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<H3><A NAME="8_1_17">8.1.17 Adding plot marks to a line plot</A></H3>
<P> To emphasize the specific data points it is possible to add plot
 marks at each data point. Plot marks can be either</P>
<UL>
<LI> Simple shapes, (e.g. square, circle, cross, etc)</LI>
<LI> Arbitrary images loaded from a file</LI>
<LI> One of the built-in images</LI>
</UL>
<P> You access the plot mark through the &quot;mark&quot; instance variable in the
 plot, as in<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
&nbsp;$lineplot</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
mark</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">SetColor</FONT><FONT
color="#007700">(</FONT><FONT color="#DD0000">&quot;red&quot;</FONT><FONT color="#007700">
);</FONT><FONT color="#0000BB"></FONT></FONT></CODE></DIV></P>
<P> To choose between the different plot marks you call the <A href="../ref/PlotMark.html#_PLOTMARK_SETTYPE">
PlotMark::SetType()</A> method with the correct define to choose the
 plot type you want to use.</P>
<P> The simple shape type of plot marks are</P>
<UL>
<LI> MARK_SQUARE</LI>
<LI> MARK_UTRIANGLE</LI>
<LI> MARK_DTRIANGLE</LI>
<LI> MARK_DIAMOND</LI>
<LI> MARK_CIRCLE</LI>
<LI> MARK_FILLEDCIRCLE</LI>
<LI> MARK_CROSS</LI>
<LI> MARK_STAR</LI>
<LI> MARK_X</LI>
<LI> MARK_LEFTTRIANGLE</LI>
<LI> MARK_RIGHTTRIANGLE</LI>
<LI> MARK_FLASH</LI>
</UL>
<P> To specify an arbitrary image you use the special define</P>
<UL>
<LI> MARK_IMG</LI>
</UL>
<P> In this case you must also specify a image file name and an optional
 scaling constant. For example as in<DIV class="phpscript"><CODE><FONT color="#000000">
 <FONT color="#0000BB">&nbsp;$lineplot</FONT><FONT color="#007700">-&gt;</FONT><FONT
color="#0000BB">mark</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
SetTYPE</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
MARK_IMG</FONT><FONT color="#007700">,</FONT><FONT color="#DD0000">
&quot;myimage.jpg&quot;</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
1.5</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB"></FONT></FONT>
</CODE></DIV></P>
<P></P>
<P> If you want to use one of the built-in images the following images
 are available. Please note that not all images are available in all
 possible colors. The available colors for each image is listed below.</P>
<P> The following shape (the first class) plot marks are available</P>
<OL>
<LI>MARK_SQUARE, A filled square</LI>
<LI>MARK_UTRIANGLE, A triangle pointed upwards</LI>
<LI>MARK_DTRIANGLE, A triangle pointed downwards</LI>
<LI>MARK_DIAMOND, A diamond</LI>
<LI>MARK_CIRCLE, A circle</LI>
<LI>MARK_FILLEDCIRCLE, A filled circle</LI>
<LI>MARK_CROSS, A cross</LI>
<LI>MARK_STAR, A star</LI>
<LI>MARK_X, An 'X'</LI>
<LI>MARK_FLASH, A &quot;flash&quot; shape</LI>
<LI>MARK_IMAGE, Use the image specified with the filename and scale as
 the second and third argument as the mark.</LI>
</OL>
<P></P>
<P> For the second class (built-in images) the following table list the
 different images as well as what color they are available in. For the
 built-in images you specify the color with the second argument.</P>
<P> Note that some of the images are available in different sizes. The
 reason is that even though you can scale them by the third argument
 there is a visual degradation to scale an image larger than it's
 original size since some pixels needs to be interpolated. Reducing the
 size with a scale &lt; 1.0 gives much better visual apperance.</P>
<P> The scaling works with both GD 1 and GD 2 but with GD 2 the quality
 of the scaling is much better.</P>
<P> Built-in images and available colors:</P>
<TABLE border="1">
<TR><TH>Type</TH><TH>Description</TH><TH>Colors</TH></TR>
<TR><TD>MARK_IMG_PUSHPIN, MARK_IMG_SPUSHPIN</TD><TD> Push-pin image</TD><TD>
'red','blue','green','pink','orange'</TD></TR>
<TR><TD>MARK_IMG_LPUSHPIN</TD><TD> A larger Push-pin image</TD><TD>
'red','blue','green','pink','orange'</TD></TR>
<TR><TD>MARK_IMG_BALL, MARK_IMAGE_SBALL</TD><TD>A round 3D rendered ball</TD><TD>
'bluegreen','cyan','darkgray','greengray',
 'gray','graypurple','green','greenblue','lightblue',
 'lightred','navy','orange','purple','red','yellow'</TD></TR>
<TR><TD>MARK_IMAGE_MBALL</TD><TD>A medium sized round 3D rendered ball</TD><TD>
 'blue','bluegreen','brown','cyan',
 'darkgray','greengray','gray','green',
 'greenblue','lightblue','lightred', 'purple','red','white','yellow'</TD>
</TR>
<TR><TD>MARK_IMAGE_LBALL</TD><TD>A large sized round 3D rendered ball</TD><TD>
 'blue','lightblue','brown','darkgreen',
 'green','purple','red','gray','yellow','silver','gray'</TD></TR>
<TR><TD>MARK_IMAGE_SQUARE</TD><TD>A 3D rendered square</TD><TD>
'bluegreen','blue','green', 'lightblue','orange','purple','red','yellow'</TD>
</TR>
<TR><TD>MARK_IMG_STAR</TD><TD>A 3D rendered star image</TD><TD>
'bluegreen','lightblue','purple','blue','green','pink','red','yellow'</TD>
</TR>
<TR><TD>MARK_IMG_DIAMOND</TD><TD>A 3D rendered diamond</TD><TD>
'lightblue','darkblue','gray', 'blue','pink','purple','red','yellow'</TD>
</TR>
<TR><TD>MARK_IMG_BEVEL</TD><TD>A 3D rendered bevel style round ring</TD><TD>
'green','purple','orange','red','yellow'</TD></TR>
</TABLE>
 Below we give two examples of images using these features.<DIV class="example">
<BR> <A href="exframes/frame_imgmarkerex1.html" target="blank"><IMG border="0"
HEIGHT="200"  src="img/imgmarkerex1.png" WIDTH="300"></A>
<BR><B>Figure 27:</B> Using an arbitrary image as plot mark <A href="exframes/frame_imgmarkerex1.html"
target="blank">[src]</A>&nbsp;
<P></P>
</DIV>
<P></P>
<P><DIV class="example">
<BR> <A href="exframes/frame_builtinplotmarksex1.html" target="blank"><IMG
border="0" HEIGHT="200"  src="img/builtinplotmarksex1.png" WIDTH="350"></A>
<BR><B>Figure 28:</B> Using the built-in images <A href="exframes/frame_builtinplotmarksex1.html"
target="blank">[src]</A>&nbsp;
<P></P>
</DIV></P>
<P></P>
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