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<HR NOSHADE>
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<H2><A NAME="9_3">9.3 A simple Gantt chart</A></H2>
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<P> Time to show you an example of a Gantt chart and how easy it is to
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make one. Lets make it the simplest possible Gantt chart. One activity,
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named "Project", which lasts from "2001-11-01" to "2002-02-20".</P>
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<P> All it takes to do this (using default values for everything) is the
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following code.<DIV class="phpscript">(File: ganttex00.php)
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<BR><CODE><FONT color="#000000"> <FONT color="#0000BB"><?php
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<BR></FONT><FONT color="#007700">include (</FONT><FONT color="#DD0000">
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"../jpgraph.php"</FONT><FONT color="#007700">);
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<BR>include (</FONT><FONT color="#DD0000">"../jpgraph_gantt.php"</FONT><FONT
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color="#007700">);
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<BR>
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<BR></FONT><FONT color="#FF8000">// A new graph with automatic size
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<BR></FONT><FONT color="#0000BB">$graph </FONT><FONT color="#007700">
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= new </FONT><FONT color="#0000BB">GanttGraph</FONT><FONT color="#007700">
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(</FONT><FONT color="#0000BB">0</FONT><FONT color="#007700">,</FONT><FONT
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color="#0000BB">0</FONT><FONT color="#007700">,</FONT><FONT color="#DD0000">
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"auto"</FONT><FONT color="#007700">);
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<BR>
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<BR></FONT><FONT color="#FF8000">// A new activity on row '0'
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<BR></FONT><FONT color="#0000BB">$activity </FONT><FONT color="#007700">
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= new </FONT><FONT color="#0000BB">GanttBar</FONT><FONT color="#007700">
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(</FONT><FONT color="#0000BB">0</FONT><FONT color="#007700">,</FONT><FONT
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color="#DD0000">"Project"</FONT><FONT color="#007700">,</FONT><FONT color="#DD0000">
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"2001-12-21"</FONT><FONT color="#007700">,</FONT><FONT color="#DD0000">
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"2002-01-20"</FONT><FONT color="#007700">);
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<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">Add</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
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$activity</FONT><FONT color="#007700">);
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<BR>
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<BR></FONT><FONT color="#FF8000">// Display the Gantt chart
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<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">Stroke</FONT><FONT color="#007700">();
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<BR></FONT><FONT color="#0000BB">?>
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<BR></FONT></FONT></CODE></DIV></P>
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<P> The resulting image is shown in Figure 147 below.<DIV style="margin-left:-120px;">
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<DIV class="example">
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<BR> <A href="exframes/frame_ganttex00.html" target="blank"><IMG border="0"
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HEIGHT="112" src="img/img/img/img/img/img/ganttex00.png" WIDTH="486"></A>
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<BR><B>Figure 147:</B> Your first simple Gantt chart. <A href="exframes/frame_ganttex00.html"
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target="blank">[src]</A>
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<P></P>
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</DIV>
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<P></P>
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</DIV></P>
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<P> Let's note a few things with the above image and code:</P>
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<UL>
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<LI> You always need to include both jpgraph.php and jpgraph_gantt.php</LI>
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<LI> A bar is specified a minimum of four parameters, vertical position
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(more about that in a second), a title, start and end date.</LI>
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<LI> If you don't specify a size for the image it will be automatically
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decided based on the min and max dates for the bars rounded to a full
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week.</LI>
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<LI> By default the week and day scale are displayed.</LI>
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<LI> Weekend background are displayed default in a slightly gray color</LI>
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<LI> Sundays are written in red.</LI>
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<LI> Weeks are numbered according to ISO 8601</LI>
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<LI> Activity bars are rendered as blue stripes on a white background by
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default.</LI>
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</UL>
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<P> So, lets start making this graph a little bit more interesting.
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First we are going to add a title, then we will add a month scale and
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finally we will change the color of the bar.</P>
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<P> All that is taken care of in the code below.<DIV class="phpscript">
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(File: ganttex01.php)
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<BR><CODE><FONT color="#000000"> <FONT color="#0000BB"><?php
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<BR></FONT><FONT color="#007700">include (</FONT><FONT color="#DD0000">
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"../jpgraph.php"</FONT><FONT color="#007700">);
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<BR>include (</FONT><FONT color="#DD0000">"../jpgraph_gantt.php"</FONT><FONT
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color="#007700">);
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<BR>
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<BR></FONT><FONT color="#0000BB">$graph </FONT><FONT color="#007700">
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= new </FONT><FONT color="#0000BB">GanttGraph</FONT><FONT color="#007700">
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(</FONT><FONT color="#0000BB">0</FONT><FONT color="#007700">,</FONT><FONT
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color="#0000BB">0</FONT><FONT color="#007700">,</FONT><FONT color="#DD0000">
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"auto"</FONT><FONT color="#007700">);
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<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">SetShadow</FONT><FONT color="#007700">();
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<BR>
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<BR></FONT><FONT color="#FF8000">// Add title and subtitle
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<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">title</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">
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Set</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
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"A nice main title"</FONT><FONT color="#007700">);
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<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">title</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">
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SetFont</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
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FF_ARIAL</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
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FS_BOLD</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">12</FONT><FONT
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color="#007700">);
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<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">subtitle</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">
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Set</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
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"(Draft version)"</FONT><FONT color="#007700">);
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<BR>
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<BR></FONT><FONT color="#FF8000">// Show day, week and month scale
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<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">ShowHeaders</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
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GANTT_HDAY </FONT><FONT color="#007700">| </FONT><FONT color="#0000BB">
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GANTT_HWEEK </FONT><FONT color="#007700">| </FONT><FONT color="#0000BB">
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GANTT_HMONTH</FONT><FONT color="#007700">);
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<BR>
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<BR></FONT><FONT color="#FF8000">
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// Instead of week number show the date for the first day in the week
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<BR>// on the week scale
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<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">scale</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">
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week</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">SetStyle</FONT><FONT
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color="#007700">(</FONT><FONT color="#0000BB">WEEKSTYLE_FIRSTDAY</FONT><FONT
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color="#007700">);
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<BR>
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<BR></FONT><FONT color="#FF8000">
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// Make the week scale font smaller than the default
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<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">scale</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">
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week</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">SetFont</FONT><FONT
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color="#007700">(</FONT><FONT color="#0000BB">FF_FONT0</FONT><FONT color="#007700">
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);
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<BR>
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<BR></FONT><FONT color="#FF8000">
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// Use the short name of the month together with a 2 digit year
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<BR>// on the month scale
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<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">scale</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">
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month</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">
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SetStyle</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
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MONTHSTYLE_SHORTNAMEYEAR2</FONT><FONT color="#007700">);
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<BR>
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<BR></FONT><FONT color="#FF8000">
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// Format the bar for the first activity
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<BR>// ($row,$title,$startdate,$enddate)
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<BR></FONT><FONT color="#0000BB">$activity </FONT><FONT color="#007700">
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= new </FONT><FONT color="#0000BB">GanttBar</FONT><FONT color="#007700">
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(</FONT><FONT color="#0000BB">0</FONT><FONT color="#007700">,</FONT><FONT
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color="#DD0000">"Project"</FONT><FONT color="#007700">,</FONT><FONT color="#DD0000">
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"2001-12-21"</FONT><FONT color="#007700">,</FONT><FONT color="#DD0000">
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"2002-01-20"</FONT><FONT color="#007700">);
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<BR>
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<BR></FONT><FONT color="#FF8000">
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// Yellow diagonal line pattern on a red background
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<BR></FONT><FONT color="#0000BB">$activity</FONT><FONT color="#007700">
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-></FONT><FONT color="#0000BB">SetPattern</FONT><FONT color="#007700">(</FONT><FONT
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color="#0000BB">BAND_RDIAG</FONT><FONT color="#007700">,</FONT><FONT color="#DD0000">
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"yellow"</FONT><FONT color="#007700">);
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<BR></FONT><FONT color="#0000BB">$activity</FONT><FONT color="#007700">
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-></FONT><FONT color="#0000BB">SetFillColor</FONT><FONT color="#007700">
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(</FONT><FONT color="#DD0000">"red"</FONT><FONT color="#007700">);
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<BR>
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<BR></FONT><FONT color="#FF8000">// Finally add the bar to the graph
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<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">Add</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
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$activity</FONT><FONT color="#007700">);
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<BR>
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<BR></FONT><FONT color="#FF8000">// ... and display it
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<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">Stroke</FONT><FONT color="#007700">();
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<BR></FONT><FONT color="#0000BB">?>
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<BR></FONT></FONT></CODE></DIV> The resulting image is shown in Figure
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148 below.<DIV class="example">
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<BR> <A href="exframes/frame_ganttex01.html" target="blank"><IMG border="0"
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HEIGHT="152" src="img/img/img/img/img/img/ganttex01.png" WIDTH="486"></A>
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<BR><B>Figure 148:</B> Making the Gantt chart a little bit more
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interesting with title and more colors. <A href="exframes/frame_ganttex01.html"
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target="blank">[src]</A>
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<P></P>
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</DIV></P>
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<P> From the above example you might note a few things</P>
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<UL>
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<LI> The margins adjust automatically to the added title and subtitle</LI>
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<LI> The height of the scale headers adjust automatically when you
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change the font.</LI>
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<LI> You have great flexibility in choosing what format the scale labels
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will have. If you for example wanted the full 4 digit year in the month
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header all you have to change is use the constant
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MONTHSTYLE_SHORTNAMEYEAR2 in the code above to
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MONTHSTYLE_SHORTNAMEYEAR4</LI>
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<LI> You have full freedom of manipulating headers in terms of font,
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color, background and size.</LI>
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</UL>
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<P> To show that this is really simple let's show the full year in the
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month, and set the header style to be white text on a dark blue
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background by adding the lines<DIV class="phpscript"><CODE><FONT color="#000000">
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<FONT color="#0000BB"> </FONT><FONT color="#FF8000">
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// Use the short name of the month together with a 4 digit year
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<BR>// on the month scale
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<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">scale</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">
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month</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">
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SetStyle</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
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MONTHSTYLE_SHORTNAMEYEAR4</FONT><FONT color="#007700">);
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<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">scale</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">
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month</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">
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SetTextColor</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
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"white"</FONT><FONT color="#007700">);
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<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-></FONT><FONT
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color="#0000BB">scale</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">
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month</FONT><FONT color="#007700">-></FONT><FONT color="#0000BB">
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SetBackgroundColor</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
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"blue"</FONT><FONT color="#007700">);</FONT><FONT color="#0000BB"></FONT>
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</FONT></CODE></DIV></P>
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<P>to the code above. The resulting image is shown in Figure 149<DIV class="example">
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<BR> <A href="exframes/frame_ganttex02.html" target="blank"><IMG border="0"
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HEIGHT="112" src="img/img/img/img/img/img/ganttex02.png" WIDTH="381"></A>
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<BR><B>Figure 149:</B> Enhancing the scale headers. <A href="exframes/frame_ganttex02.html"
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target="blank">[src]</A>
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<P></P>
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</DIV></P>
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<P></P>
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<HR NOSHADE>
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<A HREF="toc.html">Contents</A>
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<A HREF="92CapabilitiesinJpGraphGanttmodule.html">Previous</A>
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<A HREF="94ThestructureofaGanttchart.html">Next</A>
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