File	Doc	Category	Size	Date	Package
MiniColorChooser.java	API Doc	J2ME MIDP 2.0	3851	Thu Nov 07 12:02:16 GMT 2002	example.chooser

MiniColorChooser

• java.lang.Object
  • Canvas

Fields Summary
int	rgbColor current color
int	ndx current index
static final int	BORDER Border width
static final int	BAR_H Color bar height

Constructors Summary
public MiniColorChooser() Create a new MiniColorChooser for a single color. setColor(0xffff00);

Methods Summary
public int	getColor() Gets the current color. return an integer in form 0x00RRGGBB see #setColor return rgbColor;
protected void	keyPressed(int key) Left and Right are used to change which color bar to change Up and Down are used to increase/decrease the value of that bar. param key was pressed int action = getGameAction(key); int dir = 0; switch (action) { case RIGHT: dir += 1; break; case LEFT: dir -= 1; break; case UP: ndx -= 1; break; case DOWN: ndx += 1; break; default: return; // nothing we recognize, exit } // Limit selection to r,g,b and palette if (ndx < 0) ndx = 0; if (ndx > 2) ndx = 2; if (ndx >= 0) { int v = (rgbColor >> (ndx*8)) & 0xff; v += dir * 0x20; if (v < 0) v = 0; if (v > 255) v = 255; int mask = 0xff << (ndx*8); rgbColor = (rgbColor & ~mask) | v << (ndx*8); } repaint();
public void	keyRepeated(int key) Handle repeat as in pressed. param key was pressed keyPressed(key);
protected void	paint(Graphics g) Paint the canvas with the current color and controls to change it. param g the graphics context to draw to the screen. int w = getWidth(); int h = getHeight(); int sample_w = w - 1; int sample_h = h - (BAR_H + BORDER) * 3; int sample_y = BORDER; int b_y = sample_y + sample_h + BORDER*2; int g_y = b_y + BAR_H; int r_y = g_y + BAR_H; // Fill the background g.setColor(0x000000); g.fillRect(0, 0, w, h); // Fill in the color sample g.setColor(rgbColor); g.fillRect(BORDER, sample_y, sample_w, sample_h); // Draw the colorbars int blue = (rgbColor >> 0) & 0xff; g.setColor(0, 0, 255); g.fillRect(20, b_y, blue / 4, 10); int green = (rgbColor >> 8) & 0xff; g.setColor(0, 255, 0); g.fillRect(20, g_y, green / 4, 10); int red = (rgbColor >> 16) & 0xff; g.setColor(255, 0, 0); g.fillRect(20, r_y, red / 4, 10); g.setColor(255, 255, 255); g.drawString(Integer.toString(blue), 18, b_y-3, Graphics.RIGHT|Graphics.TOP); g.drawString(Integer.toString(green), 18, g_y-3, Graphics.RIGHT|Graphics.TOP); g.drawString(Integer.toString(red), 18, r_y-3, Graphics.RIGHT|Graphics.TOP); if (ndx >= 0) { int y = b_y + ndx * BAR_H; g.drawRect(20, y, 63, 10); }
public void	setColor(int RGB) Sets the current color to the specified RGB values. All subsequent rendering operations will use this specified color. The RGB value passed in is interpreted with the least significant eight bits giving the blue component, the next eight more significant bits giving the green component, and the next eight more significant bits giving the red component. That is to say, the color component is specified like 0x00RRGGBB. param RGB The color being set. rgbColor = RGB & 0x00ffffff;