Blame | Letzte Änderung | Log anzeigen | RSS feed
<style type="text/css"><!--A:link {font-family: helvetica, arial, geneva, sans-serif; font-size: x-small; text-decoration: none; color: #0000ff}A:visited {font-family: helvetica, arial, geneva, sans-serif; font-size: x-small; text-decoration: none; color: #0000ff}A:hover {font-family: helvetica, arial, geneva, sans-serif; font-size: x-small; text-decoration: underline; color: #FF0000}th {font-family: helvetica, arial; color : blue; font-size:85%; background : lightgrey; border-right:black solid 1pt; border-bottom:black solid 1pt;}//--></style><hr><a name="_C_FUNCGENERATOR"><div style="background-color:yellow;font-family:courier new;"></a>CLASS <b>FuncGenerator</b></div><i>(Defined in: jpgraph.php : 676)</i><table border=1><tr><td> <a href="FuncGenerator.html" style="font-family:arial;font-weight:bold;color:darkblue;">FuncGenerator</a> </td></tr><tr><td valign=top> <a href="FuncGenerator.html#_FUNCGENERATOR_E">E()</a> <br> <a href="FuncGenerator.html#_FUNCGENERATOR_FUNCGENERATOR">FuncGenerator()</a> <br></td></tr></table> <p><div style="font-weight:bold;font-family:arial;font-size:100%;">Class usage and Overview</div>A utility class to help with function plots. This class supprots both ordinary one-variable plots with one dependent variable as well as polar plots.Basically you create an instance of this class with the function you want to plot as a string argument. The function should be created using 'x' as the independent variable. You then invoke its evaluation method 'E()' with the range for the independent variable and possibly a step size. The method then returns an array of X, and Y values that represents the plot.Please remember that the string should be specified with single quotes since otherwise PHP will try to interpret the variable in the string.For example, to specify a simple cos() plot you specify:$f = new FuncGenerator('cos($x)';<p> <hr><span style="font-family:arial;font-size:120%;font-weight:bold;">Class Methods</span><hr><p><p> <p> <span style='font-size:110%;'><a name="_FUNCGENERATOR_E"><div style="border-top:solid black 2pt;background-color:lightblue;font-family:courier new;font-size:90%;font-weight:bold;"><b><font color="#000000">function E($aXMin,$aXMax,$aSteps)</font></b></div></a></span><span style='font-family:arial;font-size:90%;'><i>Evaluate a X-Y function</i></span><p><table cellspacing=0 style='border:black solid 1pt;' width=100%><tr><th width=25%>Argument</th><th width=15%>Default</th><th width=60%>Description</th></tr><tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">$aXMin</font></td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'> </td><td>Min x-value</td></tr><tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">$aXMax</font></td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'> </td><td>Max x-value</td></tr><tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">$aSteps</font></td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">50</font></td><td>Number of steps</td></tr></table><div style="font-weight:bold;font-family:arial;font-size:85%;">Description</div>Evaluate the previous specified function between the specified values. The return two arrays representing the X and Y coordinates for the function. <br><div style="font-weight:bold;font-family:arial;font-size:85%;"><p>Example</div><span style="font-family:courier;font-size:85%;"><font color="#000000">// Create a simple linear plot <br />$f = new FuncGenerator('cos($x) * sin($x)'); <br />list($xdata,$ydata) = $f->E(-2*M_PI, 2*M_PI); <br /> <br />$lp1 = new LinePlot($ydata,$xdata); <br /> <br />// Create a simple polar plot (a circle) <br />$p = new FuncGenerator('cos($i)', 'sin($i)'); <br />list($x2data,$y2data) = $f->E(-2*M_PI, 2*M_PI); <br /> <br />$lp2 = new LinePlot($y2data,$x2data); <br /> <br />//...</font></span><br><p><p> <p> <span style='font-size:110%;'><a name="_FUNCGENERATOR_FUNCGENERATOR"><div style="border-top:solid black 2pt;background-color:lightblue;font-family:courier new;font-size:90%;font-weight:bold;"><b><font color="#000000">function FuncGenerator($aFunc,$aXFunc)</font></b></div></a></span><span style='font-family:arial;font-size:90%;'><i>Create a new function generator.</i></span><p><table cellspacing=0 style='border:black solid 1pt;' width=100%><tr><th width=25%>Argument</th><th width=15%>Default</th><th width=60%>Description</th></tr><tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">$aFunc</font></td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'> </td><td>Function</td></tr><tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">$aXFunc</font></td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">''</font></td><td>X-Function</td></tr></table><div style="font-weight:bold;font-family:arial;font-size:85%;">Description</div>Creates a new funciton generator. You can create both a linear plot as well as polar plot.For linear, one-variable plots, you must use '$x' as the independent variable.For polar plots you should use the index '$i' for the generating functions. <br><div style="font-weight:bold;font-family:arial;font-size:85%;"><p>Example</div><span style="font-family:courier;font-size:85%;"><font color="#000000">// Create a simple linear plot <br />$f = new FuncGenerator('cos($x) * sin($x)'); <br />list($xdata,$ydata) = $f->E(-2*M_PI, 2*M_PI); <br /> <br />$lp1 = new LinePlot($ydata,$xdata); <br /> <br />// Create a simple polar plot (a circle) <br />$p = new FuncGenerator('cos($i)', 'sin($i)'); <br />list($x2data,$y2data) = $f->E(-2*M_PI, 2*M_PI); <br /> <br />$lp2 = new LinePlot($y2data,$x2data); <br /> <br />//... <br /></font></span><br><p> <hr> <p>