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
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head><style type="text/css">
pre {background-color: #e0e0e0}
</style>
<link rel="STYLESHEET" href="pychart.css" type='text/css' />
<link rel="first" href="pychart.html" title='PyChart' />
<link rel='index' href='genindex.html' title='Index' />
<link rel='last' href='about.html' title='About this document...' />
<link rel='help' href='about.html' title='About this document...' />
<link rel="next" href="module-chart-data.html" />
<link rel="prev" href="module-chart-object.html" />
<link rel="parent" href="pychart.html" />
<link rel="next" href="module-chart-data.html" />
<meta name='aesop' content='information' />
<title>4 Unit of length and the coordinate System</title>
</head>
<body>
<DIV CLASS="navigation">
<div id='top-navigation-panel' xml:id='top-navigation-panel'>
<table align="center" width="100%" cellpadding="0" cellspacing="2">
<tr>
<td class='online-navigation'><a rel="prev" title="3 Attributes"
href="module-chart-object.html"><img src='previous.png'
border='0' height='32' alt='Previous Page' width='32' /></A></td>
<td class='online-navigation'><a rel="parent" title="PyChart"
href="pychart.html"><img src='up.png'
border='0' height='32' alt='Up One Level' width='32' /></A></td>
<td class='online-navigation'><a rel="next" title="5 Reading CSV files"
href="module-chart-data.html"><img src='next.png'
border='0' height='32' alt='Next Page' width='32' /></A></td>
<td align="center" width="100%">PyChart</td>
<td class='online-navigation'><img src='blank.png'
border='0' height='32' alt='' width='32' /></td>
<td class='online-navigation'><img src='blank.png'
border='0' height='32' alt='' width='32' /></td>
<td class='online-navigation'><a rel="index" title="Index"
href="genindex.html"><img src='index.png'
border='0' height='32' alt='Index' width='32' /></A></td>
</tr></table>
<div class='online-navigation'>
<b class="navlabel">Previous:</b>
<a class="sectref" rel="prev" href="module-chart-object.html">3 Attributes</A>
<b class="navlabel">Up:</b>
<a class="sectref" rel="parent" href="pychart.html">PyChart</A>
<b class="navlabel">Next:</b>
<a class="sectref" rel="next" href="module-chart-data.html">5 Reading CSV files</A>
</div>
<hr /></div>
</DIV>
<!--End of Navigation Panel-->
<H1><A NAME="SECTION000400000000000000000"></A><A NAME="unit"></A><a id='l2h-5' xml:id='l2h-5'></a>
<BR>
4 Unit of length and the coordinate System
</H1>
<P>
<P>
In PyChart, the X axis grows to the right, and the Y axis grows up
(the same as PostScript, but different from X and Windows).
<P>
The length is measured in ``PostScript points'', which coincides with <span class="TeX">TeX</span>
points. Usually, one point is equal to 1/72 inch. Several variables and
functions are provided to manipulate lengths.
<P>
Chart magnification can be changed by setting
variable <code>theme.scale_factor</code>.
One can convert a sample data value to a canval coordinate by
calling two methods, <code>x_pos</code> and <code>y_pos</code> in <code>area.T</code> object.
<P>
<P>
<div class="seealso">
<p class="heading">See Also:</p>
See Section <A href="module-theme.html#module-theme">13.1</A> for the <tt class="module">theme</tt> module.
<P>
See Section <A href="module-area.html#module-area">6</A> for the <tt class="module">area</tt> mobule.
</div>
<P>
<DIV CLASS="navigation">
<div class='online-navigation'>
<p></p><hr />
<table align="center" width="100%" cellpadding="0" cellspacing="2">
<tr>
<td class='online-navigation'><a rel="prev" title="3 Attributes"
href="module-chart-object.html"><img src='previous.png'
border='0' height='32' alt='Previous Page' width='32' /></A></td>
<td class='online-navigation'><a rel="parent" title="PyChart"
href="pychart.html"><img src='up.png'
border='0' height='32' alt='Up One Level' width='32' /></A></td>
<td class='online-navigation'><a rel="next" title="5 Reading CSV files"
href="module-chart-data.html"><img src='next.png'
border='0' height='32' alt='Next Page' width='32' /></A></td>
<td align="center" width="100%">PyChart</td>
<td class='online-navigation'><img src='blank.png'
border='0' height='32' alt='' width='32' /></td>
<td class='online-navigation'><img src='blank.png'
border='0' height='32' alt='' width='32' /></td>
<td class='online-navigation'><a rel="index" title="Index"
href="genindex.html"><img src='index.png'
border='0' height='32' alt='Index' width='32' /></A></td>
</tr></table>
<div class='online-navigation'>
<b class="navlabel">Previous:</b>
<a class="sectref" rel="prev" href="module-chart-object.html">3 Attributes</A>
<b class="navlabel">Up:</b>
<a class="sectref" rel="parent" href="pychart.html">PyChart</A>
<b class="navlabel">Next:</b>
<a class="sectref" rel="next" href="module-chart-data.html">5 Reading CSV files</A>
</div>
</div>
<hr />
<span class="release-info">Documentation released on July 2, 2005.</span>
</DIV>
<!--End of Navigation Panel-->
</BODY>
</HTML>
|
