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POLooking for a XPCE tutorial
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copied!<p>I'm going to write a simple animation in XPCE (<a href="http://en.wikipedia.org/wiki/Four_glasses_puzzle" rel="nofollow">four glasses puzzle</a> to be precise). I know absolutely nothing about XPCE so I looked up a tutorial but the results are disappointing. Could anyone point me to some materials on the following:</p> <ul> <li>working with a "canvas"</li> <li>animation</li> <li>timers</li> </ul> <p>EDIT: Okay, here's a more detailed problem: I want to draw two boxes, wait two seconds, hide the boxes, then start a timer. </p> <pre><code>new(@box1, box(100,100)), send(W, display, @box1), new(@box2, box(100,100)), send(W, display, @box2, point(200, 200)), % wait two seconds here % hide the boxes here new(Msg1, and(message(B1, relative_move, point(5, 0)), message(B4, relative_move, point(0, 5)))), send(W, attribute, attribute(timer, new(T, timer(0.1, Msg1)))), send(T, start), </code></pre> <p>EDIT 2: Okay, here is another question (should I open a new question?): This is the code I'm using:</p> <pre><code>get_file(0, 'glass.gif'). get_file(180, 'glass180.gif'). main(GA, GB, GC, GD) :- % e.g. main(0,0,180,0). new(B1, figure), get_file(GA, G1), send(B1, display, new(BM1, bitmap(G1))), send(BM1, transparent, @on), send(W, display, B1, point(0,0)), %analogically for the other three glasses </code></pre> <p>I'd like to set a new bitmap for <code>B1</code>. How do I do that? Would altering <code>BM1</code> be enough? Or perhaps there is an alternative solution? I've been thinking about drawing both upright and reversed glasses off-screen and swapping them, but I'm not sure about the details of such solution.</p> <p>EDIT2': Solved it. For posterity: </p> <pre><code>send(B1, clear), send(B1, display, bitmap('glass_while_animating_1.gif')), send(timer(0.1), delay), send(B1, clear), send(B1, display, bitmap('glass_while_animating_2.gif')), % etc </code></pre>

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