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<h1>5.3. Updating an image</h1>
<div id="toc">
<ul>
<li><a href="#0">Filling an image with a color</a></li>
<li><a href="#1">Changing the color of a pixel</a></li>
<li><a href="#2">Scaling an image</a></li>
<li><a href="#3">Flipping the image horizontally</a></li>
<li><a href="#4">Flipping the image vertically</a></li>
<li><a href="#5">Rotating the image clockwise</a></li>
<li><a href="#6">Inverting the colors of the image</a></li>
</ul>
</div>
<a name="0"></a>
<h3>Filling an image with a color</h3>
<p>You can fill the whole image with a color with :<br /> </p>
<div class="code">
<p class="cpp"><span class="code-keyword">void</span> TCODImage<span class="code-symbol">::</span>clear<span
class="code-symbol">(</span><span class="code-keyword">const</span> TCODColor color<span
class="code-symbol">)</span></p>
<p class="c"><span class="code-keyword">void</span> TCOD_image_clear<span class="code-symbol">(</span><span
class="code-tcod">TCOD_image_t</span> image<span class="code-symbol">,</span><span class="code-tcod">
TCOD_color_t</span> color<span class="code-symbol">)</span></p>
<p class="py">image_clear<span class="code-symbol">(</span>image<span class="code-symbol">,</span>color<span
class="code-symbol">)</span></p>
</div>
<table class="param">
<tbody>
<tr>
<th>Parameter</th>
<th>Description</th>
</tr>
<tr class="hilite">
<td>image</td>
<td>In the C and Python version, the image to fill.<br /> </td>
</tr>
<tr>
<td>color</td>
<td>The color to use.<br /> </td>
</tr>
</tbody>
</table><a name="1"></a>
<h3>Changing the color of a pixel</h3>
<div class="code">
<p class="cpp">TCODColor TCODImage<span class="code-symbol">::</span>putPixel<span
class="code-symbol">(</span><span class="code-keyword">int</span> x<span class="code-symbol">,</span><span
class="code-keyword"> int</span> y<span class="code-symbol">,</span><span class="code-keyword"> const</span>
TCODColor col<span class="code-symbol">)</span></p>
<p class="c"><span class="code-keyword">void</span> TCOD_image_put_pixel<span class="code-symbol">(</span><span
class="code-tcod">TCOD_image_t</span> image<span class="code-symbol">,</span><span
class="code-keyword">int</span> x<span class="code-symbol">,</span><span class="code-keyword"> int</span>
y<span class="code-symbol">,</span><span class="code-tcod">TCOD_color_t</span> col<span
class="code-symbol">)</span></p>
<p class="py">image_put_pixel<span class="code-symbol">(</span>image<span class="code-symbol">,</span>x<span
class="code-symbol">,</span> y<span class="code-symbol">,</span>col<span class="code-symbol">)</span></p>
</div>
<table class="param">
<tbody>
<tr>
<th>Parameter</th>
<th>Description</th>
</tr>
<tr class="hilite">
<td>image</td>
<td>In the C version, the image handler, obtained with the load function.<br /> </td>
</tr>
<tr>
<td>x,y</td>
<td>The pixel coordinates inside the image.<br /> 0
<= x < width<br /> 0
<= y < height<br />
</td>
</tr>
<tr class="hilite">
<td>col</td>
<td>The new color of the pixel.<br /> </td>
</tr>
</tbody>
</table><a name="2"></a>
<h3>Scaling an image</h3>
<p>You can resize an image and scale its content. If neww
< oldw or newh < oldh, supersampling is used to scale down the image. Else the image is scaled up using nearest
neightbor.<br />
</p>
<div class="code">
<p class="cpp"><span class="code-keyword">void</span> TCODImage<span class="code-symbol">::</span>scale<span
class="code-symbol">(</span><span class="code-keyword">int</span> neww<span
class="code-symbol">,</span><span class="code-keyword"> int</span> newh<span class="code-symbol">)</span>
</p>
<p class="c"><span class="code-keyword">void</span> TCOD_image_scale<span class="code-symbol">(</span><span
class="code-tcod">TCOD_image_t</span> image<span class="code-symbol">,</span><span
class="code-keyword">int</span> neww<span class="code-symbol">,</span><span class="code-keyword"> int</span>
newh<span class="code-symbol">)</span></p>
<p class="py">image_scale<span class="code-symbol">(</span>image<span class="code-symbol">,</span> neww<span
class="code-symbol">,</span>newh<span class="code-symbol">)</span></p>
</div>
<table class="param">
<tbody>
<tr>
<th>Parameter</th>
<th>Description</th>
</tr>
<tr class="hilite">
<td>image</td>
<td>In the C and Python version, the image handler, obtained with the load function.<br /> </td>
</tr>
<tr>
<td>neww,newh</td>
<td>The new size of the image.<br /> </td>
</tr>
</tbody>
</table><a name="3"></a>
<h3>Flipping the image horizontally</h3>
<div class="code">
<p class="cpp"><span class="code-keyword">void</span> TCODImage<span class="code-symbol">::</span>hflip<span
class="code-symbol">(</span><span class="code-symbol">)</span></p>
<p class="c"><span class="code-keyword">void</span> TCOD_image_hflip<span class="code-symbol">(</span><span
class="code-tcod">TCOD_image_t</span> image<span class="code-symbol">)</span></p>
<p class="py">image_hflip<span class="code-symbol">(</span>image<span class="code-symbol">)</span></p>
</div>
<table class="param">
<tbody>
<tr>
<th>Parameter</th>
<th>Description</th>
</tr>
<tr class="hilite">
<td>image</td>
<td>In the C and Python version, the image handler, obtained with the load function.<br /> </td>
</tr>
</tbody>
</table><a name="4"></a>
<h3>Flipping the image vertically</h3>
<div class="code">
<p class="cpp"><span class="code-keyword">void</span> TCODImage<span class="code-symbol">::</span>vflip<span
class="code-symbol">(</span><span class="code-symbol">)</span></p>
<p class="c"><span class="code-keyword">void</span> TCOD_image_vflip<span class="code-symbol">(</span><span
class="code-tcod">TCOD_image_t</span> image<span class="code-symbol">)</span></p>
<p class="py">image_vflip<span class="code-symbol">(</span>image<span class="code-symbol">)</span></p>
</div>
<table class="param">
<tbody>
<tr>
<th>Parameter</th>
<th>Description</th>
</tr>
<tr class="hilite">
<td>image</td>
<td>In the C and Python version, the image handler, obtained with the load function.<br /> </td>
</tr>
</tbody>
</table><a name="5"></a>
<h3>Rotating the image clockwise</h3>
<p>Rotate the image clockwise by increment of 90 degrees. <br /> </p>
<div class="code">
<p class="cpp"><span class="code-keyword">void</span> TCODImage<span class="code-symbol">::</span>rotate90<span
class="code-symbol">(</span><span class="code-keyword">int</span> numRotations<span
class="code-symbol">=</span><span class="code-value">1</span><span class="code-symbol">)</span></p>
<p class="c"><span class="code-keyword">void</span> TCOD_image_rotate90<span class="code-symbol">(</span><span
class="code-tcod">TCOD_image_t</span> image<span class="code-symbol">,</span><span class="code-keyword">
int</span> numRotations<span class="code-symbol">)</span></p>
<p class="py">image_rotate90<span class="code-symbol">(</span>image<span class="code-symbol">,</span> num<span
class="code-symbol">=</span><span class="code-value">1</span><span class="code-symbol">)</span></p>
</div>
<table class="param">
<tbody>
<tr>
<th>Parameter</th>
<th>Description</th>
</tr>
<tr class="hilite">
<td>image</td>
<td>In the C and Python version, the image handler, obtained with the load function.<br /> </td>
</tr>
<tr>
<td>numRotations</td>
<td>Number of 90 degrees rotations. Should be between 1 and 3.<br /> </td>
</tr>
</tbody>
</table><a name="6"></a>
<h3>Inverting the colors of the image</h3>
<div class="code">
<p class="cpp"><span class="code-keyword">void</span> TCODImage<span class="code-symbol">::</span>invert<span
class="code-symbol">(</span><span class="code-symbol">)</span></p>
<p class="c"><span class="code-keyword">void</span> TCOD_image_invert<span class="code-symbol">(</span><span
class="code-tcod">TCOD_image_t</span> image<span class="code-symbol">)</span></p>
<p class="py">image_invert<span class="code-symbol">(</span>image<span class="code-symbol">)</span></p>
</div>
<table class="param">
<tbody>
<tr>
<th>Parameter</th>
<th>Description</th>
</tr>
<tr class="hilite">
<td>image</td>
<td>In the C and Python version, the image handler, obtained with the load function.<br /> </td>
</tr>
</tbody>
</table>
</div>
</div>
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