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130 lines
3.2 KiB
PHP
130 lines
3.2 KiB
PHP
<?php
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/* Libchart - PHP chart library
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* Copyright (C) 2005-2010 Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/**
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* Automatic axis boundaries and ticks calibration
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*
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* @author Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
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*/
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class Axis {
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private $min;
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private $max;
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private $guide;
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private $delta;
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private $magnitude;
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private $displayMin;
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private $displayMax;
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private $tics;
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/**
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* Creates a new axis formatter.
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*
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* @param integer minimum value on the axis
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* @param integer maximum value on the axis
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*/
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public function Axis($min, $max) {
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$this->min = $min;
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$this->max = $max;
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$this->guide = 10;
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}
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/**
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* Computes value between two ticks.
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*/
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public function quantizeTics() {
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// Approximate number of decades, in [1..10[
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$norm = $this->delta / $this->magnitude;
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// Approximate number of tics per decade
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$posns = $this->guide / $norm;
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if ($posns > 20) {
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$tics = 0.05; // e.g. 0, .05, .10, ...
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} else if ($posns > 10) {
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$tics = 0.2; // e.g. 0, .1, .2, ...
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} else if ($posns > 5) {
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$tics = 0.4; // e.g. 0, 0.2, 0.4, ...
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} else if ($posns > 3) {
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$tics = 0.5; // e.g. 0, 0.5, 1, ...
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} else if ($posns > 2) {
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$tics = 1; // e.g. 0, 1, 2, ...
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} else if ($posns > 0.25) {
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$tics = 2; // e.g. 0, 2, 4, 6
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} else {
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$tics = ceil($norm);
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}
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$this->tics = $tics * $this->magnitude;
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}
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/**
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* Computes automatic boundaries on the axis
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*/
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public function computeBoundaries() {
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// Range
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$this->delta = abs($this->max - $this->min);
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// Check for null distribution
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if ($this->delta == 0)
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$this->delta = 1;
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// Order of magnitude of range
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$this->magnitude = pow(10, floor(log10($this->delta)));
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$this->quantizeTics();
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$this->displayMin = floor($this->min / $this->tics) * $this->tics;
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$this->displayMax = ceil($this->max / $this->tics) * $this->tics;
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$this->displayDelta = $this->displayMax - $this->displayMin;
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// Check for null distribution
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if ($this->displayDelta == 0) {
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$this->displayDelta = 1;
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}
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}
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/**
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* Get the lower boundary on the axis3
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*
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* @return integer lower boundary on the axis
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*/
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public function getLowerBoundary() {
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return $this->displayMin;
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}
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/**
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* Get the upper boundary on the axis3
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*
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* @return integer upper boundary on the axis
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*/
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public function getUpperBoundary() {
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return $this->displayMax;
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}
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/**
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* Get the value between two ticks3
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*
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* @return integer value between two ticks
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*/
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public function getTics() {
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return $this->tics;
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}
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}
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?>
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