2D Drawing Functions


Statements and procedures for working with 2D graphics.

Description:
The statements and procedures listed here provide ways of drawing to the screen. Image buffers can be created and blitted to the screen using a variety of blending methods. Palette colors can be retrieved or set in graphics modes that support them.

Working with Color
Procedures that control the color used by other drawing procedures.
Drawing to Image Buffers
Procedures that draw shapes and text onto image buffers or to the screen.
Image Buffer Creation
Procedures that create, free and save image buffers.
Blitting Image Buffers
Procedures that draw image buffers onto other image buffers or to the screen.

Working with Color
COLOR
Sets the foreground and background color to use with the drawing procedures.
PALETTE
Gets or sets color table information in paletted modes.
RGB
Returns a color value for hi/truecolor modes.
RGBA
Returns a color value including alpha (transparency) for hi/truecolor modes.
POINT
Gets a pixel value from an image buffer or screen.

Drawing to Image Buffers
PSET and PRESET
Plots a single pixel on an image buffer or screen.
LINE (GRAPHICS)
Plots a line of pixels on an image buffer or screen.
CIRCLE
Plots circles and ellipses on an image buffer or screen.
DRAW
Draws in a sequence of commands on an image buffer or screen.
DRAW STRING
Writes text to an image buffer or screen.
PAINT
Fills an area with color on an image buffer or screen.

Image Buffer Creation
GET (GRAPHICS)
Creates an image buffer from a portion of another image buffer or screen.
IMAGECREATE
Creates an image buffer of a certain size and pixel depth.
IMAGEDESTROY
Frees an image buffer resource.
IMAGECONVERTROW
Converts a row of pixels in an image buffer to a different color depth.
IMAGEINFO
Retrieves useful information about an image buffer
BLOAD
Creates an image buffer from a file.
BSAVE
Saves an image buffer to a file.
Blitting Image Buffers
PUT (GRAPHICS)
Blits an image buffer to another image buffer or screen.

Blending Methods
ADD
Saturated addition of the source and target components.
ALPHA
Blend using a uniform transparency or the image buffer's alpha channel.
AND
Combine the source and target components using a bitwise And
OR
Combine the source and target components using a bitwise Or
PSET
Directly copy pixel colors from the source to the destination.
TRANS
Pixels matching the transparent mask color are not blitted.
CUSTOM
Allows a custom blending procedure to be used.
XOR
Combine the source and target components using a bitwise Xor
 


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