* $graph = new ezcGraphLineChart(); * $graph->title = 'The power of x'; * $graph->legend->position = ezcGraph::BOTTOM; * * $graph->xAxis = new ezcGraphChartElementNumericAxis(); * $graph->yAxis = new ezcGraphChartElementLogarithmicalAxis(); * * $graph->data['x^2'] = new ezcGraphNumericDataSet( * -10, 10, * create_function( '$x', 'return pow( $x, 2 ) + 1;' ) * ); * * $graph->data['x^4'] = new ezcGraphNumericDataSet( * -10, 10, * create_function( '$x', 'return pow( $x, 4 ) + 1;' ) * ); * * $graph->data['x^6'] = new ezcGraphNumericDataSet( * -10, 10, * create_function( '$x', 'return pow( $x, 6 ) + 1;' ) * ); * * $graph->render( 400, 250, 'tutorial_axis_logarithmic.svg' ); * * * @property float $base * Base for logarithmical scaling. * @property string $logarithmicalFormatString * Sprintf formatstring for the axis labels where * $1 is the base and * $2 is the exponent. * @property-read float $minValue * Minimum Value to display on this axis. * @property-read float $maxValue * Maximum value to display on this axis. * * @version //autogentag// * @package Graph * @mainclass */ class ezcGraphChartElementLogarithmicalAxis extends ezcGraphChartElementAxis { /** * Constant used for calculation of automatic definition of major scaling * steps */ const MAX_STEPS = 9; /** * Constructor * * @param array $options Default option array * @return void * @ignore */ public function __construct( array $options = array() ) { $this->properties['min'] = null; $this->properties['max'] = null; $this->properties['base'] = 10; $this->properties['logarithmicalFormatString'] = '%1$d^%2$d'; $this->properties['minValue'] = null; $this->properties['maxValue'] = null; parent::__construct( $options ); } /** * __set * * @param mixed $propertyName * @param mixed $propertyValue * @throws ezcBaseValueException * If a submitted parameter was out of range or type. * @throws ezcBasePropertyNotFoundException * If a the value for the property options is not an instance of * @return void * @ignore */ public function __set( $propertyName, $propertyValue ) { switch ( $propertyName ) { case 'min': case 'max': if ( !is_numeric( $propertyValue ) ) { throw new ezcBaseValueException( $propertyName, $propertyValue, 'float' ); } $this->properties[$propertyName] = (float) $propertyValue; $this->properties['initialized'] = true; break; case 'base': if ( !is_numeric( $propertyValue ) || ( $propertyValue <= 0 ) ) { throw new ezcBaseValueException( $propertyName, $propertyValue, 'float > 0' ); } $this->properties[$propertyName] = (float) $propertyValue; break; case 'logarithmicalFormatString': $this->properties['logarithmicalFormatString'] = (string) $propertyValue; break; default: parent::__set( $propertyName, $propertyValue ); break; } } /** * Add data for this axis * * @param array $values Value which will be displayed on this axis * @return void */ public function addData( array $values ) { foreach ( $values as $value ) { if ( $this->properties['minValue'] === null || $value < $this->properties['minValue'] ) { $this->properties['minValue'] = $value; } if ( $this->properties['maxValue'] === null || $value > $this->properties['maxValue'] ) { $this->properties['maxValue'] = $value; } } $this->properties['initialized'] = true; } /** * Calculate axis bounding values on base of the assigned values * * @abstract * @access public * @return void */ public function calculateAxisBoundings() { // Prevent division by zero, when min == max if ( $this->properties['minValue'] == $this->properties['maxValue'] ) { if ( $this->properties['minValue'] == 0 ) { $this->properties['maxValue'] = 1; } else { $this->properties['minValue'] -= ( $this->properties['minValue'] * .1 ); $this->properties['maxValue'] += ( $this->properties['maxValue'] * .1 ); } } if ( $this->properties['minValue'] <= 0 ) { throw new ezcGraphOutOfLogithmicalBoundingsException( $this->properties['minValue'] ); } // Use custom minimum and maximum if available if ( $this->properties['min'] !== null ) { $this->properties['minValue'] = pow( $this->properties['base'], $this->properties['min'] ); } if ( $this->properties['max'] !== null ) { $this->properties['maxValue'] = pow( $this->properties['base'], $this->properties['max'] ); } // Calculate "nice" values for scaling parameters if ( $this->properties['min'] === null ) { $this->properties['min'] = floor( log( $this->properties['minValue'], $this->properties['base'] ) ); } if ( $this->properties['max'] === null ) { $this->properties['max'] = ceil( log( $this->properties['maxValue'], $this->properties['base'] ) ); } $this->properties['minorStep'] = 1; if ( ( $modifier = ( ( $this->properties['max'] - $this->properties['min'] ) / self::MAX_STEPS ) ) > 1 ) { $this->properties['majorStep'] = $modifier = ceil( $modifier ); $this->properties['min'] = floor( $this->properties['min'] / $modifier ) * $modifier; $this->properties['max'] = floor( $this->properties['max'] / $modifier ) * $modifier; } else { $this->properties['majorStep'] = 1; } } /** * Get coordinate for a dedicated value on the chart * * @param float $value Value to determine position for * @return float Position on chart */ public function getCoordinate( $value ) { // Force typecast, because ( false < -100 ) results in (bool) true $floatValue = (float) $value; if ( $value === false ) { switch ( $this->position ) { case ezcGraph::LEFT: case ezcGraph::TOP: return 0.; case ezcGraph::RIGHT: case ezcGraph::BOTTOM: return 1.; } } else { $position = ( log( $value, $this->properties['base'] ) - $this->properties['min'] ) / ( $this->properties['max'] - $this->properties['min'] ); switch ( $this->position ) { case ezcGraph::LEFT: case ezcGraph::TOP: return $position; case ezcGraph::RIGHT: case ezcGraph::BOTTOM: return 1 - $position; } } } /** * Return count of minor steps * * @return integer Count of minor steps */ public function getMinorStepCount() { return (int) ( ( $this->properties['max'] - $this->properties['min'] ) / $this->properties['minorStep'] ); } /** * Return count of major steps * * @return integer Count of major steps */ public function getMajorStepCount() { return (int) ( ( $this->properties['max'] - $this->properties['min'] ) / $this->properties['majorStep'] ); } /** * Get label for a dedicated step on the axis * * @param integer $step Number of step * @return string label */ public function getLabel( $step ) { if ( $this->properties['labelCallback'] !== null ) { return call_user_func_array( $this->properties['labelCallback'], array( sprintf( $this->properties['logarithmicalFormatString'], $this->properties['base'], $this->properties['min'] + ( $step * $this->properties['majorStep'] ) ), $step, ) ); } else { return sprintf( $this->properties['logarithmicalFormatString'], $this->properties['base'], $this->properties['min'] + ( $step * $this->properties['majorStep'] ) ); } } /** * Is zero step * * Returns true if the given step is the one on the initial axis position * * @param int $step Number of step * @return bool Status If given step is initial axis position */ public function isZeroStep( $step ) { return ( $step == 0 ); } } ?>