturationLabel.setBackground(Color.white);
|
||
|
|
brightnessLabel.setBackground(Color.white);
|
||
|
|
redLabel.setBackground(Color.white);
|
||
|
|
greenLabel.setBackground(Color.white);
|
||
|
|
blueLabel.setBackground(Color.white);
|
||
|
|
|
||
|
|
/* Set the applet to listen for changes to the Scrollbars' values */
|
||
|
|
|
||
|
|
hueScroll.addAdjustmentListener(this);
|
||
|
|
saturationScroll.addAdjustmentListener(this);
|
||
|
|
brightnessScroll.addAdjustmentListener(this);
|
||
|
|
redScroll.addAdjustmentListener(this);
|
||
|
|
greenScroll.addAdjustmentListener(this);
|
||
|
|
blueScroll.addAdjustmentListener(this);
|
||
|
|
|
||
|
|
/* Create a canvas whose background color will always be set to the
|
||
|
|
currently selected color. */
|
||
|
|
|
||
|
|
colorCanvas = new Canvas();
|
||
|
|
colorCanvas.setBackground(Color.black);
|
||
|
|
|
||
|
|
/* Create the applet format, which consists of a row of
|
||
|
|
three equal-sized regions holding the Scrollbars,
|
||
|
|
the Labels, and the color patch. The background color
|
||
|
|
of the applet is gray, which will show around the edges
|
||
|
|
and between components. */
|
||
|
|
|
||
|
|
setLayout(new GridLayout(1,3,3,3));
|
||
|
|
setBackground(Color.gray);
|
||
|
|
Panel scrolls = new Panel();
|
||
|
|
Panel labels = new Panel();
|
||
|
|
add(scrolls);
|
||
|
|
add(labels);
|
||
|
|
add(colorCanvas);
|
||
|
|
|
||
|
|
/* Add the Scrollbars and the Labels to their respective panels. */
|
||
|
|
|
||
|
|
scrolls.setLayout(new GridLayout(6,1,2,2));
|
||
|
|
scrolls.add(redScroll);
|
||
|
|
scrolls.add(greenScroll);
|
||
|
|
scrolls.add(blueScroll);
|
||
|
|
scrolls.add(hueScroll);
|
||
|
|
scrolls.add(saturationScroll);
|
||
|
|
scrolls.add(brightnessScroll);
|
||
|
|
|
||
|
|
labels.setLayout(new GridLayout(6,1,2,2));
|
||
|
|
labels.add(redLabel);
|
||
|
|
labels.add(greenLabel);
|
||
|
|
labels.add(blueLabel);
|
||
|
|
labels.add(hueLabel);
|
||
|
|
labels.add(saturationLabel);
|
||
|
|
labels.add(brightnessLabel);
|
||
|
|
|
||
|
|
} // end init();
|
||
|
|
|
||
|
|
|
||
|
|
public void adjustmentValueChanged(AdjustmentEvent evt) {
|
||
|
|
// This is called when the user has changed the values on
|
||
|
|
// one of the scrollbars. All the scrollbars and labels
|
||
|
|
// and the color patch are reset to correspond to the new color.
|
||
|
|
int r1, g1, b1;
|
||
|
|
r1 = redScroll.getValue();
|
||
|
|
g1 = greenScroll.getValue();
|
||
|
|
b1 = blueScroll.getValue();
|
||
|
|
if (r != r1 || g != g1 || b != b1) { // One of the RGB components has changed.
|
||
|
|
r = r1;
|
||
|
|
g = g1;
|
||
|
|
b = b1;
|
||
|
|
Color.RGBtoHSB(r,g,b,hsb);
|
||
|
|
}
|
||
|
|
else { // One of the HSB components has changed.
|
||
|
|
hsb[0] = hueScroll.getValue()/255.0F;
|
||
|
|
hsb[1] = saturationScroll.getValue()/255.0F;
|
||
|
|
hsb[2] = brightnessScroll.getValue()/255.0F;
|
||
|
|
int rgb = Color.HSBtoRGB(hsb[0],hsb[1],hsb[2]);
|
||
|
|
r = (rgb >> 16) & 0xFF;
|
||
|
|
g = (rgb >> 8) & 0xFF;
|
||
|
|
b = rgb & 0xFF;
|
||
|
|
}
|
||
|
|
redLabel.setText(" R = " + r);
|
||
|
|
greenLabel.setText(" G = " + g);
|
||
|
|
blueLabel.setText(" B = " + b);
|
||
|
|
hueLabel.setText(" H = " + hsb[0]);
|
||
|
|
saturationLabel.setText(" S = " + hsb[1]);
|
||
|
|
brightnessLabel.setText(" B = " + hsb[2]);
|
||
|
|
redScroll.setValue(r);
|
||
|
|
greenScroll.setValue(g);
|
||
|
|
blueScroll.setValue(b);
|
||
|
|
hueScroll.setValue((int)(255*hsb[0]));
|
||
|
|
saturationScroll.setValue((int)(255*hsb[1]));
|
||
|
|
brightnessScroll.setValue((int)(255*hsb[2]));
|
||
|
|
colorCanvas.setBackground(new Color(r,g,b));
|
||
|
|
colorCanvas.repaint(); // Tell the system to redraw the canvas in its new color.
|
||
|
|
} // end adjustmentValueChanged
|
||
|
|
|
||
|
|
|
||
|
|
public Insets getInsets() {
|
||
|
|
// The system calls this method to find out how much space to
|
||
|
|
// leave between the edges of the applet and the components that
|
||
|
|
// it contains. I want a 3-pixel border at each edge.
|
||
|
|
return new Insets(3,3,3,3);
|
||
|
|
}
|
||
|
|
} // end class ColorChooserApplet
|