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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
<!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="clipping-canvas.html" />
<link rel="prev" href="drawing-graph-canvas.html" />
<link rel="parent" href="module-canvas.html" />
<link rel="next" href="clipping-canvas.html" />
<meta name='aesop' content='information' />
<title>21.3 Drawing other objects on canvas</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="21.2 Drawing plots on"
href="drawing-graph-canvas.html"><img src='previous.png'
border='0' height='32' alt='Previous Page' width='32' /></A></td>
<td class='online-navigation'><a rel="parent" title="21 canvas - Controlling"
href="module-canvas.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="21.4 Clipping"
href="clipping-canvas.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="drawing-graph-canvas.html">21.2 Drawing plots on</A>
<b class="navlabel">Up:</b>
<a class="sectref" rel="parent" href="module-canvas.html">21 canvas - Controlling</A>
<b class="navlabel">Next:</b>
<a class="sectref" rel="next" href="clipping-canvas.html">21.4 Clipping</A>
</div>
<hr /></div>
</DIV>
<!--End of Navigation Panel-->
<H2><A NAME="SECTION0002130000000000000000"></A><A NAME="drawing-canvas"></A><a id='l2h-356' xml:id='l2h-356'></a>
<BR>
21.3 Drawing other objects on canvas
</H2>
<P>
The objects of <code>canvas.T</code> class and its subclasses provides
several methods that can be invoked manually to draw variety of things
if you desire so. These methods take Postscript points
as the unit of X and Y
coordinates, as described in Section <A href="unit.html#unit">4</A>.
(These methods obey the scaling-factor specifications).
<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
<td><nobr><b><tt id='l2h-357' xml:id='l2h-357' class="method">line</tt></b>(</nobr></td>
<td><var>linestyle, x1, y1, x2, y2</var>)</td></tr></table></dt>
<dd>
<P>
<div class="verbatim"><pre>
# draw a line segment from (10,20) to (100, 200)
can.line(<a href="module-line-style.html">line_style.</a>blackdash1, 10, 20, 100, 200)
</pre></div>
<a id='l2h-365' xml:id='l2h-365'></a>
</dl>
<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
<td><nobr><b><tt id='l2h-358' xml:id='l2h-358' class="method">polygon</tt></b>(</nobr></td>
<td><var>linestyle, fillstyle, [(x1,y1), ..., (xn, yn)], shadow = None</var>)</td></tr></table></dt>
<dd>
<P>
Draw a polygon <var>points</var>, with <var>linestyle</var>
( see Section <A href="module-line-style.html#module-line-style">14</A>), and fill with
<var>fillstyle</var>
(see Section <A href="module-fill-style.html#module-fill-style">16</A>). Parameter <var>points</var>
is a list of
coordinates, e.g., ((10,10), (15,5), (20,8)).
Value of <var>linestyle</var> can be None, in which case
no line is drawn on the perimeter. Value of <var>fillstyle</var> can also be
None, in which the internal of the polygon are left undrawn.
Parameter <var>shadow</var> is either None or tuple (<var>xdelta, ydelta, shadowstyle</var>). If non-None, a shadow of <var>shadowstyle</var> (see Section <A href="module-fill-style.html#module-fill-style">16</A>) is drawn beneath the polygon at the offset (<var>xdelta, ydelta</var>).
<P>
<div class="verbatim"><pre>
can.polygon(<a href="module-line-style.html">line_style.</a>default, <a href="module-fill-style.html">fill_style.</a>default,
[(10, 20), (100, 200), (300,300)])
</pre></div>
</dl>
<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
<td><nobr><b><tt id='l2h-359' xml:id='l2h-359' class="method">rectangle</tt></b>(</nobr></td>
<td><var>linestyle, fillstyle, x1, y1, x2, y2, shadow=None</var>)</td></tr></table></dt>
<dd>
<P>
Parameter <var>shadow</var> is either None or tuple (<var>xdelta, ydelta, shadowstyle</var>). If non-None, a shadow of <var>shadowstyle</var> ( see Section <A href="module-fill-style.html#module-fill-style">16</A>) is drawn beneath the polygon at the offset (<var>xdelta, ydelta</var>).
<P>
<div class="verbatim"><pre>
can.rectangle(<a href="module-line-style.html">line_style.</a>default, <a href="module-fill-style.html">fill_style.</a>default, 10, 20, 300, 300)
</pre></div>
</dl>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
<td><nobr><b><tt id='l2h-360' xml:id='l2h-360' class="method">ellipsis</tt></b>(</nobr></td>
<td><var>linestyle, fillstyle, x, y, radius, y_elongation=1, start=0, end=360, shadow=None</var>)</td></tr></table></dt>
<dd>
<P>
The start and end angles are specified in degrees; i.e., between 0 and
360.
Parameter <var>shadow</var> is either None or tuple (<var>xdelta, ydelta, shadowstyle</var>). If non-None, a shadow of <var>shadowstyle</var> ( see Section <A href="module-fill-style.html#module-fill-style">16</A>) is drawn beneath the polygon at the offset (<var>xdelta, ydelta</var>).
<P>
</dl>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
<td><nobr><b><tt id='l2h-361' xml:id='l2h-361' class="method">round_rectangle</tt></b>(</nobr></td>
<td><var>linestyle, fillstyle, x1, y2, x2, y2, radius, shadow=None</var>)</td></tr></table></dt>
<dd>
<a id='l2h-366' xml:id='l2h-366'></a>
Draw a rectangle with rounded four corners. Parameter <var>radius</var> specifies the radius of each corner.
<P>
Parameter <var>shadow</var> is either None or tuple (<var>xdelta, ydelta, shadowstyle</var>). If non-None, a shadow of <var>shadowstyle</var> ( see Section <A href="module-fill-style.html#module-fill-style">16</A>) is drawn beneath the polygon at the offset (<var>xdelta, ydelta</var>).
</dl>
<P>
<a id='l2h-367' xml:id='l2h-367'></a>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
<td><nobr><b><tt id='l2h-362' xml:id='l2h-362' class="method">curve</tt></b>(</nobr></td>
<td><var>linestyle, [(x1,y2), ..., (xn, yn)]</var>)</td></tr></table></dt>
<dd>
Draw a Bezier curve.
</dl>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
<td><nobr><b><tt id='l2h-363' xml:id='l2h-363' class="method">show</tt></b>(</nobr></td>
<td><var>x, y, text</var>)</td></tr></table></dt>
<dd>
Draw a <var>text</var> on the canvas at location (<var>x, y</var>).
Parameter <var>text</var> supports font manipulation, as
described in See Section <A href="module-font.html#module-font">17</A>.
</dl>
<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
<td><nobr><b><tt id='l2h-364' xml:id='l2h-364' class="method">verbatim</tt></b>(</nobr></td>
<td><var>string</var>)</td></tr></table></dt>
<dd>
This procedure outputs an arbitrary <var>string</var> to the output file.
<a id='l2h-368' xml:id='l2h-368'></a>
</dl>
<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="21.2 Drawing plots on"
href="drawing-graph-canvas.html"><img src='previous.png'
border='0' height='32' alt='Previous Page' width='32' /></A></td>
<td class='online-navigation'><a rel="parent" title="21 canvas - Controlling"
href="module-canvas.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="21.4 Clipping"
href="clipping-canvas.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="drawing-graph-canvas.html">21.2 Drawing plots on</A>
<b class="navlabel">Up:</b>
<a class="sectref" rel="parent" href="module-canvas.html">21 canvas - Controlling</A>
<b class="navlabel">Next:</b>
<a class="sectref" rel="next" href="clipping-canvas.html">21.4 Clipping</A>
</div>
</div>
<hr />
<span class="release-info">Documentation released on July 2, 2005.</span>
</DIV>
<!--End of Navigation Panel-->
</BODY>
</HTML>
|
