1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
|
<?php
/**
* File containing the abstract ezcGraphChartElementNumericAxis class
*
* @package Graph
* @version //autogentag//
* @copyright Copyright (C) 2005-2007 eZ systems as. All rights reserved.
* @license http://ez.no/licenses/new_bsd New BSD License
*/
/**
* Class to represent a numeric axis. The axis tries to calculate "nice" start
* and end values for the axis scale. The used interval is considered as nice,
* if it is equal to [1,2,5] * 10^x with x in [.., -1, 0, 1, ..].
*
* The start and end value are the next bigger / smaller multiple of the
* intervall compared to the maximum / minimum axis value.
*
* @property float $min
* Minimum value of displayed scale on axis.
* @property float $max
* Maximum value of displayed scale on axis.
* @property-read float $minValue
* Minimum Value to display on this axis.
* @property-read float $maxValue
* Maximum value to display on this axis.
*
* @package Graph
* @mainclass
*/
class ezcGraphChartElementNumericAxis extends ezcGraphChartElementAxis
{
/**
* Constant used for calculation of automatic definition of major scaling
* steps
*/
const MIN_MAJOR_COUNT = 5;
/**
* Constant used for automatic calculation of minor steps from given major
* steps
*/
const MIN_MINOR_COUNT = 8;
/**
* 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['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':
if ( !is_numeric( $propertyValue ) )
{
throw new ezcBaseValueException( $propertyName, $propertyValue, 'float' );
}
$this->properties['min'] = (float) $propertyValue;
break;
case 'max':
if ( !is_numeric( $propertyValue ) )
{
throw new ezcBaseValueException( $propertyName, $propertyValue, 'float' );
}
$this->properties['max'] = (float) $propertyValue;
break;
default:
parent::__set( $propertyName, $propertyValue );
break;
}
}
/**
* Returns a "nice" number for a given floating point number.
*
* Nice numbers are steps on a scale which are easily recognized by humans
* like 0.5, 25, 1000 etc.
*
* @param float $float Number to be altered
* @return float Nice number
*/
protected function getNiceNumber( $float )
{
// Get absolute value and save sign
$abs = abs( $float );
$sign = $float / $abs;
// Normalize number to a range between 1 and 10
$log = (int) round( log10( $abs ), 0 );
$abs /= pow( 10, $log );
// find next nice number
if ( $abs > 5 )
{
$abs = 10.;
}
elseif ( $abs > 2.5 )
{
$abs = 5.;
}
elseif ( $abs > 1 )
{
$abs = 2.5;
}
else
{
$abs = 1;
}
// unnormalize number to original values
return $abs * pow( 10, $log ) * $sign;
}
/**
* Calculate minimum value for displayed axe basing on real minimum and
* major step size
*
* @param float $min Real data minimum
* @param float $max Real data maximum
* @return void
*/
protected function calculateMinimum( $min, $max )
{
$this->properties['min'] = floor( $min / $this->properties['majorStep'] ) * $this->properties['majorStep'];
}
/**
* Calculate maximum value for displayed axe basing on real maximum and
* major step size
*
* @param float $min Real data minimum
* @param float $max Real data maximum
* @return void
*/
protected function calculateMaximum( $min, $max )
{
$this->properties['max'] = ceil( $max / $this->properties['majorStep'] ) * $this->properties['majorStep'];
}
/**
* Calculate size of minor steps based on the size of the major step size
*
* @param float $min Real data minimum
* @param float $max Real data maximum
* @return void
*/
protected function calculateMinorStep( $min, $max )
{
$stepSize = $this->properties['majorStep'] / self::MIN_MINOR_COUNT;
$this->properties['minorStep'] = $this->getNiceNumber( $stepSize );
}
/**
* Calculate size of major step based on the span to be displayed and the
* defined MIN_MAJOR_COUNT constant.
*
* @param float $min Real data minimum
* @param float $max Real data maximum
* @return void
*/
protected function calculateMajorStep( $min, $max )
{
$span = $max - $min;
$stepSize = $span / self::MIN_MAJOR_COUNT;
$this->properties['majorStep'] = $this->getNiceNumber( $stepSize );
}
/**
* Add data for this axis
*
* @param mixed $value 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;
}
}
}
/**
* 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
{
if ( $this->properties['majorStep'] !== null )
{
$this->properties['minValue'] -= $this->properties['majorStep'];
$this->properties['maxValue'] += $this->properties['majorStep'];
}
else
{
$this->properties['minValue'] -= ( $this->properties['minValue'] * .1 );
$this->properties['maxValue'] += ( $this->properties['maxValue'] * .1 );
}
}
}
// Use custom minimum and maximum if available
if ( $this->properties['min'] !== null )
{
$this->properties['minValue'] = $this->properties['min'];
}
if ( $this->properties['max'] !== null )
{
$this->properties['maxValue'] = $this->properties['max'];
}
// Calculate "nice" values for scaling parameters
if ( $this->properties['majorStep'] === null )
{
$this->calculateMajorStep( $this->properties['minValue'], $this->properties['maxValue'] );
}
if ( $this->properties['minorStep'] === null )
{
$this->calculateMinorStep( $this->properties['minValue'], $this->properties['maxValue'] );
}
if ( $this->properties['min'] === null )
{
$this->calculateMinimum( $this->properties['minValue'], $this->properties['maxValue'] );
}
if ( $this->properties['max'] === null )
{
$this->calculateMaximum( $this->properties['minValue'], $this->properties['maxValue'] );
}
}
/**
* Get coordinate for a dedicated value on the chart
*
* @param ezcGraphBounding $boundings
* @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 ) &&
( ( $floatValue < $this->properties['min'] ) || ( $floatValue > $this->properties['max'] ) ) )
{
switch ( $this->position )
{
case ezcGraph::LEFT:
case ezcGraph::TOP:
return 0.;
case ezcGraph::RIGHT:
case ezcGraph::BOTTOM:
return 1.;
}
}
else
{
switch ( $this->position )
{
case ezcGraph::LEFT:
case ezcGraph::TOP:
return ( $value - $this->properties['min'] ) / ( $this->properties['max'] - $this->properties['min'] );
case ezcGraph::RIGHT:
case ezcGraph::BOTTOM:
return 1 - ( $value - $this->properties['min'] ) / ( $this->properties['max'] - $this->properties['min'] );
}
}
}
/**
* 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 )
{
return $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 ( $this->getLabel( $step ) == 0 );
}
}
?>
|