Graphics Functions and Statements

 Setting screen- display characteristics
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 SCREEN Statement
 Specifies a BASIC screen mode, which determines screen characteristics such
 as graphics capability, resolution, and color-number range.

 SCREEN Function
 Returns a character's ASCII value or its color from a specified screen
 location.


 Plotting or erasing a single point
 ----------------------------------
 PSET
 Draws a pixel on the screen in the specified color, using the screen's
 foreground color as default.

 PRESET
 Draws a pixel on the screen in the specified color, using the screen's
 background color as default.

 Drawing shapes
 --------------
 LINE
 Draws a straight line or a box.

 CIRCLE
 Draws a circle, ellipse, arc, or pie.

 DRAW
 Draws an object. Combines many of the features of other BASIC graphics
 statements into a graphics macro language.


 Defining screen coordinates
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 VIEW
 Specifies a rectangle on the screen (or viewport) as the area for graphics
 output.

 WINDOW
 Defines the dimensions of the current viewport.

 PMAP
 Maps view coordinates to window coordinates, or vice versa.

 POINT(number)
 Returns the screen coordinates of the graphics cursor, or the color of a
 specified pixel.


 Using color
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 COLOR
 Sets the default colors used in graphics output.

 PALETTE
 Assigns different attributes to color numbers. Works only on systems
 equipped with an EGA or VGA.

 POINT(x, y)
 Returns the color number of a pixel whose screen coordinates are x and y.


 Painting enclosed shapes
 ------------------------
 PAINT
 Fills an area on the screen with a color or pattern.


 Animating
 ---------
 GET
 Copies a rectangular area on the screen by translating the image to numeric
 data and storing the data in a numeric array.

 PUT
 Displays an image on the screen that was previously copied with GET.

 PCOPY
 Copies one screen page to another.