File	Doc	Category	Size	Date	Package
ColorChooser.java	API Doc	J2ME MIDP 2.0	11139	Thu Nov 07 12:02:16 GMT 2002	example.chooser

ColorChooser

• java.lang.Object
  • Canvas

Fields Summary
private int	width
private int	height
private Font	font
private int	label_w
private int	label_h
private int	gray
private int	rgbColor
private int	radix
private int	delta
private int	ndx
private boolean	isColor
private int	numColors
private int	pndx
private int[]	palette
static final int	BORDER

Constructors Summary

public ColorChooser(boolean isColor, int numColors) this.isColor = isColor; this.numColors = numColors; ndx = 0; pndx = 0; setColor(palette[pndx]); width = getWidth(); height = getHeight(); font = Font.getDefaultFont(); label_h = font.getHeight(); if (label_h > (height / 6)) { font = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_SMALL); label_h = font.getHeight(); } label_w = font.stringWidth("999");

Methods Summary
private void	colorPaint(Graphics g) // Scale palette cells to fit 10 across int p_w = width / palette.length; int p_h = (height - (BORDER*3)) / 4; int usable_w = p_w * palette.length; int sample_w = p_w * palette.length - 1; int sample_h = p_h; int sample_x = (width - usable_w) / 2; int sample_y = 0; int p_x = sample_x; int p_y = sample_y + sample_h + 4; // Fill the background g.setColor(0xffffff); g.fillRect(0, 0, width, height); // Fill in the color sample g.setColor(rgbColor); gray = g.getGrayScale(); g.fillRect(sample_x, sample_y, sample_w, sample_h); g.setColor((ndx < 0) ? 0x000000 : 0x808080); g.drawRect(sample_x, sample_y, sample_w-1, sample_h-1); // Draw the palette for (int i = 0; i < palette.length; i++) { g.setColor(palette[i]); int shift = ((i == pndx) ? BORDER*2 : 0); g.fillRect(p_x + i*p_w, p_y-shift, p_w-1, p_h); // If the palette is selected, outline it if (i == pndx) { g.setColor((ndx < 0) ? 0x000000 : 0x808080); g.drawRect(p_x + i*p_w, p_y-shift-1, p_w-2, p_h+1); } } int bars_x = sample_x; int bars_y = p_y + p_h + BORDER; int bar_h = label_h + BORDER; int bar_w = usable_w - label_w - BORDER; int b_x = label_w + BORDER; int b_y = bars_y + BORDER; int g_y = b_y + bar_h; int r_y = g_y + bar_h; // Draw the colorbars g.setColor(0, 0, 255); int b_w = (bar_w * getBlueComponent()) / 255; g.fillRect(b_x, b_y, b_w, bar_h - BORDER); g.setColor((ndx == 0) ? 0x000000 : 0xa0ffa0); g.drawRect(b_x, b_y, bar_w - 1, bar_h - BORDER - 1); int g_w = (bar_w * getGreenComponent()) / 255; g.setColor(0, 255, 0); g.fillRect(b_x, g_y, g_w, bar_h - BORDER); g.setColor((ndx == 1) ? 0x000000 : 0xa0ffa0); g.drawRect(b_x, g_y, bar_w - 1, bar_h - BORDER - 1); int r_w = (bar_w * getRedComponent()) / 255; g.setColor(255, 0, 0); g.fillRect(b_x, r_y, r_w, bar_h - BORDER); g.setColor((ndx == 2) ? 0x000000 : 0xffa0a0); g.drawRect(b_x, r_y, bar_w - 1, bar_h - BORDER - 1); g.setFont(font); g.setColor(0, 0, 0); g.drawString(format(getBlueComponent()), label_w, b_y+bar_h, Graphics.BOTTOM|Graphics.RIGHT); g.drawString(format(getGreenComponent()), label_w, g_y+bar_h, Graphics.BOTTOM|Graphics.RIGHT); g.drawString(format(getRedComponent()), label_w, r_y+bar_h, Graphics.BOTTOM|Graphics.RIGHT);
private java.lang.String	format(int num) String s = Integer.toString(num, radix); if (radix == 10 || s.length() >= 2) return s; return "0" + s;
public int	getBlueComponent() Gets the blue component of the current color. return integer value in range 0-255 see #setColor(int, int, int) return rgbColor & 0xff;
public int	getColor() Gets the current color. return an integer in form 0x00RRGGBB see #setColor(int, int, int) return rgbColor;
public int	getDelta() Get the delta used to increment/decrement. return delta;
public int	getGrayScale() return gray;
public int	getGreenComponent() Gets the green component of the current color. return integer value in range 0-255 see #setColor(int, int, int) return (rgbColor >> 8) & 0xff;
public int	getPaletteIndex() Get the current palette index. return the current index in the palette. return ndx;
public int	getRadix() Get the radix used to display numbers. return radix;
public int	getRedComponent() Gets the red component of the current color. return integer value in range 0-255 see #setColor(int, int, int) return (rgbColor >> 16) & 0xff;
private void	grayPaint(Graphics g) int sample_w = width; int sample_h = height / 2; int g_y = height / 2; int g_w = width - (label_w + BORDER); int g_h = label_h + BORDER; // Fill the background g.setGrayScale(0xff); g.fillRect(0, 0, width, height); // Fill in the gray sample g.setGrayScale(gray); g.fillRect(0, 0, sample_w, sample_h); g.setGrayScale(0); g.drawRect(0, 0, sample_w-1, sample_h-1); // Fill in the gray bar g.setGrayScale(0); g.fillRect(label_w+BORDER, g_y + BORDER, (g_w * gray) / 255, g_h); g.drawRect(label_w+BORDER, g_y + BORDER, g_w-1, g_h-1); g.drawString(format(gray), label_w, g_y+BORDER + g_h, Graphics.BOTTOM|Graphics.RIGHT);
protected void	keyPressed(int key) 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 } // Gray scale event handling is simpler than color if (isColor) { // Limit selection to r,g,b and palette if (ndx < -1) ndx = -1; if (ndx > 2) ndx = 2; if (ndx >= 0) { int v = (rgbColor >> (ndx*8)) & 0xff; v += dir * delta; if (v < 0) v = 0; if (v > 255) v = 255; int mask = 0xff << (ndx*8); rgbColor = (rgbColor & ~mask) | v << (ndx*8); palette[pndx] = rgbColor; } else { pndx += dir; if (pndx < 0) pndx = 0; if (pndx >= palette.length) pndx = palette.length-1; rgbColor = palette[pndx]; } } else { /* * Gray scale; multiple dir and add to gray * ignore (up/down) there is only one thing to select. */ gray += dir * delta; if (gray < 0) gray = 0; if (gray > 255) gray = 255; } repaint();
public void	keyRepeated(int key) keyPressed(key);
protected void	paint(Graphics g) if (isColor) { colorPaint(g); } else { grayPaint(g); }
public void	setColor(int red, int green, int blue) Sets the current color to the specified RGB values. param red The red component of the color being set in range 0-255. param green The green component of the color being set in range 0-255. param blue The blue component of the color being set in range 0-255. red = (red < 0) ? 0 : (red & 0xff); green = (green < 0) ? 0 : (green & 0xff); blue = (blue < 0) ? 0 : (blue & 0xff); setColor((red << 16) | (green << 8) | blue);
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; palette[pndx] = rgbColor; updateGray();
public void	setDelta(int delta) Set the delta used to increment/decrement. The default is 32. if (delta > 0 && delta <= 128) { this.delta = delta; }
public void	setGrayScale(int value) Sets the current grayscale. For color the value is used to set each component. param the value in range 0-255 setColor(value, value, value);
public boolean	setPaletteIndex(int index) Select which entry in the Palette to use for the current color. param index index into the palette; 0..10. if (index >= palette.length) return false; pndx = index; setColor(palette[index]); return true;
public void	setRadix(int rad) Set the radix used to display numbers. The default is decimal (10). if (rad != 10 && rad != 16) { throw new IllegalArgumentException(); } radix = rad; repaint();
protected void	showNotify() The canvas is being displayed. Compute the relative placement of items the depend on the screen size.
private void	updateGray() /* * REMIND: change this, if the spec allows it * * Gray is the value according to HSV. I think it would * make more sense to use NTSC gray, but that's not what * is currently in the spec. -- rib 20 Mar 2000 */ gray = Math.max((rgbColor >> 16) & 0xff, Math.max((rgbColor >> 8) & 0xff, rgbColor & 0xff));