23 lines
949 B
HTML
23 lines
949 B
HTML
<HTML>
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<HEAD>
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<TITLE>block</TITLE></HEAD>
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<BODY>
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<h1>block</h1>
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<B>Category</B><p>
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<a href="object_commands.html">Object/view commands</a><p>
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<B>Syntax</B><p>
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<p>
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block(X1,Y1,X2,Y2);<p>
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<B>Description</B><p>
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<p>
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This sets up an invisible rectangular block on the screen with top-left co-ordinates X1,Y1 and bottom-right co-ordinates X2,Y2. Objects are not allowed to cross the borders of this block (unless they
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are told to ignore blocks). The block can be removed using the <a href="unblock.html">unblock</a> command.
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<p>
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Note: You can only have one block on the screen at a time. If a block already exists, and you use the block command again, the new block will be there but the old one will be gone.<p>
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<B>See also</B><p>
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<a href="unblock.html">unblock</a><p>
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<a href="ignore_blocks.html">ignore.blocks</a><p>
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<a href="observe_blocks.html">observe.blocks</a><p>
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<a href="controlling_obstacles.html">Controlling obstacles</a><p>
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</BODY></HTML>
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