2d Drawing Functions

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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 (Graphics Put)

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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Category: 2D Drawing Functions

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Reproduced from the FreeBASIC Wiki Manual under the GNU Free Documentation License 1.3 — with no Invariant Sections, no Front-Cover Texts and no Back-Cover Texts. Copyright © the FreeBASIC project and wiki contributors. See License.