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Adam Amstrong
7249a1d947
git-svn-id: http://www.observium.org/svn/observer/trunk@358 61d68cd4-352d-0410-923a-c4978735b2b8
91 lines
7.5 KiB
HTML
91 lines
7.5 KiB
HTML
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</style><hr><a name="_C_BEZIER"><div style="background-color:yellow;font-family:courier new;"></a>CLASS <b>Bezier</b></div>
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<i>(Defined in: jpgraph_regstat.php : 112)</i><table border=1><tr><td> <a href="Bezier.html" style="font-family:arial;font-weight:bold;color:darkblue;">Bezier</a> </td></tr><tr><td valign=top> <a href="Bezier.html#_BEZIER_BEZIER">Bezier()</a> <br>
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<a href="Bezier.html#_BEZIER_GET">Get()</a> <br>
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</td></tr></table> <p><div style="font-weight:bold;font-family:arial;font-size:100%;">Class usage and Overview</div>Utility class to help construct an interpolated data points given an arbitrary number of data points.
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<p>
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This class doesn't draw any graphs by itself it is only used to generate a new set of data points representing the smooth line from the input which are the control lines for a bezier interpolated curve.
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<p>
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The principle of using this class is that you first create an instance of this class and giving it the X,Y values for your control points.
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<p>
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You can then get back an interpolated smooth dataset by calling the Get() method. This method takeas as argument how many data points you want the interpolated graph to have.
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<p>
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In order to use this method the file jpgraph_regstat.php must be included.
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<p>
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Technical note: The control points for a bezier curve does not necessary lie on the curve. Using the alternative method of spline interpolation guarantees that the specified control point lie on the generated curve.
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<p>
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Technical note 2: An alternmative Bezier curve is also availabe in the Canvas tools (jpgraph_canvtools.php). The difference is that that method will not return any data points it will directly draw an interpolate bezier curve on the canvas.
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<p>
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<div style="font-weight:bold;font-family:arial;font-size:85%;">See also related classes:</div><a href="Spline.html">Spline</a> and <a href="Shape.html">Shape</a> <p> <hr><span style="font-family:arial;font-size:120%;font-weight:bold;">Class Methods</span><hr><p>
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<p> <p> <span style='font-size:110%;'><a name="_BEZIER_BEZIER"><div style="border-top:solid black 2pt;background-color:lightblue;font-family:courier new;font-size:90%;font-weight:bold;"><b><font color="#000000">
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function Bezier($datax,$datay,$attraction_factor,,)</font>
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</b></div></a></span>
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<span style='font-family:arial;font-size:90%;'><i>Create a new bezier object</i></span><p>
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<table cellspacing=0 style='border:black solid 1pt;' width=100%>
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<tr><th width=25%>Argument</th><th width=15%>Default</th><th width=60%>Description</th></tr>
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<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
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$datax</font>
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</td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'> </td><td>X-coordinates for control points</td></tr>
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<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
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$datay</font>
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</td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'> </td><td>Y-coordinates for control points</td></tr>
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<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
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$attraction_factor</font>
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</td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'> </td><td>Attraction factor</td></tr>
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<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
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</font>
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</td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'> </td><td>No description available</td></tr>
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<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
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</font>
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</td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
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1</font>
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</td><td>No description available</td></tr>
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</table>
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<div style="font-weight:bold;font-family:arial;font-size:85%;">Description</div>Creates a new Bezier interpoaltion object. The arguments specifies the X, and Y coordinate sof the control points to be used.
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The attraction factor is an integer >1 and determines how much "gracity" each control point should have. A higher value makes the resulting curve bend much more sharper against the control points. The default value is 1. <br>
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<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">
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// Control points
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<br />$xdata = array(1,3,12,15);
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<br />$ydata = array(5,15,2,19);
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<br />
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<br />// Get the interpolated values by creating
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<br />// a new bezier object.
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<br />$bez = new Bezier($xdata,$ydata);
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<br />
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<br />// For the new data set we want 50 points to
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<br />// get a smooth curve.
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<br />list($newx,$newy) = $bez->Get(50);</font>
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</span><br>
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<p>
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<p> <p> <span style='font-size:110%;'><a name="_BEZIER_GET"><div style="border-top:solid black 2pt;background-color:lightblue;font-family:courier new;font-size:90%;font-weight:bold;"><b><font color="#000000">
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function Get($steps)</font>
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</b></div></a></span>
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<span style='font-family:arial;font-size:90%;'><i>Return two arrays of X and Y coordinates that represents the curve</i></span><p>
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<table cellspacing=0 style='border:black solid 1pt;' width=100%>
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<tr><th width=25%>Argument</th><th width=15%>Default</th><th width=60%>Description</th></tr>
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<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
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$steps</font>
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</td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'> </td><td>Number of data points</td></tr>
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</table>
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<div style="font-weight:bold;font-family:arial;font-size:85%;">Description</div>Return a data set representing the interpolated smooth curve passing through all the specified control points. <br>
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<br>
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<div style="font-weight:bold;font-family:arial;font-size:85%;">Returns</div>array($datax,$datay)<br>
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<div style="font-weight:bold;font-family:arial;font-size:85%;"><p>Example</div><span style="font-family:courier;font-size:85%;"><font color="#000000">
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// Control points for bezier curve
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<br />$xdata = array(1,3,12,15);
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<br />$ydata = array(5,15,2,19);
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<br />
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<br />// Get the interpolated values by creating
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<br />// a new Spline object.
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<br />$bez = new Bezier($xdata,$ydata);
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<br />
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<br />// For the new data set we want 50 points to
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<br />// get a smooth curve.
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<br />list($newx,$newy) = $bez->Get(50);
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<br /></font>
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</span><br>
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<p> <hr> <p> |