X-Git-Url: http://wagnertech.de/gitweb/gitweb.cgi/timetracker.git/blobdiff_plain/098a79f0819ebb89b7d48df4a6b154af4560f68e..9a23a8c0a51b7ec38a96f525484134f3cb85dc7e:/WEB-INF/lib/libchart/classes/view/axis/Axis.php

diff --git a/WEB-INF/lib/libchart/classes/view/axis/Axis.php b/WEB-INF/lib/libchart/classes/view/axis/Axis.php
new file mode 100644
index 00000000..88501963
--- /dev/null
+++ b/WEB-INF/lib/libchart/classes/view/axis/Axis.php
@@ -0,0 +1,130 @@
+<?php
+	/* Libchart - PHP chart library
+	 * Copyright (C) 2005-2008 Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
+	 * 
+	 * This program is free software: you can redistribute it and/or modify
+	 * it under the terms of the GNU General Public License as published by
+	 * the Free Software Foundation, either version 3 of the License, or
+	 * (at your option) any later version.
+	 * 
+	 * This program is distributed in the hope that it will be useful,
+	 * but WITHOUT ANY WARRANTY; without even the implied warranty of
+	 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	 * GNU General Public License for more details.
+	 *
+	 * You should have received a copy of the GNU General Public License
+	 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+	 * 
+	 */
+	
+	/**
+	 * Automatic axis boundaries and ticks calibration
+	 *
+	 * @author Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
+	 */
+	class Axis {
+		private $min;
+		private $max;
+		private $guide;
+		private $delta;
+		private $magnitude;
+		private $displayMin;
+		private $displayMax;
+		private $tics;
+	
+		/**
+		 * Creates a new axis formatter.
+		 *
+		 * @param integer minimum value on the axis
+		 * @param integer maximum value on the axis
+		 */
+		public function Axis($min, $max) {
+			$this->min = $min;
+			$this->max = $max;
+
+			$this->guide = 10;
+		}
+
+		/**
+		 * Computes value between two ticks.
+		 */
+		public function quantizeTics() {
+			// Approximate number of decades, in [1..10[
+			$norm = $this->delta / $this->magnitude;
+
+			// Approximate number of tics per decade
+			$posns = $this->guide / $norm;
+
+			if ($posns > 20) {
+				$tics = 0.05;		// e.g. 0, .05, .10, ...
+			} else if ($posns > 10) {
+				$tics = 0.2;		// e.g.  0, .1, .2, ...
+			} else if ($posns > 5) {
+				$tics = 0.4;		// e.g.  0, 0.2, 0.4, ...
+			} else if ($posns > 3) {
+				$tics = 0.5;		// e.g. 0, 0.5, 1, ...
+			} else if ($posns > 2) {
+				$tics = 1;		// e.g. 0, 1, 2, ...
+			} else if ($posns > 0.25) {
+				$tics = 2;		// e.g. 0, 2, 4, 6 
+			} else {
+				$tics = ceil($norm);
+			}
+			
+			$this->tics = $tics * $this->magnitude;
+		}
+
+		/**
+		 * Computes automatic boundaries on the axis
+		 */
+		public function computeBoundaries() {
+			// Range
+			$this->delta = abs($this->max - $this->min);
+
+			// Check for null distribution
+			if ($this->delta == 0)
+				$this->delta = 1;
+			
+			// Order of magnitude of range
+			$this->magnitude = pow(10, floor(log10($this->delta)));
+			
+			$this->quantizeTics();
+
+			$this->displayMin = floor($this->min / $this->tics) * $this->tics;
+			$this->displayMax = ceil($this->max / $this->tics) * $this->tics;
+			$this->displayDelta = $this->displayMax - $this->displayMin;
+		
+			// Check for null distribution
+			if ($this->displayDelta == 0) {
+				$this->displayDelta = 1;
+			}
+		}
+
+		/**
+		 * Get the lower boundary on the axis3
+		 *
+		 * @return integer lower boundary on the axis
+		 */
+		public function getLowerBoundary() {
+			return $this->displayMin;
+		}
+
+		/**
+		 * Get the upper boundary on the axis3
+		 *
+		 * @return integer upper boundary on the axis
+		 */
+		public function getUpperBoundary() {
+			return $this->displayMax;
+		}
+
+		/**
+		 * Get the value between two ticks3
+		 *
+		 * @return integer value between two ticks
+		 */
+		public function getTics() {
+			return $this->tics;
+		}
+	}
+?>
\ No newline at end of file