25 lines
1.8 KiB
HTML
25 lines
1.8 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>Picture resources</TITLE></HEAD>
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<BODY>
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<h1>Picture resources</h1>
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<B>Picture</B> resources are full-screen images, usually used for backgrounds. They are vector-based rather than bitmaps, which means they are drawn using drawing commands such as lines and
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brushes, rather than by plotting pixels.
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<p>
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Each picture has two images (screens) - the visual screen and the priority screen. The visual screen is what the player sees when playing the game. <a href="view_descr.html">Views</a> are placed on top of
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the pictures during the game and can be moved around the screen. The priority screen is what makes the game appear to be 3-dimensional. On the AGI screen, there are 12 priority bands in which objects
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can be placed. The priority given to different parts of the picture (i.e. the colour of the pixels on the priority screen) determines where in 3-dimensional space objects appear. For example, a tree
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placed right at the front of the screen would be given a priority of 15 (the highest priority). A wall which is far away in the background would be given a priority of 4 (the lowest priority). If an
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object with a priority of 12 is displayed on the screen, it would be behind the tree but in front of the wall. The priority of a view is usually determined by its y-position.
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<p>
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Colours 0, 1, 2 and 3 on the priority screen are used for "control lines" which determine where the ego (the object controlled by the player) can walk.<p>
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Partial AGI picture tutorials can be found at the following sites
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(note that these links may become unavailable in the future):
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<p>
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<p><a href="http://weremoose.tripod.com/Tutorials.html">http://weremoose.tripod.com/Tutorials.html</a>
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<p><a href="http://www.iki.fi/jterho/agi/">http://www.iki.fi/jterho/agi/</a>
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<p>
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<a href="data_used.html">Back to data used by AGI</a><p>
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</BODY></HTML>
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