Package com.bric.swing

Class ColorPickerPanel

java.lang.Object
java.awt.Component
java.awt.Container
javax.swing.JComponent
javax.swing.JPanel
com.bric.swing.ColorPickerPanel
All Implemented Interfaces:
ImageObserver, MenuContainer, Serializable, Accessible
public class ColorPickerPanel extends JPanel
This is the large graphic element in the ColorPicker that depicts a wide range of colors.

This panel can operate in 6 different modes. In each mode a different property is held constant: hue, saturation, brightness, red, green, or blue. (Each property is identified with a constant in the ColorPicker class, such as: ColorPicker.HUE or ColorPicker.GREEN.)

In saturation and brightness mode, a wheel is used. Although it doesn't use as many pixels as a square does: it is a very aesthetic model since the hue can wrap around in a complete circle. (Also, on top of looks, this is how most people learn to think the color spectrum, so it has that advantage, too). In all other modes a square is used.

The user can click in this panel to select a new color. The selected color is highlighted with a circle drawn around it. Also once this component has the keyboard focus, the user can use the arrow keys to traverse the available colors.

Note this component is public and exists independently of the ColorPicker class. The only way this class is dependent on the ColorPicker class is when the constants for the modes are used.

The graphic in this panel will be based on either the width or the height of this component: depending on which is smaller.

See Also:

  • Field Details

    • MAX_SIZE

      public static final int MAX_SIZE
      The maximum size the graphic will be. No matter how big the panel becomes, the graphic will not exceed this length.

      (This is enforced because only 1 BufferedImage is used to render the graphic. This image is created once at a fixed size and is never replaced.)

      See Also:

  • Constructor Details

    • ColorPickerPanel

      public ColorPickerPanel()
      Creates a new ColorPickerPanel

  • Method Details

    • addChangeListener

      public void addChangeListener(ChangeListener l)
      This listener will be notified when the current HSB or RGB values change.

    • removeChangeListener

      public void removeChangeListener(ChangeListener l)
      Remove a ChangeListener so it is no longer notified when the selected color changes.

    • fireChangeListeners

      protected void fireChangeListeners()

    • paint

      public void paint(Graphics g)
      Overrides:
      paint in class JComponent

    • setMode

      public void setMode(int mode)
      Set the mode of this panel.
      Parameters:
      mode - This must be one of the following constants from the ColorPicker class: HUE, SAT, BRI, RED, GREEN, or BLUE

    • setRGB

      public void setRGB(int r, int g, int b)
      Sets the selected color of this panel.

      If this panel is in HUE, SAT, or BRI mode, then this method converts these values to HSB coordinates and calls setHSB.

      This method may regenerate the graphic if necessary.

      Parameters:
      r - the red value of the selected color.
      g - the green value of the selected color.
      b - the blue value of the selected color.

    • getHSB

      public float[] getHSB()
      Returns:
      the HSB values of the selected color. Each value is between [0,1].

    • getRGB

      public int[] getRGB()
      Returns:
      the RGB values of the selected color. Each value is between [0,255].

    • getHSB

      public float[] getHSB(Point p)
      Returns the color at the indicated point in HSB values.
      Parameters:
      p - a point relative to this panel.
      Returns:
      the HSB values at the point provided.

    • getRGB

      public int[] getRGB(Point p)
      Returns the color at the indicated point in RGB values.
      Parameters:
      p - a point relative to this panel.
      Returns:
      the RGB values at the point provided.

    • setHSB

      public void setHSB(float h, float s, float b)
      Sets the selected color of this panel.

      If this panel is in RED, GREEN, or BLUE mode, then this method converts these values to RGB coordinates and calls setRGB.

      This method may regenerate the graphic if necessary.

      Parameters:
      h - the hue value of the selected color.
      s - the saturation value of the selected color.
      b - the brightness value of the selected color.