ch14s17.html
8.93 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Adding arbitrary texts to the graph</title><link rel="stylesheet" type="text/css" href="manual.css"><meta name="generator" content="DocBook XSL Stylesheets V1.76.0"><link rel="home" href="index.html" title="JpGraph Manual"><link rel="up" href="ch14.html" title="Chapter 14. Common features for all Cartesian (x,y) graph types"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Adding arbitrary texts to the graph</th></tr><tr><td width="20%" align="left"> </td><th width="60%" align="center">Chapter 14. Common features for all Cartesian (x,y) graph types</th><td width="20%" align="right"> </td></tr></table><hr></div><div class="sect1" title="Adding arbitrary texts to the graph"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="sec.adding-texts-to-graphs"></a>Adding arbitrary texts to the graph</h2></div></div></div>
<p>In much the same was as icon images can be added to the plot so can arbitrary text
strings be added. This is done by creating an or several instances of the Text class
(one per string that is needed). This feature is typically used to add
clarifications or other information related to the actual graph.</p>
<p>These text instances are then added to the graph via the normal
<code class="code">Graph::Add()</code> method.</p>
<p>The position of the text in the image/graph can be given as either absolute
pixels, fractions of the width/height of the graph or as scale values according to
the specified (or automatically determined) scale.</p>
<p>To show some ways of positioning the text we use a very simple bar graph not to
distract from the text. We first just add a single text line with most of the
settings there default value. We do this by adding te following lines</p>
<p>
</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
</pre></td><td class="hl-main" valign="top"><pre><span class="hl-inlinetags"><?php</span><span class="hl-code">
</span><span class="hl-comment">//</span><span class="hl-comment"> Create an instance of the Text class and set the string at the same time</span><span class="hl-comment"></span><span class="hl-code">
</span><span class="hl-var">$txt</span><span class="hl-code"> = </span><span class="hl-reserved">new</span><span class="hl-code"> </span><span class="hl-identifier">Text</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">This is a text</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-comment">//</span><span class="hl-comment"> Position the string at absolute pixels (0,20).</span><span class="hl-comment"></span><span class="hl-code">
</span><span class="hl-comment">//</span><span class="hl-comment"> ( (0,0) is the upper left corner )</span><span class="hl-comment"></span><span class="hl-code">
</span><span class="hl-var">$txt</span><span class="hl-code">-></span><span class="hl-identifier">SetPos</span><span class="hl-brackets">(</span><span class="hl-number">0</span><span class="hl-code">, </span><span class="hl-number">20</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-comment">//</span><span class="hl-comment"> Set color and fonr for the text</span><span class="hl-comment"></span><span class="hl-code">
</span><span class="hl-var">$txt</span><span class="hl-code">-></span><span class="hl-identifier">SetColor</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">red</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-var">$txt</span><span class="hl-code">-></span><span class="hl-identifier">SetFont</span><span class="hl-brackets">(</span><span class="hl-identifier">FF_FONT2</span><span class="hl-code">,</span><span class="hl-identifier">FS_BOLD</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-comment">//</span><span class="hl-comment"> ... and add the text to the graph</span><span class="hl-comment"></span><span class="hl-code">
</span><span class="hl-var">$graph</span><span class="hl-code">-></span><span class="hl-identifier">AddText</span><span class="hl-brackets">(</span><span class="hl-var">$txt</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-inlinetags">?></span></pre></td></tr></table></div><p>
</p>
<p>Teh resulting graph can be seen in <a class="xref" href="ch14s17.html#fig.example25" title="Figure 14.96. Adding a text object to a graph (example25.php)">Figure 14.96. Adding a text object to a graph <code class="uri"><a class="uri" href="example_src/example25.html" target="_top">(<code class="filename">example25.php</code>)</a></code> </a></p>
<p>
</p><div class="figure"><a name="fig.example25"></a><p class="title"><b>Figure 14.96. Adding a text object to a graph <code class="uri"><a class="uri" href="example_src/example25.html" target="_top">(<code class="filename">example25.php</code>)</a></code> </b></p><div class="figure-contents"> <span class="inlinemediaobject"><img src="images/example25.png" alt="Adding a text object to a graph (example25.php)"></span> </div></div><p><br class="figure-break">
</p>
<p>Let's make the text stand out a bit more by having a background color, framing the
text box and adding a drop shadow by using the method <code class="code">Text::SetBox()</code>
The resulting graph can be seen in <a class="xref" href="ch14s17.html#fig.example25.1" title="Figure 14.97. Making the text stand out a bit more by adding a background color and frame (example25.1.php)">Figure 14.97. Making the text stand out a bit more by adding a background color and frame <code class="uri"><a class="uri" href="example_src/example25.1.html" target="_top">(<code class="filename">example25.1.php</code>)</a></code> </a></p>
<p>
</p><div class="figure"><a name="fig.example25.1"></a><p class="title"><b>Figure 14.97. Making the text stand out a bit more by adding a background color and frame <code class="uri"><a class="uri" href="example_src/example25.1.html" target="_top">(<code class="filename">example25.1.php</code>)</a></code> </b></p><div class="figure-contents"> <span class="inlinemediaobject"><img src="images/example25.1.png" alt="Making the text stand out a bit more by adding a background color and frame (example25.1.php)"></span> </div></div><p><br class="figure-break">
</p>
<p>In order to use a text with several lines each line needs to be separated by a
newline ("\n'"character). The default paragraph alignment is left edge but as was
discussed in ?? paragraph alignment can be adjusted. </p>
<p>In our final example we a text with several line are place in the middle of the
plot area.</p>
<p>
</p><div class="figure"><a name="fig.example25.2"></a><p class="title"><b>Figure 14.98. Adding a text object with multiple rows of text. Paragraph alignment is set to "center" <code class="uri"><a class="uri" href="example_src/example25.2.html" target="_top">(<code class="filename">example25.2.php</code>)</a></code> </b></p><div class="figure-contents"> <span class="inlinemediaobject"><img src="images/example25.2.png" alt='Adding a text object with multiple rows of text. Paragraph alignment is set to "center" (example25.2.php)'></span> </div></div><p><br class="figure-break">
</p>
<div class="tip" title="Tip" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Tip</h3>
<p>To set the position of the text using scale positions instead use the
method</p>
<p>
</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
<p>Text::SetScalePos($aX,$aY)</p>
</li></ul></div><p>
</p>
</div>
</div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"> </td><td width="20%" align="center"><a accesskey="u" href="ch14.html">Up</a></td><td width="40%" align="right"> </td></tr><tr><td width="40%" align="left" valign="top"> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> </td></tr></table></div></body></html>