Merge branch 'master' of git.shadowcat.co.uk:SDL-Site

[sdlgit/SDL-Site.git] / pages / SDL-Cursor.html-inc

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<h3 id="TOP">Index</h3>

<ul><li><a href="#NAME">NAME</a></li>
<li><a href="#CATEGORY">CATEGORY</a></li>
<li><a href="#SYNOPSIS">SYNOPSIS</a></li>
<li><a href="#DESCRIPTION">DESCRIPTION</a></li>
<li><a href="#METHODS">METHODS</a>
<ul><li><a href="#new">new</a></li>
</ul>
</li>
<li><a href="#AUTHORS">AUTHORS</a></li>
<li><a href="#SEE_ALSO">SEE ALSO</a>
</li>
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<h1 id="NAME">NAME</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="NAME_CONTENT">
<p>SDL::Cursor - Mouse cursor structure</p>

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<h1 id="CATEGORY">CATEGORY</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="CATEGORY_CONTENT">
<p>Core, Mouse, Structure</p>

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<h1 id="SYNOPSIS">SYNOPSIS</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="SYNOPSIS_CONTENT">
<pre> my $cursor = SDL::Cursor-&gt;new(
     \@data,
     \@mask,
     $width,
     $height,
     $hotspot_left,
     $hotspot_top
 );

 SDL::Mouse::set_cursor($cursor);

</pre>

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<h1 id="DESCRIPTION">DESCRIPTION</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="DESCRIPTION_CONTENT">
<p>The <code>SDL::Cursor</code> module handles mouse cursors, and allows the developer to use custom-made cursors.
Note that cursors can only be in black and white.</p>

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<h1 id="METHODS">METHODS</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="METHODS_CONTENT">

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<h2 id="new">new</h2>
<div id="new_CONTENT">
<pre> my $cursor = SDL::Cursor-&gt;new(
     \@data, \@mask, $width, $height, $hotspot_left, $hotspot_top
 );

</pre>
<p>Create a cursor using the specified data and mask (in MSB format).
The cursor is created in black and white according to the following:</p>
<pre> Data / Mask   Resulting pixel on screen
    0 / 1      White
    1 / 1      Black
    0 / 0      Transparent
    1 / 0      Inverted color if possible, black if not.

</pre>
<p>If you want to have color cursor, then this function is not for you.
Instead, you should hide the cursor with <code>SDL::Mouse::show_cursor(SDL_DISABLE)</code>.
Then in your main loop, when you draw graphics, draw a <code>SDL::Surface</code> at the location of the mouse cursor.</p>
<p>Example:</p>
<pre> use SDL;
 use SDL::Video;
 use SDL::Mouse;
 use SDL::Cursor;

 SDL::init(SDL_INIT_VIDEO);
 SDL::Video::set_video_mode(640, 480, 16, SDL_SWSURFACE);

 my @data = (
     0b00000000,
     0b00111100,
     0b01111110,
     0b01111110,
     0b01111110,
     0b01111110,
     0b00111100,
     0b00000000
 );
 my @mask = (
     0b00111100,
     0b01111110,
     0b11100111,
     0b11000011,
     0b11000011,
     0b11100111,
     0b01111110,
     0b00111100
 );
 my $cursor = SDL::Cursor-&gt;new(\@data, \@mask, 8, 8, 0, 0);
 sleep(1);

 SDL::Mouse::set_cursor($cursor);
 sleep(5);

</pre>
<p>The width of cursors work in groups of 8.
If the width is above 8, twice the amount of elements in <code>@data</code> and <code>@mask</code> are required.
If the width is above 16, three times are required, and so on.
For example, if you wanted a 9 pixel crosshair you might do the following:</p>
<pre> my @data = (
     0b00001000,0b00000000,
     0b00001000,0b00000000,
     0b00001000,0b00000000,
     0b00001000,0b00000000,
     0b11111111,0b10000000,
     0b00001000,0b00000000,
     0b00001000,0b00000000,
     0b00001000,0b00000000,
     0b00001000,0b00000000,
 );
 my @mask = @data;

 my $cursor = SDL::Cursor-&gt;new(\@data, \@mask, 9, 9, 4, 4);

</pre>
<p>The hotspot is offset by 4 pixels because a crosshair clicks from the center instead of the top left.</p>

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<h1 id="AUTHORS">AUTHORS</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="AUTHORS_CONTENT">
<p>See <a href="/SDL.html#AUTHORS">/SDL.html#AUTHORS</a>.</p>





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<h1 id="SEE_ALSO">SEE ALSO</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="SEE_ALSO_CONTENT">
<p><a href="http://search.cpan.org/perldoc?perl">perl</a> <a href="SDL-Mouse.html">SDL::Mouse</a></p>

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