Reference for unit 'Graph': Variables

`Circle`		Draw a complete circle
`ClearViewPort`		Clear the current viewport
`DirectPutPixel`		Hook to directly draw a pixel on the screen.
`GetBkColor`		Return current background color
`GetImage`		Return a copy of a screen area
`GetPixel`		Return color of pixel
`GetRGBPalette`		Hook to set a RGB palette entries.
`GetScanLine`		Hook to get a scan line from the screen.
`GraphFreeMemPtr`		Hook to free heap memory.
`GraphGetMemPtr`		Hook to get heap memory
`HLine`		Hook to draw a solid horizontal line
`ImageSize`		Return size to store image
`InternalEllipse`		Hook to draw an ellipse
`Line`		Draw a line between 2 points
`OutTextXY`		Write text on the screen on given position
`PatternLine`		Hook to draw a patterned line
`PutImage`		Draw an in-memory image to the screen
`PutPixel`		Draw a pixel on the screen
`RestoreVideoState`		Hook to restore a saved video mode
`SaveVideoState`		Hook to save the current video state
`SetActivePage`		Set active graphical page
`SetAllPalette`		Specify a complete new palette
`SetBkColor`		Set background drawing color
`SetRGBPalette`		Set palette entry using RGB value
`SetVisualPage`		Set video page which is displayed.
`VLine`		Hook to draw a solid vertical line