|Important Hardware Note|
|2||Getting Started with Graphics|
|3||Creating Geometric Shapes With PLOT Command|
|4||Shapes and Patterns|
|5||Other Graphic Designs|
|9||Tutorial - Creating a sprite animation|
Simple Colour Animation Applied to a Segment Routine
The website is intended for any user who is interested in creating geometric art by programming. RISC OS BASIC is fast and rendering quality good with current ARM based hardware. Inspiration for these graphic programs comes from the excellent collection of "55 BBC Micro Books" from the Drag 'N Drop editor, Chris Dewhurst..............
Much of the material is still relevant to current versions of RISC OS. Changes to the original programs were necessary to ensure compatibility with Raspberry Pi/Hi Def monitors. All programs are single tasking running outside the desktop.
The graphics processor in the Raspberry Pi switches from the desktop to running a BASIC program instantly. Delays can occur with other hardware like R-Comp Interactive's ARMX6 but will still run.
All program examples use a screen resolution of 1920 x 1080. This equates to a full HD widescreen monitor commonly available and giving the best graphic performance for the price. The MODE command commonly used in the tutorial is: MODE 1920,1080,32. The last parameter specifies the number of colours available. Also known as 'colour depth' this parameter equates to 32-bits/pixel producing 16 million colours (256*256*256). Other 'colour depth' parameters are 8-bits/pixel ie. 256 colours or 16-bits/pixel (32,000 colours).
More recent versions of BASIC enable user to code the resolution so that program can run automatically on any monitor. This is done by detecting the screen width and height and is fully explained in the BBC BASIC Reference Manual.