/**
* Set clipping to occur
*
* Parameter array:
*
* 'x0': int X point of Upper-left corner
* 'y0': int X point of Upper-left corner
* 'x1': int X point of lower-right corner
* 'y1': int Y point of lower-right corner
*/
function setClipping($params = false)
{
if ($params === false) {
$index = count($this->_clipping) - 1;
if (isset($this->_clipping[$index])) {
$params = $this->_clipping[$index];
$canvas = $params['canvas'];
ImageCopy($canvas, $this->_canvas, min($params['x0'], $params['x1']), min($params['y0'], $params['y1']), min($params['x0'], $params['x1']), min($params['y0'], $params['y1']), abs($params['x1'] - $params['x0'] + 1), abs($params['y1'] - $params['y0'] + 1));
$this->_canvas = $canvas;
unset($this->_clipping[$index]);
}
} else {
$params['canvas'] = $this->_canvas;
if ($this->_gd2) {
$this->_canvas = ImageCreateTrueColor($this->_width, $this->_height);
if ($this->_alpha) {
ImageAlphaBlending($this->_canvas, true);
}
} else {
$this->_canvas = ImageCreate($this->_width, $this->_height);
}
if ($this->_gd2 && $this->_antialias === 'native') {
ImageAntialias($this->_canvas, true);
}
ImageCopy($this->_canvas, $params['canvas'], 0, 0, 0, 0, $this->_width, $this->_height);
$this->_clipping[count($this->_clipping)] = $params;
}
}
/**
* Create the GD canvas.
*
* Parameters available:
*
* 'width' The width of the graph on the canvas
*
* 'height' The height of the graph on the canvas
*
* 'left' The left offset of the graph on the canvas
*
* 'top' The top offset of the graph on the canvas
*
* 'antialias' = 'native' enables native GD antialiasing - this
* method has no severe impact on performance (approx +5%). Requires PHP
* 4.3.2 (with bundled GD2)
*
* 'antialias' = {true|'driver'} Image_Graph implemented method. This method
* has a severe impact on performance, drawing an antialiased line this
* way is about XX times slower, with an overall performance impact of
* about +40%. The justification for this method is that if native support
* is not available this can be used, it is also a future feature that this
* method for antialiasing will support line styles.
*
* Use antialiased for best results with a line/area chart having just a few
* datapoints. Native antialiasing does not provide a good appearance with
* short lines, as for example with smoothed charts. Antialiasing does not
* (currently) work with linestyles, neither native nor driver method!
*
* 'noalpha' = true If alpha blending is to be disabled
*
* 'filename' An image to open, on which the graph is created on
*
* 'gd' A GD resource to add the image to, use this option to continue
* working on an already existing GD resource. Make sure this is passed 'by-
* reference' (using &)
*
* 'usemap' Initialize an image map
*
* 'gd' and 'filename' are mutually exclusive with 'gd' as preference
*
* 'width' and 'height' are required unless 'filename' or 'gd' are
* specified, in which case the width and height are taken as the actual
* image width/height. If the latter is the case and 'left' and/or 'top' was
* also specified, the actual 'width'/'height' are altered so that the graph
* fits inside the canvas (i.e 'height' = actual height - top, etc.)
*
* @param array $param Parameter array
*/
function Image_Canvas_GD($param)
{
include_once 'Image/Canvas/Color.php';
parent::Image_Canvas_WithMap($param);
$this->_gd2 = $this->_version() == 2;
$this->_font = array('font' => 1, 'color' => 'black');
if (isset($param['gd']) && is_resource($param['gd'])) {
$this->_canvas =& $param['gd'];
} elseif (isset($param['filename'])) {
$this->_canvas =& $this->_getGD($param['filename']);
} else {
if ($this->_gd2) {
$this->_canvas = ImageCreateTrueColor($this->_width, $this->_height);
if (!isset($param['noalpha']) || $param['noalpha'] !== true) {
ImageAlphaBlending($this->_canvas, true);
}
} else {
$this->_canvas = ImageCreate($this->_width, $this->_height);
}
}
if (isset($param['antialias'])) {
$this->_antialias = $param['antialias'];
}
if ($this->_antialias === true) {
$this->_antialias = 'driver';
}
if ($this->_gd2 && $this->_antialias === 'native') {
ImageAntialias($this->_canvas, true);
}
}
