All Known Implementing Classes:

ECMA48Terminal, HeadlessBackend, LogicalScreen, MultiScreen, SwingTerminal
```
public interface Screen
```
Drawing operations API.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`clear()`	Clear the logical screen.
`void`	`clearPhysical()`	Clear the physical screen.
`void`	`copySelection(Clipboard clipboard, int x0, int y0, int x1, int y1, boolean rectangle)`	Copy the screen selection area to the clipboard.
`void`	`drawBox(int left, int top, int right, int bottom, CellAttributes border, CellAttributes background)`	Draw a box with a border and empty background.
`void`	`drawBox(int left, int top, int right, int bottom, CellAttributes border, CellAttributes background, int borderType, boolean shadow)`	Draw a box with a border and empty background.
`void`	`drawBoxShadow(int left, int top, int right, int bottom)`	Draw a box shadow.
`void`	`flushPhysical()`	Classes must provide an implementation to push the logical screen to the physical device.
`CellAttributes`	`getAttrXY(int x, int y)`	Get the attributes at one location.
`Cell`	`getCharXY(int x, int y)`	Get the cell at one location in absolute coordinates.
`Cell`	`getCharXY(int x, int y, boolean clip)`	Get the cell at one location, in either absolute or clipped coordinates.
`int`	`getClipBottom()`	Get bottom drawing clipping boundary.
`int`	`getClipLeft()`	Get left drawing clipping boundary.
`int`	`getClipRight()`	Get right drawing clipping boundary.
`int`	`getClipTop()`	Get top drawing clipping boundary.
`int`	`getCursorX()`	Get the cursor X position.
`int`	`getCursorY()`	Get the cursor Y position.
`int`	`getHeight()`	Get the height.
`int`	`getOffsetX()`	Get drawing offset for x.
`int`	`getOffsetY()`	Get drawing offset for y.
`int`	`getTextHeight()`	Get the height of a character cell in pixels.
`int`	`getTextWidth()`	Get the width of a character cell in pixels.
`int`	`getWidth()`	Get the width.
`void`	`hideCursor()`	Hide the cursor.
`void`	`hLineXY(int x, int y, int n, int ch, CellAttributes attr)`	Draw a horizontal line from (x, y) to (x + n, y).
`void`	`invertCell(int x, int y)`	Invert the cell color at a position, including both halves of a double-width cell.
`void`	`invertCell(int x, int y, boolean onlyThisCell)`	Invert the cell color at a position.
`boolean`	`isCursorVisible()`	Get the cursor visibility.
`boolean`	`isDirty()`	Get dirty flag.
`void`	`putAll(int ch, CellAttributes attr)`	Fill the entire screen with one character with attributes.
`void`	`putAttrXY(int x, int y, CellAttributes attr)`	Set the attributes at one location.
`void`	`putAttrXY(int x, int y, CellAttributes attr, boolean clip)`	Set the attributes at one location.
`void`	`putCharXY(int x, int y, int ch)`	Render one character without changing the underlying attributes.
`void`	`putCharXY(int x, int y, int ch, CellAttributes attr)`	Render one character with attributes.
`void`	`putCharXY(int x, int y, Cell ch)`	Render one character with attributes.
`void`	`putCursor(boolean visible, int x, int y)`	Put the cursor at (x,y).
`void`	`putStringXY(int x, int y, java.lang.String str)`	Render a string without changing the underlying attribute.
`void`	`putStringXY(int x, int y, java.lang.String str, CellAttributes attr)`	Render a string.
`void`	`reset()`	Reset screen to not-bold, white-on-black.
`void`	`resetClipping()`	Flush the offset and clip variables.
`void`	`setClipBottom(int clipBottom)`	Set bottom drawing clipping boundary.
`void`	`setClipLeft(int clipLeft)`	Set left drawing clipping boundary.
`void`	`setClipRight(int clipRight)`	Set right drawing clipping boundary.
`void`	`setClipTop(int clipTop)`	Set top drawing clipping boundary.
`void`	`setDimensions(int width, int height)`	Change the width and height.
`void`	`setHeight(int height)`	Change the height.
`void`	`setOffsetX(int offsetX)`	Set drawing offset for x.
`void`	`setOffsetY(int offsetY)`	Set drawing offset for y.
`void`	`setSelection(int x0, int y0, int x1, int y1, boolean rectangle)`	Set a selection area on the screen.
`void`	`setTitle(java.lang.String title)`	Set the window title.
`void`	`setWidth(int width)`	Change the width.
`Screen`	`snapshot()`	Obtain a snapshot copy of the screen.
`void`	`unsetImageRow(int y)`	Unset every image cell on one row of the physical screen, forcing images on that row to be redrawn.
`void`	`vLineXY(int x, int y, int n, int ch, CellAttributes attr)`	Draw a vertical line from (x, y) to (x, y + n).

- Method Detail
  - setOffsetX
```
void setOffsetX(int offsetX)
```
    Set drawing offset for x.
    
    Parameters:
    
    offsetX - new drawing offset
  - getOffsetX
```
int getOffsetX()
```
    Get drawing offset for x.
    
    Returns:
    
    the drawing offset
  - setOffsetY
```
void setOffsetY(int offsetY)
```
    Set drawing offset for y.
    
    Parameters:
    
    offsetY - new drawing offset
  - getOffsetY
```
int getOffsetY()
```
    Get drawing offset for y.
    
    Returns:
    
    the drawing offset
  - getClipRight
```
int getClipRight()
```
    Get right drawing clipping boundary.
    
    Returns:
    
    drawing boundary
  - setClipRight
```
void setClipRight(int clipRight)
```
    Set right drawing clipping boundary.
    
    Parameters:
    
    clipRight - new boundary
  - getClipBottom
```
int getClipBottom()
```
    Get bottom drawing clipping boundary.
    
    Returns:
    
    drawing boundary
  - setClipBottom
```
void setClipBottom(int clipBottom)
```
    Set bottom drawing clipping boundary.
    
    Parameters:
    
    clipBottom - new boundary
  - getClipLeft
```
int getClipLeft()
```
    Get left drawing clipping boundary.
    
    Returns:
    
    drawing boundary
  - setClipLeft
```
void setClipLeft(int clipLeft)
```
    Set left drawing clipping boundary.
    
    Parameters:
    
    clipLeft - new boundary
  - getClipTop
```
int getClipTop()
```
    Get top drawing clipping boundary.
    
    Returns:
    
    drawing boundary
  - setClipTop
```
void setClipTop(int clipTop)
```
    Set top drawing clipping boundary.
    
    Parameters:
    
    clipTop - new boundary
  - isDirty
```
boolean isDirty()
```
    Get dirty flag.
    
    Returns:
    
    if true, the logical screen is not in sync with the physical screen
  - getAttrXY
```
CellAttributes getAttrXY(int x,
                         int y)
```
    Get the attributes at one location.
    
    Parameters:
    
    x - column coordinate. 0 is the left-most column.
    
    y - row coordinate. 0 is the top-most row.
    
    Returns:
    
    attributes at (x, y)
  - getCharXY
```
Cell getCharXY(int x,
               int y)
```
    Get the cell at one location in absolute coordinates.
    
    Parameters:
    
    x - column coordinate. 0 is the left-most column.
    
    y - row coordinate. 0 is the top-most row.
    
    Returns:
    
    the character + attributes
  - getCharXY
```
Cell getCharXY(int x,
               int y,
               boolean clip)
```
    Get the cell at one location, in either absolute or clipped coordinates.
    
    Parameters:
    
    x - column coordinate. 0 is the left-most column.
    
    y - row coordinate. 0 is the top-most row.
    
    clip - if true, honor clipping/offset
    
    Returns:
    
    the character + attributes, or null if this position is outside the clipping/offset region
  - putAttrXY
```
void putAttrXY(int x,
               int y,
               CellAttributes attr)
```
    Set the attributes at one location.
    
    Parameters:
    
    x - column coordinate. 0 is the left-most column.
    
    y - row coordinate. 0 is the top-most row.
    
    attr - attributes to use (bold, foreColor, backColor)
  - putAttrXY
```
void putAttrXY(int x,
               int y,
               CellAttributes attr,
               boolean clip)
```
    Set the attributes at one location.
    
    Parameters:
    
    x - column coordinate. 0 is the left-most column.
    
    y - row coordinate. 0 is the top-most row.
    
    attr - attributes to use (bold, foreColor, backColor)
    
    clip - if true, honor clipping/offset
  - putAll
```
void putAll(int ch,
            CellAttributes attr)
```
    Fill the entire screen with one character with attributes.
    
    Parameters:
    
    ch - character to draw
    
    attr - attributes to use (bold, foreColor, backColor)
  - putCharXY
```
void putCharXY(int x,
               int y,
               Cell ch)
```
    Render one character with attributes.
    
    Parameters:
    
    x - column coordinate. 0 is the left-most column.
    
    y - row coordinate. 0 is the top-most row.
    
    ch - character + attributes to draw
  - putCharXY
```
void putCharXY(int x,
               int y,
               int ch,
               CellAttributes attr)
```
    Render one character with attributes.
    
    Parameters:
    
    x - column coordinate. 0 is the left-most column.
    
    y - row coordinate. 0 is the top-most row.
    
    ch - character to draw
    
    attr - attributes to use (bold, foreColor, backColor)
  - putCharXY
```
void putCharXY(int x,
               int y,
               int ch)
```
    Render one character without changing the underlying attributes.
    
    Parameters:
    
    x - column coordinate. 0 is the left-most column.
    
    y - row coordinate. 0 is the top-most row.
    
    ch - character to draw
  - putStringXY
```
void putStringXY(int x,
                 int y,
                 java.lang.String str,
                 CellAttributes attr)
```
    Render a string. Does not wrap if the string exceeds the line.
    
    Parameters:
    
    x - column coordinate. 0 is the left-most column.
    
    y - row coordinate. 0 is the top-most row.
    
    str - string to draw
    
    attr - attributes to use (bold, foreColor, backColor)
  - putStringXY
```
void putStringXY(int x,
                 int y,
                 java.lang.String str)
```
    Render a string without changing the underlying attribute. Does not wrap if the string exceeds the line.
    
    Parameters:
    
    x - column coordinate. 0 is the left-most column.
    
    y - row coordinate. 0 is the top-most row.
    
    str - string to draw
  - vLineXY
```
void vLineXY(int x,
             int y,
             int n,
             int ch,
             CellAttributes attr)
```
    Draw a vertical line from (x, y) to (x, y + n).
    
    Parameters:
    
    x - column coordinate. 0 is the left-most column.
    
    y - row coordinate. 0 is the top-most row.
    
    n - number of characters to draw
    
    ch - character to draw
    
    attr - attributes to use (bold, foreColor, backColor)
  - hLineXY
```
void hLineXY(int x,
             int y,
             int n,
             int ch,
             CellAttributes attr)
```
    Draw a horizontal line from (x, y) to (x + n, y).
    
    Parameters:
    
    x - column coordinate. 0 is the left-most column.
    
    y - row coordinate. 0 is the top-most row.
    
    n - number of characters to draw
    
    ch - character to draw
    
    attr - attributes to use (bold, foreColor, backColor)
  - setWidth
```
void setWidth(int width)
```
    Change the width. Everything on-screen will be destroyed and must be redrawn.
    
    Parameters:
    
    width - new screen width
  - setHeight
```
void setHeight(int height)
```
    Change the height. Everything on-screen will be destroyed and must be redrawn.
    
    Parameters:
    
    height - new screen height
  - setDimensions
```
void setDimensions(int width,
                   int height)
```
    Change the width and height. Everything on-screen will be destroyed and must be redrawn.
    
    Parameters:
    
    width - new screen width
    
    height - new screen height
  - getHeight
```
int getHeight()
```
    Get the height.
    
    Returns:
    
    current screen height
  - getWidth
```
int getWidth()
```
    Get the width.
    
    Returns:
    
    current screen width
  - reset
```
void reset()
```
    Reset screen to not-bold, white-on-black. Also flushes the offset and clip variables.
  - resetClipping
```
void resetClipping()
```
    Flush the offset and clip variables.
  - clear
```
void clear()
```
    Clear the logical screen.
  - drawBox
```
void drawBox(int left,
             int top,
             int right,
             int bottom,
             CellAttributes border,
             CellAttributes background)
```
    Draw a box with a border and empty background.
    
    Parameters:
    
    left - left column of box. 0 is the left-most row.
    
    top - top row of the box. 0 is the top-most row.
    
    right - right column of box
    
    bottom - bottom row of the box
    
    border - attributes to use for the border
    
    background - attributes to use for the background
  - drawBox
```
void drawBox(int left,
             int top,
             int right,
             int bottom,
             CellAttributes border,
             CellAttributes background,
             int borderType,
             boolean shadow)
```
    Draw a box with a border and empty background.
    
    Parameters:
    
    left - left column of box. 0 is the left-most row.
    
    top - top row of the box. 0 is the top-most row.
    
    right - right column of box
    
    bottom - bottom row of the box
    
    border - attributes to use for the border
    
    background - attributes to use for the background
    
    borderType - if 1, draw a single-line border; if 2, draw a double-line border; if 3, draw double-line top/bottom edges and single-line left/right edges (like Qmodem)
    
    shadow - if true, draw a "shadow" on the box
  - drawBoxShadow
```
void drawBoxShadow(int left,
                   int top,
                   int right,
                   int bottom)
```
    Draw a box shadow.
    
    Parameters:
    
    left - left column of box. 0 is the left-most row.
    
    top - top row of the box. 0 is the top-most row.
    
    right - right column of box
    
    bottom - bottom row of the box
  - clearPhysical
```
void clearPhysical()
```
    Clear the physical screen.
  - unsetImageRow
```
void unsetImageRow(int y)
```
    Unset every image cell on one row of the physical screen, forcing images on that row to be redrawn.
    
    Parameters:
    
    y - row coordinate. 0 is the top-most row.
  - flushPhysical
```
void flushPhysical()
```
    Classes must provide an implementation to push the logical screen to the physical device.
  - putCursor
```
void putCursor(boolean visible,
               int x,
               int y)
```
    Put the cursor at (x,y).
    
    Parameters:
    
    visible - if true, the cursor should be visible
    
    x - column coordinate to put the cursor on
    
    y - row coordinate to put the cursor on
  - hideCursor
```
void hideCursor()
```
    Hide the cursor.
  - isCursorVisible
```
boolean isCursorVisible()
```
    Get the cursor visibility.
    
    Returns:
    
    true if the cursor is visible
  - getCursorX
```
int getCursorX()
```
    Get the cursor X position.
    
    Returns:
    
    the cursor x column position
  - getCursorY
```
int getCursorY()
```
    Get the cursor Y position.
    
    Returns:
    
    the cursor y row position
  - setTitle
```
void setTitle(java.lang.String title)
```
    Set the window title.
    
    Parameters:
    
    title - the new title
  - getTextWidth
```
int getTextWidth()
```
    Get the width of a character cell in pixels.
    
    Returns:
    
    the width in pixels of a character cell
  - getTextHeight
```
int getTextHeight()
```
    Get the height of a character cell in pixels.
    
    Returns:
    
    the height in pixels of a character cell
  - invertCell
```
void invertCell(int x,
                int y)
```
    Invert the cell color at a position, including both halves of a double-width cell.
    
    Parameters:
    
    x - column position
    
    y - row position
  - invertCell
```
void invertCell(int x,
                int y,
                boolean onlyThisCell)
```
    Invert the cell color at a position.
    
    Parameters:
    
    x - column position
    
    y - row position
    
    onlyThisCell - if true, only invert this cell, otherwise invert both halves of a double-width cell if necessary
  - setSelection
```
void setSelection(int x0,
                  int y0,
                  int x1,
                  int y1,
                  boolean rectangle)
```
    Set a selection area on the screen.
    
    Parameters:
    
    x0 - the starting X position of the selection
    
    y0 - the starting Y position of the selection
    
    x1 - the ending X position of the selection
    
    y1 - the ending Y position of the selection
    
    rectangle - if true, this is a rectangle select
  - copySelection
```
void copySelection(Clipboard clipboard,
                   int x0,
                   int y0,
                   int x1,
                   int y1,
                   boolean rectangle)
```
    Copy the screen selection area to the clipboard.
    
    Parameters:
    
    clipboard - the clipboard to use
    
    x0 - the starting X position of the selection
    
    y0 - the starting Y position of the selection
    
    x1 - the ending X position of the selection
    
    y1 - the ending Y position of the selection
    
    rectangle - if true, this is a rectangle select
  - snapshot
```
Screen snapshot()
```
    Obtain a snapshot copy of the screen.
    
    Returns:
    
    a copy of the screen's data

Interface Screen

Method Summary

Method Detail

setOffsetX

getOffsetX

setOffsetY

getOffsetY

getClipRight

setClipRight

getClipBottom

setClipBottom

getClipLeft

setClipLeft

getClipTop

setClipTop

isDirty

getAttrXY

getCharXY

getCharXY

putAttrXY

putAttrXY

putAll

putCharXY

putCharXY

putCharXY

putStringXY

putStringXY

vLineXY

hLineXY

setWidth

setHeight

setDimensions

getHeight

getWidth

reset

resetClipping

clear

drawBox

drawBox

drawBoxShadow

clearPhysical

unsetImageRow

flushPhysical

putCursor

hideCursor

isCursorVisible

getCursorX

getCursorY

setTitle

getTextWidth

getTextHeight

invertCell

invertCell

setSelection

copySelection

snapshot