Merge pull request #587 from nyalldawson/new_functions

New functions

resources/function_help/abs-en_US

@@ -0,0 +1,12 @@
+<h3>abs() function</h3>
+Returns the absolute value of a number.<br>
+
+
+<h4>Syntax</h4>
+abs(<i>value</i>)<br>
+
+<h4>Arguments</h4>
+<code>value</code> - a number.<br>
+
+<h4>Example</h4>
+<code>abs(-2) &rarr; 2</code><br>

resources/function_help/ceil-en_US

@@ -0,0 +1,14 @@
+<h3>Function ceil()</h3>
+Rounds a number upwards.
+
+<h4>Syntax</h4>
+<code>ceil(value)</code><br>
+
+<h4>Arguments</h4>
+<code>value</code> - a number.
+<br>
+
+<h4>Example</h4>
+<!-- Show example of function.-->
+<code>ceil(4.9) &rarr; 5</code><br>
+<code>ceil(-4.9) &rarr; -4</code><br>

resources/function_help/floor-en_US

@@ -0,0 +1,14 @@
+<h3>Function floor()</h3>
+Rounds a number downwards.
+
+<h4>Syntax</h4>
+<code>floor(value)</code><br>
+
+<h4>Arguments</h4>
+<code>value</code> - a number.
+<br>
+
+<h4>Example</h4>
+<!-- Show example of function.-->
+<code>floor(4.9) &rarr; 4</code><br>
+<code>floor(-4.9) &rarr; -5</code><br>

resources/function_help/log-en_US

@@ -6,7 +6,7 @@ This function takes two arguments.
 <code>log(base, value)</code><br>
 
 <h4>Arguments</h4>
-<code>base</code> - any positive number.
+<code>base</code> - any positive number.<br>
 <code>value</code> - any positive number.
 <br>
 

resources/function_help/max-en_US

@@ -0,0 +1,13 @@
+<h3>max() function</h3>
+Returns the largest value in a set of values.
+
+<h4>Syntax</h4>
+     max(<i>value<i>[,<i>value</i>...])
+
+<h4>Arguments</h4>
+<!-- List args for functions here-->
+<i>  value</i> &rarr; a number.<br>
+
+<h4>Example</h4>
+<!-- Show example of function.-->
+     max(2,10.2,5.5) &rarr; 10.2

resources/function_help/min-en_US

@@ -0,0 +1,13 @@
+<h3>min() function</h3>
+Returns the smallest value in a set of values.
+
+<h4>Syntax</h4>
+     min(<i>value<i>[,<i>value</i>...])
+
+<h4>Arguments</h4>
+<!-- List args for functions here-->
+<i>  value</i> &rarr; a number.<br>
+
+<h4>Example</h4>
+<!-- Show example of function.-->
+     min(20.5,10,6.2) &rarr; 6.2

resources/function_help/rand-en_US

@@ -0,0 +1,16 @@
+<h3>rand() function</h3>
+Returns a random integer within the range specified by the minimum and 
+maximum argument (inclusive).
+<br>
+This function takes two arguments.
+<h4>Syntax</h4>
+<code>rand(min, max)</code><br>
+
+<h4>Arguments</h4>
+<code>min</code> - an integer representing the smallest possible random number desired.<br>
+<code>max</code> - an integer representing the largest possible random number desired.
+<br>
+
+<h4>Example</h4>
+<!-- Show example of function.-->
+<code>rand(1, 10) &rarr; 8</code><br>

resources/function_help/randf-en_US

@@ -0,0 +1,16 @@
+<h3>rand() function</h3>
+Returns a random float within the range specified by the minimum and 
+maximum argument (inclusive).
+<br>
+This function takes two arguments.
+<h4>Syntax</h4>
+<code>randf(min, max)</code><br>
+
+<h4>Arguments</h4>
+<code>min</code> - a float representing the smallest possible random number desired.<br>
+<code>max</code> - a float representing the largest possible random number desired.
+<br>
+
+<h4>Example</h4>
+<!-- Show example of function.-->
+<code>randf(1, 10) &rarr; 4.59258286403147</code><br>

resources/function_help/regexp_substr-en_US

@@ -0,0 +1,14 @@
+<h3>regexp_substr() function</h3>
+Returns the portion of a string which matches a supplied regular expression.
+
+<p><h4>Syntax</h4>
+     regexp_substr(<i>string,regex</i>)</p>
+
+<p><h4>Arguments</h4>
+<!-- List args for functions here-->
+<i>  string</i> &rarr; is string.  The input string.<br>
+<i>  regex</i> &rarr; is string.  The regular expression to match against. Backslash characters must be double escaped (eg "\\s" to match a white space character).<br>
+
+<p><h4>Example</h4>
+<!-- Show example of function.-->
+     regexp_substr('abc123','(\\d+)') &rarr; '123'</p>

resources/function_help/right-en_US

@@ -7,7 +7,7 @@ Returns a substring that contains the <i>n</i> rightmost characters of the strin
 <h4>Arguments</h4>
 <code>string</code> - is string. The string.
 <br>
-<code>length</code> - is int. The numbder of characters from the right to return.
+<code>length</code> - is int. The number of characters from the right to return.
 
 <h4>Example</h4>
 <!-- Show example of function.-->

resources/function_help/scale_linear-en_US

@@ -0,0 +1,19 @@
+<h3>scale_linear() function</h3>
+Transforms a given value from an input domain to an output range using linear interpolation. 
+
+<p><h4>Syntax</h4>
+     scale_linear(<i>val</i>,<i>domain_min</i>,<i>domain_max</i>,<i>range_min</i>,<i>range_max</i>)</p>
+
+<p><h4>Arguments</h4>
+<!-- List args for functions here-->
+<i>  val</i> &rarr; is a value in the input domain. The function will return a corresponding scaled value in the output range.<br>
+<i>  domain_min, domain_max</i> &rarr; specify the input domain, the smallest and largest values the input <i>val</i> should take.<br>
+<i>  range_min, range_max</i> &rarr; sepcify the output range, the smallest and largest values which should be output by the function.<br>
+
+<h4>Example</h4>
+<!-- Show example of function.-->
+     scale_linear(5,0,10,0,100) &rarr; 50<br>
+     scale_linear(0.2,0,1,0,360) &rarr; 72 <i>(eg, scaling a value between 0 and 1 to an angle between 0 and 360)</i><br>
+     scale_linear(1500,1000,10000,9,20) &rarr; 10.22 <i>(eg, scaling a population which varies between 1000 and 10000 to a font size between 9 and 20)</i><br>
+
+

resources/function_help/trim-en_US

@@ -0,0 +1,13 @@
+<h3>trim() function</h3>
+Removes all leading and trailing whitespace (spaces, tabs, etc) from a string.
+
+<p><h4>Syntax</h4>
+     trim(<i>string</i>)</p>
+
+<p><h4>Arguments</h4>
+<!-- List args for functions here-->
+<i>  string</i> &rarr; is string. The string to trim.</p>
+
+<p><h4>Example</h4>
+<!-- Show example of function.-->
+     trim('   hello world    ') &rarr; 'hello world'</p>

src/app/main.cpp

@@ -294,6 +294,9 @@ int main( int argc, char *argv[] )
   SetUnhandledExceptionFilter( qgisCrashDump );
 #endif
 
+  // initialize random number seed
+  srand( time( NULL ) );
+
   /////////////////////////////////////////////////////////////////
   // Command line options 'behaviour' flag setup
   ////////////////////////////////////////////////////////////////