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Add timer examples

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Matthias Richter 2010-10-17 16:24:27 +02:00
parent 960f776377
commit fc9aae5b83
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@ -282,7 +282,8 @@ module by clicking these:
the supplied <code>length</code>) of time that has passed, but 1.0 at max.</p>
<p><code>Interpolator</code> creates a function that will have to be called in <code>love.update</code>, which
will itself execute <code>func</code> with the right parameters. It returns <code>true</code> as long as
the interpolation is not yet finished or <code>nil</code> if the interpolation stopped.</p>
the interpolation is not yet finished or <code>nil</code> if the interpolation stopped as well
as any parameters that the function returns.</p>
<table>
<tr><th>Parameters:</th><td class="p"><em>[number]</em><code>length</code>:</td><td>Interpolation length.</td></tr>
<tr><th></th><td class="p"><em>[function]</em><code>func</code>:</td><td>Interpolating function.</td></tr>
@ -294,8 +295,59 @@ module by clicking these:
<a name="timer.lua-Example"></a>
<h4>Example usage</h4>
<div class="doc"><span class="function">Timer example <a class="top" href="#timer.lua">^ top</a></span>
This example will print the number of elapsed seconds in the top left corner using a periodic function and
show five circles one after another using delayed functions:
<pre>time = 0
circles = {}
function love.load()
Timer.add(1, function() circles[#circles+1] = {x = 100, y = 100, r = 10} end)
Timer.add(2, function() circles[#circles+1] = {x = 130, y = 130, r = 20} end)
Timer.add(3, function() circles[#circles+1] = {x = 180, y = 180, r = 30} end)
Timer.add(4, function() circles[#circles+1] = {x = 250, y = 250, r = 40} end)
Timer.add(5, function() circles[#circles+1] = {x = 340, y = 340, r = 50} end)
Timer.addPeriodic(1, function() time = time + 1 end)
love.graphics.setBackgroundColor(255,255,255)
love.graphics.setColor(0,0,0)
end
function love.update(dt)
Timer.update(dt)
end
function love.draw()
for _,c in ipairs(circle) do
love.graphics.circle('fill', c.x, c.y, c.r)
end
end</pre>
</div>
<div class="doc"><span class="function">Implementing <code>Timer.addPeriodic()</code> <a class="top" href="#timer.lua">^ top</a></span>
Since the function will receive itself as parameter when called, it is easy to implement
a function that will reschedule itself:
<pre>Timer.add(1, function(func) print("foo") Timer.add(1, func) end)</pre>
</pre>
</div>
<div class="doc"><span class="function">Using Interpolator <a class="top" href="#timer.lua">^ top</a></span>
This example uses an interpolating function to fade the background from black to white and
move a circle along the x-axis:
<pre>function love.load()
love.graphics.setBackgroundColor(0,0,0)
love.graphics.setColor(0,0,0)
end
xpos = 100
fader = Interpolator(5, function(frac) love.graphics.setBackgroundColor(frac*255,frac*255,frac*255) end)
mover = Interpolator(10, function(frac) xpos = 10 + 600 * frac end)
function love.update(dt)
fader(dt)
mover(dt)
end
function love.draw()
love.graphics.circle(xpos, 300, 80)
end</pre>
</div>
</div>