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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>g2: color manipulations</title>
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<h1>color manipulations<br>
<small>
[<a class="el" href="group__interface.html">g2 User Interface</a>]</small>
</h1><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__color.html#g23fb2c58c675c566a16f8e9f738f102e">g2_pen</a> (int dev, int color)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__color.html#g8d697444755ba6547eda9732c6b541c8">g2_set_background</a> (int dev, int color)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__color.html#g85f53048c6eb057e1ebdaeed53e3e5d9">g2_ink</a> (int pd_dev, double red, double green, double blue)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__color.html#g30156659826923e02d120789151bd317">g2_reset_palette</a> (int dev)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__color.html#g26ec16f8e6acc9fb75d02b25e3168fc0">g2_clear_palette</a> (int dev)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__color.html#g198d8d8a36b027be24e2c46076ecabd2">g2_allocate_basic_colors</a> (int dev)</td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
The color concept used in the g2 library is inspired by Sir Clive Sinclair solution implemented in the ZX Spectrum computer. With the <a class="el" href="group__color.html#g23fb2c58c675c566a16f8e9f738f102e">g2_pen()</a> function it is possible to choose a pen created by the <a class="el" href="group__color.html#g85f53048c6eb057e1ebdaeed53e3e5d9">g2_ink()</a> function. Note that g2_ink function is only defined for physical devices. The predefined colors (see g2_test demo program) have pens from 0 till 26 (inclusive).<p>
Some basic colors are:<ul>
<li>0 white</li><li>1 black</li><li>3 blue</li><li>7 green</li><li>19 red</li><li>25 yellow </li></ul>
<hr><h2>Function Documentation</h2>
<a class="anchor" name="g198d8d8a36b027be24e2c46076ecabd2"></a><!-- doxytag: member="g2_ui_control.c::g2_allocate_basic_colors" ref="g198d8d8a36b027be24e2c46076ecabd2" args="(int dev)" --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">void g2_allocate_basic_colors </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">int </td>
<td class="mdname1" valign="top" nowrap> <em>dev</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
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<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Allocate basic colors<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dev</em> </td><td>device </td></tr>
</table>
</dl>
</td>
</tr>
</table>
<a class="anchor" name="g26ec16f8e6acc9fb75d02b25e3168fc0"></a><!-- doxytag: member="g2_ui_control.c::g2_clear_palette" ref="g26ec16f8e6acc9fb75d02b25e3168fc0" args="(int dev)" --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">void g2_clear_palette </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">int </td>
<td class="mdname1" valign="top" nowrap> <em>dev</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Remove all inks.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dev</em> </td><td>device </td></tr>
</table>
</dl>
</td>
</tr>
</table>
<a class="anchor" name="g85f53048c6eb057e1ebdaeed53e3e5d9"></a><!-- doxytag: member="g2_ui_control.c::g2_ink" ref="g85f53048c6eb057e1ebdaeed53e3e5d9" args="(int pd_dev, double red, double green, double blue)" --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
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<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top">int g2_ink </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">int </td>
<td class="mdname" nowrap> <em>pd_dev</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>double </td>
<td class="mdname" nowrap> <em>red</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>double </td>
<td class="mdname" nowrap> <em>green</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>double </td>
<td class="mdname" nowrap> <em>blue</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Create an ink. To put ink into the pen use <a class="el" href="group__color.html#g23fb2c58c675c566a16f8e9f738f102e">g2_pen()</a>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>pd_dev</em> </td><td>physical device </td></tr>
<tr><td valign="top"></td><td valign="top"><em>red</em> </td><td>red component (0-1) according to the RGB color model </td></tr>
<tr><td valign="top"></td><td valign="top"><em>green</em> </td><td>green component (0-1) according to the RGB color model </td></tr>
<tr><td valign="top"></td><td valign="top"><em>blue</em> </td><td>blue component (0-1) according to the RGB color model </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>new pen, see <a class="el" href="group__color.html#g23fb2c58c675c566a16f8e9f738f102e">g2_pen()</a> </dd></dl>
</td>
</tr>
</table>
<a class="anchor" name="g23fb2c58c675c566a16f8e9f738f102e"></a><!-- doxytag: member="g2_ui_control.c::g2_pen" ref="g23fb2c58c675c566a16f8e9f738f102e" args="(int dev, int color)" --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">void g2_pen </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">int </td>
<td class="mdname" nowrap> <em>dev</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>int </td>
<td class="mdname" nowrap> <em>color</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Set pen color for all following operations, see also <a class="el" href="group__color.html#g85f53048c6eb057e1ebdaeed53e3e5d9">g2_ink()</a>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dev</em> </td><td>device </td></tr>
<tr><td valign="top"></td><td valign="top"><em>color</em> </td><td>pen (either one of default pens 0-26, or a pen returned by <a class="el" href="group__color.html#g85f53048c6eb057e1ebdaeed53e3e5d9">g2_ink()</a> ) </td></tr>
</table>
</dl>
</td>
</tr>
</table>
<a class="anchor" name="g30156659826923e02d120789151bd317"></a><!-- doxytag: member="g2_ui_control.c::g2_reset_palette" ref="g30156659826923e02d120789151bd317" args="(int dev)" --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">void g2_reset_palette </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">int </td>
<td class="mdname1" valign="top" nowrap> <em>dev</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Clear collor palette (remove all inks) and reallocate basic colors.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dev</em> </td><td>device </td></tr>
</table>
</dl>
</td>
</tr>
</table>
<a class="anchor" name="g8d697444755ba6547eda9732c6b541c8"></a><!-- doxytag: member="g2_ui_control.c::g2_set_background" ref="g8d697444755ba6547eda9732c6b541c8" args="(int dev, int color)" --><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">void g2_set_background </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">int </td>
<td class="mdname" nowrap> <em>dev</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td class="md"></td>
<td class="md" nowrap>int </td>
<td class="mdname" nowrap> <em>color</em></td>
</tr>
<tr>
<td class="md"></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Set the background color<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dev</em> </td><td>device </td></tr>
<tr><td valign="top"></td><td valign="top"><em>color</em> </td><td>pen (either one of default pens 0-26, or a pen returned by <a class="el" href="group__color.html#g85f53048c6eb057e1ebdaeed53e3e5d9">g2_ink()</a> ) </td></tr>
</table>
</dl>
</td>
</tr>
</table>
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