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newbie, two things unclear 
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banton
New pChart user
New pChart user

Joined: Wed Jan 11, 2012 3:26 am
Posts: 1
Post newbie, two things unclear
Hello,

pchart is great but still have to learn a lot. Would be great if you could help me answer the following two questions:
my first attempt at drawing a line chart is failing. I have roughly 300 data points I'd like to graph, yet the line is just totally straight.

Image

the data looks like this

Code:
array(480) { [0]=> string(7) "6084.89" [1]=> string(7) "6081.43" [2]=> string(7) "6081.43" [3]=> string(7) "6077.99" [4]=> string(7) "6073.75" [5]=> string(7) "6071.47" [6]=> string(7) "6076.69" [7]=> string(7) "6074.46" [8]=> string(6) "6074.3" [9]=> string(7) "6077.87" [10]=> string(7) "6077.87" [11]=> string(7) "6085.47" [12]=> string(7) "6076.69" [13]=> string(6) "6077.6" [14]=> string(7) "6076.69" [15]=> string(7) "6076.69" [16]=> string(7) "6084.25" [17]=> string(7) "6085.38" [18]=> string(7) "6086.25" [19]=> string(7) "6083.47" [20]=> string(7) "6083.47" [21]=> string(7) "6090.83" [22]=> string(7) "6090.02" [23]=> string(7) "6090.46" [24]=> string(7) "6090.46" [25]=> string(7) "6092.32" [26]=> string(6) "6099.6" [27]=> string(7) "6097.74" [28]=> string(7) "6085.24" [29]=> string(7) "6103.51" [30]=> string(7) "6100.09" [31]=> string(7) "6100.09" [32]=> string(7) "6101.99" [33]=> string(7) "6101.99" [34]=> string(7) "6093.44" [35]=> string(7) "6103.51" [36]=> string(7) "6088.91" [37]=> string(7) "6092.72" [38]=> string(7) "6088.91" [39]=> string(7) "6088.62" [40]=> string(7) "6088.62" [41]=> string(7) "6100.09" [42]=> string(7) "6089.32" [43]=> string(7) "6100.09" [44]=> string(7) "6091.53" [45]=> string(7) "6100.09" [46]=> string(7) "6091.53" [47]=> string(7) "6090.15" [48]=> string(7) "6089.14" [49]=> string(7) "6089.78" [50]=> string(7) "6091.53" [51]=> string(7) "6088.65" etc


is the range between these values too large, ie the difference too small?

also, how do i adjust how many points are drawn on the X axis? does it downsample the amount of points automatically, or can i adjust that? is this related to the number of labels on the x-scale?

looking forward to hear from you,
thanks!

bernhard

code is based entirely on the drawLineChart.simple example.
Wed Jan 11, 2012 3:35 am
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mila76
Regular pChart user
Regular pChart user

Joined: Mon Dec 19, 2011 12:19 am
Posts: 14
Post Re: newbie, two things unclear
Please poste your code, with this i have a "good graph".
Maybe problem is YMargin
Code:
<?php   
/* CAT:Line chart */

/* pChart library inclusions */
include("../class/pData.class.php");
include("../class/pDraw.class.php");
include("../class/pImage.class.php");

/* Create and populate the pData object */
$MyData = new pData(); 
$MyData->addPoints(array(6084.89,6081.43,6081.43,6077.99,6073.75,6071.47),"Probe 1");
$MyData->setAxisName(0,"Temperatures");
$MyData->addPoints(array("Jan","Feb","Mar","Apr","May","Jun"),"Labels");
$MyData->setSerieDescription("Labels","Months");
$MyData->setAbscissa("Labels");


/* Create the pChart object */
$myPicture = new pImage(600,80,$MyData);

/* Turn of Antialiasing */
$myPicture->Antialias = FALSE;

/* Add a border to the picture */
$myPicture->drawRectangle(0,0,599,79,array("R"=>0,"G"=>0,"B"=>0));

/* Set the default font */
$myPicture->setFontProperties(array("FontName"=>"../fonts/pf_arma_five.ttf","FontSize"=>6));

/* Define the chart area */
$myPicture->setGraphArea(40,8,590,64);

/* Draw the scale */
$scaleSettings = array("XMargin"=>0,"GridR"=>200,"GridG"=>200,"GridB"=>200,"DrawSubTicks"=>TRUE,"CycleBackground"=>TRUE);
$myPicture->drawScale($scaleSettings);

/* Turn on Antialiasing */
$myPicture->Antialias = TRUE;

/* Draw the line chart */
$myPicture->drawLineChart();

/* Render the picture (choose the best way) */
$myPicture->autoOutput("pictures/example.drawLineChart.simple.png");
?>


Attachments:
ex.png
ex.png [ 3.8 KiB | Viewed 4450 times ]
Thu Jan 12, 2012 10:18 am
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