lejos.nxt
Class LCD

java.lang.Object
  lejos.nxt.LCD

public class LCD
extends Object

Text and graphics output to the LCD display.

Author:

Andre Nijholt and BB bitBlt and other mods Andy Shaw

Field Summary

static int	CELL_HEIGHT
static int	CELL_WIDTH
static int	DISPLAY_CHAR_DEPTH
static int	DISPLAY_CHAR_WIDTH
static int	DISPLAY_DEPTH
static int	DISPLAY_WIDTH
static int	FONT_HEIGHT
static int	FONT_WIDTH
static int	NOOF_CHARS
static int	ROP_AND
static int	ROP_ANDINVERTED
static int	ROP_ANDREVERSE
static int	ROP_CLEAR Common raster operations for use with bitBlt
static int	ROP_COPY
static int	ROP_COPYINVERTED
static int	ROP_EQUIV
static int	ROP_INVERT
static int	ROP_NAND
static int	ROP_NOOP
static int	ROP_NOR
static int	ROP_OR
static int	ROP_ORINVERTED
static int	ROP_ORREVERSE
static int	ROP_SET
static int	ROP_XOR
static int	SCREEN_HEIGHT
static int	SCREEN_WIDTH

Constructor Summary

LCD()

Method Summary

static void	bitBlt(byte[] src, int sw, int sh, int sx, int sy, byte[] dst, int dw, int dh, int dx, int dy, int w, int h, int rop) Standard two input BitBlt function.
static void	bitBlt(byte[] src, int sw, int sh, int sx, int sy, int dx, int dy, int w, int h, int rop) Standard two input BitBlt function with the LCD display as the destination.
static void	bitBlt(int dx, int dy, int w, int h, int rop) Special case bitBlt with no input image.
static void	clear() Clear the display.
static void	clearDisplay()
static void	drawChar(char c, int x, int y, boolean invert) Draw a single char to an arbitary location on the screen.
static void	drawChar(char c, int x, int y, int rop) Draw a single char to an arbitary location on the screen.
static void	drawInt(int i, int x, int y) Display an int on the LCD at specified x,y co-ordinate.
static void	drawInt(int i, int places, int x, int y) Display an in on the LCD at x,y with leading spaces to occupy at least the number of characters specified by the places parameter.
static void	drawPixels(byte b, int x, int y, boolean invert) Draw pixels a byte at a time.
static void	drawString(String str, int x, int y) Display a string on the LCD at specified x,y co-ordinate.
static void	drawString(String str, int x, int y, boolean invert) Output a string to the display.
static void	drawString(String str, int x, int y, int rop) Output a string to the display.
static byte[]	getDisplay() Provide access to the LCD display frame buffer.
static int	getPixel(int x, int y) Method to get a pixel from the screen.
static byte[]	getSystemFont() Provide access to the LCD system font.
static void	refresh() Update the display.
static void	scroll() Scrolls the screen up one text line
static void	setAutoRefresh(int mode) Turn on/off the automatic refresh of the LCD display.
static void	setDisplay()
static void	setDisplay(int[] buff) Write graphics from a Java buffer to the display.
static void	setPixel(int rgbColor, int x, int y) Method to set a pixel to screen.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

SCREEN_WIDTH

public static final int SCREEN_WIDTH

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Constant Field Values

SCREEN_HEIGHT

public static final int SCREEN_HEIGHT

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DISPLAY_WIDTH

public static final int DISPLAY_WIDTH

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DISPLAY_DEPTH

public static final int DISPLAY_DEPTH

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NOOF_CHARS

public static final int NOOF_CHARS

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FONT_WIDTH

public static final int FONT_WIDTH

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FONT_HEIGHT

public static final int FONT_HEIGHT

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CELL_WIDTH

public static final int CELL_WIDTH

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CELL_HEIGHT

public static final int CELL_HEIGHT

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DISPLAY_CHAR_WIDTH

public static final int DISPLAY_CHAR_WIDTH

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DISPLAY_CHAR_DEPTH

public static final int DISPLAY_CHAR_DEPTH

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ROP_CLEAR

public static final int ROP_CLEAR

Common raster operations for use with bitBlt

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Constant Field Values

ROP_AND

public static final int ROP_AND

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ROP_ANDREVERSE

public static final int ROP_ANDREVERSE

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ROP_COPY

public static final int ROP_COPY

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ROP_ANDINVERTED

public static final int ROP_ANDINVERTED

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ROP_NOOP

public static final int ROP_NOOP

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ROP_XOR

public static final int ROP_XOR

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ROP_OR

public static final int ROP_OR

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ROP_NOR

public static final int ROP_NOR

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ROP_EQUIV

public static final int ROP_EQUIV

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ROP_INVERT

public static final int ROP_INVERT

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ROP_ORREVERSE

public static final int ROP_ORREVERSE

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ROP_COPYINVERTED

public static final int ROP_COPYINVERTED

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ROP_ORINVERTED

public static final int ROP_ORINVERTED

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ROP_NAND

public static final int ROP_NAND

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ROP_SET

public static final int ROP_SET

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Constructor Detail

LCD

public LCD()

Method Detail

bitBlt

public static void bitBlt(byte[] src,
                          int sw,
                          int sh,
                          int sx,
                          int sy,
                          int dx,
                          int dy,
                          int w,
                          int h,
                          int rop)

Standard two input BitBlt function with the LCD display as the destination. Supports standard raster ops and overlapping images. Images are held in native leJOS/Lego format.

Parameters:

src - byte array containing the source image

sw - Width of the source image

sh - Height of the source image

sx - X position to start the copy from

sy - Y Position to start the copy from

dx - X destination

dy - Y destination

w - width of the area to copy

h - height of the area to copy

rop - raster operation.

bitBlt

public static void bitBlt(int dx,
                          int dy,
                          int w,
                          int h,
                          int rop)

Special case bitBlt with no input image. Can be used to clear areas draw rectangles etc.

Parameters:

dx - X destination

dy - Y destination

w - width of the area to copy

h - height of the area to copy

rop - raster operation.

setPixel

public static void setPixel(int rgbColor,
                            int x,
                            int y)

Method to set a pixel to screen.

Parameters:

rgbColor - the pixel color (0 = white, 1 = black)

x - the x coordinate

y - the y coordinate

getPixel

public static int getPixel(int x,
                           int y)

Method to get a pixel from the screen.

Parameters:

x - the x coordinate

y - the y coordinate

Returns:

the pixel color (0 = white, 1 = black)

drawString

public static void drawString(String str,
                              int x,
                              int y,
                              boolean invert)

Output a string to the display. Allow any location. Allow the string to be inverted.

Parameters:

str - String to display

x - X location (pixels)

y - Y location (pixels)

invert - set to true to displayed the string inverted

drawChar

public static void drawChar(char c,
                            int x,
                            int y,
                            boolean invert)

Draw a single char to an arbitary location on the screen.

Parameters:

c - Character to display

x - X location (pixels)

y - Y location (pixels)

invert - Set to true to invert the display

drawString

public static void drawString(String str,
                              int x,
                              int y,
                              int rop)

Output a string to the display. Allow any location. Allow use of raster operations.

Parameters:

str - String to display

x - X location (pixels)

y - Y location (pixels)

rop - Raster operation

drawChar

public static void drawChar(char c,
                            int x,
                            int y,
                            int rop)

Draw a single char to an arbitary location on the screen.

Parameters:

c - Character to display

x - X location (pixels)

y - Y location (pixels)

rop - Raster operation for how to combine with existing content

drawPixels

public static void drawPixels(byte b,
                              int x,
                              int y,
                              boolean invert)

Draw pixels a byte at a time. Should probably no longer be used.

Parameters:

b -

x -

y -

invert -

clearDisplay

public static void clearDisplay()

setDisplay

public static void setDisplay()

drawString

public static void drawString(String str,
                              int x,
                              int y)

Display a string on the LCD at specified x,y co-ordinate.

drawInt

public static void drawInt(int i,
                           int x,
                           int y)

Display an int on the LCD at specified x,y co-ordinate.

drawInt

public static void drawInt(int i,
                           int places,
                           int x,
                           int y)

Display an in on the LCD at x,y with leading spaces to occupy at least the number of characters specified by the places parameter.

refresh

public static void refresh()

Update the display.

clear

public static void clear()

Clear the display.

setDisplay

public static void setDisplay(int[] buff)

Write graphics from a Java buffer to the display.

getDisplay

public static byte[] getDisplay()

Provide access to the LCD display frame buffer. Allows both the firmware and Java to make changes.

Returns:

byte array that is the frame buffer.

getSystemFont

public static byte[] getSystemFont()

Provide access to the LCD system font. Allows both the firmware and Java to share the same font bitmaps.

Returns:

byte array that is the frame buffer.

setAutoRefresh

public static void setAutoRefresh(int mode)

Turn on/off the automatic refresh of the LCD display. At system startup auto refresh is on.

Parameters:

mode - 1 to enable 0 to disable

bitBlt

public static void bitBlt(byte[] src,
                          int sw,
                          int sh,
                          int sx,
                          int sy,
                          byte[] dst,
                          int dw,
                          int dh,
                          int dx,
                          int dy,
                          int w,
                          int h,
                          int rop)

Standard two input BitBlt function. Supports standard raster ops and overlapping images. Images are held in native leJOS/Lego format.

Parameters:

src - byte array containing the source image

sw - Width of the source image

sh - Height of the source image

sx - X position to start the copy from

sy - Y Position to start the copy from

dst - byte array containing the destination image

dw - Width of the destination image

dh - Height of the destination image

dx - X destination

dy - Y destination

w - width of the area to copy

h - height of the area to copy

rop - raster operation.

scroll

public static void scroll()

Scrolls the screen up one text line